/* ==========================================================================
   寄给未来 (Future Letter) — 2012-2016 独立工匠书信风格 (Human-Crafted Stationery UI)
   完全兼容原有 HTML/JS 结构，无需改动 DOM
   ========================================================================== */

:root {
  --bg-desk: #e8e3d9;           /* 亚麻桌面底色 */
  --bg-paper: #fdfbf7;          /* 棉质信纸米白 */
  --bg-well: #f3efe6;           /* 凹陷控件槽底色 */
  --ink-primary: #2b2623;       /* 钢笔浓墨色 */
  --ink-secondary: #635a52;     /* 次要文字 */
  --ink-muted: #968c82;         /* 弱化文字/旁注 */
  --border-paper: #d5ccb9;      /* 信纸外框 */
  --border-input: #bfb5a2;      /* 输入框外框 */
  --stamp-red: #b3392b;         /* 火漆/邮戳红 */
  --stamp-red-dark: #87261b;
  --airmail-blue: #2c587c;      /* 航空信封蓝 */
  --seal-green: #2e6b40;        /* 封存邮戳绿 */
  
  /* 全站仿宋：Windows 为 FangSong，macOS 为 STFangsong；没有仿宋的设备回退到宋体 */
  --font-fangsong: "FangSong", "STFangsong", "FangSong_GB2312", "仿宋", "仿宋_GB2312", "Songti SC", "STSong", "SimSun", serif;
  --font-serif: var(--font-fangsong);
  --font-sans: var(--font-fangsong);
  --font-mono: var(--font-fangsong);
}

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

[hidden] {
  display: none !important;
}

body {
  background-color: var(--bg-desk);
  /* 2010年代经典的微噪点纸张桌面纹理 */
  background-image: 
    radial-gradient(rgba(43, 38, 35, 0.045) 1px, transparent 0),
    linear-gradient(to bottom, #e2dcd0 0%, #eae5dc 260px);
  background-size: 16px 16px, 100% 100%;
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  padding: 28px 16px 64px;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   顶部导航与信头区 (告别 AI 大 Hero，改为经典独立站左对齐书信眉头)
   ========================================================================== */

.hero {
  max-width: 660px;
  margin: 0 auto 22px;
}

.hero-text {
  padding: 0 2px;
}

.hero-text h1 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: normal;
  color: var(--ink-primary);
  letter-spacing: -0.5px;
  margin-bottom: 4px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
}

.hero-text p {
  color: var(--ink-secondary);
  font-size: 14px;
}

/* ==========================================================================
   核心信纸卡片 (.card) — 航空信封斜纹边 + 叠纸立体阴影
   ========================================================================== */

.container {
  max-width: 660px;
  margin: 0 auto;
}

.card {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-paper);
  border-radius: 3px;
  padding: 36px 40px 38px;
  position: relative;
  /* 2012年经典的3层真实叠纸阴影，彻底告别AI毛玻璃与大圆角 */
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.08),
    0 4px 0 -2px #f6f3ec,
    0 4px 1px -1px rgba(0, 0, 0, 0.07),
    0 8px 0 -4px #efeae0,
    0 8px 1px -3px rgba(0, 0, 0, 0.07),
    0 14px 24px rgba(43, 38, 35, 0.08);
}

/* 顶部红蓝相间的航空信封斜纹边 */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
  background: repeating-linear-gradient(
    -45deg,
    var(--stamp-red) 0,
    var(--stamp-red) 14px,
    transparent 14px,
    transparent 20px,
    var(--airmail-blue) 20px,
    var(--airmail-blue) 34px,
    transparent 34px,
    transparent 40px
  );
  border-bottom: 1px solid #e5dec9;
  opacity: 0.85;
}

@media (max-width: 560px) {
  .card {
    padding: 28px 20px 28px;
  }
}

.card.center {
  text-align: center;
  padding: 48px 36px;
}

/* ==========================================================================
   表单与书写体验 (.field, textarea, input)
   ========================================================================== */

.field {
  margin-bottom: 26px;
  position: relative;
}

.field label,
.field .label {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: bold;
  color: var(--ink-primary);
  margin-bottom: 10px;
}

/* 横线信纸书写区 */
textarea#body {
  width: 100%;
  min-height: 248px;
  padding: 6px 14px;
  background-color: #fffdf9;
  border: 1px solid var(--border-input);
  border-top-color: #a89f8d;
  border-radius: 3px;
  color: var(--ink-primary);
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 30px;
  /* 严格对齐 30px 行高的钢笔信纸横线 */
  background-image: linear-gradient(transparent, transparent 29px, #e8e1d3 30px);
  background-size: 100% 30px;
  background-position: 0 6px;
  background-attachment: local;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.06);
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea#body::placeholder {
  color: var(--ink-muted);
  font-style: italic;
}

input[type="email"],
input[type="date"],
input[type="text"] {
  width: 100%;
  height: 40px;
  padding: 8px 12px;
  background-color: #ffffff;
  border: 1px solid var(--border-input);
  border-top-color: #a89f8d;
  border-radius: 3px;
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.06);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea#body:focus,
input[type="email"]:focus,
input[type="date"]:focus,
input.code:focus {
  outline: none;
  border-color: var(--airmail-blue);
  box-shadow: 
    inset 0 1px 2px rgba(0, 0, 0, 0.06),
    0 0 0 3px rgba(44, 88, 124, 0.14);
}

/* 字数统计：右上角复古等宽计数器 */
.counter {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
  margin-top: 5px;
}

.hint {
  margin-top: 6px;
  font-size: 12px;
  color: var(--ink-muted);
}

/* ==========================================================================
   送达时间选择器 (.options) — 2012 经典机械分段按钮组
   ========================================================================== */

.options {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--border-input);
  border-radius: 3px;
  overflow: hidden;
  background-color: var(--bg-well);
  box-shadow: 0 1px 0 #ffffff;
}

@media (max-width: 560px) {
  .options {
    grid-template-columns: repeat(3, 1fr);
  }
}

.options button {
  appearance: none;
  background: linear-gradient(to bottom, #ffffff 0%, #f2ede3 100%);
  border: none;
  border-right: 1px solid var(--border-input);
  padding: 9px 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-secondary);
  cursor: pointer;
  text-shadow: 0 1px 0 #ffffff;
  box-shadow: inset 0 1px 0 #ffffff;
  transition: background 0.1s ease, color 0.1s ease;
}

.options button:last-child {
  border-right: none;
}

@media (max-width: 560px) {
  .options button:nth-child(3) {
    border-right: none;
  }
  .options button:nth-child(-n+3) {
    border-bottom: 1px solid var(--border-input);
  }
}

.options button:hover {
  background: #fdfbf7;
  color: var(--ink-primary);
}

/* 选中状态：真实的物理按下凹陷感 */
.options button[aria-checked="true"],
.options button.active {
  background: #ded7c8;
  background-image: linear-gradient(to bottom, #d5cdbd 0%, #e4decfe6 100%);
  color: var(--ink-primary);
  font-weight: bold;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* 送达日期摘要：打字机邮戳风格 */
.when-summary {
  margin-top: 10px;
  margin-bottom: 6px;
  padding: 7px 12px;
  background-color: var(--bg-well);
  border-left: 3px solid var(--airmail-blue);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-primary);
}

.custom-date {
  margin-top: 10px;
  max-width: 220px;
}

/* 复古虚线文字链接按钮 */
.link {
  background: none;
  border: none;
  border-bottom: 1px dashed var(--ink-secondary);
  padding: 0 0 1px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-secondary);
  text-decoration: none;
  cursor: pointer;
  display: inline-block;
}

.link:hover {
  color: var(--stamp-red);
  border-bottom: 1px solid var(--stamp-red);
}

/* Turnstile 容器留白 */
.turnstile {
  margin: 18px 0;
}

/* ==========================================================================
   按钮体系 (.btn) — 2010-2015 经典高光微渐变拟物按钮
   ========================================================================== */

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 3px;
  cursor: pointer;
  /* 火漆印章红微立体渐变 */
  background-color: var(--stamp-red);
  background-image: linear-gradient(to bottom, #c44334 0%, #9e2f22 100%);
  border: 1px solid var(--stamp-red-dark);
  color: #ffffff;
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.35);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.28),
    0 1px 2px rgba(0, 0, 0, 0.15);
  transition: filter 0.12s ease;
}

.btn:hover {
  filter: brightness(1.06);
}

.btn:active {
  background-image: linear-gradient(to bottom, #962c20 0%, #b3392b 100%);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-block {
  display: block;
  width: 100%;
}

.btn-outline {
  background-color: #f4f0e6;
  background-image: linear-gradient(to bottom, #ffffff 0%, #eae4d7 100%);
  border: 1px solid #b5ab99;
  color: var(--ink-primary);
  text-shadow: 0 1px 0 #ffffff;
  box-shadow:
    inset 0 1px 0 #ffffff,
    0 1px 2px rgba(0, 0, 0, 0.06);
}

.btn-outline:hover {
  border-color: #968c7b;
  filter: none;
  background-image: linear-gradient(to bottom, #ffffff 0%, #e2dbcc 100%);
}

.btn-danger {
  background-color: #9e2f22;
  background-image: linear-gradient(to bottom, #b83728 0%, #822217 100%);
  border-color: #661910;
}

/* ==========================================================================
   第二步 & 第三步：把 AI 徽章图标改造为复古双圈邮戳 (.badge)
   ========================================================================== */

.badge {
  width: 68px;
  height: 68px;
  margin: 0 auto 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  /* 邮戳故意微微倾斜一点，增加人味 */
  transform: rotate(-6deg);
}

.badge::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  border: 1px dashed currentColor;
}

.badge svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.badge-blue {
  color: var(--airmail-blue);
  border: 2px solid var(--airmail-blue);
  background-color: rgba(44, 88, 124, 0.04);
}

.badge-green {
  color: var(--seal-green);
  border: 2px solid var(--seal-green);
  background-color: rgba(46, 107, 64, 0.05);
}

.card h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: bold;
  color: var(--ink-primary);
  margin-bottom: 10px;
}

.muted {
  color: var(--ink-secondary);
  font-size: 14px;
  margin-bottom: 16px;
}

.muted strong {
  color: var(--ink-primary);
  font-family: var(--font-mono);
  background: var(--bg-well);
  padding: 1px 6px;
  border-radius: 2px;
  border: 1px solid #e0d8c8;
}

/* 6位验证码输入框：复古电报/邮政编码格风格 */
input.code {
  display: block;
  width: 240px;
  margin: 20px auto 22px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: bold;
  letter-spacing: 10px;
  text-align: center;
  background-color: #fffdf9;
  border: 1px solid var(--border-input);
  border-top-color: #a89f8d;
  border-radius: 3px;
  color: var(--ink-primary);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.07);
}

.row-links {
  margin-top: 18px;
  display: flex;
  justify-content: center;
  gap: 24px;
}

.manage-actions {
  margin: 24px 0 20px;
}

/* 错误提示信息 */
.error {
  color: var(--stamp-red);
  font-size: 13px;
  margin-top: 10px;
  min-height: 20px;
}

.error:not(:empty) {
  padding: 8px 12px;
  background-color: #fbf0ee;
  border: 1px solid #e3b9b3;
  border-radius: 3px;
}

/* ==========================================================================
   底部特性区 (.features) — 去掉 AI 营销卡片感，改为信封背面凸版印刷说明栏
   ========================================================================== */

.features {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid #d4cbb8;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.feature {
  padding: 4px 8px;
  text-align: left;
}

.feature svg {
  width: 16px;
  height: 16px;
  fill: var(--ink-secondary);
  vertical-align: -2px;
  margin-right: 6px;
}

.feature h3 {
  display: inline;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: bold;
  color: var(--ink-primary);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
}

.feature p {
  margin-top: 4px;
  font-size: 12px;
  color: var(--ink-secondary);
  line-height: 1.5;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   页脚 (.footer) — 经典独立站凸版雕刻阴影文字 (Letterpress)
   ========================================================================== */

.footer {
  max-width: 660px;
  margin: 36px auto 0;
  padding-top: 18px;
  border-top: 1px dotted #c7beac;
  text-align: center;
  font-size: 12px;
  color: var(--ink-muted);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.75);
}

.footer p + p {
  margin-top: 4px;
  font-family: var(--font-serif);
}

/* ==========================================================================
   兼容补丁：验证码页按钮与输入框同宽；分段按钮的键盘焦点不被裁掉
   ========================================================================== */

#verify-form .btn-block {
  max-width: 240px;
  margin: 0 auto;
}

.options button:focus-visible {
  outline: 2px solid var(--airmail-blue);
  outline-offset: -3px;
}