/* ═══════════════════════════════════════════════════════════════════════════
   EXPLIQUE-MOI CE CODE - Professional Stylesheet
   A distinctive, dark-mode first design with glassmorphism and subtle animations
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─────────────────────────────────────────────────────────────────────────────
   CSS Custom Properties (Design Tokens)
   ───────────────────────────────────────────────────────────────────────────── */
:root {
    /* Color Palette - Deep space theme */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-bg-elevated: #22222e;
    
    /* Glass effect backgrounds */
    --color-glass: rgba(255, 255, 255, 0.04);
    --color-glass-border: rgba(255, 255, 255, 0.1);
    --color-glass-hover: rgba(255, 255, 255, 0.08);
    
    /* Accent colors */
    --color-accent-primary: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #a78bfa;
    --color-accent-glow: rgba(99, 102, 241, 0.4);
    
    /* Semantic colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    /* Text colors - Improved contrast for WCAG AA */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #b8c5d6; /* Improved from #94a3b8 */
    --color-text-tertiary: #8899ab; /* Improved from #64748b */
    --color-text-muted: #6b7a8a; /* Improved from #475569 */
    
    /* Code editor colors */
    --color-code-bg: #0d0d12;
    --color-code-text: #e2e8f0;
    --color-code-line-numbers: #5a6a7a; /* Improved contrast */
    --color-code-cursor: #6366f1;
    
    /* AI brand colors */
    --color-chatgpt: #10a37f;
    --color-claude: #d97706;
    --color-gemini: #4285f4;
    --color-perplexity: #1fb8cd;
    
    /* Typography - Fluid with clamp() */
    --font-display: 'Outfit', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Fluid typography scale */
    --text-xs: clamp(0.7rem, 0.68rem + 0.1vw, 0.75rem);
    --text-sm: clamp(0.8rem, 0.77rem + 0.15vw, 0.875rem);
    --text-base: clamp(0.9rem, 0.87rem + 0.2vw, 1rem);
    --text-lg: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-xl: clamp(1.1rem, 1.05rem + 0.3vw, 1.25rem);
    --text-2xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
    --text-3xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
    --text-4xl: clamp(1.75rem, 1.55rem + 1vw, 2.25rem);
    
    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-index scale */
    --z-base: 0;
    --z-elevated: 10;
    --z-sticky: 100;
    --z-overlay: 200;
    --z-modal: 300;
    --z-toast: 400;
    
    /* Layout tokens for gradient orbs (responsive) */
    --orb-size-lg: clamp(300px, 40vw, 600px);
    --orb-size-md: clamp(250px, 35vw, 500px);
    --orb-size-sm: clamp(200px, 30vw, 400px);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Reset & Base Styles
   ───────────────────────────────────────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Accessibility: Skip link */
.skip-link {
    position: absolute;
    inset-block-start: -100%;
    inset-inline-start: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--color-accent-primary);
    color: white;
    border-radius: var(--radius-md);
    z-index: var(--z-modal);
    transition: inset-block-start var(--transition-fast);
}

.skip-link:focus {
    inset-block-start: var(--space-4);
}

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

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

/* ─────────────────────────────────────────────────────────────────────────────
   Background Effects
   ───────────────────────────────────────────────────────────────────────────── */
.background-effects {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: -1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
    /* GPU optimization */
    will-change: transform;
    transform: translate3d(0, 0, 0);
    contain: layout style;
}

.gradient-orb--1 {
    inline-size: var(--orb-size-lg);
    block-size: var(--orb-size-lg);
    background: radial-gradient(circle, var(--color-accent-primary) 0%, transparent 70%);
    inset-block-start: -10vh;
    inset-inline-end: -5vw;
    animation-delay: 0s;
}

.gradient-orb--2 {
    inline-size: var(--orb-size-md);
    block-size: var(--orb-size-md);
    background: radial-gradient(circle, var(--color-accent-secondary) 0%, transparent 70%);
    inset-block-end: -10vh;
    inset-inline-start: -5vw;
    animation-delay: -7s;
}

.gradient-orb--3 {
    inline-size: var(--orb-size-sm);
    block-size: var(--orb-size-sm);
    background: radial-gradient(circle, var(--color-accent-tertiary) 0%, transparent 70%);
    inset-block-start: 50%;
    inset-inline-start: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
    25% { transform: translate3d(30px, -30px, 0) scale(1.05); }
    50% { transform: translate3d(-20px, 20px, 0) scale(0.95); }
    75% { transform: translate3d(20px, 10px, 0) scale(1.02); }
}

.noise-overlay {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    mix-blend-mode: overlay;
}

/* ─────────────────────────────────────────────────────────────────────────────
   App Layout
   ───────────────────────────────────────────────────────────────────────────── */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.main {
    flex: 1;
    padding: var(--space-8) 0 var(--space-16);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Header
   ───────────────────────────────────────────────────────────────────────────── */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    padding: var(--space-4) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-glass-border);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.header__brand {
    display: flex;
    align-items: center;
}

/* Header Logo Image */
.header__logo {
    height: 45px;
    width: auto;
    object-fit: contain;
}

@media (min-width: 640px) {
    .header__logo {
        height: 55px;
    }
}

@media (min-width: 1024px) {
    .header__logo {
        height: 65px;
    }
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-1);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-full);
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-glass-hover);
}

.lang-btn--active {
    background: var(--color-accent-primary);
    color: white;
}

.lang-btn--active:hover {
    background: var(--color-accent-secondary);
    color: white;
}

.lang-btn__flag {
    font-size: var(--text-base);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Cards
   ───────────────────────────────────────────────────────────────────────────── */
.card {
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
    animation: fade-in-up 0.5s ease both;
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
    gap: var(--space-3);
}

.card__title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.card__icon {
    font-size: var(--text-xl);
}

/* Info card */
.card--info {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.instructions-list {
    list-style: none;
    counter-reset: step;
}

.instructions-list li {
    position: relative;
    padding-inline-start: var(--space-10);
    margin-block-end: var(--space-3);
    color: var(--color-text-secondary);
    counter-increment: step;
}

.instructions-list li::before {
    content: counter(step);
    position: absolute;
    inset-inline-start: 0;
    inset-block-start: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-primary);
    color: white;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Code Editor
   ───────────────────────────────────────────────────────────────────────────── */
.code-editor {
    position: relative;
    display: flex;
    background: var(--color-code-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.7;
    /* Fixed height with internal scroll */
    max-height: 300px;
    transition: max-height 0.3s ease;
}

/* Expanded state - full height */
.code-editor--expanded {
    max-height: none;
}

.code-editor__line-numbers {
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.3);
    color: var(--color-code-line-numbers);
    text-align: end;
    user-select: none;
    min-inline-size: 50px;
    border-inline-end: 1px solid var(--color-glass-border);
    overflow-y: auto;
}

.code-editor__textarea {
    flex: 1;
    padding: var(--space-4);
    background: transparent;
    border: none;
    color: var(--color-code-text);
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    resize: none; /* Disable manual resize */
    min-height: 250px;
    outline: none;
    caret-color: var(--color-accent-primary);
    overflow-y: auto;
}

/* Expand/Collapse button */
.code-editor__toggle {
    position: absolute;
    bottom: var(--space-2);
    right: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--text-xs);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease, background 0.2s ease;
    z-index: 10;
}

.code-editor:hover .code-editor__toggle,
.code-editor--has-content .code-editor__toggle {
    opacity: 1;
}

.code-editor__toggle:hover {
    background: var(--color-accent-primary);
    color: white;
    border-color: var(--color-accent-primary);
}

.code-editor__toggle-icon {
    transition: transform 0.2s ease;
}

.code-editor--expanded .code-editor__toggle-icon {
    transform: rotate(180deg);
}

.code-editor__textarea::placeholder {
    color: var(--color-text-muted);
}

/* Detected Language Badge */
.detected-language {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    color: white;
    animation: pop-in 0.3s var(--transition-spring);
}

@keyframes pop-in {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ─────────────────────────────────────────────────────────────────────────────
   File Upload
   ───────────────────────────────────────────────────────────────────────────── */
.file-upload {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.file-upload__options {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.file-upload__label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--color-glass);
    border: 2px dashed var(--color-glass-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    flex: 1;
    min-width: 120px;
    justify-content: center;
}

.file-upload__label:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-glass-hover);
    color: var(--color-text-primary);
}

.file-upload__input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
}

.file-upload__info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.05));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-lg);
}

.file-upload__count {
    flex: 1;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent-tertiary);
}

.file-upload__clear {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-upload__clear:hover {
    background: var(--color-error);
    border-color: var(--color-error);
    color: white;
}

.file-upload__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    max-height: 200px;
    overflow-y: auto;
    padding: var(--space-3);
    background: var(--color-code-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
}

.file-upload__list-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    transition: background var(--transition-fast);
}

.file-upload__list-item:hover {
    background: var(--color-glass);
}

.file-upload__list-item--active {
    background: rgba(99, 102, 241, 0.2);
    color: var(--color-accent-tertiary);
}

.file-upload__list-icon {
    opacity: 0.6;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Example Dropdown
   ───────────────────────────────────────────────────────────────────────────── */
.example-dropdown {
    position: relative;
}

.example-dropdown__trigger {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.example-dropdown__arrow {
    font-size: 0.6em;
    opacity: 0.7;
    transition: transform var(--transition-base);
}

.example-dropdown[data-open="true"] .example-dropdown__arrow {
    transform: rotate(180deg);
}

.example-dropdown__menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 50%;
    transform: translateX(-50%);
    min-width: 160px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.example-dropdown__menu:not([hidden]) {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.example-dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: background var(--transition-base);
    text-align: start;
}

.example-dropdown__item:hover {
    background: var(--color-glass);
}

.example-dropdown__icon {
    font-size: 1.1em;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Stats Bar
   ───────────────────────────────────────────────────────────────────────────── */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    animation: fade-in-up 0.4s ease both;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3);
}

.stat__value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-accent-primary);
    font-variant-numeric: tabular-nums;
}

.stat__value--badge {
    font-size: var(--text-sm);
    padding: var(--space-1) var(--space-3);
    background: var(--color-accent-primary);
    color: white;
    border-radius: var(--radius-full);
}

.stat__label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Options Section
   ───────────────────────────────────────────────────────────────────────────── */
.options-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.option-group {
    border: none;
}

.option-group__label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

/* Level Selector */
.level-selector {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.level-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    background: var(--color-glass);
    border: 2px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 120px;
}

.level-btn:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-glass-hover);
    transform: translateY(-2px);
}

.level-btn--active {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

.level-btn--active:hover {
    transform: translateY(-2px);
}

.level-btn__icon {
    font-size: var(--text-2xl);
}

.level-btn__label {
    font-size: var(--text-sm);
    font-weight: 500;
}

/* Focus Tags */
.focus-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.focus-tag {
    padding: var(--space-2) var(--space-4);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.focus-tag:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
}

.focus-tag--active {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Output Section
   ───────────────────────────────────────────────────────────────────────────── */
.token-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.token-badge__icon {
    color: var(--color-warning);
}

.output-content {
    background: var(--color-code-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    max-height: 400px;
    overflow: auto;
}

.output-pre {
    padding: var(--space-4);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.6;
    color: var(--color-code-text);
    white-space: pre-wrap;
    word-wrap: break-word;
    margin: 0;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Buttons
   ───────────────────────────────────────────────────────────────────────────── */
.actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    background: var(--color-glass);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

.btn--primary {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    border: none;
    color: white;
}

.btn--primary:hover {
    box-shadow: var(--shadow-glow);
}

.btn--secondary {
    background: var(--color-glass-bg);
    border: 1px solid var(--color-accent-primary);
    color: var(--color-accent-primary);
}

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

.btn--success {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    border: none;
    color: white;
}

.btn--success:hover {
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.4);
}

.btn--large {
    padding: var(--space-4) var(--space-10);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Export Dropdown
   ───────────────────────────────────────────────────────────────────────────── */
.export-dropdown {
    position: relative;
}

.export-dropdown__trigger {
    gap: var(--space-2);
}

.export-dropdown__arrow {
    font-size: 0.7em;
    margin-inline-start: var(--space-1);
    transition: transform var(--transition-base);
}

.export-dropdown[data-open="true"] .export-dropdown__arrow {
    transform: rotate(180deg);
}

.export-dropdown__menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.export-dropdown__menu:not([hidden]) {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.export-dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: var(--text-base);
    cursor: pointer;
    transition: background var(--transition-base);
    text-align: start;
}

.export-dropdown__item:hover {
    background: var(--color-glass);
}

.export-dropdown__icon {
    font-size: 1.2em;
}

/* ─────────────────────────────────────────────────────────────────────────────
   AI Shortcuts
   ───────────────────────────────────────────────────────────────────────────── */
.ai-shortcuts {
    text-align: center;
    animation: fade-in-up 0.5s ease both;
    animation-delay: 0.1s;
}

.ai-shortcuts__title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

.ai-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
}

.ai-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--color-glass);
    border: 2px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.ai-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.ai-btn--chatgpt {
    color: var(--color-chatgpt);
    border-color: var(--color-chatgpt);
}
.ai-btn--chatgpt:hover {
    background: var(--color-chatgpt);
    color: white;
}

.ai-btn--claude {
    color: var(--color-claude);
    border-color: var(--color-claude);
}
.ai-btn--claude:hover {
    background: var(--color-claude);
    color: white;
}

.ai-btn--gemini {
    color: var(--color-gemini);
    border-color: var(--color-gemini);
}
.ai-btn--gemini:hover {
    background: var(--color-gemini);
    color: white;
}

.ai-btn--perplexity {
    color: var(--color-perplexity);
    border-color: var(--color-perplexity);
}
.ai-btn--perplexity:hover {
    background: var(--color-perplexity);
    color: white;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Toast Notifications
   ───────────────────────────────────────────────────────────────────────────── */
.toast-container {
    position: fixed;
    inset-block-end: var(--space-6);
    inset-inline-start: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    animation: toast-in 0.4s var(--transition-spring);
}

.toast--success {
    border-color: var(--color-success);
}

.toast--success .toast__icon {
    color: var(--color-success);
}

.toast--error {
    border-color: var(--color-error);
}

.toast--error .toast__icon {
    color: var(--color-error);
}

.toast__icon {
    font-size: var(--text-xl);
}

.toast__message {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast--exit {
    animation: toast-out 0.3s ease forwards;
}

@keyframes toast-out {
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* ─────────────────────────────────────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────────────────────────────────────── */
.footer {
    padding: var(--space-6) 0;
    border-top: 1px solid var(--color-glass-border);
    text-align: center;
}

.footer__container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

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

.footer__separator {
    margin-inline: var(--space-2);
    color: var(--color-text-muted);
}

.footer__emoji {
    margin-inline-start: var(--space-1);
}

.footer__credit {
    margin-top: var(--space-2);
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

.footer__resources {
    margin-top: var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.footer__link {
    color: var(--color-accent-primary);
    text-decoration: none;
    margin-inline-start: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-glass-bg);
    border: 1px solid var(--color-accent-primary);
    transition: all var(--transition-fast);
}

.footer__link:hover {
    background: var(--color-accent-primary);
    color: white;
    transform: translateY(-2px);
}

/* ─────────────────────────────────────────────────────────────────────────────
   Hidden utility
   ───────────────────────────────────────────────────────────────────────────── */
[hidden] {
    display: none !important;
}

/* ─────────────────────────────────────────────────────────────────────────────
   Responsive Design
   ───────────────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .header__container {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .header__brand {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .level-selector {
        flex-direction: column;
    }
    
    .level-btn {
        flex-direction: row;
        justify-content: flex-start;
        inline-size: 100%;
    }
    
    .ai-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .ai-btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding-inline: var(--space-3);
    }
    
    .card {
        padding: var(--space-4);
    }
    
    .stats-bar {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2);
    }
}

/* ─────────────────────────────────────────────────────────────────────────────
   Reduced Motion
   ───────────────────────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .gradient-orb {
        animation: none;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* ─────────────────────────────────────────────────────────────────────────────
   Print Styles
   ───────────────────────────────────────────────────────────────────────────── */
@media print {
    /* Hide non-essential elements */
    .background-effects,
    .lang-switcher,
    .file-upload,
    .actions,
    .ai-shortcuts,
    .toast-container,
    .card--info,
    .card--input,
    .card--options,
    .code-editor__toggle,
    .skip-link,
    .footer {
        display: none !important;
    }
    
    /* Reset colors for print */
    body {
        background: white !important;
        color: black !important;
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .app {
        background: white !important;
    }
    
    .header {
        background: white !important;
        border-bottom: 2px solid #333;
        padding: 10pt 0;
        margin-bottom: 20pt;
    }
    
    .header__logo {
        height: 40px;
        filter: none;
    }
    
    /* Output section for print */
    .card--output {
        border: none !important;
        background: white !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    
    .card__header {
        border-bottom: 1px solid #ccc;
        padding-bottom: 10pt;
        margin-bottom: 15pt;
    }
    
    .card__title {
        color: black !important;
        font-size: 14pt;
    }
    
    .output-pre {
        background: #f5f5f5 !important;
        color: black !important;
        border: 1px solid #ddd;
        padding: 15pt;
        font-size: 10pt;
        line-height: 1.6;
        white-space: pre-wrap;
        word-wrap: break-word;
        page-break-inside: avoid;
    }
    
    .token-badge {
        background: #eee !important;
        color: #333 !important;
        border: 1px solid #ccc;
    }
    
    /* Page settings */
    @page {
        margin: 2cm;
        size: A4;
    }
}