/* ============================================
   SubFine Website - Main Stylesheet
   Dark Mode Design with Rich Gradient Accents
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&family=Tajawal:wght@400;500;700;800&display=swap');

/* ============================================
   CSS Variables - Design System
   ============================================ */
:root {
    /* Primary Palette - Gold/Amber */
    --primary-yellow: #F4D03F;
    --primary-yellow-hover: #F0C419;
    --primary-yellow-dim: rgba(244, 208, 63, 0.1);
    --primary-amber: #F5A623;

    /* Hero Gradient - warm gold → amber */
    --gradient-primary: linear-gradient(135deg, #F4D03F 0%, #F5A623 100%);
    --gradient-primary-hover: linear-gradient(135deg, #F0C419 0%, #E8960F 100%);

    /* Section accent gradients */
    --gradient-blue-purple: linear-gradient(135deg, #4285f4 0%, #9b72cb 100%);
    --gradient-teal-blue:   linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
    --gradient-hero-text:   linear-gradient(135deg, #ffffff 0%, #F4D03F 60%, #F5A623 100%);
    --gradient-section-divider: linear-gradient(90deg, transparent, rgba(244,208,63,0.3), transparent);

    /* Browser brand colors */
    --chrome-color: #4285f4;
    --chrome-dim: rgba(66, 133, 244, 0.12);
    --chrome-border: rgba(66, 133, 244, 0.35);
    --firefox-color: #FF6611;
    --firefox-dim: rgba(255, 102, 17, 0.12);
    --firefox-border: rgba(255, 102, 17, 0.35);

    /* Backgrounds */
    --bg-dark: #09090b;
    --bg-dark-secondary: #0f0f12;
    --bg-dark-tertiary: #1a1a1f;
    --bg-card: #16161b;
    --bg-gradient: linear-gradient(160deg, #09090b 0%, #0f0f12 50%, #09090b 100%);

    /* Text */
    --text-white: #ffffff;
    --text-gray: #a8a8b3;
    --text-dim: #6b6b7a;

    /* Borders */
    --border-dark: #252530;
    --border-subtle: #1e1e28;
    --border-glow: rgba(244, 208, 63, 0.3);
    --border-glow-strong: rgba(244, 208, 63, 0.5);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(244, 208, 63, 0.15);
    --shadow-glow-md: 0 0 50px rgba(244, 208, 63, 0.25);
    --shadow-chrome: 0 4px 20px rgba(66, 133, 244, 0.25);
    --shadow-firefox: 0 4px 20px rgba(255, 102, 17, 0.25);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-ar: 'Tajawal', 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', 'Courier New', monospace;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body[dir="rtl"] {
    font-family: var(--font-family-ar);
}

/* ============================================
   Typography
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-white);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-sm);
}

p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

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

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

/* ============================================
   Container & Layout
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-2xl) 0;
}

/* ============================================
   Navigation
   ============================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(9, 9, 11, 0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    transition: var(--transition-smooth);
}

nav.scrolled {
    background: rgba(9, 9, 11, 0.97);
    border-bottom-color: var(--border-dark);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav-logo:hover {
    color: var(--text-white);
    opacity: 0.9;
}

.nav-logo img {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    box-shadow: 0 0 12px rgba(244, 208, 63, 0.2);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-links a {
    color: var(--text-gray);
    font-weight: 600;
    font-size: 0.92rem;
    transition: var(--transition-fast);
    position: relative;
    padding-bottom: 2px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.25s ease;
}

.nav-links a:hover {
    color: var(--primary-yellow);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* ── Browser icon buttons ── */
.nav-browser-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: var(--transition-bounce);
    position: relative;
    text-decoration: none;
}

.nav-browser-btn img {
    width: 18px;
    height: 18px;
    display: block;
    pointer-events: none;
}

.nav-browser-btn.chrome {
    background: var(--chrome-dim);
    border: 1px solid var(--chrome-border);
}

.nav-browser-btn.firefox {
    background: var(--firefox-dim);
    border: 1px solid var(--firefox-border);
}

.nav-browser-btn.chrome:hover {
    background: rgba(66, 133, 244, 0.25);
    border-color: var(--chrome-color);
    box-shadow: var(--shadow-chrome);
    transform: translateY(-3px) scale(1.08);
}

.nav-browser-btn.firefox:hover {
    background: rgba(255, 102, 17, 0.25);
    border-color: var(--firefox-color);
    box-shadow: var(--shadow-firefox);
    transform: translateY(-3px) scale(1.08);
}

/* tooltip labels */
.nav-browser-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-dark-tertiary);
    border: 1px solid var(--border-dark);
    color: var(--text-gray);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.nav-browser-btn[data-tooltip]:hover::after {
    opacity: 1;
}

/* ── Premium button ── */
.nav-premium-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.45rem 0.95rem;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    background: rgba(244, 208, 63, 0.06);
    color: var(--primary-yellow);
    border: 1px solid rgba(244, 208, 63, 0.25);
    text-decoration: none;
    transition: var(--transition-smooth);
    white-space: nowrap;
}

.nav-premium-btn:hover {
    background: rgba(244, 208, 63, 0.14);
    border-color: var(--primary-yellow);
    color: var(--primary-yellow);
    box-shadow: 0 0 20px rgba(244, 208, 63, 0.15);
    transform: translateY(-1px);
}

.nav-premium-icon {
    width: 14px;
    height: 14px;
    fill: currentColor;
    flex-shrink: 0;
}

/* ── Language toggle ── */
.lang-toggle {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-dark);
    color: var(--text-gray);
    padding: 0.45rem 0.9rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-fast);
    font-family: inherit;
    font-size: 0.85rem;
}

.lang-toggle:hover {
    border-color: var(--primary-yellow);
    color: var(--primary-yellow);
    background: rgba(244, 208, 63, 0.05);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* nav divider */
.nav-divider {
    width: 1px;
    height: 22px;
    background: rgba(255, 255, 255, 0.08);
    margin: 0 2px;
    flex-shrink: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    text-decoration: none;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #000;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow-md);
    background: var(--gradient-primary-hover);
}

/* Hero Chrome button */
.btn-chrome {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    border: none;
}

.btn-chrome:hover {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.45);
    transform: translateY(-2px);
    color: #fff;
}

/* Hero Firefox button */
.btn-firefox {
    background: linear-gradient(135deg, #FF6611 0%, #e8520a 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 102, 17, 0.3);
    border: none;
}

.btn-firefox:hover {
    background: linear-gradient(135deg, #e8520a 0%, #cc450a 100%);
    box-shadow: 0 6px 25px rgba(255, 102, 17, 0.45);
    transform: translateY(-2px);
    color: #fff;
}

.btn-secondary {
    background: var(--bg-dark-tertiary);
    color: var(--text-white);
    border: 1px solid var(--border-dark);
}

.btn-secondary:hover {
    border-color: var(--primary-yellow);
    color: var(--primary-yellow);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--primary-yellow-dim);
    transform: translateY(-2px);
}

.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.3);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--bg-gradient);
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 60% 50% at 20% 60%, rgba(66, 133, 244, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse 50% 50% at 80% 40%, rgba(244, 208, 63, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: var(--bg-dark-tertiary);
    border: 1px solid var(--border-dark);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-yellow);
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    background: linear-gradient(135deg, var(--text-white) 0%, var(--primary-yellow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
}

.hero-visual img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    background: var(--bg-dark-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-section-divider);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.section-subtitle {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-xs);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(244, 208, 63, 0.03) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: var(--radius-lg);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(244, 208, 63, 0.4);
    box-shadow: var(--shadow-glow-md), var(--shadow-md);
}

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

.feature-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, rgba(244, 208, 63, 0.15) 0%, rgba(245, 166, 35, 0.08) 100%);
    border: 1px solid rgba(244, 208, 63, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-white);
}

.feature-card p {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.65;
}

/* ============================================
   Platform Support
   ============================================ */
.platforms {
    background: var(--bg-dark);
}

.platform-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.platform-logo {
    opacity: 0.7;
    transition: var(--transition-fast);
    filter: grayscale(100%);
}

.platform-logo:hover {
    opacity: 1;
    filter: grayscale(0%);
}

.platform-note {
    text-align: center;
    color: var(--text-dim);
    font-style: italic;
    margin-top: var(--spacing-md);
}

/* ============================================
   Screenshots Carousel
   ============================================ */
.screenshots {
    background: var(--bg-dark-secondary);
}

.carousel {
    position: relative;
    max-width: 900px;
    margin: var(--spacing-xl) auto;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    flex-shrink: 0;
}

.carousel-slide img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.carousel-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    padding: 0 var(--spacing-sm);
    pointer-events: none;
}

.carousel-btn {
    background: rgba(244, 208, 63, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid var(--primary-yellow);
    color: var(--primary-yellow);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
    pointer-events: all;
    font-size: 1.5rem;
}

.carousel-btn:hover {
    background: var(--primary-yellow);
    color: #000;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-dark-tertiary);
    border: 1px solid var(--border-dark);
    cursor: pointer;
    transition: var(--transition-fast);
}

.carousel-dot.active {
    background: rgba(244, 208, 63, 0.8);
    border-color: rgba(244, 208, 63, 0.8);
    box-shadow: 0 0 8px rgba(244, 208, 63, 0.4);
}

/* ============================================
   Stats Section
   ============================================ */
.stat-number {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.8rem;
    font-weight: 900;
    font-family: var(--font-mono);
    line-height: 1;
}

/* ============================================
   Footer
   ============================================ */
footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border-dark);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-section-divider);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: var(--primary-yellow);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--primary-yellow);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-dark);
    color: var(--text-dim);
    font-size: 0.875rem;
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
    text-align: center;
}

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

.hidden {
    display: none !important;
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Advanced Features
   ============================================ */
.advanced-features .feature-card {
    max-width: 900px;
    margin: 0 auto;
}

[dir="rtl"] .advanced-features .feature-card {
    text-align: right;
}

[dir="rtl"] .advanced-features .feature-card .feature-icon {
    margin-right: 0;
    margin-left: var(--spacing-md);
}

.advanced-features ul li {
    position: relative;
    padding-left: 0;
}

[dir="rtl"] .advanced-features ul li {
    padding-right: 0;
}

@media (max-width: 768px) {
    .advanced-features .feature-card>div:first-child {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--spacing-sm) !important;
    }
}