/* ═══════════════════════════════════════════════════════════════════════════
   ䷝ 杜坚持 — 全局样式
   风格: 新中式雅致 · 配色 "晚霞温润"
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── CSS 变量 ─────────────────────────────────────────────────────────── */
:root {
  /* 配色：晚霞温润 */
  --color-primary:      #B83A3A;  /* 砖红 — 主色 */
  --color-secondary:    #D4726A;  /* 暖粉 — 辅色 */
  --color-accent:       #E8C4A8;  /* 米色 — 强调 */
  --color-dark:         #2D2D2D;  /* 深灰 — 文字 */
  --color-bg:           #FAF6F1;  /* 象牙白 — 背景 */
  --color-card:         #FFFFFF;  /* 卡片白 */
  --color-border:       #E8C4A8;  /* 边框 */
  --color-success:      #6B8E6B;  /* 成功绿 */
  --color-danger:       #B83A3A;
  --color-warn:         #C99A4A;

  /* 派生色 — 半透明调整 */
  --color-primary-10:   rgba(184, 58, 58, 0.10);
  --color-secondary-10: rgba(212, 114, 106, 0.10);
  --color-border-soft:  rgba(232, 196, 168, 0.55);
  --color-shadow-1:     0 2px 12px rgba(0, 0, 0, 0.06);
  --color-shadow-2:     0 8px 24px rgba(184, 58, 58, 0.12);
  --color-shadow-3:     0 14px 40px rgba(0, 0, 0, 0.10);

  /* 字体 */
  --font-serif:  "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans:   system-ui, -apple-system, "Segoe UI", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono:   "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* 间距 */
  --gap-1: 0.5rem;
  --gap-2: 1rem;
  --gap-3: 1.5rem;
  --gap-4: 2rem;
  --gap-5: 3rem;
  --gap-6: 4rem;
  --gap-7: 6rem;

  /* 圆角 */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-pill: 999px;

  /* 容器宽度 */
  --container-max: 1200px;
  --header-height: 64px;

  /* 过渡 */
  --easing: cubic-bezier(0.2, 0.7, 0.2, 1);
  --duration: 240ms;
}

/* ─── 基础重置 ─────────────────────────────────────────────────────────── */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-dark);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-dark);
  margin: 0 0 var(--gap-3);
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p { margin: 0 0 var(--gap-3); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration) var(--easing);
}
a:hover { color: var(--color-secondary); }

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

button { font-family: inherit; cursor: pointer; }

ul { list-style: none; padding: 0; margin: 0; }

code, .mono { font-family: var(--font-mono); font-size: 0.9em; }

main { flex: 1; }

/* ─── 公共布局 ─────────────────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gap-3);
}

.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: var(--gap-6);
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  letter-spacing: 0.5em;
  color: var(--color-secondary);
  text-transform: uppercase;
  padding-left: 0.5em; /* 视觉修正：letter-spacing 让首尾不对称 */
  margin-bottom: var(--gap-2);
}

.section-title {
  margin: 0 0 var(--gap-3);
  position: relative;
  display: inline-block;
}

.section-lead {
  max-width: 640px;
  margin: var(--gap-3) auto 0;
  color: rgba(45, 45, 45, 0.75);
}

/* 分隔装饰：细线 + 小圆点 */
.section-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: var(--gap-3);
}
.divider-line {
  display: block;
  width: 60px;
  height: 1px;
  background: var(--color-border);
}
.divider-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-secondary);
  box-shadow: 0 0 0 3px var(--color-bg), 0 0 0 4px var(--color-border);
}

/* 卡片基础 */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--color-shadow-1);
  padding: var(--gap-4);
  transition: transform var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--color-shadow-2);
}

.empty-state {
  text-align: center;
  color: rgba(45, 45, 45, 0.55);
  padding: var(--gap-6) var(--gap-3);
  font-style: italic;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.4);
}

/* ─── 导航栏 ───────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 246, 241, 0.82);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--color-border-soft);
  transition: background var(--duration) var(--easing);
}
.site-header.scrolled { background: rgba(250, 246, 241, 0.96); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark);
}
.brand-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-card);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: transform var(--duration) var(--easing);
}
.brand:hover .brand-glyph { transform: rotate(-8deg) scale(1.05); }

.primary-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--gap-3);
}

.nav-list a {
  display: inline-block;
  padding: 0.4rem 0.2rem;
  font-size: 0.95rem;
  color: var(--color-dark);
  position: relative;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--color-primary);
  transition: right var(--duration) var(--easing);
}
.nav-list a:hover { color: var(--color-primary); }
.nav-list a:hover::after { right: 0; }

.nav-divider {
  width: 1px; height: 16px;
  background: var(--color-border);
}

.nav-admin {
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 0.4rem;
  width: 40px; height: 40px;
  flex-direction: column;
  justify-content: space-around;
}
.nav-toggle-bar {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-dark);
  border-radius: 1px;
  transition: transform var(--duration) var(--easing),
              opacity var(--duration) var(--easing);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ─── Hero 区 ─────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  isolation: isolate;
  padding: clamp(4rem, 12vw, 8rem) 0 clamp(4rem, 10vw, 7rem);
  text-align: center;
  overflow: hidden;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse at 20% 10%, var(--color-secondary), transparent 55%),
    radial-gradient(ellipse at 85% 80%, var(--color-primary), transparent 60%),
    linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg,
      rgba(255,255,255,0.04) 0 2px,
      transparent 2px 16px);
}

.hero-deco {
  position: absolute;
  top: var(--gap-3);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--gap-2);
  z-index: -1;
  color: rgba(255, 255, 255, 0.5);
}
.deco-line {
  display: block;
  width: 48px;
  height: 1px;
  background: currentColor;
}
.deco-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.hero-inner {
  position: relative;
}

.hero-glyph {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: clamp(4rem, 10vw, 6rem);
  font-weight: 700;
  color: var(--color-bg);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  margin-bottom: var(--gap-3);
  animation: glyph-pulse 4s ease-in-out infinite;
}
@keyframes glyph-pulse {
  0%, 100% { transform: translateY(0); text-shadow: 0 4px 24px rgba(0,0,0,0.25); }
  50%      { transform: translateY(-6px); text-shadow: 0 12px 32px rgba(0,0,0,0.35); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin: 0 0 var(--gap-2);
  color: var(--color-bg);
  letter-spacing: 0.1em;
  font-weight: 700;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.4rem);
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 var(--gap-4);
  letter-spacing: 0.15em;
}

.hero-desc {
  max-width: 560px;
  margin: 0 auto var(--gap-5);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--gap-3);
}

.hero-scroll {
  position: absolute;
  bottom: var(--gap-3);
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  color: rgba(255, 255, 255, 0.7);
}
.hero-scroll-line {
  display: block;
  width: 1px; height: 36px;
  background: currentColor;
  position: relative;
  overflow: hidden;
}
.hero-scroll-line::after {
  content: "";
  position: absolute;
  top: -10px; left: 0; right: 0;
  height: 10px;
  background: var(--color-bg);
  animation: scroll-down 1.8s ease-in-out infinite;
}
@keyframes scroll-down {
  0%   { top: -10px; }
  100% { top: 100%; }
}

/* ─── About 区 ────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-4);
}

.about-card {
  text-align: center;
}
.about-icon {
  font-size: 2.2rem;
  margin-bottom: var(--gap-2);
  display: inline-flex;
  width: 64px; height: 64px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-10);
  border: 1px solid var(--color-border-soft);
}
.about-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--gap-2);
}

/* ─── Skills 区 ────────────────────────────────────────────────────────── */
.skills { background: linear-gradient(180deg, transparent, rgba(232, 196, 168, 0.08)); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap-3);
}

.skill-card {
  text-align: center;
  padding: var(--gap-4) var(--gap-3);
}
.skill-icon {
  display: inline-flex;
  width: 56px; height: 56px;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-10), var(--color-secondary-10));
  border: 1px solid var(--color-border-soft);
  margin-bottom: var(--gap-2);
}
.skill-name {
  font-size: 1.05rem;
  margin: 0 0 var(--gap-1);
  color: var(--color-dark);
}
.skill-desc {
  font-size: 0.92rem;
  color: rgba(45, 45, 45, 0.7);
  margin: 0;
}

/* ─── Projects 区 ─────────────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-4);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--gap-2);
}
.project-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin: 0;
  color: var(--color-primary);
}
.project-desc {
  flex: 1;
  color: rgba(45, 45, 45, 0.8);
  font-size: 0.95rem;
  margin: 0;
}
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tech-tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  font-size: 0.78rem;
  border-radius: var(--radius-pill);
  background: var(--color-primary-10);
  color: var(--color-primary);
  border: 1px solid var(--color-border-soft);
}
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 600;
  font-size: 0.95rem;
  align-self: flex-start;
}

/* ─── Guestbook 区 ────────────────────────────────────────────────────── */
.guestbook-form {
  margin-bottom: var(--gap-5);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-3);
}
.form-field {
  margin-bottom: var(--gap-3);
}
.form-field label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--color-dark);
}
.required { color: var(--color-primary); }
.optional { color: rgba(45, 45, 45, 0.5); font-weight: normal; font-size: 0.85em; }

.form-field input[type="text"],
.form-field input[type="email"],
.form-field input[type="url"],
.form-field input[type="password"],
.form-field input[type="number"],
.form-field textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-dark);
  transition: border-color var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing);
}
.form-field input:focus,
.form-field textarea:focus {
  outline: 0;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-10);
}
.form-field textarea { resize: vertical; min-height: 120px; }
.form-hint {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.82rem;
  color: rgba(45, 45, 45, 0.55);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: var(--gap-3);
  flex-wrap: wrap;
}
.form-status {
  margin: 0;
  font-size: 0.92rem;
}
.form-status.success { color: var(--color-success); }
.form-status.error   { color: var(--color-danger); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration) var(--easing),
              background var(--duration) var(--easing),
              color var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing),
              opacity var(--duration) var(--easing);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-card);
  box-shadow: var(--color-shadow-1);
}
.btn-primary:hover { box-shadow: var(--color-shadow-2); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.18);
  color: var(--color-card);
  border-color: rgba(255, 255, 255, 0.6);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.28); }

/* 后台管理区域的 btn-ghost（底色浅，需深色文字） */
.admin-content .btn-ghost {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: transparent;
}
.admin-content .btn-ghost:hover {
  background: var(--color-primary-10);
}

.btn-block { width: 100%; padding: 0.8rem; font-size: 1rem; }
.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.85rem; }

.btn-danger {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-danger:hover {
  background: var(--color-primary);
  color: var(--color-card);
}

/* guestbook 内的 btn-ghost 应该用深色文字 */
.guestbook .btn-ghost,
.admin-form .btn-ghost,
.auth-form .btn-ghost {
  color: var(--color-dark);
  background: transparent;
  border-color: var(--color-border);
}
.guestbook .btn-ghost:hover,
.admin-form .btn-ghost:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.btn-spinner {
  display: none;
  width: 14px; height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.btn.loading .btn-spinner { display: inline-block; }
.btn.loading .btn-label { opacity: 0.6; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 留言列表 */
.message-list {
  display: grid;
  gap: var(--gap-3);
}
.message-item {
  display: flex;
  gap: var(--gap-3);
  align-items: flex-start;
}
.message-avatar {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-card);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
}
.message-body { flex: 1; min-width: 0; }
.message-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.3rem;
}
.message-name {
  font-family: var(--font-serif);
  color: var(--color-dark);
  font-size: 1rem;
}
.message-time {
  font-size: 0.8rem;
  color: rgba(45, 45, 45, 0.55);
  font-family: var(--font-mono);
}
.message-content {
  margin: 0;
  color: rgba(45, 45, 45, 0.85);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ─── Footer ───────────────────────────────────────────────────────────── */
.site-footer {
  margin-top: var(--gap-6);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: rgba(255, 255, 255, 0.92);
  padding: var(--gap-5) 0 var(--gap-3);
}
.site-footer .brand-glyph { width: 28px; height: 28px; font-size: 1.1rem; }
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-2);
  text-align: center;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
}
.footer-copy { margin: 0; font-size: 0.92rem; }
.footer-meta { margin: 0; font-size: 0.85rem; opacity: 0.7; }
.footer-heart { color: var(--color-secondary); }

/* ═══════════════════════════════════════════════════════════════════════════
   后台管理样式
   ═══════════════════════════════════════════════════════════════════════════ */

.admin-body {
  background: var(--color-bg);
}

.admin-shell {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏 */
.admin-sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--color-card);
  border-right: 1px solid var(--color-border-soft);
  padding: var(--gap-4) 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.admin-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0 var(--gap-3);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-dark);
  margin-bottom: var(--gap-4);
}
.admin-brand .brand-glyph { width: 32px; height: 32px; font-size: 1.3rem; }

.admin-nav ul { padding: 0; }
.admin-nav li { padding: 0 var(--gap-2); }
.admin-nav a,
.admin-nav button {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem var(--gap-2);
  font-size: 0.95rem;
  color: var(--color-dark);
  border-radius: var(--radius-sm);
  background: transparent;
  border: 0;
  width: 100%;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
}
.admin-nav a:hover,
.admin-nav button:hover {
  background: var(--color-primary-10);
  color: var(--color-primary);
}
.admin-nav a.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-card);
  font-weight: 600;
}
.admin-nav-icon {
  display: inline-block;
  width: 20px;
  text-align: center;
  font-size: 1.05rem;
}
.admin-nav-sep {
  height: 1px;
  background: var(--color-border-soft);
  margin: var(--gap-2);
  padding: 0;
}

.admin-logout-form { padding: 0; margin: 0; }
.admin-logout-btn { font-size: 0.95rem; }

/* 主内容 */
.admin-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.admin-topbar {
  display: flex;
  align-items: center;
  gap: var(--gap-3);
  padding: var(--gap-3) var(--gap-4);
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}
.admin-page-title {
  margin: 0;
  font-size: 1.4rem;
  flex: 1;
}
.admin-topbar-right { min-width: 40px; }

.admin-sidebar-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 40px; height: 40px;
  padding: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}
.admin-sidebar-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-dark);
}

.admin-content {
  padding: var(--gap-4);
  flex: 1;
}

/* 仪表盘统计卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--gap-3);
  margin-bottom: var(--gap-4);
}
.stat-card {
  display: flex;
  align-items: center;
  gap: var(--gap-3);
}
.stat-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  font-size: 1.4rem;
  border-radius: var(--radius-md);
  background: var(--color-primary-10);
  color: var(--color-primary);
  flex-shrink: 0;
}
.stat-card-warn .stat-icon { background: rgba(201, 154, 74, 0.12); color: var(--color-warn); }
.stat-body { display: flex; flex-direction: column; }
.stat-value { font-size: 1.8rem; font-weight: 700; font-family: var(--font-serif); }
.stat-label { font-size: 0.88rem; color: rgba(45,45,45,0.6); }

.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--gap-3);
}
.quick-card {
  display: flex;
  align-items: center;
  gap: var(--gap-2);
  text-decoration: none;
  color: var(--color-dark);
  padding: var(--gap-3);
}
.quick-card:hover { color: var(--color-primary); }
.quick-icon {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-primary-10);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.1rem;
}

/* 数据表格 */
.toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--gap-3);
}
.data-table-wrap {
  background: var(--color-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--color-shadow-1);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
}
.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-soft);
}
.data-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-dark);
  font-family: var(--font-serif);
  letter-spacing: 0.05em;
}
.data-table tbody tr:hover { background: var(--color-bg); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.th-actions, .td-actions {
  text-align: right;
  white-space: nowrap;
}
.td-sub {
  font-size: 0.85rem;
  color: rgba(45,45,45,0.6);
  margin-top: 0.2rem;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.td-content {
  max-width: 280px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.td-time, .td-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: rgba(45,45,45,0.7);
}
.link-external {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-dark);
}
.link-external:hover { background: var(--color-primary-10); color: var(--color-primary); }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.78rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
}
.badge-success {
  background: rgba(107, 142, 107, 0.16);
  color: var(--color-success);
}
.badge-warn {
  background: rgba(201, 154, 74, 0.16);
  color: var(--color-warn);
}

/* 表单 */
.admin-form {
  background: var(--color-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: var(--gap-4);
  max-width: 720px;
  box-shadow: var(--color-shadow-1);
}
.admin-form .form-field-narrow { max-width: 200px; }
.form-fieldset {
  border: 0;
  padding: 0;
  margin: var(--gap-4) 0 var(--gap-3);
}
.form-fieldset legend {
  font-family: var(--font-serif);
  font-weight: 600;
  padding: 0;
  margin-bottom: var(--gap-3);
  font-size: 1.05rem;
}
.form-switch {
  display: flex;
  align-items: flex-start;
  gap: var(--gap-2);
  padding: var(--gap-2);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  margin-bottom: var(--gap-2);
  background: var(--color-bg);
}
.form-switch input[type="checkbox"] {
  width: 18px; height: 18px;
  margin-top: 0.2rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.form-switch label {
  margin: 0;
  flex: 1;
  cursor: pointer;
}
.form-actions-row { margin-top: var(--gap-4); }

.alert {
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--gap-3);
  border: 1px solid transparent;
}
.alert-error {
  background: rgba(184, 58, 58, 0.1);
  color: var(--color-danger);
  border-color: var(--color-primary);
}
.alert-success {
  background: rgba(107, 142, 107, 0.12);
  color: var(--color-success);
  border-color: var(--color-success);
}

/* 认证页 */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gap-4);
  background:
    radial-gradient(ellipse at top, rgba(212, 114, 106, 0.18), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(184, 58, 58, 0.12), transparent 60%),
    var(--color-bg);
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--color-shadow-2);
  padding: var(--gap-5) var(--gap-4);
}
.auth-head { text-align: center; margin-bottom: var(--gap-4); }
.auth-glyph {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 56px; height: 56px;
  font-family: var(--font-serif); font-size: 1.8rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-card);
  border-radius: 50%;
  margin-bottom: var(--gap-2);
}
.auth-title { margin: 0 0 0.3rem; font-size: 1.4rem; }
.auth-sub { color: rgba(45,45,45,0.65); font-size: 0.93rem; margin: 0; }
.auth-form { margin-top: var(--gap-3); }
.auth-foot { text-align: center; margin: var(--gap-3) 0 0; font-size: 0.88rem; }
.link-btn {
  background: none;
  border: 0;
  color: var(--color-primary);
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
}
.link-btn:hover { color: var(--color-secondary); }

.totp-input {
  font-family: var(--font-mono);
  font-size: 1.5rem !important;
  text-align: center;
  letter-spacing: 0.5em;
  padding: 0.8rem !important;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   动画
   ═══════════════════════════════════════════════════════════════════════════ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms var(--easing), transform 600ms var(--easing);
}
.fade-in.in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  .hero-glyph, .hero-scroll-line::after { animation: none; }
  html { scroll-behavior: auto; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   响应式
   Breakpoints: 768px / 1024px / 1440px
   ═══════════════════════════════════════════════════════════════════════════ */

/* 1024px */
@media (max-width: 1024px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 768px */
@media (max-width: 768px) {
  :root { --header-height: 56px; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }

  /* 导航：折叠成 hamburger */
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-soft);
    box-shadow: var(--color-shadow-1);
  }
  .primary-nav.open { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--gap-2) 0;
  }
  .nav-list a {
    display: block;
    padding: 0.7rem var(--gap-3);
  }
  .nav-list a::after { display: none; }
  .nav-divider { display: none; }
  .nav-list a:hover { background: var(--color-primary-10); }

  /* Projects 单列 */
  .projects-grid { grid-template-columns: 1fr; }

  /* Guestbook 表单单列 */
  .form-row { grid-template-columns: 1fr; }

  /* 后台：侧边栏折叠 */
  .admin-sidebar {
    position: fixed;
    top: 0; bottom: 0;
    left: 0;
    transform: translateX(-100%);
    width: 240px;
    z-index: 50;
    transition: transform var(--duration) var(--easing);
    box-shadow: var(--color-shadow-3);
  }
  .admin-sidebar.open { transform: translateX(0); }
  .admin-sidebar-toggle { display: inline-flex; }
  .admin-content { padding: var(--gap-3); }

  /* 数据表格：横向滚动 */
  .data-table-wrap { overflow-x: auto; }
  .data-table { min-width: 600px; }

  /* Hero 渐弱 */
  .hero-glyph { font-size: 4rem; }
}

/* 1440px 以上：更宽的容器 */
@media (min-width: 1440px) {
  :root { --container-max: 1320px; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   打印样式（可选）
   ═══════════════════════════════════════════════════════════════════════════ */
@media print {
  .site-header, .site-footer, .hero, .nav-toggle, .admin-sidebar, .admin-topbar { display: none; }
  body { color: #000; background: #fff; }
  .card { box-shadow: none; border: 1px solid #ccc; }
  a { color: #000; text-decoration: underline; }
}