/* ===================================
   TRIAGE - Student Assignment Manager
   Modern Glassmorphism Design
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Light Mode */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.3);
    
    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    
    /* Status Colors */
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    
    /* Priority Colors */
    --priority-low: #10b981;
    --priority-medium: #f59e0b;
    --priority-high: #f97316;
    --priority-urgent: #ef4444;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(255, 255, 255, 0.5);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --blur-amount: 20px;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Sidebar */
    --sidebar-width: 280px;
    
    /* Z-Index */
    --z-sidebar: 100;
    --z-header: 90;
    --z-modal: 1000;
    --z-toast: 1100;
    --z-confetti: 1200;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: rgba(100, 116, 139, 0.3);
    
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-bg-dark: rgba(15, 23, 42, 0.8);
    --glass-border: rgba(100, 116, 139, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ===================================
   RESET & BASE
   =================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   BACKGROUND ORBS
   =================================== */

.bg-orbs {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #ec4899, #f43f5e);
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, #14b8a6, #06b6d4);
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

.orb-4 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, #f59e0b, #eab308);
    bottom: 20%;
    right: 20%;
    animation-delay: -15s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

[data-theme="dark"] .orb {
    opacity: 0.3;
}

/* ===================================
   GLASSMORPHISM
   =================================== */

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.glass-dark {
    background: var(--glass-bg-dark);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* ===================================
   TYPOGRAPHY
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary-hover);
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.45);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    position: relative;
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    position: relative;
}

.btn-ghost::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--accent-primary);
}

.btn-ghost:hover::after {
    width: 80%;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-icon-only {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-icon-only:hover {
    background: var(--bg-secondary);
    color: var(--accent-primary);
    transform: scale(1.08);
}

.btn-icon-only:active {
    transform: scale(0.95);
}

.btn-icon-only svg {
    width: 20px;
    height: 20px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===================================
   FORM ELEMENTS
   =================================== */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    flex: 1;
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
input[type="date"],
input[type="time"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

input:hover:not(:focus),
select:hover:not(:focus),
textarea:hover:not(:focus) {
    background: var(--bg-tertiary);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-tertiary);
    transition: opacity var(--transition-base);
}

input:focus::placeholder,
textarea:focus::placeholder {
    opacity: 0.5;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
    padding-right: 40px;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.color-input {
    width: 60px;
    height: 40px;
    padding: 4px;
    cursor: pointer;
}

.emoji-input {
    text-align: center;
    font-size: var(--font-size-xl);
}

/* Toggle Switch */
.toggle {
    appearance: none;
    width: 52px;
    height: 28px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    flex-shrink: 0;
}

.toggle::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.toggle:hover::before {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toggle:checked {
    background: var(--accent-gradient);
}

.toggle:checked::before {
    transform: translateX(24px);
}

.toggle-setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

/* Filter Selects */
.filter-select {
    min-width: 150px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    background: var(--glass-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
}

.filter-select:hover {
    border-color: var(--accent-primary);
}

.filter-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* ===================================
   AUTH SCREEN
   =================================== */

#auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-card {
    padding: var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(255, 255, 255, 0.9) 100%);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .auth-card {
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(30, 41, 59, 0.95) 100%);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    margin-top: var(--spacing-sm);
    color: var(--text-tertiary);
}

.auth-form {
    display: none;
    flex-direction: column;
    gap: var(--spacing-md);
}

.auth-form.active {
    display: flex;
}

.auth-form h2 {
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.auth-switch {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.auth-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border-radius: var(--radius-full);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 1.25rem;
}

.error-message {
    color: var(--danger);
    font-size: var(--font-size-sm);
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--danger-bg);
    border-radius: var(--radius-lg);
    display: none;
    border: 1px solid rgba(239, 68, 68, 0.3);
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.error-message.show {
    display: block;
}

/* ===================================
   APP LAYOUT
   =================================== */

#app-screen {
    display: flex;
    min-height: 100vh;
}

/* ===================================
   SIDEBAR
   =================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    z-index: var(--z-sidebar);
    overflow-y: auto;
    transition: transform var(--transition-slow);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.sidebar-header .logo {
    justify-content: flex-start;
}

.sidebar-header .logo-icon {
    font-size: 1.75rem;
}

.sidebar-header .logo h1 {
    font-size: var(--font-size-xl);
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.user-profile:hover {
    background: var(--bg-tertiary);
    transform: translateX(4px);
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 2px;
}

.user-level {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.level-badge {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 2px 8px;
    background: var(--accent-gradient);
    color: white;
    border-radius: var(--radius-full);
}

.xp-text {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* XP Progress */
.xp-progress {
    margin-bottom: var(--spacing-lg);
}

.xp-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.xp-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.xp-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    100% { left: 100%; }
}

.xp-label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
    display: block;
}

/* Navigation */
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--accent-gradient);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: height var(--transition-base);
}

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

.nav-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding-left: calc(var(--spacing-md) + 4px);
}

.nav-item:hover::before {
    height: 60%;
}

.nav-item:hover svg {
    transform: scale(1.1);
}

.nav-item.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
    padding-left: var(--spacing-md);
}

.nav-item.active::before {
    display: none;
}

.nav-item.active:hover {
    padding-left: var(--spacing-md);
}

.nav-badge {
    margin-left: auto;
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 2px 8px;
    background: var(--danger);
    color: white;
    border-radius: var(--radius-full);
}

.nav-item.active .nav-badge {
    background: rgba(255, 255, 255, 0.3);
}

/* Sidebar Section */
.sidebar-section {
    margin-bottom: var(--spacing-lg);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.section-header h4 {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

/* Classes List */
.classes-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.class-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-base);
}

.class-item:hover {
    background: var(--bg-secondary);
}

.class-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.class-item span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.class-item .class-count {
    margin-left: auto;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Streak Widget */
.streak-widget {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    margin-top: auto;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.1) 0%, rgba(234, 179, 8, 0.1) 100%);
    border: 1px solid rgba(249, 115, 22, 0.2);
    transition: all var(--transition-base);
}

.streak-widget:hover {
    transform: scale(1.02);
    border-color: rgba(249, 115, 22, 0.4);
}

.streak-icon {
    font-size: 2rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.streak-info {
    display: flex;
    flex-direction: column;
}

.streak-count {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1;
}

.streak-label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Sidebar Footer */
.sidebar-footer {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* Theme Toggle Icons */
#theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] #theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] #theme-toggle .icon-moon {
    display: block;
}

/* ===================================
   MAIN CONTENT
   =================================== */

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.main-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-lg);
    position: sticky;
    top: var(--spacing-lg);
    z-index: var(--z-header);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.header-title {
    flex: 1;
}

.header-title h2 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-title p {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===================================
   VIEWS
   =================================== */

.views-container {
    flex: 1;
}

.view {
    display: none;
    animation: fadeIn var(--transition-base);
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===================================
   DASHBOARD VIEW
   =================================== */

.dashboard-section {
    margin-bottom: var(--spacing-xl);
}

.dashboard-section .section-header {
    margin-bottom: var(--spacing-md);
}

.dashboard-section .section-header h3 {
    font-size: var(--font-size-lg);
}

.view-all {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Priority Card */
.priority-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.priority-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: var(--accent-gradient);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.priority-card::after {
    content: '';
    position: absolute;
    right: -50px;
    top: -50px;
    width: 150px;
    height: 150px;
    background: var(--accent-gradient);
    opacity: 0.05;
    border-radius: 50%;
}

.priority-card.has-assignment {
    cursor: pointer;
    transition: transform var(--transition-base);
}

.priority-card.has-assignment:hover {
    transform: translateY(-2px);
}

.priority-assignment-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.priority-assignment-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.priority-assignment-class {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}

.priority-assignment-due {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.due-countdown {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--accent-primary);
}

.due-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: var(--accent-gradient);
    opacity: 0.03;
    border-radius: 50%;
    transform: translate(30%, -30%);
    transition: all var(--transition-slow);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.stat-card:hover::after {
    opacity: 0.08;
    transform: translate(20%, -20%) scale(1.2);
}

.stat-icon {
    font-size: 2rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* ===================================
   ASSIGNMENTS LIST
   =================================== */

.assignments-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.assignments-list.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.assignment-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.assignment-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.assignment-card:hover {
    transform: translateY(-3px) translateX(2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-primary);
}

.assignment-card:hover::before {
    opacity: 1;
}

.assignment-checkbox {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    margin-top: 2px;
}

.assignment-checkbox:hover {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    transform: scale(1.1);
}

.assignment-checkbox.checked {
    background: var(--success);
    border-color: var(--success);
    animation: checkPop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes checkPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.assignment-checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 700;
}

.assignment-content {
    flex: 1;
    min-width: 0;
}

.assignment-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.assignment-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    word-break: break-word;
}

.assignment-card.completed .assignment-title {
    text-decoration: line-through;
    color: var(--text-tertiary);
}

.assignment-priority {
    flex-shrink: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.assignment-priority.low { background: var(--priority-low); }
.assignment-priority.medium { background: var(--priority-medium); }
.assignment-priority.high { background: var(--priority-high); }
.assignment-priority.urgent { background: var(--priority-urgent); animation: pulse 1s ease-in-out infinite; }

.assignment-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.assignment-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.assignment-class-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
}

.assignment-due {
    font-weight: 500;
}

.assignment-due.overdue {
    color: var(--danger);
}

.assignment-due.due-soon {
    color: var(--warning);
}

.assignment-due.due-today {
    color: var(--danger);
    font-weight: 600;
}

.assignment-type {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    text-transform: capitalize;
}

.assignment-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.assignment-card:hover .assignment-actions {
    opacity: 1;
}

.assignment-actions .btn-icon-only {
    width: 32px;
    height: 32px;
}

.assignment-actions .btn-icon-only svg {
    width: 16px;
    height: 16px;
}

/* Subtasks preview */
.assignment-subtasks {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.subtasks-progress {
    width: 60px;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.subtasks-progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: var(--radius-full);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    color: var(--text-tertiary);
    font-size: var(--font-size-base);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.02) 0%, rgba(139, 92, 246, 0.02) 100%);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.empty-state:hover {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
}

/* ===================================
   FILTERS BAR
   =================================== */

.filters-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.filter-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.view-toggle {
    display: flex;
    gap: 2px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.view-btn:hover {
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.view-btn.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

[data-theme="dark"] .view-btn.active {
    background: var(--accent-gradient);
}

.view-btn svg {
    width: 18px;
    height: 18px;
}

/* ===================================
   CALENDAR VIEW
   =================================== */

.calendar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.calendar-header h3 {
    flex: 1;
    text-align: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.calendar-grid {
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.calendar-weekdays span {
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-tertiary);
    padding: var(--spacing-sm);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 80px;
    border: 2px solid transparent;
}

.calendar-day:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    transform: scale(1.02);
}

.calendar-day.other-month {
    opacity: 0.3;
}

.calendar-day.today {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.calendar-day.today:hover {
    background: var(--accent-gradient);
    transform: scale(1.05);
}

.day-number {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: 4px;
}

.day-assignments {
    display: flex;
    flex-direction: column;
    gap: 2px;
    width: 100%;
    overflow: hidden;
}

.day-assignment {
    font-size: 10px;
    padding: 2px 4px;
    border-radius: 4px;
    background: var(--bg-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.day-assignment.has-color {
    color: white;
}

.day-more {
    font-size: 10px;
    color: var(--text-tertiary);
    text-align: center;
}

/* ===================================
   CLASSES VIEW
   =================================== */

.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.class-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.class-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
    border-color: rgba(99, 102, 241, 0.3);
}

.class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.class-emoji {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.class-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.class-code {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.class-info {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.class-info p {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.class-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.class-stat {
    display: flex;
    flex-direction: column;
}

.class-stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.class-stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Add Class Card */
.add-class-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    border: 2px dashed var(--border-color);
    background: transparent;
    transition: all var(--transition-base);
}

.add-class-card svg {
    width: 48px;
    height: 48px;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.add-class-card span {
    color: var(--text-tertiary);
    font-weight: 500;
    transition: all var(--transition-base);
}

.add-class-card:hover {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    transform: translateY(-4px);
}

.add-class-card:hover svg {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.add-class-card:hover span {
    color: var(--accent-primary);
}

/* ===================================
   TIMER VIEW
   =================================== */

.timer-container {
    max-width: 600px;
    margin: 0 auto;
}

.timer-card {
    padding: var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(99, 102, 241, 0.03) 100%);
    border: 1px solid var(--glass-border);
}

.timer-mode-toggle {
    display: inline-flex;
    gap: 4px;
    background: var(--bg-secondary);
    padding: 6px;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-xl);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.timer-mode {
    padding: var(--spacing-sm) var(--spacing-xl);
    border: none;
    background: transparent;
    border-radius: var(--radius-full);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.timer-mode:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.03);
}

.timer-mode.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

[data-theme="dark"] .timer-mode.active {
    background: var(--accent-gradient);
}

.timer-display {
    position: relative;
    width: 250px;
    height: 250px;
    margin: 0 auto var(--spacing-xl);
}

.timer-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-ring-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.timer-ring-progress {
    fill: none;
    stroke: url(#timer-gradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.timer-time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3.5rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timer-assignment {
    margin-bottom: var(--spacing-xl);
}

.timer-assignment select {
    max-width: 300px;
    text-align: center;
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.timer-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
}

.timer-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timer-stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.timer-stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.timer-tips {
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.1);
}

.timer-tips h4 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.timer-tips ul {
    list-style: none;
}

.timer-tips li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.timer-tips li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ===================================
   STATS VIEW
   =================================== */

.stats-overview {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
}

.stat-card-lg {
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
}

.stat-card-lg h4 {
    margin-bottom: var(--spacing-lg);
}

.weekly-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 200px;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.chart-bar {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.chart-bar-fill {
    width: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    min-height: 4px;
    transition: height var(--transition-slow);
}

.chart-bar-label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.chart-bar-value {
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.stats-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ===================================
   ACHIEVEMENTS VIEW
   =================================== */

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.achievement-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.achievement-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.achievement-card.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

.achievement-card:not(.locked):hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
    border-color: var(--accent-primary);
}

.achievement-card:not(.locked):hover::before {
    opacity: 1;
}

.achievement-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    transition: transform var(--transition-base);
}

.achievement-card:not(.locked):hover .achievement-icon {
    transform: scale(1.15) rotate(5deg);
}

.achievement-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.achievement-desc {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.achievement-date {
    font-size: var(--font-size-xs);
    color: var(--accent-primary);
    margin-top: var(--spacing-sm);
}

/* ===================================
   MODALS
   =================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.open {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    border-radius: var(--radius-2xl);
    animation: modalIn var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.2);
}

.modal-content.modal-lg {
    max-width: 700px;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(30px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, transparent 100%);
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.modal-body {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-md);
}

/* Subtasks in Modal */
.subtasks-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.subtask-item input[type="text"] {
    flex: 1;
}

.subtask-item .btn-icon-only {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

/* Settings Sections */
.settings-section {
    margin-bottom: var(--spacing-lg);
}

.settings-section h4 {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

/* ===================================
   DETAIL MODAL
   =================================== */

.detail-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.detail-status {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.detail-status.todo {
    background: var(--info-bg);
    color: var(--info);
}

.detail-status.in_progress {
    background: var(--warning-bg);
    color: var(--warning);
}

.detail-status.completed {
    background: var(--success-bg);
    color: var(--success);
}

.detail-section {
    margin-bottom: var(--spacing-lg);
}

.detail-section h4 {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-item-label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.detail-item-value {
    font-weight: 500;
}

.detail-notes {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.detail-subtasks {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-subtask {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.detail-subtask-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.detail-subtask-checkbox.checked {
    background: var(--success);
    border-color: var(--success);
}

.detail-subtask-checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: 12px;
}

.detail-subtask.completed span {
    text-decoration: line-through;
    color: var(--text-tertiary);
}

.detail-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ===================================
   TOASTS
   =================================== */

#toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    animation: toastIn var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.out {
    animation: toastOut var(--transition-base) forwards;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px;
}

/* ===================================
   CONFETTI
   =================================== */

#confetti-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-confetti);
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    animation: confetti-fall 3s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

.mobile-only {
    display: none !important;
}

@media (max-width: 1024px) {
    .stats-overview {
        grid-template-columns: 1fr;
    }
    
    .stats-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }
    
    .mobile-only {
        display: flex !important;
    }
    
    .sidebar {
        transform: translateX(-100%);
        width: 100%;
        max-width: 320px;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .main-header {
        position: relative;
        top: 0;
    }
    
    .header-actions .btn span {
        display: none;
    }
    
    .header-actions .btn {
        padding: var(--spacing-sm);
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .filters-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        flex-direction: column;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .view-toggle {
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calendar-day {
        min-height: 60px;
    }
    
    .day-assignments {
        display: none;
    }
    
    .calendar-day.has-assignments::after {
        content: '';
        width: 6px;
        height: 6px;
        background: var(--accent-primary);
        border-radius: 50%;
        margin-top: 4px;
    }
    
    .timer-display {
        width: 200px;
        height: 200px;
    }
    
    .timer-time {
        font-size: 2.5rem;
    }
    
    .stats-sidebar {
        grid-template-columns: 1fr 1fr;
    }
    
    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-content {
        max-height: 85vh;
    }
    
    #toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
    
    .toast {
        max-width: none;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    .auth-card {
        padding: var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .classes-grid {
        grid-template-columns: 1fr;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .timer-controls {
        flex-direction: column;
    }
    
    .timer-controls .btn {
        width: 100%;
    }
    
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
    margin: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
    border: 2px solid transparent;
    background-clip: padding-box;
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

/* ===================================
   PRINT STYLES
   =================================== */

@media print {
    .bg-orbs,
    .sidebar,
    .main-header,
    .modal,
    #toast-container,
    #confetti-container {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .glass,
    .glass-dark {
        background: white;
        backdrop-filter: none;
        border: 1px solid #ddd;
        box-shadow: none;
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-accent { color: var(--accent-primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.bg-success { background: var(--success-bg); }
.bg-warning { background: var(--warning-bg); }
.bg-danger { background: var(--danger-bg); }

.hidden { display: none !important; }
.visible { display: block; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-secondary) 25%,
        var(--bg-tertiary) 50%,
        var(--bg-secondary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}