/* =====================================================
   ConcursaJá - Sistema de Design CSS
   Plataforma de Estudos para Concursos Públicos
   ===================================================== */

/* =====================================================
   1. CSS CUSTOM PROPERTIES (Variables)
   ===================================================== */
:root {
    /* Primary Colors */
    --color-primary: #4F46E5;
    --color-primary-light: #6366F1;
    --color-primary-dark: #4338CA;
    --color-primary-50: #EEF2FF;
    --color-primary-100: #E0E7FF;
    --color-primary-200: #C7D2FE;
    
    /* Secondary Colors */
    --color-secondary: #0EA5E9;
    --color-secondary-light: #38BDF8;
    --color-secondary-dark: #0284C7;
    
    /* Accent Colors */
    --color-accent: #F59E0B;
    --color-accent-light: #FBBF24;
    --color-accent-dark: #D97706;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-success-light: #34D399;
    --color-warning: #F59E0B;
    --color-warning-light: #FBBF24;
    --color-error: #EF4444;
    --color-error-light: #F87171;
    --color-info: #3B82F6;
    
    /* Category Colors */
    --color-blue: #3B82F6;
    --color-purple: #8B5CF6;
    --color-green: #10B981;
    --color-orange: #F97316;
    --color-red: #EF4444;
    --color-teal: #14B8A6;
    --color-indigo: #6366F1;
    --color-yellow: #EAB308;
    --color-cyan: #06B6D4;
    --color-pink: #EC4899;
    --color-lime: #84CC16;
    --color-amber: #F59E0B;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-dark: #111827;
    
    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #6B7280;
    --text-muted: #9CA3AF;
    --text-inverse: #FFFFFF;
    
    /* Border Colors */
    --border-light: #E5E7EB;
    --border-medium: #D1D5DB;
    --border-dark: #9CA3AF;
    
    /* Shadow System */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    --shadow-glow: 0 0 20px rgb(79 70 229 / 0.3);
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    --font-size-5xl: 3rem;       /* 48px */
    --font-size-6xl: 3.75rem;    /* 60px */
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    
    /* Spacing System (8px base) */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    --space-32: 8rem;     /* 128px */
    
    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.25rem;    /* 4px */
    --radius-md: 0.375rem;   /* 6px */
    --radius-lg: 0.5rem;     /* 8px */
    --radius-xl: 0.75rem;    /* 12px */
    --radius-2xl: 1rem;      /* 16px */
    --radius-3xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 500ms ease;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1400px;
    
    /* Header Height */
    --header-height: 72px;
}

/* =====================================================
   2. DARK MODE VARIABLES
   ===================================================== */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --bg-dark: #020617;
    
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-tertiary: #94A3B8;
    --text-muted: #64748B;
    
    --border-light: #334155;
    --border-medium: #475569;
    --border-dark: #64748B;
    
    --color-gray-50: #1E293B;
    --color-gray-100: #334155;
    --color-gray-200: #475569;
    
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* =====================================================
   3. CSS RESET & BASE STYLES
   ===================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: var(--header-height);
}

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

/* Accessibility - Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

/* Selection */
::selection {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

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

/* Images */
img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Lists */
ul, ol {
    list-style: none;
}

/* Buttons */
button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: transparent;
}

/* Inputs */
input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

/* =====================================================
   4. TYPOGRAPHY
   ===================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--space-4);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =====================================================
   5. LAYOUT - CONTAINER
   ===================================================== */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-inline: auto;
    padding-inline: var(--space-4);
}

@media (min-width: 768px) {
    .container {
        padding-inline: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding-inline: var(--space-8);
    }
}

/* =====================================================
   6. HEADER & NAVIGATION
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.95);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header > .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.logo__icon {
    font-size: var(--font-size-2xl);
}

.logo__highlight {
    color: var(--color-primary);
}

/* Navigation */
.nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav__link {
    display: block;
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
    background: var(--color-primary-50);
}

[data-theme="dark"] .nav__link:hover,
[data-theme="dark"] .nav__link.active {
    background: rgba(79, 70, 229, 0.1);
}

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-primary);
    background: var(--color-primary-50);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.hamburger {
    position: relative;
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    top: 6px;
}

.menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Mobile Navigation */
@media (max-width: 1023px) {
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-light);
        padding: var(--space-4);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .nav__link {
        width: 100%;
        text-align: center;
        padding: var(--space-3) var(--space-4);
    }
    
    .menu-toggle {
        display: flex;
    }
}

/* =====================================================
   7. BUTTONS
   ===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-align: center;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Button Sizes */
.btn--sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
}

.btn--full {
    width: 100%;
}

/* Button Variants */
.btn--primary {
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    box-shadow: var(--shadow-md), 0 4px 14px 0 rgba(79, 70, 229, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 6px 20px 0 rgba(79, 70, 229, 0.4);
}

.btn--outline {
    color: var(--color-primary);
    background: transparent;
    border: 2px solid var(--color-primary);
}

.btn--outline:hover {
    color: var(--color-white);
    background: var(--color-primary);
}

.btn--success {
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
    box-shadow: var(--shadow-md), 0 4px 14px 0 rgba(16, 185, 129, 0.3);
}

.btn--success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 6px 20px 0 rgba(16, 185, 129, 0.4);
}

.btn--white {
    color: var(--color-primary);
    background: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn--white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--outline-white {
    color: var(--color-white);
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn--outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
}

/* =====================================================
   8. HERO SECTION
   ===================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--header-height) + var(--space-10));
    padding-bottom: var(--space-16);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, var(--color-primary-50) 0%, var(--bg-primary) 100%);
    z-index: -1;
}

[data-theme="dark"] .hero__bg {
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.1) 0%, var(--bg-primary) 100%);
}

.hero__shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(60px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.shape--1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.shape--2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-success) 100%);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

.shape--3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-orange) 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@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(20px, 10px) scale(1.02);
    }
}

.hero > .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero > .container {
        grid-template-columns: 1fr 1fr;
    }
}

/* Hero Content */
.hero__content {
    text-align: center;
}

@media (min-width: 1024px) {
    .hero__content {
        text-align: left;
    }
}

.hero__badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
}

.hero__title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-6);
    letter-spacing: var(--letter-spacing-tight);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 600px;
}

@media (min-width: 1024px) {
    .hero__subtitle {
        margin-inline: 0;
    }
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: center;
    margin-bottom: var(--space-10);
}

@media (min-width: 1024px) {
    .hero__cta {
        justify-content: flex-start;
    }
}

/* Hero Stats */
.hero__stats {
    display: flex;
    gap: var(--space-8);
    justify-content: center;
}

@media (min-width: 1024px) {
    .hero__stats {
        justify-content: flex-start;
    }
}

.stat {
    text-align: center;
}

.stat__number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-primary);
}

.stat__suffix {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.stat__label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: var(--font-weight-medium);
}

/* Hero Illustration */
.hero__illustration {
    position: relative;
    display: none;
    height: 500px;
}

@media (min-width: 1024px) {
    .hero__illustration {
        display: block;
    }
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: floatCard 6s ease-in-out infinite;
}

[data-theme="dark"] .floating-card {
    background: var(--bg-secondary);
}

.floating-card i {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
}

.floating-card span {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.floating-card--1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.floating-card--2 {
    top: 30%;
    right: 5%;
    animation-delay: -1.5s;
}

.floating-card--3 {
    bottom: 30%;
    left: 5%;
    animation-delay: -3s;
}

.floating-card--4 {
    bottom: 10%;
    right: 15%;
    animation-delay: -4.5s;
}

@keyframes floatCard {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* =====================================================
   9. SECTIONS - COMMON STYLES
   ===================================================== */
.section {
    padding: var(--space-16) 0;
}

@media (min-width: 768px) {
    .section {
        padding: var(--space-20) 0;
    }
}

.section__header {
    text-align: center;
    max-width: 700px;
    margin-inline: auto;
    margin-bottom: var(--space-12);
}

.section__badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section__title {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--space-4);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: 0;
}

.section__footer {
    text-align: center;
    margin-top: var(--space-10);
}

/* =====================================================
   10. MATERIAS SECTION
   ===================================================== */
.materias {
    background: var(--bg-secondary);
}

[data-theme="dark"] .materias {
    background: var(--bg-secondary);
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
}

.filter-tab {
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

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

.filter-tab.active {
    color: var(--color-white);
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* Materias Grid */
.materias__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

/* Materia Card */
.materia-card {
    position: relative;
    display: flex;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.materia-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.materia-card.hidden {
    display: none;
}

.materia-card__icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--card-color, var(--color-primary)) 0%, color-mix(in srgb, var(--card-color, var(--color-primary)) 70%, black) 100%);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: var(--font-size-xl);
}

.materia-card__content {
    flex: 1;
    min-width: 0;
}

.materia-card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-1);
}

.materia-card__description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
}

.materia-card__meta {
    display: flex;
    gap: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-3);
}

.materia-card__meta i {
    margin-right: var(--space-1);
}

.materia-card__progress {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar__fill {
    width: var(--progress, 0%);
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-text {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    white-space: nowrap;
}

.materia-card__link {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.materia-card:hover .materia-card__link {
    color: var(--color-white);
    background: var(--color-primary);
}

/* =====================================================
   11. VIDEOAULAS SECTION
   ===================================================== */
.videoaulas__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}

/* Video Card */
.video-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: all var(--transition-base);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.video-card__thumbnail {
    position: relative;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--color-gray-700) 0%, var(--color-gray-800) 100%);
    cursor: pointer;
}

.video-card__placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-4xl);
    transition: all var(--transition-fast);
}

.video-card:hover .video-card__placeholder {
    transform: scale(1.1);
    color: var(--color-primary-light);
}

.video-card__duration {
    position: absolute;
    bottom: var(--space-2);
    right: var(--space-2);
    padding: var(--space-1) var(--space-2);
    background: rgba(0, 0, 0, 0.8);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-sm);
}

.video-card__badge {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    padding: var(--space-1) var(--space-2);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-sm);
}

.video-card__badge--new {
    background: var(--color-success);
}

.video-card__content {
    padding: var(--space-4);
}

.video-card__category {
    display: inline-block;
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--space-2);
}

.video-card__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    line-height: var(--line-height-snug);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card__description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.video-card__views i {
    margin-right: var(--space-1);
}

/* =====================================================
   12. SIMULADOS SECTION
   ===================================================== */
.simulados {
    background: var(--bg-secondary);
}

.simulado-container {
    max-width: 800px;
    margin-inline: auto;
    padding: var(--space-8);
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

/* Simulado Selector */
.simulado-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

@media (max-width: 640px) {
    .simulado-selector {
        grid-template-columns: 1fr;
    }
}

.simulado-type {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-5);
    background: var(--bg-secondary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.simulado-type:hover {
    border-color: var(--color-primary);
}

.simulado-type.active {
    background: var(--color-primary-50);
    border-color: var(--color-primary);
}

[data-theme="dark"] .simulado-type.active {
    background: rgba(79, 70, 229, 0.2);
}

.simulado-type i {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
}

.simulado-type span {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.simulado-type small {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* Simulado Materias */
.simulado-materias {
    margin-bottom: var(--space-6);
}

.simulado-materias h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-3);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.checkbox-item:hover {
    background: var(--color-primary-50);
}

[data-theme="dark"] .checkbox-item:hover {
    background: rgba(79, 70, 229, 0.1);
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    position: relative;
    width: 20px;
    height: 20px;
    background: var(--bg-primary);
    border: 2px solid var(--border-medium);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.checkbox-item input:checked + .checkmark {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.checkmark::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 6px;
    width: 5px;
    height: 10px;
    border: solid var(--color-white);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.checkbox-item input:checked + .checkmark::after {
    opacity: 1;
}

.checkbox-item span:last-child {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Quiz Container */
.quiz-container {
    max-width: 800px;
    margin-inline: auto;
    padding: var(--space-8);
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.quiz-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.quiz-materia {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.quiz-progress {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family-mono);
}

.quiz-progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.quiz-question {
    margin-bottom: var(--space-6);
}

.question-text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    margin-bottom: 0;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.quiz-option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

[data-theme="dark"] .quiz-option:hover {
    background: rgba(79, 70, 229, 0.1);
}

.quiz-option.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

[data-theme="dark"] .quiz-option.selected {
    background: rgba(79, 70, 229, 0.2);
}

.quiz-option.correct {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
}

.quiz-option.wrong {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.1);
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-primary);
    border: 2px solid var(--border-medium);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.quiz-option.selected .option-letter {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.quiz-option.correct .option-letter {
    background: var(--color-success);
    border-color: var(--color-success);
    color: var(--color-white);
}

.quiz-option.wrong .option-letter {
    background: var(--color-error);
    border-color: var(--color-error);
    color: var(--color-white);
}

.option-text {
    flex: 1;
    line-height: var(--line-height-relaxed);
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
}

/* Results Container */
.results-container {
    max-width: 800px;
    margin-inline: auto;
    padding: var(--space-8);
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.results-header {
    margin-bottom: var(--space-8);
}

.results-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-orange) 100%);
    border-radius: var(--radius-full);
    font-size: var(--font-size-3xl);
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.results-icon.success {
    background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
}

.results-icon.warning {
    background: linear-gradient(135deg, var(--color-warning) 0%, var(--color-orange) 100%);
}

.results-icon.error {
    background: linear-gradient(135deg, var(--color-error) 0%, #DC2626 100%);
}

.results-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-2);
}

.results-subtitle {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

@media (max-width: 640px) {
    .results-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

.result-stat {
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
}

.result-stat__value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-1);
}

.result-stat__label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.results-chart {
    margin-bottom: var(--space-8);
    max-width: 300px;
    margin-inline: auto;
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* =====================================================
   13. DICAS SECTION
   ===================================================== */
.dicas__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-6);
}

@media (max-width: 400px) {
    .dicas__grid {
        grid-template-columns: 1fr;
    }
}

/* Dica Card */
.dica-card {
    position: relative;
    padding: var(--space-6);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.dica-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.dica-card__number {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-primary-100);
    line-height: 1;
}

[data-theme="dark"] .dica-card__number {
    color: rgba(79, 70, 229, 0.2);
}

.dica-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

.dica-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-3);
}

.dica-card__text {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.dica-card__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.dica-card__list li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.dica-card__list li::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: var(--color-success-light);
    color: var(--color-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
}

/* Pomodoro Widget */
.pomodoro-widget {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 280px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-dropdown);
    overflow: hidden;
    transition: all var(--transition-base);
}

.pomodoro-widget.minimized .pomodoro-body {
    display: none;
}

.pomodoro-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
}

.pomodoro-header h4 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin: 0;
}

.pomodoro-minimize {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: var(--color-white);
    transition: background var(--transition-fast);
}

.pomodoro-minimize:hover {
    background: rgba(255, 255, 255, 0.3);
}

.pomodoro-body {
    padding: var(--space-6);
    text-align: center;
}

.pomodoro-display {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family-mono);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.pomodoro-status {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-4);
}

.pomodoro-controls {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.pomodoro-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.pomodoro-btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.pomodoro-sessions {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.pomodoro-sessions span {
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

@media (max-width: 640px) {
    .pomodoro-widget {
        bottom: var(--space-4);
        right: var(--space-4);
        left: var(--space-4);
        width: auto;
    }
}

/* =====================================================
   14. PROGRESSO SECTION
   ===================================================== */
.progresso {
    background: var(--bg-secondary);
}

.progresso__grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

/* Stats Cards */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.stat-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.stat-card__icon--blue {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-blue);
}

.stat-card__icon--green {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.stat-card__icon--orange {
    background: rgba(249, 115, 22, 0.1);
    color: var(--color-orange);
}

.stat-card__icon--purple {
    background: rgba(139, 92, 246, 0.1);
    color: var(--color-purple);
}

.stat-card__value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

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

/* Charts Container */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.chart-card {
    padding: var(--space-6);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.chart-card__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.chart-card__title i {
    color: var(--color-primary);
}

.chart-wrapper {
    position: relative;
}

/* Activity Card */
.activity-card {
    padding: var(--space-6);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.activity-card__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.activity-card__title i {
    color: var(--color-primary);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.activity-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
}

.activity-item i {
    color: var(--color-primary);
}

.activity-item--empty {
    color: var(--text-tertiary);
}

.activity-item--empty i {
    color: var(--text-tertiary);
}

.activity-item__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-primary-50);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    flex-shrink: 0;
}

.activity-item__content {
    flex: 1;
    min-width: 0;
}

.activity-item__title {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

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

/* =====================================================
   15. CTA SECTION
   ===================================================== */
.cta-section {
    padding: var(--space-16) 0;
}

.cta-box {
    position: relative;
    padding: var(--space-12);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    text-align: center;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.cta-text {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-inline: auto;
}

.cta-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

.cta-decoration {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.cta-circle {
    position: absolute;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
}

.cta-circle--1 {
    width: 400px;
    height: 400px;
    top: -200px;
    right: -100px;
}

.cta-circle--2 {
    width: 300px;
    height: 300px;
    bottom: -150px;
    left: -50px;
}

.cta-circle--3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* =====================================================
   16. FOOTER
   ===================================================== */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-gray-900);
    color: var(--color-gray-300);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

@media (max-width: 768px) {
    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 480px) {
    .footer__grid {
        grid-template-columns: 1fr;
    }
}

.footer__brand .logo {
    margin-bottom: var(--space-4);
}

.footer__brand .logo__text {
    color: var(--color-white);
}

.footer__description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--space-5);
}

.footer__social {
    display: flex;
    gap: var(--space-3);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-gray-800);
    border-radius: var(--radius-lg);
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.footer__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__list a {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer__list a:hover {
    color: var(--color-white);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

@media (max-width: 640px) {
    .footer__bottom {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
    }
}

/* =====================================================
   17. BACK TO TOP BUTTON
   ===================================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

@media (max-width: 640px) {
    .back-to-top {
        bottom: calc(var(--space-4) + 160px);
        right: var(--space-4);
    }
}

/* =====================================================
   18. TOAST NOTIFICATIONS
   ===================================================== */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--space-4));
    right: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: var(--z-toast);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: slideIn var(--transition-base) ease-out;
}

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

.toast.hiding {
    animation: slideOut var(--transition-base) ease-in forwards;
}

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

.toast__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.toast--success .toast__icon {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.toast--error .toast__icon {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.toast--warning .toast__icon {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

.toast--info .toast__icon {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-info);
}

.toast__content {
    flex: 1;
    min-width: 0;
}

.toast__title {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

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

.toast__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    color: var(--text-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.toast__close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* =====================================================
   19. ANIMATIONS & TRANSITIONS
   ===================================================== */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   20. UTILITY CLASSES
   ===================================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

[hidden] {
    display: none !important;
}

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

/* =====================================================
   21. PRINT STYLES
   ===================================================== */
@media print {
    .header,
    .footer,
    .back-to-top,
    .pomodoro-widget,
    .toast-container {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
}