/* ========================================
   isl-Tech - Main Stylesheet
   Light/Dark mode with system preference
   ======================================== */

/* ----- CSS Variables (Theme) ----- */
:root {
  /* Default: Dark theme (fallback) */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #242b3d;
  --bg-nav: rgba(10, 14, 23, 0.92);
  --bg-footer: #060912;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent: #14b8a6;
  --accent-light: #2dd4bf;
  --accent-dark: #0d9488;
  --accent-glow: rgba(20, 184, 166, 0.3);

  --border-color: #1e293b;
  --border-light: #334155;

  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 0 30px rgba(20, 184, 166, 0.15);

  --gradient-hero: linear-gradient(
    135deg,
    #0a0e17 0%,
    #0f2847 50%,
    #0a0e17 100%
  );
  --gradient-card: linear-gradient(145deg, #1a1f2e, #111827);
  --gradient-accent: linear-gradient(135deg, #0d9488, #14b8a6);

  --radius: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
}

/* ----- Light Theme ----- */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-nav: rgba(255, 255, 255, 0.92);
  --bg-footer: #0f172a;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --border-color: #e2e8f0;
  --border-light: #cbd5e1;

  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-accent: 0 0 30px rgba(20, 184, 166, 0.1);

  --gradient-hero: linear-gradient(
    135deg,
    #ffffff 0%,
    #e0f2fe 50%,
    #ffffff 100%
  );
  --gradient-card: linear-gradient(145deg, #ffffff, #f8fafc);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-light);
}

/* ----- Logo Styling ----- */
.brand-logo {
  height: 36px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
  object-position: center;
  margin-right: 8px;
  display: block;
  border-radius: 6px;
  background: var(--bg-secondary);
  padding: 2px 6px;
}

/* ----- Auto-fit images & logos ----- */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

img.logo,
img[class*="logo"],
img[alt*="logo" i] {
  object-fit: contain;
  object-position: center;
  width: 100%;
  height: 100%;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ----- Typography ----- */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.2;
  font-weight: 700;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.8rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px var(--accent-glow);
  color: #fff;
}

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

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

.btn-lg {
  padding: 1rem 2.4rem;
  font-size: 1.15rem;
  border-radius: 14px;
}

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.875rem;
}

/* Hero-specific button prominence */
.hero-buttons .btn {
  padding: 1rem 2.4rem;
  font-size: 1.15rem;
  border-radius: 14px;
  letter-spacing: 0.02em;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  font-weight: 700;
}

.nav-brand span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-links a.active {
  color: var(--accent);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.25s ease;
  margin-left: 0.75rem;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-card);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  border: none;
  background: transparent;
  margin-left: 0.75rem;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

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

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

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

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.4;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(56, 189, 248, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero-content h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Hero upload hint */
.hero-upload-hint {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.6;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-upload-hint code {
  background: var(--bg-secondary);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

@media (max-width: 1024px) {
  .hero-upload-hint {
    justify-content: center;
  }
}

/* ========================================
   HERO COVER IMAGE
   ======================================== */
.hero-cover {
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  aspect-ratio: 6 / 5;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.hero-cover:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}

.hero-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.hero-cover-fallback {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  width: 100%;
  height: 100%;
  background: var(--gradient-card);
}

.hero-cover-fallback .hero-cover-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.hero-cover-fallback p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.hero-cover-fallback code {
  background: var(--bg-secondary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

.hero-code-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.8;
}

.hero-code-block .code-comment {
  color: var(--text-muted);
}

.hero-code-block .code-keyword {
  color: var(--accent);
}

.hero-code-block .code-string {
  color: #f472b6;
}

.hero-code-block .code-func {
  color: #60a5fa;
}

.hero-code-block .code-var {
  color: #fbbf24;
}

/* ========================================
   FEATURES / SECTIONS
   ======================================== */
section {
  padding: 6rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-accent);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--accent-glow);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

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

/* ========================================
   APPS PAGE
   ======================================== */
.page-header {
  padding: 8rem 0 3rem;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
}

.page-header h1 {
  font-size: 2.8rem;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.app-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all 0.3s ease;
}

.app-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.app-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.app-card-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-glow);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.app-card h3 {
  font-size: 1.15rem;
}

.app-card .app-meta {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.app-card .app-meta span {
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-weight: 500;
}

.app-card .app-meta .tag-new {
  background: var(--accent);
  color: #fff;
}

.app-card .app-meta .tag-beta {
  background: #f59e0b;
  color: #fff;
}

.app-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.app-card .app-actions {
  display: flex;
  gap: 0.75rem;
}

.app-card-footer {
  align-items: center;
}

.download-icon-btn {
  align-self: center;
}

/* ========================================
   PRODUCTS PAGE
   ======================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
}

.product-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.product-card-img {
  height: 200px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.product-card-body {
  padding: 1.5rem;
}

.product-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.product-card-body .product-price {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.product-card-body p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

/* ========================================
   DOWNLOADS PAGE
   ======================================== */
.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}

.download-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  transition: all 0.3s ease;
  position: relative;
}

.download-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.download-card-logo {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 18px;
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}

.download-card-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: 8px;
}

.download-card-body {
  flex: 1;
  min-width: 0;
}

.download-card-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
}

.download-card-top h3 {
  font-size: 1.15rem;
  margin: 0;
}

.download-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.download-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.download-meta .platform-tag,
.download-meta .version-tag,
.download-meta .size-tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.platform-windows {
  background: #0078d7;
  color: #fff;
}

.platform-macos {
  background: #555555;
  color: #fff;
}

.platform-linux {
  background: #f7931e;
  color: #fff;
}

.platform-android {
  background: #3ddc84;
  color: #1a1a1a;
}

.platform-ios {
  background: #000000;
  color: #fff;
}

.version-tag {
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.size-tag {
  background: var(--bg-secondary);
  color: var(--text-muted);
}

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

/* Tags */
.tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.tag-new {
  background: var(--accent);
  color: #fff;
}

.tag-beta {
  background: #f59e0b;
  color: #fff;
}

.tag-stable {
  background: #6366f1;
  color: #fff;
}

/* Dropdown for multi-platform downloads */
.dropdown-group {
  position: relative;
  display: inline-block;
}

.dropdown-toggle {
  cursor: pointer;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
  margin-top: 4px;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-menu a {
  display: block;
  padding: 0.6rem 1rem;
  color: var(--text-primary);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.2s ease;
}

.dropdown-menu a:hover {
  background: var(--bg-card-hover);
  color: var(--accent);
}

@media (max-width: 768px) {
  .downloads-grid {
    grid-template-columns: 1fr;
  }

  .download-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .download-card-logo {
    width: 64px;
    height: 64px;
    padding: 5px;
    border-radius: 14px;
  }

  .download-actions {
    justify-content: center;
  }

  .download-card-top {
    justify-content: center;
  }

  .download-meta {
    justify-content: center;
  }
}

/* ========================================
   ABOUT PAGE
   ======================================== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.stat-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.stat-card .stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card .stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ========================================
   CONTACT PAGE
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

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

.contact-form {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
  background: var(--bg-footer);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  color: var(--text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.95rem;
  max-width: 320px;
}

.footer h4 {
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-links a {
  display: block;
  padding: 0.3rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-social {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: all 0.25s ease;
}

.footer-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 2.8rem;
  }

  .hero-content p {
    margin: 0 auto 2rem;
    max-width: 600px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    display: flex;
    justify-content: center;
  }

  .hero-cover {
    max-width: 400px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: var(--bg-nav);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.3s ease;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }

  .hamburger {
    display: flex;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-visual {
    margin-top: 2rem;
  }

  .hero-cover {
    max-width: 320px;
  }

  .section-title {
    font-size: 1.8rem;
  }

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

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

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

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .page-header h1 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .container {
    padding: 0 16px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   APP CARD DOWNLOAD ICON & EXPAND
   ======================================== */
.app-card-footer {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
  margin-top: 1rem;
}

.download-icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--accent);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
  margin-left: auto;
  box-shadow: var(--shadow);
}

.download-icon-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

.download-icon-btn.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.app-downloads {
  display: none;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  width: 100%;
  animation: fadeInUp 0.3s ease forwards;
}

.app-downloads.open {
  display: flex;
}

.app-downloads .btn-sm {
  font-size: 0.8rem;
  padding: 0.4rem 1rem;
}

.app-downloads .unavailable {
  opacity: 0.6;
  cursor: default !important;
  pointer-events: none;
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-in-delay-1 {
  animation-delay: 0.1s;
}

.animate-in-delay-2 {
  animation-delay: 0.2s;
}

.animate-in-delay-3 {
  animation-delay: 0.3s;
}

.animate-in-delay-4 {
  animation-delay: 0.4s;
}

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

.mt-1 {
  margin-top: 1rem;
}

.mt-2 {
  margin-top: 2rem;
}

.mt-3 {
  margin-top: 3rem;
}

.mb-1 {
  margin-bottom: 1rem;
}

.mb-2 {
  margin-bottom: 2rem;
}