/* ============ 诗境 · 设计令牌 ============ */
:root {
  /* 纸与墨 */
  --paper: #f7f4ec;
  --paper-2: #f1ecdf;
  --paper-3: #e8e1cf;
  --ink: #2b2b2b;
  --ink-2: #55504a;
  --ink-3: #8a8478;
  --ink-4: #b3ac9d;
  /* 朱砂 / 竹青 / 石青 */
  --cinnabar: #c3272b;
  --cinnabar-deep: #9c1c20;
  --cinnabar-soft: rgba(195, 39, 43, 0.08);
  --bamboo: #5c7360;
  --bamboo-soft: rgba(92, 115, 96, 0.1);
  --stone: #46606e;
  --line: rgba(43, 43, 43, 0.12);
  --line-strong: rgba(43, 43, 43, 0.24);

  /* 字体 */
  --font-display: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
  --font-poem: "STKaiti", "Kaiti SC", "KaiTi", "Songti SC", "SimSun", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui,
    -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Courier New", monospace;

  /* 尺度 */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(43, 43, 43, 0.06);
  --shadow-md: 0 10px 30px -18px rgba(43, 43, 43, 0.35);
  --shadow-lg: 0 26px 60px -32px rgba(43, 43, 43, 0.45);
  --max: 1120px;
  --dur: 0.28s;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* 宣纸纹理：极细的斜向纤维 + 微弱光晕 */
  background-image:
    radial-gradient(120% 90% at 12% 0%, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0) 55%),
    radial-gradient(90% 70% at 100% 8%, rgba(195, 39, 43, 0.05) 0%, rgba(195, 39, 43, 0) 60%),
    repeating-linear-gradient(105deg, rgba(43, 43, 43, 0.018) 0 1px, transparent 1px 7px),
    repeating-linear-gradient(15deg, rgba(43, 43, 43, 0.012) 0 1px, transparent 1px 11px);
  background-attachment: fixed;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.3;
}

p {
  margin: 0;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}

::selection {
  background: var(--cinnabar);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

/* ============ 通用构件 ============ */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 印章 */
.seal {
  --seal-size: 42px;
  width: var(--seal-size);
  height: var(--seal-size);
  display: grid;
  place-items: center;
  background: var(--cinnabar);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: calc(var(--seal-size) * 0.5);
  font-weight: 700;
  line-height: 1;
  border-radius: 6px;
  box-shadow: inset 0 0 0 2px rgba(247, 244, 236, 0.35), 0 4px 12px -6px rgba(195, 39, 43, 0.8);
  letter-spacing: 0;
  flex: none;
  user-select: none;
}

/* 小标签 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--line-strong);
}

/* 按钮 */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border-radius: var(--r-sm);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 14px;
  letter-spacing: 0.12em;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), opacity var(--dur) var(--ease);
  will-change: transform;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary {
  --btn-bg: var(--cinnabar);
  --btn-fg: #fffaf4;
}

.btn-primary:hover {
  --btn-bg: var(--cinnabar-deep);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border: 1px solid var(--line-strong);
}

.btn-ghost:hover {
  --btn-bg: rgba(43, 43, 43, 0.04);
  box-shadow: none;
}

.btn-sm {
  min-height: 36px;
  padding: 0 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.btn-block {
  width: 100%;
}

/* 加载中的小印 */
.spinner {
  width: 14px;
  height: 14px;
  border: 1.5px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* 表单 */
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.field label {
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--ink-2);
}

.input,
.textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 12px 14px;
  font-size: 15px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--ink-4);
}

.input:focus,
.textarea:focus {
  outline: none;
  border-color: var(--cinnabar);
  background: #fffdf8;
  box-shadow: 0 0 0 3px var(--cinnabar-soft);
}

.textarea {
  resize: vertical;
  min-height: 118px;
  line-height: 1.9;
  font-family: var(--font-poem);
  font-size: 17px;
}

.hint {
  font-size: 12px;
  color: var(--ink-3);
}

.error-text {
  font-size: 13px;
  color: var(--cinnabar);
  min-height: 20px;
}

/* 提示条 */
.toast-stack {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 90;
  pointer-events: none;
  width: min(92vw, 420px);
}

.toast {
  background: var(--ink);
  color: var(--paper);
  padding: 11px 18px;
  border-radius: var(--r-sm);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.32s var(--ease);
}

.toast.error {
  background: var(--cinnabar-deep);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(247, 244, 236, 0.82);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 62px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.22em;
}

.brand .seal {
  --seal-size: 32px;
  font-size: 16px;
}

.topnav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.topnav a,
.topnav button {
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13.5px;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  border-radius: var(--r-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.topnav a:hover,
.topnav button:hover {
  color: var(--cinnabar);
  background: rgba(195, 39, 43, 0.05);
}

.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--paper-3);
  color: transparent;
  border-radius: var(--r-sm);
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.65), transparent);
  animation: shimmer 1.4s infinite;
}

@keyframes shimmer {
  to {
    transform: translateX(100%);
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 640px) {
  .wrap {
    padding: 0 18px;
  }
  .topbar-inner {
    height: 56px;
  }
  .brand {
    font-size: 17px;
  }
}