/* ═══════════════════════════════════════════════════
   心境 · INNERSCAPE — 主题变量
   ═══════════════════════════════════════════════════ */

/* ── 浅色主题（默认） ── */
:root {
  /* 基础色板 */
  --ink: #f7f5f0;
  --ink-mid: #edebe4;
  --paper: #f5f0e8;
  --paper-warm: #ede8dc;
  --gold: #b08a28;
  --gold-light: #c9a84c;
  --rose: #c4687a;
  --teal-soft: #5b9ea0;
  --moss: #6b8a5e;
  --text-main: #3a3040;
  --text-muted: #9a9098;
  --card-bg: #ffffff;
  --border-soft: rgba(160, 140, 100, 0.3);

  /* 背景纹理 */
  --bg-radial-1: rgba(200, 180, 140, 0.15);
  --bg-radial-2: rgba(160, 170, 190, 0.1);
  --bg-gradient-from: #f5f2ec;
  --bg-gradient-mid: #f0ece5;
  --bg-gradient-to: #f8f6f2;

  /* 标题区 */
  --header-secondary: rgba(80, 60, 30, 0.4);
  --header-border-color: rgba(180, 150, 100, 0.3);
  --back-btn-color: rgba(80, 60, 30, 0.45);
  --title-glow: none;

  /* 筛选按钮 */
  --filter-btn-border: rgba(160, 140, 110, 0.3);
  --filter-btn-text: rgba(80, 60, 30, 0.5);

  /* 卡片 */
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.1);
  --card-text: #4a3a50;
  --card-border: rgba(180, 150, 100, 0.25);

  /* 留言框 */
  --compose-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --compose-border: rgba(180, 150, 100, 0.35);

  /* 输入区 */
  --textarea-bg: rgba(0, 0, 0, 0.03);
  --textarea-focus-bg: rgba(0, 0, 0, 0.05);

  /* 空状态 & Toast */
  --empty-text: rgba(80, 60, 30, 0.3);
  --toast-bg: rgba(50, 40, 30, 0.9);
  --toast-text: #e8c96a;
  --toast-border: rgba(200, 160, 80, 0.4);

  /* 星空（浅色模式下不可见） */
  --star-color: transparent;

  /* 主题切换按钮 */
  --toggle-hover-bg: rgba(0, 0, 0, 0.05);
}

/* ── 深色主题 ── */
[data-theme="dark"] {
  --ink: #1a1a2e;
  --ink-mid: #2d2d44;
  --paper: #f5f0e8;
  --paper-warm: #ede8dc;
  --gold: #c9a84c;
  --gold-light: #e8c96a;
  --rose: #c4687a;
  --teal-soft: #5b9ea0;
  --moss: #6b8a5e;
  --text-main: #2a2035;
  --text-muted: #7a7080;
  --card-bg: rgba(255, 252, 245, 0.92);
  --border-soft: rgba(180, 160, 120, 0.3);

  --bg-radial-1: rgba(90, 60, 120, 0.18);
  --bg-radial-2: rgba(60, 80, 100, 0.15);
  --bg-gradient-from: #0f0c1a;
  --bg-gradient-mid: #1a1430;
  --bg-gradient-to: #141828;

  --header-secondary: rgba(255, 255, 255, 0.35);
  --header-border-color: rgba(201, 168, 76, 0.25);
  --back-btn-color: rgba(255, 255, 255, 0.5);
  --title-glow: 0 0 40px rgba(201, 168, 76, 0.3);

  --filter-btn-border: rgba(255, 255, 255, 0.15);
  --filter-btn-text: rgba(255, 255, 255, 0.4);

  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.35);
  --card-text: #3a3040;
  --card-border: rgba(201, 168, 76, 0.2);

  --compose-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --compose-border: rgba(201, 168, 76, 0.3);

  --textarea-bg: rgba(0, 0, 0, 0.04);
  --textarea-focus-bg: rgba(0, 0, 0, 0.06);

  --empty-text: rgba(255, 255, 255, 0.25);
  --toast-bg: rgba(30, 25, 45, 0.95);
  --toast-text: var(--gold);
  --toast-border: rgba(201, 168, 76, 0.4);

  --star-color: rgba(255, 255, 255, 0.6);

  --toggle-hover-bg: rgba(255, 255, 255, 0.08);
}

/* ═══════════════════════════════════════════════════
   全局基础
   ═══════════════════════════════════════════════════ */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--ink);
  min-height: 100vh;
  color: var(--text-main);
  overflow-x: hidden;
  transition: background 0.4s ease;
}

/* ── 背景纹理 ── */
.bg-texture {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 30%, var(--bg-radial-1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 70%, var(--bg-radial-2) 0%, transparent 55%),
    linear-gradient(160deg, var(--bg-gradient-from) 0%, var(--bg-gradient-mid) 40%, var(--bg-gradient-to) 100%);
  z-index: 0;
  transition: background 0.4s ease;
}

/* ── 星空 ── */
.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: var(--star-color);
  animation: twinkle var(--d, 3s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  transition: background 0.4s ease;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50%       { opacity: 0.9; transform: scale(1.3); }
}

/* ═══════════════════════════════════════════════════
   头部
   ═══════════════════════════════════════════════════ */

.site-header {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 3rem 1.5rem 2rem;
  border-bottom: 0.5px solid var(--header-border-color);
  transition: border-color 0.4s ease;
}

.back-button {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  color: var(--back-btn-color);
  text-decoration: none;
  font-size: 13px;
  font-family: 'Noto Sans SC', sans-serif;
  letter-spacing: 0.1em;
  transition: color 0.2s;
}

.back-button:hover {
  color: var(--gold);
}

/* ── 主题切换按钮 ── */
.theme-toggle {
  position: absolute;
  top: 1.3rem;
  right: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--back-btn-color);
}

.theme-toggle:hover {
  background: var(--toggle-hover-bg);
}

.theme-toggle svg {
  transition: opacity 0.3s, transform 0.4s ease;
}

/* 浅色主题 → 显示月亮 */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

/* 深色主题 → 显示太阳 */
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.site-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--gold);
  text-shadow: var(--title-glow);
  margin-bottom: 0.4rem;
}

.site-subtitle {
  font-size: 0.85rem;
  color: var(--header-secondary);
  letter-spacing: 0.3em;
  font-weight: 300;
  transition: color 0.4s ease;
}

.site-decor {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 1rem;
  color: rgba(201, 168, 76, 0.4);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.site-decor::before,
.site-decor::after {
  content: '';
  display: block;
  width: 60px;
  height: 0.5px;
  background: linear-gradient(90deg, transparent, rgba(201, 168, 76, 0.5), transparent);
}

/* ═══════════════════════════════════════════════════
   布局
   ═══════════════════════════════════════════════════ */

.container {
  position: relative;
  z-index: 10;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* ═══════════════════════════════════════════════════
   发言区
   ═══════════════════════════════════════════════════ */

.compose-box {
  background: var(--card-bg);
  border-radius: 16px;
  border: 0.5px solid var(--compose-border);
  padding: 1.5rem;
  margin: 0 auto 2.5rem;
  max-width: 720px;
  box-shadow: var(--compose-shadow);
  transition: background 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
}

.compose-header {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.compose-header::after {
  content: '';
  flex: 1;
  height: 0.5px;
  background: var(--border-soft);
}

.mood-row {
  display: flex;
  gap: 8px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.mood-btn {
  padding: 5px 14px;
  border-radius: 20px;
  border: 0.5px solid var(--border-soft);
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  font-family: 'Noto Sans SC', sans-serif;
  color: var(--text-muted);
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

.mood-btn:hover  { border-color: var(--gold); color: var(--gold); }
.mood-btn.active { background: var(--gold); color: white; border-color: var(--gold); }

.name-input {
  width: 100%;
  border: none;
  border-bottom: 0.5px solid var(--border-soft);
  background: transparent;
  padding: 6px 0;
  font-size: 13px;
  font-family: 'Noto Sans SC', sans-serif;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  outline: none;
  letter-spacing: 0.05em;
}

.name-input::placeholder { color: var(--text-muted); }
.name-input:focus         { border-color: var(--gold); }

.msg-textarea {
  width: 100%;
  min-height: 100px;
  border: none;
  background: var(--textarea-bg);
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  font-family: 'Noto Serif SC', serif;
  font-weight: 300;
  color: var(--text-main);
  line-height: 1.8;
  resize: none;
  outline: none;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  transition: background 0.2s;
}

.msg-textarea::placeholder { color: var(--text-muted); font-style: italic; }
.msg-textarea:focus         { background: var(--textarea-focus-bg); }

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

.char-count {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.submit-btn {
  background: linear-gradient(135deg, var(--gold) 0%, #9a7628 100%);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 24px;
  font-size: 13px;
  font-family: 'Noto Sans SC', sans-serif;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: all 0.2s;
}

.submit-btn:hover  { opacity: 0.9; transform: translateY(-1px); }
.submit-btn:active { transform: translateY(0); }

/* ═══════════════════════════════════════════════════
   留言墙
   ═══════════════════════════════════════════════════ */

.feed-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.feed-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--header-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.4s ease;
}

.feed-count {
  background: rgba(201, 168, 76, 0.2);
  color: var(--gold);
  border-radius: 10px;
  padding: 2px 10px;
  font-size: 11px;
  letter-spacing: 0.05em;
}

.filter-row {
  display: flex;
  gap: 6px;
}

.filter-btn {
  background: transparent;
  border: 0.5px solid var(--filter-btn-border);
  color: var(--filter-btn-text);
  border-radius: 12px;
  padding: 3px 12px;
  font-size: 11px;
  font-family: 'Noto Sans SC', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

.filter-btn.active,
.filter-btn:hover {
  border-color: rgba(201, 168, 76, 0.5);
  color: var(--gold);
}

/* ═══════════════════════════════════════════════════
   卡片
   ═══════════════════════════════════════════════════ */

.cards-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  border-radius: 14px;
  border: 0.5px solid var(--card-border);
  padding: 1.2rem 1.4rem;
  animation: fadeUp 0.4s ease both;
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s, background 0.4s ease, border-color 0.4s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-shadow-hover);
}

.card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent, var(--gold));
  border-radius: 0 2px 2px 0;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.card-author {
  display: flex;
  align-items: center;
  gap: 8px;
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 500;
  flex-shrink: 0;
}

.card-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  letter-spacing: 0.05em;
}

.card-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mood-tag {
  font-size: 10px;
  padding: 2px 10px;
  border-radius: 10px;
  letter-spacing: 0.08em;
  font-family: 'Noto Sans SC', sans-serif;
}

.card-time {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.card-text {
  font-family: 'HarmonyOS Sans SC', 'Noto Serif SC', serif;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.85;
  color: var(--card-text);
  letter-spacing: 0.04em;
  flex: 1;
  transition: color 0.4s ease;
}

/* ═══════════════════════════════════════════════════
   空状态
   ═══════════════════════════════════════════════════ */

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--empty-text);
  font-size: 13px;
  letter-spacing: 0.1em;
  line-height: 2;
  transition: color 0.4s ease;
}

/* ═══════════════════════════════════════════════════
   Toast
   ═══════════════════════════════════════════════════ */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--toast-bg);
  color: var(--toast-text);
  border: 0.5px solid var(--toast-border);
  border-radius: 10px;
  padding: 10px 24px;
  font-size: 13px;
  letter-spacing: 0.15em;
  z-index: 100;
  transition: transform 0.3s ease, background 0.4s ease, color 0.4s ease;
  font-family: 'Noto Sans SC', sans-serif;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}