/* ===== Premium CSS Variables ===== */
:root {
    /* Dark Theme (Default) */
    --bg-primary: #09090b;
    --bg-secondary: #0c0c0e;
    --bg-tertiary: #131316;
    --bg-card: rgba(19, 19, 22, 0.8);
    --bg-card-solid: #131316;
    --bg-elevated: rgba(24, 24, 27, 0.9);
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #52525b;
    --text-muted: #3f3f46;
    
    --border-color: rgba(63, 63, 70, 0.5);
    --border-subtle: rgba(63, 63, 70, 0.3);
    
    --accent-primary: #ffffff;
    --accent-secondary: #a1a1aa;
    --accent-glow: rgba(255, 255, 255, 0.1);
    
    --gradient-1: #18181b;
    --gradient-2: #27272a;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.05);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
.light-theme {
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f4f4f5;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-solid: #ffffff;
    --bg-elevated: rgba(255, 255, 255, 0.95);
    
    --text-primary: #09090b;
    --text-secondary: #52525b;
    --text-tertiary: #a1a1aa;
    --text-muted: #d4d4d8;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --border-subtle: rgba(0, 0, 0, 0.05);
    
    --accent-primary: #09090b;
    --accent-secondary: #52525b;
    --accent-glow: rgba(0, 0, 0, 0.05);
    
    --gradient-1: #f4f4f5;
    --gradient-2: #e4e4e7;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(0, 0, 0, 0.03);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ===== Premium Background ===== */
.premium-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
    top: -400px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
    bottom: -300px;
    left: -200px;
    animation-delay: -7s;
}

.orb-3 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.04) 0%, transparent 70%);
    top: 40%;
    left: 30%;
    animation-delay: -14s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(40px, -40px) scale(1.05); }
    50% { transform: translate(-30px, 30px) scale(0.95); }
    75% { transform: translate(30px, 40px) scale(1.02); }
}

.light-theme .gradient-orb {
    opacity: 0.3;
}

.light-theme .orb-1 {
    background: radial-gradient(circle, rgba(0,0,0,0.04) 0%, transparent 70%);
}

.light-theme .orb-2 {
    background: radial-gradient(circle, rgba(0,0,0,0.03) 0%, transparent 70%);
}

.light-theme .orb-3 {
    background: radial-gradient(circle, rgba(0,0,0,0.02) 0%, transparent 70%);
}

/* Grid Overlay */
.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.light-theme .grid-overlay {
    background-image: 
        linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
}

/* Noise Overlay */
.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;
}

/* Particles */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--text-tertiary);
    border-radius: 50%;
    opacity: 0;
    animation: particleFade 4s ease-in-out infinite;
}

@keyframes particleFade {
    0%, 100% { opacity: 0; transform: translateY(0); }
    50% { opacity: 0.5; transform: translateY(-20px); }
}


/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(9, 9, 11, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
}

.light-theme .header {
    background: rgba(250, 250, 250, 0.85);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-mark {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #fff 0%, #888 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 800;
    color: #09090b;
    font-family: 'Space Grotesk', sans-serif;
    letter-spacing: -0.5px;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.logo-accent {
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-links {
    display: flex;
    gap: 4px;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--bg-card-solid);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.nav-link i {
    font-size: 12px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.usage-display {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.usage-display i {
    color: var(--text-tertiary);
    font-size: 11px;
}

.lang-toggle {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.lang-toggle:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.theme-toggle {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.theme-toggle:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

/* ===== Main Content ===== */
.main-content {
    position: relative;
    z-index: 2;
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px 100px;
}

.section {
    display: none;
}

.section.active {
    display: block;
    animation: fadeUp 0.5s ease;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Hero ===== */
.hero {
    text-align: center;
    margin-bottom: 56px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hero-badge i {
    color: var(--text-tertiary);
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 16px;
}

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

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== Section Header ===== */
.section-header {
    margin-bottom: 28px;
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
}

.section-header h2 i {
    color: var(--text-tertiary);
    font-size: 16px;
}

.section-header p {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ===== Categories Grid ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.category-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-base);
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, var(--accent-glow) 100%);
    opacity: 0;
    transition: var(--transition-base);
}

.category-card:hover {
    border-color: var(--border-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition-slow);
    pointer-events: none;
}

.category-card:hover .card-glow {
    opacity: 1;
}

.card-content {
    position: relative;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
}

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-primary);
    flex-shrink: 0;
    transition: var(--transition-base);
}

.category-card:hover .category-icon {
    background: var(--bg-elevated);
    border-color: var(--border-color);
    transform: scale(1.05);
}

.category-info {
    flex: 1;
    min-width: 0;
}

.category-info h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
}

.category-info p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.category-arrow {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition-base);
}

.category-card:hover .category-arrow {
    color: var(--text-secondary);
    transform: translateX(4px);
}

/* ===== Generator Panel ===== */
.generator-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    overflow: hidden;
    animation: slideUp 0.4s ease;
}

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

.panel-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-tertiary);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-card-solid);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.back-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 14px;
}

.panel-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-card-solid);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-primary);
}

.panel-title h2 {
    font-size: 18px;
    font-weight: 600;
}

.panel-title p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.form-container {
    padding: 28px;
}

.form-group {
    margin-bottom: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.form-label i {
    font-size: 12px;
    color: var(--text-tertiary);
}

.input-wrapper {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--text-tertiary);
    background: var(--bg-secondary);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.input-focus-ring {
    position: absolute;
    inset: -2px;
    border-radius: calc(var(--radius-md) + 2px);
    border: 2px solid var(--accent-primary);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
}

.form-input:focus ~ .input-focus-ring {
    opacity: 0.2;
}

.select-wrapper {
    position: relative;
}

.form-select {
    width: 100%;
    padding: 14px 18px;
    padding-right: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    cursor: pointer;
    appearance: none;
    transition: var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--text-tertiary);
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-tertiary);
    pointer-events: none;
}

.form-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 12px;
}


/* ===== Slider ===== */
.slider-wrapper {
    position: relative;
    padding: 8px 0;
}

.form-slider {
    width: 100%;
    height: 6px;
    background: transparent;
    appearance: none;
    cursor: pointer;
    position: relative;
    z-index: 2;
}

.slider-track {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    transform: translateY(-50%);
    overflow: hidden;
}

.slider-fill {
    height: 100%;
    background: var(--text-tertiary);
    border-radius: 3px;
    width: 50%;
    transition: width 0.1s ease;
}

.form-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition-fast);
}

.form-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== Generate Button ===== */
.generate-btn {
    position: relative;
    width: 100%;
    padding: 18px 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    overflow: hidden;
    margin-top: 8px;
}

.btn-bg {
    position: absolute;
    inset: 0;
    background: var(--text-primary);
    transition: var(--transition-base);
}

.btn-content {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--bg-primary);
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
}

.btn-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.generate-btn:hover .btn-shine {
    left: 100%;
}

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

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

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(9, 9, 11, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.light-theme .loading-overlay {
    background: rgba(250, 250, 250, 0.9);
}

.loading-content {
    text-align: center;
}

.ai-loader {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto 32px;
}

.loader-ring {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: loaderSpin 1.5s linear infinite;
}

.loader-ring:nth-child(2) {
    inset: 10px;
    animation-delay: -0.5s;
    border-top-color: var(--text-secondary);
}

.loader-ring:nth-child(3) {
    inset: 20px;
    animation-delay: -1s;
    border-top-color: var(--text-tertiary);
}

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

.loader-core {
    position: absolute;
    inset: 30px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-primary);
    animation: corePulse 1.5s ease-in-out infinite;
}

@keyframes corePulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(0.9); opacity: 0.7; }
}

.loading-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.loading-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.loading-dots {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: 50%;
    animation: dotBounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotBounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* ===== Result Panel ===== */
.result-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    margin-top: 24px;
    overflow: hidden;
    animation: slideUp 0.4s ease;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-tertiary);
}

.result-title {
    display: flex;
    align-items: center;
    gap: 14px;
}

.result-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--text-primary);
}

.result-title h3 {
    font-size: 16px;
    font-weight: 600;
}

.result-title p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.result-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    position: relative;
    width: 40px;
    height: 40px;
    background: var(--bg-card-solid);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.action-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.action-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
}

.action-btn:hover[data-tooltip]::after {
    opacity: 1;
    visibility: visible;
}

.result-body {
    padding: 24px;
}

.result-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 20px;
    font-size: 15px;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-word;
    min-height: 120px;
    max-height: 400px;
    overflow-y: auto;
}

.result-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-tertiary);
}

.result-meta {
    display: flex;
    gap: 16px;
}

.meta-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-card-solid);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-secondary);
}

.meta-badge i {
    color: var(--text-tertiary);
    font-size: 11px;
}

/* ===== History ===== */
.history-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 28px;
}

.history-header h2 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

.history-header p {
    color: var(--text-tertiary);
    font-size: 14px;
}

.clear-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.clear-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: var(--transition-fast);
}

.history-item:hover {
    border-color: var(--border-color);
}

.history-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.history-category {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.history-date {
    font-size: 12px;
    color: var(--text-muted);
}

.history-content {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.history-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
}

.history-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.history-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.history-btn.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-icon {
    width: 80px;
    height: 80px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 32px;
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.empty-state p {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    font-size: 14px;
    font-weight: 500;
    z-index: 1001;
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast-icon {
    width: 28px;
    height: 28px;
    background: rgba(34, 197, 94, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #22c55e;
    font-size: 12px;
}

.toast.error .toast-icon {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-inner {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .main-content {
        padding: 32px 16px 80px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .result-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
}


/* ===== Footer with NVIDIA ===== */
.footer {
    position: relative;
    z-index: 2;
    padding: 40px 24px 60px;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.powered-by {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 500;
}

.nvidia-logo {
    display: block;
    opacity: 0.3;
    transition: all 0.4s ease;
    filter: grayscale(100%);
}

.nvidia-logo:hover {
    opacity: 1;
    filter: grayscale(0%);
    transform: scale(1.05);
}

.nvidia-logo img {
    height: 32px;
    width: auto;
}

.light-theme .nvidia-logo {
    filter: grayscale(100%) brightness(0.3);
}

.light-theme .nvidia-logo:hover {
    filter: grayscale(0%) brightness(1);
}


/* Usage Badge */
.usage-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
}

.usage-badge i {
    color: var(--text-tertiary);
}


/* ===== Pages ===== */
.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeUp 0.4s ease;
}

/* ===== Tool Card ===== */
.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 28px;
    backdrop-filter: blur(10px);
}

.form-textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    min-height: 100px;
    resize: vertical;
    transition: var(--transition-fast);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--text-tertiary);
    background: var(--bg-secondary);
}

.form-textarea::placeholder {
    color: var(--text-muted);
}

/* Example Chips */
.example-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.chip {
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    color: var(--text-secondary);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

/* Sources */
.sources-section {
    padding: 16px 24px;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-tertiary);
}

.sources-section h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    font-weight: 600;
}

.source-item {
    padding: 6px 0;
    font-size: 13px;
}

.source-item a {
    color: #60a5fa;
    text-decoration: none;
    transition: var(--transition-fast);
}

.source-item a:hover {
    text-decoration: underline;
}

/* ===== Beta Banner ===== */
.beta-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    background: linear-gradient(90deg, rgba(34, 197, 94, 0.1), rgba(59, 130, 246, 0.1));
    border-bottom: 1px solid var(--border-subtle);
    font-size: 13px;
    color: var(--text-secondary);
}

.beta-banner i {
    color: #22c55e;
}

.light-theme .beta-banner {
    background: linear-gradient(90deg, rgba(34, 197, 94, 0.08), rgba(59, 130, 246, 0.08));
}

/* ===== Hamburger Menu ===== */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 12px;
    transition: var(--transition-fast);
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--bg-elevated);
    border-color: var(--border-color);
}

.menu-toggle:hover span {
    background: var(--text-primary);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Menu Overlay ===== */
.menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.menu-overlay.active {
    display: block;
    opacity: 1;
}

/* ===== Mobile Responsive ===== */
@media (max-width: 900px) {
    .header-inner {
        display: flex;
        justify-content: space-between;
        padding: 12px 16px;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: var(--bg-secondary);
        border-left: 1px solid var(--border-subtle);
        padding: 80px 20px 20px;
        gap: 8px;
        z-index: 95;
        transition: right 0.3s ease;
        border-radius: 0;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-link {
        padding: 14px 18px;
        border-radius: var(--radius-md);
        background: var(--bg-tertiary);
        border: 1px solid var(--border-subtle);
    }

    .nav-link.active {
        background: var(--bg-card-solid);
    }

    .header-right {
        display: none;
    }

    .beta-banner {
        font-size: 12px;
        padding: 8px 16px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 20px;
    }

    .form-container {
        padding: 20px;
    }

    .result-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
        padding: 16px 20px;
    }

    .result-body {
        padding: 16px 20px;
    }

    .tool-card {
        padding: 20px;
    }

    .main-content {
        padding: 24px 16px 80px;
    }

    .history-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 18px;
    }

    .hero-title {
        font-size: 24px;
    }

    .card-content {
        padding: 16px;
        gap: 12px;
    }

    .category-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .category-info h3 {
        font-size: 14px;
    }

    .category-info p {
        font-size: 12px;
    }

    .generate-btn {
        padding: 14px 24px;
    }

    .btn-content {
        font-size: 14px;
    }
}