/* ==========================================================================
   个人主页 · 设计系统
   风格参照 owngoal.dev —— 极简单色 / 明暗双主题 / 卡片网格 / 依次入场
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 字体 */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "PingFang SC", "Helvetica Neue", ui-sans-serif, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 中性色阶 */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;
  --neutral-950: #0a0a0a;

  /* 语义色（浅色主题为默认值） */
  --bg: var(--neutral-50);
  --fg: var(--neutral-900);
  --surface: #ffffff;
  --border: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.3);
  --border-hairline: rgba(0, 0, 0, 0.05);
  --muted: var(--neutral-500);
  --muted-soft: var(--neutral-400);
  --nav-fg: var(--neutral-600);
  --nav-fg-hover: var(--neutral-900);
  --icon-fg: var(--neutral-300);
  --icon-fg-hover: var(--neutral-900);
  --letter-bg: var(--neutral-100);
  --letter-fg: var(--neutral-400);
  --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  --link-underline: var(--neutral-300);
  --logo-filter: none;

  /* 尺寸节奏 */
  --shell: 64rem;   /* max-w-5xl  外框 */
  --content: 48rem; /* max-w-3xl  内容区 */
  --radius: 0.75rem; /* rounded-xl */

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* 跟随系统深色 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: var(--neutral-950);
    --fg: var(--neutral-50);
    --surface: var(--neutral-900);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.3);
    --border-hairline: rgba(255, 255, 255, 0.05);
    --muted: var(--neutral-400);
    --muted-soft: var(--neutral-500);
    --nav-fg: var(--neutral-300);
    --nav-fg-hover: #ffffff;
    --icon-fg: var(--neutral-600);
    --icon-fg-hover: var(--neutral-50);
    --letter-bg: var(--neutral-800);
    --letter-fg: var(--neutral-500);
    --card-shadow: none;
    --link-underline: var(--neutral-600);
    --logo-filter: invert(1);
  }
}

/* 手动锁定深色 */
:root[data-theme="dark"] {
  --bg: var(--neutral-950);
  --fg: var(--neutral-50);
  --surface: var(--neutral-900);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.3);
  --border-hairline: rgba(255, 255, 255, 0.05);
  --muted: var(--neutral-400);
  --muted-soft: var(--neutral-500);
  --nav-fg: var(--neutral-300);
  --nav-fg-hover: #ffffff;
  --icon-fg: var(--neutral-600);
  --icon-fg-hover: var(--neutral-50);
  --letter-bg: var(--neutral-800);
  --letter-fg: var(--neutral-500);
  --card-shadow: none;
  --link-underline: var(--neutral-600);
  --logo-filter: invert(1);
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  border: 0 solid;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  font-size: inherit;
  font-weight: inherit;
}

ul {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 3. 跳转到主内容（无障碍） ---------- */
.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 50;
  transform: translateY(-6rem);
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.875rem;
  font-weight: 500;
  transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 4. 顶栏 ---------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand__logo {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  object-fit: cover;
  filter: var(--logo-filter);
}

.brand__name {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 13px;
  font-weight: 500;
  color: var(--nav-fg);
}

.nav a {
  transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav a:hover {
  color: var(--nav-fg-hover);
}

/* 主题切换按钮 */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--nav-fg);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, transform 0.15s;
}

.theme-toggle:hover {
  color: var(--nav-fg-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.theme-toggle svg {
  width: 14px;
  height: 14px;
}

/* ---------- 5. 主区域与首屏 ---------- */
main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero {
  padding-top: 3.5rem;
  padding-bottom: 4rem;
  text-align: center;
}

.hero__title {
  max-width: 100%;
  margin: 0 auto;
  font-size: clamp(1.3rem, 2.9vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.hero__subtitle {
  margin: 0.875rem auto 0;
  max-width: 32rem;
  font-size: 0.9375rem;
  color: var(--muted);
  text-wrap: pretty;
}

@media (min-width: 640px) {
  .hero {
    padding-top: 5rem;
  }
}

@media (min-width: 768px) {
  .hero__title {
    white-space: nowrap;
  }
}

/* ---------- 6. 分组区块 ---------- */
.groups {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  max-width: var(--content);
  margin: 0 auto;
  padding-bottom: 2rem;
}

.group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.group__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.group__count {
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted-soft);
}

.group__desc {
  margin: -0.5rem 0 1rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 7. 卡片 ---------- */
.card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-0.125rem);
  border-color: var(--border-strong);
  box-shadow: var(--card-shadow);
}

/* 无外链的作品（如微信小程序）：不响应悬停，避免暗示可点击 */
.card--static {
  cursor: default;
}

.card--static:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: none;
}

.card__icon {
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  border-radius: 10px;
  border: 1px solid var(--border-hairline);
  object-fit: cover;
}

.card__icon--letter {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--letter-bg);
  color: var(--letter-fg);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  user-select: none;
}

.card__body {
  min-width: 0;
  flex: 1;
}

.card__title {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 15px;
  font-weight: 600;
}

.card__meta {
  display: block;
  margin-top: 0.125rem;
  font-size: 13px;
  color: var(--muted);
}

.card__arrow {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  color: var(--icon-fg);
  transition: color 0.2s;
}

.card:hover .card__arrow {
  color: var(--icon-fg-hover);
}

/* 大卡（带预览图，跨两列） */
.card--featured {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 0;
  overflow: hidden;
}

@media (min-width: 640px) {
  .card--featured {
    grid-column: span 2;
  }
}

.card__cover {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--border-hairline);
  background: var(--letter-bg);
}

.card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease-out-expo);
}

.card--featured:hover .card__cover img {
  transform: scale(1.03);
}

.card--featured .card__row {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
}

/* ---------- 8. 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-hairline);
  padding: 2.5rem 0;
  text-align: center;
  font-size: 13px;
  color: var(--muted-soft);
}

.footer a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: var(--link-underline);
  text-underline-offset: 4px;
  transition: color 0.15s;
}

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

.footer__sign {
  margin-bottom: 1rem;
  font-size: 15px;
  font-style: italic;
  color: var(--muted);
  text-wrap: balance;
}

.footer__links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.footer__copy {
  margin-top: 1.25rem;
  font-size: 12px;
  color: var(--muted-soft);
}

.footer__sep {
  margin: 0 0.5rem;
  opacity: 0.6;
}

.footer__c {
  margin-right: 0.15em;
}

/* ---------- 9. 入场动效 ---------- */
.reveal {
  animation: reveal-in 0.7s var(--ease-out-expo) both;
}

@keyframes reveal-in {
  from {
    opacity: 0;
    transform: translateY(0.85rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    animation: none;
  }
  .card,
  .card__cover img {
    transition: none;
  }
}

/* ---------- 10. 滚动条 ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border: 3px solid var(--bg);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}