/* NineBoxView Pro - Website Styles
   Design Language: Eastern Minimalism (inheriting erikyin.net)

   Color System:
   - Light mode: rice paper (#f8f6f0), ink black (#4a4a4a)
   - Dark mode: ink black (#1a1a1a), rice paper (#f8f6f0)
*/

/* ==================== CSS Variables ==================== */
:root {
  /* Light mode (default) */
  --color-bg: #f8f6f0;
  --color-text: #4a4a4a;
  --color-text-secondary: #6a6a6a;
  --color-border: #d4d4d4;
  --color-accent: #2a2a2a;
  --color-glyphs: #87F32D;
  --color-glyphs-dark: #2C372A;  /* Glyphs 官方深綠色 */

  /* Typography */
  --font-sans: 'IBM Plex Sans', 'Noto Sans TC', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Spacing */
  --max-width: 42rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-text: #f8f6f0;
    --color-text-secondary: #b0b0b0;
    --color-border: #3a3a3a;
    --color-accent: #e0e0e0;
  }
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== Typography ==================== */
h1, h2, h3 {
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.04em;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }

p {
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

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

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

/* ==================== Navigation ==================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav__link {
  text-decoration: none;
  font-size: 0.875rem;
}

.nav__link:hover {
  opacity: 0.7;
}

.lang-switcher {
  display: flex;
  gap: var(--spacing-xs);
  font-size: 0.75rem;
}

.lang-switcher a {
  padding: 0.25rem 0.5rem;
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.lang-switcher a:hover,
.lang-switcher a.active {
  background-color: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

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

.hero__title {
  font-size: 2.5rem;
  letter-spacing: 0.08em;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.hero__subtitle--secondary {
  margin-top: calc(-0.5 * var(--spacing-sm));
  margin-bottom: var(--spacing-md);
}

.hero__image {
  max-width: 100%;
  /* border-radius: 8px; */
  margin: var(--spacing-md) 0;
  /* box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1); */
}

@media (prefers-color-scheme: dark) {
  .hero__image {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  }
}

/* ==================== CTA Button ==================== */
.cta {
  display: inline-block;
  padding: 0.875rem 2rem;
  background-color: var(--color-text);
  color: var(--color-bg);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  font-size: 1rem;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.cta--secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.cta--glyphs {
  background-color: transparent;
  color: var(--color-glyphs-dark);
  border: 1px solid var(--color-glyphs-dark);
}

.cta--glyphs:hover {
  background-color: var(--color-glyphs);
  color: var(--color-glyphs-dark);
  border-color: var(--color-glyphs);
}

/* Coming Soon - visual hint but still clickable for testing */
.cta--coming-soon {
  opacity: 0.6;
}

/* Dark mode: restore bright green for glyphs button */
@media (prefers-color-scheme: dark) {
  .cta--glyphs {
    color: var(--color-glyphs);
    border-color: var(--color-glyphs);
  }

  .cta--glyphs:hover {
    color: #1a1a1a;
  }
}

/* Hero Actions (dual buttons) */
.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.hero__pricing-note {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
}

/* ==================== Features Section ==================== */
.features {
  text-align: center;
}

.features__title {
  margin-bottom: var(--spacing-sm);
}

.features__grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-lg);
}

.feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: left;
}

/* 統一左影片右文字 */

/* 影片/GIF 區域 */
.feature__media {
  flex: 0 0 55%;
  aspect-ratio: 16/9;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--color-border);
}

/* 主要功能區塊（核心功能）較大的影像 */
.features--primary .feature__media {
  flex: 0 0 65%;
  aspect-ratio: 16/10;
}

.features--primary .features__grid {
  gap: var(--spacing-xl);
}

.feature__media img,
.feature__media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

/* Image fallback placeholder */
.feature__placeholder {
  display: none;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-secondary);
}

.feature__media.img-error img {
  display: none;
}

.feature__media.img-error .feature__placeholder {
  display: flex;
}

/* 文字區域 */
.feature__content {
  flex: 1;
}

.feature__title {
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  margin-bottom: var(--spacing-xs);
}

.feature__desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
  line-height: 1.6;
}

/* ==================== Localization Section ==================== */
.localization {
  text-align: center;
}

.localization__image {
  max-width: 100%;
  border-radius: 8px;
  margin: var(--spacing-md) 0;
}

/* ==================== Download Section ==================== */
.download {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
}

.download__title {
  margin-bottom: var(--spacing-md);
}

.download__note {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.download__note a {
  color: var(--color-text-secondary);
}

.download__purchase {
  margin-top: var(--spacing-sm);
}

.download__purchase a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
}

.download__purchase a:hover {
  color: var(--color-text);
  text-decoration: underline;
}

/* ==================== Trust Section ==================== */
.trust {
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.trust__story {
  max-width: 32rem;
  margin: 0 auto var(--spacing-md);
  line-height: 1.8;
}

.trust__features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.trust__feature {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ==================== Footer ==================== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xs);
  list-style: none;
}

.footer__link {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer__link:hover {
  color: var(--color-text);
}

/* ==================== Responsive ==================== */
@media (max-width: 640px) {
  :root {
    --spacing-xl: 4rem;
    --spacing-lg: 3rem;
  }

  h1 { font-size: 2rem; }

  .nav__inner {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  /* Features: 手機版改為上下排列 */
  .feature {
    flex-direction: column;
  }


  .feature__media {
    flex: none;
    width: 100%;
  }

  .feature__content {
    text-align: center;
  }
}

/* ==================== Utilities ==================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ==================== FAQ Section ==================== */
.faq {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

.faq__list {
  margin-top: var(--spacing-md);
  text-align: left;
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
}

.faq__item {
  margin-bottom: var(--spacing-md);
}

.faq__item dt {
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.faq__item dd {
  color: var(--color-text-secondary);
  margin-left: 0;
}