/* ========================================================
   VidGrab — Premium YouTube Downloader
   ======================================================== */

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

:root {
    /* Core Palette */
    --primary: #6c5ce7;
    --primary-hover: #5a4bd1;
    --primary-light: rgba(108, 92, 231, 0.12);
    --accent: #00cec9;
    --accent-hover: #00b5b1;
    --accent-glow: rgba(0, 206, 201, 0.25);
    
    /* Gradient */
    --gradient-hero: linear-gradient(135deg, #0c0c1d 0%, #1a1a3e 40%, #2d1b69 100%);
    --gradient-primary: linear-gradient(135deg, #6c5ce7, #a29bfe);
    --gradient-accent: linear-gradient(135deg, #00cec9, #81ecec);
    --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    
    /* Dark Theme */
    --bg-body: #0a0a1a;
    --bg-section: #0f0f23;
    --bg-card: #161630;
    --bg-card-hover: #1e1e45;
    --bg-input: #1c1c40;
    --bg-table-row: rgba(255,255,255,0.03);
    --bg-table-hover: rgba(108, 92, 231, 0.08);
    
    /* Text */
    --text-primary: #f0f0ff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8d;
    --text-link: #a29bfe;
    
    /* Borders */
    --border-subtle: rgba(255,255,255,0.06);
    --border-card: rgba(255,255,255,0.08);
    --border-input: rgba(255,255,255,0.12);
    --border-focus: rgba(108, 92, 231, 0.5);
    
    /* Misc */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(108, 92, 231, 0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --header-height: 72px;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: inherit;
    background: none;
}

img {
    max-width: 100%;
    display: block;
}

ul { list-style: none; }

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* -- Utility --------------------------------------------- */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* -- Animations ----------------------------------------- */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(108, 92, 231, 0.2); }
    50% { box-shadow: 0 0 40px rgba(108, 92, 231, 0.4); }
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes slide-in {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========================================================
   HEADER
   ======================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: background var(--transition);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    z-index: 10;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--gradient-primary);
    color: #fff;
    font-size: 0.9rem;
}

.logo-accent {
    color: var(--accent);
}

/* Navigation */
.nav-list {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

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

.nav-link.active {
    color: #fff;
    background: var(--primary);
}

/* Language Selector */
.lang-selector {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,0.05);
    padding: 6px 12px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-subtle);
}

.lang-icon { font-size: 0.9rem; }

.lang-selector select {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-family: inherit;
    cursor: pointer;
    outline: none;
}

.lang-selector select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    z-index: 10;
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}
.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ========================================================
   HERO SECTION
   ======================================================== */
.hero {
    position: relative;
    padding: 160px 0 100px;
    background: var(--gradient-hero);
    overflow: hidden;
    min-height: 540px;
    display: flex;
    align-items: center;
}

.hero-bg-effects {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}

.hero-circle-1 {
    width: 500px;
    height: 500px;
    background: rgba(108, 92, 231, 0.3);
    top: -150px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.hero-circle-2 {
    width: 350px;
    height: 350px;
    background: rgba(0, 206, 201, 0.2);
    bottom: -100px;
    left: -80px;
    animation: float 10s ease-in-out infinite 2s;
}

.hero-circle-3 {
    width: 250px;
    height: 250px;
    background: rgba(162, 155, 254, 0.2);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 12s ease-in-out infinite 4s;
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 2;
    animation: fade-up 0.8s ease forwards;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

/* Search Box */
.search-box {
    display: flex;
    align-items: center;
    gap: 0;
    max-width: 680px;
    margin: 0 auto;
    background: var(--bg-input);
    border: 2px solid var(--border-input);
    border-radius: var(--radius-xl);
    padding: 6px 6px 6px 20px;
    transition: all var(--transition);
    box-shadow: var(--shadow-glow);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.15), var(--shadow-glow);
}

.search-input-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.search-icon {
    color: var(--text-muted);
    flex-shrink: 0;
    display: flex;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    padding: 14px 0;
    min-width: 0;
}

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

.btn-clear {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 4px 8px;
    border-radius: 50%;
    transition: all var(--transition);
}

.btn-clear:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

.btn-start {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-primary);
    color: #fff;
    padding: 14px 32px;
    border-radius: calc(var(--radius-xl) - 2px);
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    transition: all var(--transition);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.btn-start:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.4);
}

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

.hero-disclaimer {
    margin-top: 16px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.hero-disclaimer a {
    color: var(--text-link);
}

.hero-disclaimer a:hover {
    text-decoration: underline;
}

/* ========================================================
   PROCESSING SECTION
   ======================================================== */
.processing-section {
    padding: 40px 0;
}

.processing-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 48px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-card);
    animation: fade-up 0.4s ease;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.processing-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========================================================
   RESULT SECTION
   ======================================================== */
.result-section {
    padding: 0 0 60px;
}

.result-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-card);
    overflow: hidden;
    animation: fade-up 0.5s ease;
    box-shadow: var(--shadow-lg);
}

.result-header {
    display: flex;
    gap: 20px;
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.result-thumbnail {
    position: relative;
    width: 200px;
    min-width: 200px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: rgba(0,0,0,0.3);
    flex-shrink: 0;
}

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

.result-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}

.result-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.result-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.result-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Format Tabs */
.format-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-subtle);
}

.format-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
}

.format-tab:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.02);
}

.format-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Download Table */
.download-table-wrap {
    overflow-x: auto;
}

.download-table {
    width: 100%;
    border-collapse: collapse;
}

.download-table th {
    text-align: left;
    padding: 14px 24px;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-subtle);
}

.download-table td {
    padding: 14px 24px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
}

.download-table tbody tr {
    transition: background var(--transition);
}

.download-table tbody tr:hover {
    background: var(--bg-table-hover);
}

.download-table tbody tr:last-child td {
    border-bottom: none;
}

.quality-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.quality-tag {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.quality-tag.hd {
    background: rgba(108, 92, 231, 0.15);
    color: var(--primary);
}

.quality-tag.fhd {
    background: rgba(0, 206, 201, 0.15);
    color: var(--accent);
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
}

.btn-download.primary {
    background: var(--primary);
    color: #fff;
}

.btn-download.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.btn-download.accent {
    background: var(--accent);
    color: #0a0a1a;
}

.btn-download.accent:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 206, 201, 0.3);
}

/* ========================================================
   FEATURES SECTION
   ======================================================== */
.features-section {
    padding: 100px 0;
    background: var(--bg-section);
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 56px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 36px 28px;
    background: var(--gradient-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.05), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(108, 92, 231, 0.2);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.feature-icon-speed {
    background: rgba(255, 180, 0, 0.1);
    color: #ffb400;
}

.feature-icon-free {
    background: rgba(0, 206, 201, 0.1);
    color: var(--accent);
}

.feature-icon-install {
    background: rgba(108, 92, 231, 0.1);
    color: var(--primary);
}

.feature-icon-formats {
    background: rgba(255, 107, 107, 0.1);
    color: #ff6b6b;
}

.feature-icon-devices {
    background: rgba(46, 213, 115, 0.1);
    color: #2ed573;
}

.feature-icon-secure {
    background: rgba(30, 144, 255, 0.1);
    color: #1e90ff;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    position: relative;
}

/* ========================================================
   FORMATS SECTION
   ======================================================== */
.formats-section {
    padding: 80px 0;
    background: var(--bg-body);
}

.formats-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
}

.format-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.format-badge {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    transition: all var(--transition);
    cursor: default;
}

.video-badge {
    background: rgba(108, 92, 231, 0.12);
    color: var(--primary);
    border: 1px solid rgba(108, 92, 231, 0.2);
}

.audio-badge {
    background: rgba(0, 206, 201, 0.12);
    color: var(--accent);
    border: 1px solid rgba(0, 206, 201, 0.2);
}

.quality-badge {
    background: rgba(255,255,255,0.04);
    color: var(--text-secondary);
    border: 1px solid var(--border-card);
}

.quality-badge.highlight {
    background: rgba(108, 92, 231, 0.15);
    color: var(--primary);
    border-color: rgba(108, 92, 231, 0.3);
    box-shadow: 0 0 15px rgba(108, 92, 231, 0.1);
}

.format-badge:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.quality-item span { display: none; }

/* ========================================================
   HOW TO SECTION
   ======================================================== */
.howto-section {
    padding: 100px 0;
    background: var(--bg-section);
}

.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-top: 16px;
}

.step-card {
    flex: 1;
    max-width: 280px;
    text-align: center;
    padding: 36px 24px;
    position: relative;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 1rem;
    font-weight: 800;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.step-icon {
    color: var(--text-muted);
    margin-bottom: 16px;
}

.step-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.step-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.step-connector {
    color: var(--text-muted);
    flex-shrink: 0;
    margin-top: -20px;
}

/* ========================================================
   PRO TIP SECTION
   ======================================================== */
.tip-section {
    padding: 60px 0;
    background: var(--bg-body);
}

.tip-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.tip-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.tip-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.tip-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.tip-text strong {
    color: var(--accent);
}

.tip-example {
    display: inline-block;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 14px 28px;
}

.tip-example code {
    font-family: 'Fira Code', monospace, 'Inter';
    font-size: 0.9rem;
}

.url-dim { color: var(--text-muted); }
.url-highlight {
    color: var(--accent);
    font-weight: 700;
    background: rgba(0, 206, 201, 0.1);
    padding: 2px 4px;
    border-radius: 4px;
}

/* ========================================================
   FAQ SECTION
   ======================================================== */
.faq-section {
    padding: 100px 0;
    background: var(--bg-section);
}

.faq-list {
    max-width: 760px;
    margin: 48px auto 0;
}

.faq-item {
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item:hover {
    border-color: rgba(108, 92, 231, 0.2);
}

.faq-item.open {
    border-color: rgba(108, 92, 231, 0.3);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 18px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    transition: background var(--transition);
}

.faq-question:hover {
    background: rgba(255,255,255,0.02);
}

.faq-chevron {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition);
}

.faq-item.open .faq-chevron {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================================
   FOOTER
   ======================================================== */
.footer {
    padding: 60px 0 0;
    background: var(--bg-body);
    border-top: 1px solid var(--border-subtle);
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand {}

.footer-logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    max-width: 300px;
    line-height: 1.6;
    margin-top: 16px;
}

.footer-links-group h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-links-group ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links-group a {
    font-size: 0.88rem;
    color: var(--text-muted);
    transition: color var(--transition);
}

.footer-links-group a:hover {
    color: var(--text-link);
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========================================================
   SCROLL TO TOP
   ======================================================== */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
    transition: all var(--transition);
    z-index: 900;
    opacity: 0;
    transform: translateY(10px);
}

.scroll-top-btn.visible {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.4);
}

/* ========================================================
   TOAST NOTIFICATION
   ======================================================== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    color: var(--text-primary);
    padding: 14px 28px;
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    transition: all 0.4s ease;
    box-shadow: var(--shadow-lg);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    border-color: rgba(255, 107, 107, 0.3);
}

.toast.success {
    border-color: rgba(0, 206, 201, 0.3);
}

/* ========================================================
   RESPONSIVE
   ======================================================== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }
    
    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 26, 0.97);
        backdrop-filter: blur(20px);
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
        z-index: 5;
    }
    
    .nav.open {
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .nav-link {
        font-size: 1.2rem;
        padding: 12px 28px;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .lang-selector {
        display: none;
    }
    
    .hero {
        padding: 130px 0 70px;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
    }
    
    .search-box {
        flex-direction: column;
        padding: 8px;
        border-radius: var(--radius-lg);
    }
    
    .search-input-wrap {
        width: 100%;
        padding: 4px 12px;
    }
    
    .btn-start {
        width: 100%;
        justify-content: center;
        padding: 14px;
        border-radius: var(--radius-md);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        flex-direction: column;
        gap: 8px;
    }
    
    .step-connector {
        transform: rotate(90deg);
        margin: 0;
    }
    
    .result-header {
        flex-direction: column;
    }
    
    .result-thumbnail {
        width: 100%;
        min-width: 100%;
        height: 180px;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .download-table th,
    .download-table td {
        padding: 12px 14px;
        font-size: 0.82rem;
    }
    
    .format-badge {
        width: 56px;
        height: 56px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .tip-card {
        padding: 28px 20px;
    }

    .tip-example {
        padding: 10px 16px;
    }

    .tip-example code {
        font-size: 0.75rem;
    }
}