/* ===========================
   Custom Properties
   =========================== */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-bg-card: #ffffff;
  --color-text: #1d1d1f;
  --color-text-muted: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-border: #d2d2d7;
  --color-white: #1d1d1f;

  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --max-width: 960px;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

/* ===========================
   Layout
   =========================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

main {
  flex: 1;
}

/* ===========================
   Header
   =========================== */
header.site-header {
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

header.site-header .brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.02em;
}

header.site-header nav {
  display: flex;
  gap: var(--space-lg);
}

header.site-header nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

header.site-header nav a:hover,
header.site-header nav a[aria-current="page"] {
  color: var(--color-white);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.hero-gradient {
  background: linear-gradient(180deg, #eef4ff 0%, var(--color-bg) 100%);
  padding: 5rem 0 var(--space-3xl);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto;
}

.hero-platforms {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.hero-platform {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
}

/* ===========================
   Section
   =========================== */
.section {
  padding: var(--space-2xl) 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-xl);
  text-align: center;
}

/* ===========================
   App Cards Grid
   =========================== */
.app-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .app-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===========================
   App Card
   =========================== */
.app-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.app-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.app-card-top {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.app-card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #0071e3, #005bb5);
  flex-shrink: 0;
  overflow: hidden;
}

.app-card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-card-info h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.app-card-description {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.app-card-screenshot {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
  max-height: 200px;
}

.app-card-screenshot img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: top;
}

.app-card-actions {
  margin-top: auto;
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.app-card-actions a {
  display: inline-flex;
  align-items: center;
}

.btn-learn-more {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: background-color 0.2s, color 0.2s;
}

.btn-learn-more:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* ===========================
   App Store Badge
   =========================== */
.app-store-badge {
  height: 40px;
  transition: opacity 0.2s;
}

.app-store-badge:hover {
  opacity: 0.85;
}

/* ===========================
   Product Page
   =========================== */
.product-hero {
  padding: var(--space-3xl) 0 var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.product-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #0071e3, #005bb5);
  flex-shrink: 0;
  overflow: hidden;
}

.product-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-meta h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.product-meta .subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: var(--space-md);
}

.product-section {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}

.product-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.product-section p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.product-section ul {
  list-style: none;
  padding: 0;
}

.product-section li {
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.product-section li::before {
  content: "•";
  color: var(--color-accent);
  position: absolute;
  left: 0;
  font-weight: 700;
}

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

.tag {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===========================
   Screenshot Gallery
   =========================== */
.screenshots {
  display: flex;
  gap: var(--space-lg);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-md);
}

.screenshots img {
  scroll-snap-align: start;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  height: 400px;
  width: auto;
  flex-shrink: 0;
}

.screenshots img.screenshot-ipad {
  height: 300px;
}

.screenshots-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

/* ===========================
   Support List
   =========================== */
.support-list {
  list-style: none;
  padding: 0;
}

.support-list li {
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.support-list li::before {
  content: "•";
  color: var(--color-accent);
  position: absolute;
  left: 0;
  font-weight: 700;
}

/* ===========================
   About Page
   =========================== */
.about-content {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-3xl) 0;
}

.about-content h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
}

.about-content h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.about-content p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

/* ===========================
   Footer
   =========================== */
footer.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-3xl);
}

footer.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

footer.site-footer .copyright {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

footer.site-footer nav {
  display: flex;
  gap: var(--space-lg);
}

footer.site-footer nav a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

footer.site-footer nav a:hover {
  color: var(--color-white);
}

/* ===========================
   Intro Section
   =========================== */
.intro-section {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3xl) 0;
}

.intro {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.intro p {
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: 1.05rem;
}

/* ===========================
   App Themes
   =========================== */
body[data-theme="steel-dark"] {
  --color-bg: #1a1a1e;
  --color-bg-secondary: #121214;
  --color-bg-card: #232328;
  --color-text: #d4d4d8;
  --color-text-muted: #9a9aa0;
  --color-accent: #e5a51b;
  --color-accent-hover: #f0b830;
  --color-border: #333338;
  --color-white: #f4f4f5;
}

body[data-theme="livesick-dark"] {
  --color-bg: #1a1a1e;
  --color-bg-secondary: #121214;
  --color-bg-card: #232328;
  --color-text: #d4d4d8;
  --color-text-muted: #9a9aa0;
  --color-accent: #e8a520;
  --color-accent-hover: #f5b63a;
  --color-border: #333338;
  --color-white: #f4f4f5;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 480px) {
  .product-hero {
    flex-direction: column;
    text-align: center;
  }

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