/* ============================================================
   弈心 Yixin 学习 —— 全局设计系统
   学院风 × macOS 精致质感（所有页面共用，仅改变量即可换主题）
   ============================================================ */

:root {
  /* 色彩系统 —— 学院风 */
  --paper: #FAF7F0;          /* 页面底色（象牙白） */
  --paper-2: #F3EEE3;        /* 区块底 */
  --paper-3: #ECE5D4;        /* 更深区块底 */
  --ink-green: #1F4D3A;      /* 主色（墨绿） */
  --ink-green-deep: #173B2D; /* 主色 hover */
  --ink-green-soft: rgba(31, 77, 58, 0.10);
  --ink-blue: #1E3A5F;       /* 辅色（藏蓝） */
  --gold: #C8962E;           /* 点缀（琥珀金） */
  --gold-deep: #A87A1F;
  --gold-soft: rgba(200, 150, 46, 0.14);
  --ink: #23261F;            /* 正文墨黑 */
  --ink-2: #6B6F63;          /* 次要文字 */
  --ink-3: #9A9C8E;          /* 弱文字 */
  --border: #E4DECC;         /* 细边框（学院风签名元素） */
  --success: #3E7C4F;
  --warning: #C8962E;
  --danger: #B0483E;

  /* macOS 玻璃材质 */
  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-bg-strong: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-blur: blur(20px) saturate(180%);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.65);
  --shadow-card: 0 1px 2px rgba(31, 77, 58, 0.04), 0 8px 24px rgba(31, 77, 58, 0.08);
  --shadow-card-hover: 0 2px 4px rgba(31, 77, 58, 0.06), 0 14px 36px rgba(31, 77, 58, 0.13);
  --shadow-pop: 0 8px 20px rgba(31, 77, 58, 0.10), 0 24px 60px rgba(31, 77, 58, 0.16);

  /* 形态 */
  --radius: 14px;            /* 连续曲率圆角 */
  --radius-sm: 6px;
  --radius-pill: 999px;

  /* macOS 动效 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur: 220ms;
  --dur-slow: 320ms;

  /* 字体 */
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-sans: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-en-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'Roboto Mono', 'SF Mono', Consolas, monospace;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--ink-green); text-decoration: none; }
a:hover { color: var(--ink-green-deep); }

h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--ink);
  letter-spacing: 0.01em;
}

::selection { background: var(--gold-soft); }

/* ---------- 玻璃卡片（macOS 质感通用组件） ---------- */
.glass-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-highlight), var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.glass-card.interactive:hover {
  transform: translateY(-1px);
  box-shadow: var(--glass-highlight), var(--shadow-card-hover);
}
.glass-card.interactive:active { transform: scale(0.97); transition-duration: var(--dur-fast); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  color: #fff;
  background: var(--ink-green);
  box-shadow: var(--glass-highlight), 0 6px 16px rgba(31, 77, 58, 0.22);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease);
}
.btn:hover { background: var(--ink-green-deep); transform: translateY(-1px); filter: saturate(1.05); }
.btn:active { transform: scale(0.97); transition-duration: var(--dur-fast); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-gold { background: var(--gold); box-shadow: var(--glass-highlight), 0 6px 16px rgba(200, 150, 46, 0.32); }
.btn-gold:hover { background: var(--gold-deep); }

.btn-ghost {
  background: transparent;
  color: var(--ink-green);
  border: 1px solid var(--border);
  box-shadow: none;
}
.btn-ghost:hover { background: var(--ink-green-soft); transform: translateY(-1px); }

.btn-block { width: 100%; }

/* ---------- 表单 ---------- */
.field { display: grid; gap: 7px; margin-bottom: 18px; }
.field label { font-size: 13px; font-weight: 600; color: var(--ink-2); letter-spacing: 0.02em; }

.field input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.6);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink);
  outline: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.field input::placeholder { color: var(--ink-3); }
.field input:focus {
  border-color: var(--ink-green);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 0 0 4px rgba(31, 77, 58, 0.10);
}

.password-field { position: relative; }
.password-field input { padding-right: 48px; }
.password-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: none;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease);
}
.password-toggle:hover { background: var(--ink-green-soft); }
.password-toggle svg { width: 19px; height: 19px; }

/* ---------- 消息 ---------- */
.message { min-height: 24px; font-size: 13.5px; margin-top: 10px; }
.message.success { color: var(--success); }
.message.error { color: var(--danger); }

/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 28px;
  background: rgba(250, 247, 240, 0.72);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  backdrop-filter: blur(12px) saturate(160%);
  border-bottom: 1px solid rgba(228, 222, 204, 0.8);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  background: linear-gradient(150deg, var(--ink-green), var(--ink-green-deep));
  color: #F5E7C6;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 800;
  box-shadow: var(--glass-highlight), 0 4px 10px rgba(31, 77, 58, 0.28);
}
.brand-copy { display: flex; flex-direction: column; line-height: 1.25; }
.brand-copy strong { font-family: var(--font-serif); font-size: 16px; font-weight: 800; letter-spacing: 0.03em; }
.brand-copy span { font-size: 11px; color: var(--ink-2); }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--ink-2);
  font-weight: 600;
  font-size: 14px;
  transition: all var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--ink-green); background: var(--ink-green-soft); }
.nav-links a.active { color: #fff; background: var(--ink-green); }

/* ---------- 认证页（居中单卡毛玻璃 + 光斑） ---------- */
/* 卡片高于视口时允许纵向滚动（矮屏笔记本/平板横屏不再裁切内容） */
.auth-body { overflow-x: hidden; overflow-y: auto; }

.aurora-blobs { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.aurora-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}
.aurora-blob.green {
  width: 46vw; height: 46vw; max-width: 620px; max-height: 620px;
  left: -12vw; top: -14vw;
  background: radial-gradient(circle, rgba(31, 77, 58, 0.34), transparent 68%);
  animation: blob-drift-a 26s ease-in-out infinite alternate;
}
.aurora-blob.gold {
  width: 40vw; height: 40vw; max-width: 540px; max-height: 540px;
  right: -10vw; bottom: -12vw;
  background: radial-gradient(circle, rgba(200, 150, 46, 0.30), transparent 68%);
  animation: blob-drift-b 32s ease-in-out infinite alternate;
}
@keyframes blob-drift-a {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(6vw, 5vh, 0) scale(1.08); }
}
@keyframes blob-drift-b {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(-5vw, -6vh, 0) scale(1.1); }
}

.auth-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100dvh; /* 移动端动态视口：地址栏收起/展开时高度正确 */
  display: grid;
  place-items: center;
  padding: 40px 20px;
  box-sizing: border-box;
}

.auth-card {
  width: min(420px, 94vw);
  padding: 42px 38px 34px;
  animation: card-in var(--dur-slow) var(--ease-spring);
}
@keyframes card-in {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-brand { text-align: center; margin-bottom: 28px; }
.auth-brand .brand-mark {
  width: 52px; height: 52px; font-size: 27px; border-radius: 13px; margin: 0 auto 14px;
}
.auth-brand h1 { margin: 0 0 4px; font-size: 24px; font-weight: 800; }
.auth-brand p { margin: 0; font-size: 12.5px; color: var(--ink-2); letter-spacing: 0.04em; }

.auth-card h2 { margin: 0 0 4px; font-size: 18px; }
.auth-card .section-copy { margin: 0 0 22px; font-size: 13.5px; color: var(--ink-2); }

/* 注册页：标题与说明水平居中（与品牌区对齐） */
.register-page .auth-card h2,
.register-page .auth-card .section-copy { text-align: center; }

/* 标题 + 说明同行（用户登录 请输入手机号和密码。） */
.auth-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 22px;
}
.auth-head h2 { margin: 0; }
.auth-head .section-copy { margin: 0; }

.auth-note {
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--paper-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 20px;
  line-height: 1.65;
}
.auth-note strong { color: var(--ink-green); }

.auth-secondary {
  margin-top: 16px;
  text-align: center;
  font-size: 15px; /* 底部两行文字放大两个号（13 → 15px） */
  color: var(--ink-2);
  line-height: 1.7;
}
.auth-secondary a { font-weight: 600; }

/* 去注册账号：红色毛玻璃胶囊按钮 */
.auth-secondary a.auth-secondary-btn {
  display: inline-flex;
  align-items: center;
  margin: 2px 8px;
  padding: 8px 22px;
  border: 1px solid rgba(114, 47, 55, 0.38);
  border-radius: var(--radius-pill);
  background: rgba(114, 47, 55, 0.14);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  backdrop-filter: blur(12px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55), 0 6px 16px rgba(114, 47, 55, 0.16);
  color: #722F37;
  font-weight: 700;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.auth-secondary a.auth-secondary-btn:hover {
  transform: translateY(-1px);
  border-color: #722F37;
  background: rgba(114, 47, 55, 0.2);
  color: #5A242B;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55), 0 10px 22px rgba(114, 47, 55, 0.24);
}
.auth-secondary a.auth-secondary-btn:active { transform: scale(0.95); }

/* ---------- 通用布局 ---------- */
.layout { max-width: 1180px; margin: 0 auto; padding: 40px 24px 64px; }
.page-title { margin: 0 0 6px; font-size: 26px; }
.page-subtitle { margin: 0 0 28px; color: var(--ink-2); font-size: 14px; }

.grid-two { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.panel {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-highlight), var(--shadow-card);
  padding: 28px;
}
.panel h1, .panel h2 { margin-top: 0; }
.section-title { margin: 0 0 4px; font-size: 18px; }
.section-copy { margin: 0 0 20px; font-size: 13.5px; color: var(--ink-2); }

.actions-row { display: flex; align-items: center; gap: 14px; margin-top: 8px; flex-wrap: wrap; }
.inline-link { font-size: 13.5px; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .layout { padding: 24px 16px 48px; }
  .grid-two { grid-template-columns: 1fr; }
  .topbar { padding: 8px 14px; }
  .nav-links { gap: 2px; }
  .nav-links a { padding: 7px 12px; font-size: 13px; }
  .aurora-blob.green { width: 70vw; height: 70vw; opacity: 0.34; }
  .aurora-blob.gold { width: 60vw; height: 60vw; opacity: 0.34; }
}

/* 平板/窄屏顶栏：6 个导航项 + 退出按钮放不下时，导航可横向滑动 */
/* 矮屏桌面/平板（高度 ≤920px）：认证卡片纵向紧凑，一屏放下不滚动 */
@media (min-width: 641px) and (max-height: 920px) {
  .auth-shell { padding: 16px 20px; }
  .auth-brand { margin-bottom: 12px; }
  .auth-brand .brand-mark { width: 40px; height: 40px; font-size: 21px; border-radius: 10px; margin: 0 auto 8px; }
  .auth-brand h1 { font-size: 19px; }
  .auth-card { padding: 24px 34px 22px; }
  .auth-card h2 { font-size: 16px; }
  .auth-card .section-copy { font-size: 12px; margin-bottom: 12px; }
  .auth-note { font-size: 12px; padding: 8px 12px; margin-bottom: 14px; line-height: 1.5; }
  .field { margin-bottom: 12px; gap: 4px; }
  .field label { font-size: 12px; }
  .field input { padding: 9px 14px; font-size: 14px; }
  .btn { padding: 10px 26px; font-size: 14px; }
  .message { min-height: 18px; margin-top: 6px; font-size: 12px; }
  .auth-secondary { margin-top: 10px; font-size: 13px; }
  .auth-head { margin-bottom: 14px; }
}

@media (max-width: 820px) {
  .topbar { gap: 8px; padding: 8px 14px; }
  .nav-links {
    gap: 2px;
    overflow-x: auto;
    flex: 1 1 auto;
    min-width: 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    justify-content: flex-start;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { padding: 7px 12px; font-size: 13px; white-space: nowrap; flex: none; }
  .topbar .btn.nav-logout, .topbar [data-logout] { padding: 7px 14px !important; font-size: 13px !important; white-space: nowrap; flex: none; }
}

@media (max-width: 640px) {
  .auth-card { padding: 32px 24px 28px; }
  /* 登录卡片精确居中于屏幕中间；内容超高时页面可滚动 */
  .auth-body { overflow-x: hidden; overflow-y: auto; }
  .auth-shell {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
  }

  /* 注册/找回密码页：一屏紧凑布局（免上下滑动填写），内容超高时仍可滚动兜底 */
  .register-page .auth-shell, .forgot-page .auth-shell { padding: 12px; }
  .register-page .auth-card, .forgot-page .auth-card { padding: 18px 18px 14px; }
  .register-page .auth-brand, .forgot-page .auth-brand { margin-bottom: 8px; }
  .register-page .auth-brand .brand-mark, .forgot-page .auth-brand .brand-mark { width: 38px; height: 38px; font-size: 20px; border-radius: 10px; margin: 0 auto 7px; }
  .register-page .auth-brand h1, .forgot-page .auth-brand h1 { font-size: 17px; margin-bottom: 2px; }
  .register-page .auth-brand p, .forgot-page .auth-brand p { display: none; }
  .register-page .auth-card h2, .forgot-page .auth-card h2 { font-size: 16px; margin-bottom: 2px; }
  .register-page .auth-card .section-copy, .forgot-page .auth-card .section-copy { font-size: 12px; margin-bottom: 10px; }
  .register-page .auth-note, .forgot-page .auth-note { font-size: 11px; padding: 7px 10px; margin-bottom: 10px; line-height: 1.5; }
  .register-page .auth-note .note-detail { display: none; }
  .register-page .field, .forgot-page .field { margin-bottom: 8px; gap: 3px; }
  .register-page .field label, .forgot-page .field label { font-size: 12px; }
  .register-page .field input, .forgot-page .field input { padding: 8px 12px; font-size: 14px; border-radius: 8px; }
  .register-page .btn, .forgot-page .btn { padding: 10px 26px; font-size: 14px; }
  .register-page .message, .forgot-page .message { min-height: 16px; margin-top: 5px; font-size: 12px; }
  .register-page .auth-secondary, .forgot-page .auth-secondary { margin-top: 8px; font-size: 13px; }

  /* 个人中心：移动端一屏紧凑布局（不溢出屏幕） */
  .layout { padding: 12px 12px 16px; }
  .grid-two { gap: 8px; }
  .panel { padding: 12px 12px 14px; }
  .page-title { font-size: 18px; margin-bottom: 2px; }
  .page-subtitle { display: none; }
  .info-item { padding: 7px 10px; font-size: 12.5px; }
  .info-item strong { font-size: 12px; }
  /* 面板内退出按钮与顶栏重复，移动端隐藏省空间 */
  .actions-row:has([data-logout]) { display: none; }
  .actions-row { margin-top: 4px; gap: 10px; }
  .section-title { font-size: 14.5px; }
  .section-copy { display: none; }
  .field { margin-bottom: 6px; gap: 2px; }
  .field label { font-size: 11.5px; }
  .field input { padding: 6px 12px; font-size: 13.5px; border-radius: 8px; }
  .actions-row .btn { padding: 8px 20px; font-size: 13px; }
  .message { min-height: 14px; margin-top: 3px; font-size: 12px; }

  /* 顶栏：隐藏品牌副标题，导航可横向滑动，避免 375px 溢出 */
  .topbar { gap: 8px; padding: 8px 12px; }
  .brand { gap: 8px; }
  .brand-mark { width: 32px; height: 32px; border-radius: 8px; font-size: 17px; }
  .brand-copy span { display: none; }
  .brand-copy strong { font-size: 14.5px; }
  .nav-links {
    gap: 2px;
    overflow-x: auto;
    flex: 1 1 auto;
    min-width: 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    justify-content: flex-start;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { padding: 7px 11px; font-size: 12.5px; white-space: nowrap; flex: none; }
  .topbar .btn.nav-logout, .topbar [data-logout] { padding: 7px 12px !important; font-size: 12.5px !important; white-space: nowrap; }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}