/* ═══════════════════════════════════════════
   我等你 — 纸墨时光 设计系统 v2
   触感阅读体验 · 温暖文学质感
   ═══════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
  /* 纸色调 */
  --paper: #faf7f2;
  --paper-deep: #f3eee5;
  --paper-dark: #e8e0d3;
  --paper-white: #fefdfb;

  /* 墨色 */
  --ink: #2a2218;
  --ink-soft: #4a4038;
  --ink-light: #6b6058;
  --ink-fade: #9b9088;
  --ink-ghost: #c5bdb5;

  /* 朱砂 */
  --seal: #c75b3a;
  --seal-light: #d4785a;
  --seal-dark: #a3442a;
  --seal-glow: rgba(199,91,58,0.08);
  --seal-glow-strong: rgba(199,91,58,0.15);

  /* 语义 */
  --success: #5a8a3c;
  --danger: #b03030;
  --hairline: rgba(42,34,24,0.08);
  --hairline-strong: rgba(42,34,24,0.14);

  /* 阴影（纸的层次） */
  --shadow-sm: 0 1px 2px rgba(42,34,24,0.04);
  --shadow-md: 0 2px 8px rgba(42,34,24,0.06);
  --shadow-lg: 0 4px 16px rgba(42,34,24,0.08);
  --shadow-xl: 0 8px 32px rgba(42,34,24,0.10);

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  /* 动效（pencilplaybook 标准） */
  --ease-enter: cubic-bezier(0, 0, 0.2, 1);
  --ease-exit: cubic-bezier(0.4, 0, 1, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 150ms;
  --dur-normal: 250ms;
  --dur-slow: 350ms;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink-soft);
  background: var(--paper);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ── 纸纹背景 ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    /* 纸纤维纹理 */
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(160,140,100,0.015) 2px,
      rgba(160,140,100,0.015) 3px
    ),
    /* 柔光渐变 */
    radial-gradient(ellipse at 30% 20%, rgba(220,180,140,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(180,140,100,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(255,250,240,0.3) 0%, transparent 70%);
  opacity: 0.8;
}

/* ── 导航栏 ── */
nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250,247,242,0.88);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--hairline);
  padding: 0 var(--space-xl);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: box-shadow var(--dur-normal) var(--ease-standard);
}

nav.scrolled {
  box-shadow: var(--shadow-md);
}

nav .logo {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.25em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

nav .logo .seal-mini {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border: 1.5px solid var(--seal);
  border-radius: 3px;
  color: var(--seal);
  font-size: 0.5rem;
  line-height: 1.1;
  text-align: center;
  opacity: 0.75;
  transform: rotate(-2deg);
  flex-shrink: 0;
}

nav .nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

nav .nav-links a {
  color: var(--ink-light);
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  padding: 4px 0;
  border-bottom: 1.5px solid transparent;
  transition: color var(--dur-fast) var(--ease-standard),
              border-color var(--dur-fast) var(--ease-standard);
}

nav .nav-links a:hover { color: var(--seal); }
nav .nav-links a.active { color: var(--seal); border-bottom-color: var(--seal); }

nav .nav-user {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--ink-fade);
}

/* ── 按钮 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  height: 40px;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease-standard);
  user-select: none;
  white-space: nowrap;
  min-width: fit-content;
}

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

.btn-primary {
  background: var(--seal);
  color: #fff;
  box-shadow: 0 1px 3px rgba(199,91,58,0.25);
}
.btn-primary:hover {
  background: var(--seal-dark);
  box-shadow: 0 2px 6px rgba(199,91,58,0.35);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(199,91,58,0.2);
}

.btn-outline {
  background: transparent;
  color: var(--seal);
  border: 1.5px solid var(--seal);
}
.btn-outline:hover {
  background: var(--seal-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-light);
  border: 1px solid var(--hairline);
}
.btn-ghost:hover {
  border-color: var(--hairline-strong);
  color: var(--seal);
  background: var(--seal-glow);
}

.btn-sm { height: 32px; padding: 0 14px; font-size: 0.82rem; }
.btn-lg { height: 48px; padding: 0 28px; font-size: 1rem; }

/* ── 卡片 ── */
.card {
  background: var(--paper-white);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-normal) var(--ease-standard);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

/* ── 表单 ── */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-light);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
  font-weight: 400;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--hairline);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  background: var(--paper);
  color: var(--ink);
  transition: border-color var(--dur-fast) var(--ease-standard),
              box-shadow var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard);
}

.form-group input:hover,
.form-group textarea:hover {
  border-color: var(--hairline-strong);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--seal);
  background: var(--paper-white);
  box-shadow: 0 0 0 3px var(--seal-glow);
}

.form-group textarea {
  min-height: 200px;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--ink-ghost);
}

/* ── 排版 ── */
.page-title {
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: var(--space-sm);
  text-align: center;
  text-indent: 0.2em;
}

.page-subtitle {
  text-align: center;
  color: var(--ink-fade);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xl);
  font-weight: 300;
}

/* ── 容器 ── */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  position: relative;
  z-index: 1;
}

.container-wide {
  max-width: 880px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  position: relative;
  z-index: 1;
}

/* ── Toast ── */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  z-index: 200;
  animation: toastIn var(--dur-normal) var(--ease-enter);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
}

.toast-error { background: #fef0f0; color: var(--danger); border: 1px solid rgba(176,48,48,0.15); }
.toast-success { background: #f2f8ed; color: var(--success); border: 1px solid rgba(90,138,60,0.15); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-12px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── 空状态 ── */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  color: var(--ink-fade);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.4;
}

.empty-state p {
  color: var(--ink-light);
  margin-bottom: var(--space-lg);
}

/* ── 分页加载 ── */
.loading-spinner {
  display: flex;
  justify-content: center;
  padding: var(--space-xl);
}

.loading-spinner::after {
  content: '';
  width: 24px; height: 24px;
  border: 2px solid var(--hairline);
  border-top-color: var(--seal);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── 弹簧动画（信封拆开感） ── */
@keyframes revealIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal { animation: revealIn var(--dur-slow) var(--ease-enter) both; }
.reveal-d1 { animation-delay: 0.05s; }
.reveal-d2 { animation-delay: 0.1s; }
.reveal-d3 { animation-delay: 0.15s; }

/* ── 响应式 ── */
@media (max-width: 640px) {
  :root {
    --space-xl: 20px;
    --space-2xl: 32px;
    --space-3xl: 40px;
  }

  nav {
    padding: 0 var(--space-md);
    height: 52px;
  }

  nav .nav-links {
    gap: var(--space-sm);
  }

  nav .nav-links a {
    font-size: 0.8rem;
  }

  .container,
  .container-wide {
    padding: var(--space-lg) var(--space-md);
  }

  .page-title { font-size: 1.25rem; }

  .card { padding: var(--space-lg); }

  .btn { height: 44px; padding: 0 20px; }
  .btn-sm { height: 36px; }
}