/* SYLEN 官网 — Apple 风格设计
   浅色底、#1D1D1F 文本、#0071E3 蓝色强调、SF Pro 字体、大留白与圆角 */

:root {
  color-scheme: light;
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #86868b;
  --color-blue: #0071e3;
  --color-blue-hover: #0077ed;
  --color-link: #06c;
  --color-fill-btn: #e8e8ed;
  --color-fill-btn-hover: #dedee3;
  --color-border: #d2d2d7;
  --color-green: #248a3d;
  --color-red: #c41e2a;
  --page-pad: clamp(1.25rem, 4vw, 4rem);
  --section-pad: clamp(3.5rem, 8vw, 6rem);
  --max-width: 76rem;
  --font-stack:
    -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue',
    'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(0, 113, 227, 0.18);
  color: var(--color-text);
}

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

a:hover {
  text-decoration: underline;
}

.page-shell {
  padding-inline: var(--page-pad);
}

.container {
  width: min(var(--max-width), 100%);
  margin-inline: auto;
}

/* ── Top bar（毛玻璃导航） ── */

.top-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 0.15rem;
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.wordmark:hover {
  color: var(--color-text);
  text-decoration: none;
}

.wordmark em {
  font-style: normal;
  color: var(--color-blue);
}

.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.anchor-nav a {
  color: inherit;
  text-decoration: none;
}

.anchor-nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 1.4rem;
  border-radius: 980px;
  border: none;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--color-blue);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-blue-hover);
  color: #ffffff;
}

.btn-glass {
  background: var(--color-fill-btn);
  color: var(--color-text);
}

.btn-glass:hover {
  background: var(--color-fill-btn-hover);
  color: var(--color-text);
}

/* ── Cards（玻璃 → 苹果浅灰卡片） ── */

.glass {
  background: var(--color-bg-secondary);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 18px;
}

.glass-raised {
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.interactive-glass {
  cursor: default;
}

.interactive-glass:hover,
.interactive-glass:focus-within {
  border-color: rgba(0, 0, 0, 0.16);
}

/* ── Hero ── */

.hero {
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(4rem, 10vw, 6.5rem);
  background: linear-gradient(180deg, #fbfbfd 0%, #ffffff 60%);
  border-radius: 0 0 2.5rem 2.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: end;
}

.hero-copy h1 {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: 1.25rem;
}

.hero-copy h1 em {
  font-style: normal;
  color: var(--color-blue);
}

.hero-lead {
  max-width: 34rem;
  font-size: clamp(1.0625rem, 2vw, 1.3125rem);
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.hero-description {
  max-width: 34rem;
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-aside {
  display: grid;
  gap: 1rem;
}

/* Version widget */

.widget {
  border-radius: 18px;
  padding: 1.5rem;
}

.widget-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 0.6rem;
}

.widget-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.widget-sub {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.1rem;
}

.progress {
  height: 5px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.08);
  overflow: hidden;
  margin-bottom: 0.55rem;
}

.progress > span {
  display: block;
  height: 100%;
  width: var(--progress, 68%);
  background: var(--color-blue);
  border-radius: inherit;
}

.widget-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  font-variant-numeric: tabular-nums;
}

.widget-note {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.scope-list {
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.scope-list li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding-left: 0.85rem;
  border-left: 2px solid rgba(0, 113, 227, 0.35);
}

/* ── Sections ── */

.section {
  padding-block: var(--section-pad);
}

.section-head {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  max-width: 44rem;
}

.section-head h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.85rem;
}

.section-head p,
.muted {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.section-head p {
  max-width: 40rem;
}

.section-head p strong {
  color: var(--color-text);
}

/* Cards & grids */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  border-radius: 18px;
  padding: 1.65rem;
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.card ul {
  padding-left: 1.1rem;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.card ul li + li {
  margin-top: 0.35rem;
}

.card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Timeline */

.timeline {
  display: grid;
  gap: 0.85rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.25rem;
  padding: 1.35rem 1.5rem;
  border-radius: 18px;
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  font-variant-numeric: tabular-nums;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.timeline-summary {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* Status */

.status-tag {
  display: inline-block;
  margin-bottom: 0.6rem;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status-tag.doing {
  color: var(--color-blue);
  background: rgba(0, 113, 227, 0.1);
}

.status-tag.planned {
  color: var(--color-text-secondary);
  background: var(--color-fill-btn);
}

/* Links & downloads */

.link-list,
.download-grid {
  display: grid;
  gap: 0.75rem;
}

.link-row,
.download-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.35rem;
  border-radius: 16px;
}

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

.download-card.disabled {
  border-style: dashed;
  opacity: 0.7;
}

.link-row-meta {
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  margin-top: 0.15rem;
}

.card a,
.link-row a {
  min-width: 0;
  overflow-wrap: anywhere;
}

.subsection-title {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 0.75rem;
}

.empty-hint {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

.notice {
  margin-top: 1.25rem;
  padding: 1.15rem 1.35rem;
  border-radius: 16px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.notice code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--color-text);
  background: rgba(0, 0, 0, 0.04);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* Footer */

.site-footer {
  padding: clamp(3rem, 7vw, 5rem) 0;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--color-bg-secondary);
  margin-inline: calc(-1 * var(--page-pad));
  margin-bottom: calc(-1 * var(--page-pad));
  padding-left: var(--page-pad);
  padding-right: var(--page-pad);
}

.footer-brand {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1rem;
}

#disclaimer-text {
  max-width: 52rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 0.75rem;
}

.footer-meta {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* ── 功能原理 ── */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.principle-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 1.4rem;
  border-radius: 18px;
}

.principle-card h3 {
  margin: 0.2rem 0 0.7rem;
}

.principle-eyebrow {
  margin: 0;
  color: var(--color-blue);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.principle-summary {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.principle-flow {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.principle-flow li {
  display: grid;
  grid-template-columns: 1.75rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
  color: var(--color-text);
  font-size: 0.86rem;
  line-height: 1.55;
}

.principle-step-index {
  display: inline-flex;
  width: 1.65rem;
  height: 1.65rem;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 113, 227, 0.1);
  color: var(--color-blue);
  font-size: 0.72rem;
  font-weight: 600;
}

.principle-meta {
  display: grid;
  gap: 0.55rem;
  margin: auto 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--color-border);
}

.principle-meta div {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 0.65rem;
}

.principle-meta dt,
.principle-meta dd {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.5;
}

.principle-meta dt {
  color: var(--color-text-tertiary);
}

.principle-meta dd {
  color: var(--color-text-secondary);
}

/* ── 截图展示 ── */

.screenshot-rail {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 1rem;
  /* 隐藏滚动条但保留滚动功能 */
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.15) transparent;
}

.screenshot-rail::-webkit-scrollbar {
  height: 5px;
}

.screenshot-rail::-webkit-scrollbar-track {
  background: transparent;
}

.screenshot-rail::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 999px;
}

.screenshot-item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  width: clamp(260px, 42vw, 560px);
  cursor: pointer;
}

.screenshot-item figure {
  margin: 0;
}

.screenshot-item img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease;
  background: var(--color-bg-secondary);
}

.screenshot-item:hover img {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.13);
}

.screenshot-item figcaption {
  margin-top: 0.65rem;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  text-align: center;
}

/* Lightbox */

.screenshot-lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  cursor: zoom-out;
  animation: lb-in 0.18s ease;
}

@keyframes lb-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.screenshot-lightbox img {
  max-width: min(92vw, 1100px);
  max-height: 88vh;
  border-radius: 14px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  cursor: default;
  object-fit: contain;
}

.screenshot-lightbox-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #fff;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.screenshot-lightbox-close:hover {
  background: rgba(255, 255, 255, 0.28);
}

/* ── Responsive ── */

@media (max-width: 960px) {
  .hero-grid,
  .grid-2,
  .grid-3,
  .timeline-item,
  .principles-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .anchor-nav {
    display: none;
  }

  .screenshot-item {
    width: clamp(240px, 72vw, 400px);
  }
}