/* ========== 全局 ========== */
:root {
  --primary: #4A90E2;
  --primary-dark: #357ABD;
  --primary-light: #E8F0FE;
  --border: #CBD6E2;
  --bg: #F5F8FC;
  --text: #1F3B64;
  --muted: #5A7A9E;
  --danger: #E25555;
  --success: #4CAF50;
  --card: #FFFFFF;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,.06);
  /* 性别配色 - 柔和舒适 */
  --male-light: #D6E8FF;
  --male-mid: #A6C8F0;
  --female-light: #FFE0EC;
  --female-mid: #F5B7D0;
  --seat-empty: #F0F4FA;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;line-height:1.6;}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}

/* ========== 头部 ========== */
.top{display:flex;justify-content:space-between;align-items:center;
  padding:12px 18px;background:linear-gradient(135deg,#4A90E2,#7FB3F0);color:#fff;
  box-shadow:0 2px 12px rgba(74,144,226,.18);flex-wrap:wrap;gap:8px}
.top .logo{font-size:20px;font-weight:700;letter-spacing:1px}
.top .logo a{color:#fff}
.top nav{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.top nav a{color:#fff;margin-left:10px;font-size:14px;opacity:.88}
.top nav a:hover{opacity:1}
.top nav span{font-size:14px;opacity:.95;margin-right:6px}

/* ========== 首页 ========== */
.hero{max-width:980px;margin:50px auto;padding:0 18px;text-align:center}
.hero h1{font-size:clamp(26px,4vw,44px);margin:0 0 12px;color:var(--primary-dark)}
.hero .lead{color:var(--muted);font-size:clamp(14px,1.8vw,18px);margin:0 0 26px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.hero-actions .btn{margin-top:0;min-width:160px;font-size:16px;font-weight:600}
.features{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ========== 卡片 ========== */
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:0 6px 16px rgba(20,40,80,.06)}
.card h3{margin:0 0 6px;color:var(--primary-dark);font-size:17px}
.card.big{padding:22px;margin-bottom:18px}
.card p{margin:0 0 8px}

/* ========== 容器 ========== */
.wrap{max-width:1100px;margin:28px auto;padding:0 18px}
.wrap.narrow{max-width:460px;margin-top:50px}
.wrap h1{font-size:24px;margin:4px 0 20px;color:var(--primary-dark)}
h2{font-size:20px;margin:20px 0 12px;color:var(--primary-dark);font-weight:600}

/* ========== 表单 ========== */
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:4px;font-size:14px;color:#2D5A94}
.form-group input,.form-group select{
  width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);
  font-size:15px;font-family:inherit;background:#fff;transition:border-color .2s}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary);border-width:2px}
label{display:block;margin:12px 0 6px;color:#2D5A94;font-size:14px}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--border);
  border-radius:8px;background:#fff;font-size:15px;color:var(--text);font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary)}

/* ========== 按钮 ========== */
.btn{display:inline-block;padding:12px 24px;border-radius:8px;background:#fff;
  color:var(--primary);border:1px solid var(--primary);font-size:15px;cursor:pointer;
  transition:all .15s;margin-top:8px;text-align:center;text-decoration:none;
  font-family:inherit;min-height:44px;min-width:88px;box-sizing:border-box}
.btn:hover{background:#E6EEF8;color:var(--primary-dark);border-color:var(--primary-dark)}
.btn.primary{background:var(--primary);color:#fff;border:none}
.btn.primary:hover{background:var(--primary-dark);color:#fff}
.btn.danger{background:var(--danger);color:#fff;border:none}
.btn.danger:hover{background:#C73E3E;color:#fff}
.btn.small{padding:6px 14px;font-size:12px;min-height:auto;min-width:auto}
.btn.big{width:100%;padding:14px;font-size:17px;margin-top:14px}
.row-btn{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}

/* ========== 提示 ========== */
.msg{color:var(--danger);min-height:22px;margin:6px 0}
.msg.success{color:var(--success)}
.sub{text-align:center;color:var(--muted);margin-top:14px;font-size:14px}
.stat{display:inline-block;margin-right:18px;padding:6px 12px;background:#E6EEF8;border-radius:999px;color:var(--primary-dark);font-size:13px}
.muted{color:var(--muted);font-size:14px}

/* ========== 加载动画 ========== */
.spinner-wrap{
  position:fixed;inset:0;z-index:9999;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:rgba(255,255,255,.78);
  opacity:0;pointer-events:none;transition:opacity .25s;
}
.spinner-wrap.active{opacity:1;pointer-events:auto}
.spinner{width:44px;height:44px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.spinner-text{margin-top:14px;color:var(--primary-dark);font-size:15px;animation:pulse 1.5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.6}50%{opacity:1}}

/* ========== 座位表 ========== */
.seating-wrap{background:#fff;border:1px solid var(--border);border-radius:12px;padding:24px;margin:20px 0;box-shadow:var(--shadow);position:relative}
.podium{text-align:center;font-size:16px;font-weight:700;color:#555;background:#E8ECF2;border-radius:8px;padding:10px 14px;margin-bottom:18px;letter-spacing:8px}
.seat-grid{display:grid;gap:8px}
.seat{
  position:relative;border-radius:8px;padding:6px 4px;
  min-height:48px;aspect-ratio:1/1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;
  border:1.5px solid transparent;text-align:center;line-height:1.15;
  overflow:hidden;user-select:none;box-sizing:border-box;
}
.seat:hover{transform:translateY(-1px);box-shadow:0 2px 6px rgba(0,0,0,.12)}
.seat.empty{background:var(--seat-empty);border-color:#DEE6F0;color:#9AACBF;font-weight:400;font-size:11px;cursor:default}
.seat.empty:hover{transform:none;box-shadow:none}
.seat.selected{border-color:#FFB300!important;box-shadow:0 0 0 2px rgba(255,179,0,.35)!important}
.seat.male{background:linear-gradient(135deg,var(--male-light),#C5D9F2);border-color:var(--male-mid);color:#1A3A6B}
.seat.female{background:linear-gradient(135deg,var(--female-light),#EDCCDD);border-color:var(--female-mid);color:#6B2A4A}
.seat.nogender{background:#FAFBFD;border-color:#D0D9E8;color:var(--text)}
.seat .name{font-weight:600;font-size:1em;display:block;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.1}
.seat .seat-no{position:absolute;top:2px;right:4px;font-size:9px;opacity:.4;font-weight:400;line-height:1}
.seat .sub{font-size:.75em;opacity:.75;font-weight:400;margin-top:1px;display:block;line-height:1}

/* ========== 全屏模式 ========== */
.fullscreen-overlay{
  position:fixed;inset:0;z-index:10000;background:#fff;
  display:flex;flex-direction:column;overflow:auto
}
.fullscreen-overlay .fs-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 18px;background:var(--bg);border-bottom:1px solid var(--border);
  flex-shrink:0
}
.fullscreen-overlay .fs-header .fs-title{font-size:16px;font-weight:600;color:var(--primary-dark)}
.fullscreen-overlay .fs-header .btn{padding:4px 16px;font-size:13px;min-height:auto;min-width:auto}
.fullscreen-overlay .fs-body{flex:1;padding:24px;display:flex;align-items:flex-start;justify-content:center}
.fullscreen-overlay .fs-body .seat-grid{max-width:1200px;width:100%}
.fullscreen-overlay .seat{min-height:56px;font-size:15px}

/* ========== 导出弹窗 ========== */
.export-dialog{
  position:fixed;inset:0;z-index:10001;background:rgba(30,60,100,.45);
  display:flex;align-items:center;justify-content:center;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .2s
}
.export-dialog.active{opacity:1;pointer-events:auto}
.export-dialog .export-card{background:#fff;border-radius:14px;padding:28px 32px;min-width:340px;max-width:90vw;box-shadow:0 8px 32px rgba(0,0,0,.15)}
.export-dialog .export-card h3{margin:0 0 18px;text-align:center;color:var(--primary-dark);font-size:20px}
.export-dialog .export-card .export-opt{
  display:flex;align-items:center;gap:12px;padding:14px 18px;margin-bottom:10px;
  border:1.5px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:.15s;
  background:#fff
}
.export-dialog .export-card .export-opt:hover{border-color:var(--primary);background:var(--primary-light)}
.export-dialog .export-card .export-opt input[type=radio]{accent-color:var(--primary);width:18px;height:18px;cursor:pointer;flex-shrink:0}
.export-dialog .export-card .export-opt label{flex:1;cursor:pointer;font-size:15px;font-weight:500;margin:0}
.export-dialog .export-card .export-opt .opt-desc{font-size:12px;color:var(--muted);margin-top:3px;font-weight:400}
.export-dialog .export-card .row-btn{justify-content:center;margin-top:18px;gap:12px}

/* ========== 分析报告 ========== */
.analysis{background:#F8FBFF;border:1px solid #D9E5F3;border-radius:12px;padding:14px;margin-top:18px;white-space:pre-wrap;font-size:14px;color:#2D5A94}

/* ========== 弹窗 ========== */
.dialog-overlay{position:fixed;inset:0;z-index:10000;background:rgba(30,60,100,.45);display:flex;align-items:center;justify-content:center;padding:20px}
.dialog-card{background:#fff;border-radius:14px;padding:24px 28px;min-width:340px;max-width:90vw;box-shadow:0 8px 32px rgba(0,0,0,.15)}
.dialog-card h3{margin:0 0 14px;color:var(--primary-dark)}
.dialog-card .form-group{margin-bottom:12px}
.dialog-card .form-group label{display:block;margin-bottom:4px;font-size:13px;color:var(--muted)}
.dialog-card .form-group input{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px}
.dialog-card .form-group input:focus{outline:none;border-color:var(--primary);border-width:2px}
.dialog-card .row-btn{margin-top:14px}

.modal{position:fixed;inset:0;background:rgba(30,60,100,.45);display:flex;align-items:center;justify-content:center;padding:20px;z-index:100}
.modal-body{background:#fff;border-radius:14px;padding:24px 28px;max-width:460px;width:100%;box-shadow:0 16px 40px rgba(20,40,80,.2)}
.modal-body h3{margin:0 0 12px;color:var(--primary-dark);font-size:22px}

/* ========== 班级列表 ========== */
.class-list{display:flex;flex-direction:column;gap:14px;margin-top:12px}
.class-item{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 18px;border:1px solid var(--border);border-radius:10px;background:#fff;flex-wrap:wrap}
.class-item .class-name{font-size:16px;font-weight:600;color:#1f3b64}
.class-item .class-code{color:#5a7a9e;font-size:13px;margin-top:4px}
.class-code-box{display:block;text-align:center;font-size:42px;letter-spacing:12px;font-weight:800;color:var(--primary-dark);margin:12px 0;padding:16px;border:2px dashed var(--primary);border-radius:12px;background:#fafc}

/* ========== 其他 ========== */
hr{border:none;border-top:1px dashed var(--border);margin:16px 0}
.panels{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));margin-top:12px}
.foot{text-align:center;color:var(--muted);padding:30px 14px;font-size:13px}
.subject-row{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 12px}
.chip{padding:6px 12px;border-radius:999px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:14px}
.chip.on{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ========== 响应式 —— 智能适配手机竖屏/横屏（含安卓微信内置浏览器） ========== */

/* 平板及以下通用 */
@media(max-width:1024px){
  .seat{
    font-size:clamp(9px,1.4vw,12px);
    min-height:clamp(30px,6vw,54px);
    padding:3px 2px;border-radius:6px;
  }
  .seat .sub{font-size:clamp(7px,1vw,9px)}
  .seat .seat-no{font-size:clamp(6px,.9vw,8px)}
  .seat-grid{gap:clamp(2px,.6vw,6px)}
  .seating-wrap{padding:14px}
  .podium{font-size:14px;padding:7px 10px;margin-bottom:12px;letter-spacing:4px}
  .fullscreen-overlay .fs-body{padding:10px}
  .fullscreen-overlay .seat{
    font-size:clamp(10px,1.8vw,15px);
    min-height:clamp(40px,8vw,70px);
  }
}

/* 手机竖屏（宽 ≤ 768px，高 > 宽 —— 典型安卓微信竖屏） */
@media(max-width:768px){
  .hero{margin-top:24px}
  .wrap{padding:0 14px;margin-top:16px}
  .wrap h1{font-size:20px}
  .row-btn .btn{flex:1;min-width:auto}
  .top{padding:10px 14px}
  .top .logo{font-size:16px}
  .top nav a{font-size:12px;margin-left:6px}
  .dialog-card,.export-dialog .export-card{min-width:260px;padding:18px 16px}
  .hero-actions{flex-direction:column;align-items:stretch;gap:12px;padding:0 24px}
  .hero-actions .btn{width:100%;min-width:0;margin-top:0}
  /* 竖屏下座位更大 —— 使用 vw 让它随宽度变化 */
  .seat{
    font-size:clamp(9px,2.2vw,13px);
    min-height:clamp(32px,9vw,50px);
    aspect-ratio:1/1;
  }
  .seat .sub{font-size:clamp(7px,1.6vw,10px)}
  .seat .seat-no{font-size:clamp(6px,1.4vw,8px)}
  .seat-grid{gap:clamp(3px,.8vw,6px)}
  .podium{font-size:clamp(11px,2.8vw,15px);padding:7px;margin-bottom:10px;letter-spacing:3px}
  .fullscreen-overlay .fs-header{padding:8px 12px}
  .fullscreen-overlay .fs-title{font-size:13px}
  .fullscreen-overlay .fs-header .btn{padding:4px 10px;font-size:11px}
  .fullscreen-overlay .seat{
    font-size:clamp(10px,2.6vw,14px);
    min-height:clamp(36px,9vw,60px);
    aspect-ratio:1/1;
  }
}

/* 小屏幕手机（≤480px，如老手机） */
@media(max-width:480px){
  .seat{
    font-size:clamp(8px,2.8vw,11px);
    min-height:clamp(28px,10vw,40px);
    padding:2px;
  }
  .seat .seat-no{font-size:7px;top:1px;right:2px}
  .seat-grid{gap:2px}
  .fullscreen-overlay .seat{
    font-size:clamp(9px,3vw,12px);
    min-height:clamp(30px,11vw,40px);
  }
}

/* 横屏模式（宽 > 高，手机翻转）—— 座位更大，利用横向空间 */
@media(max-width:900px) and (orientation:landscape){
  .seat{
    font-size:clamp(10px,1.6vh,14px);
    min-height:clamp(40px,7vh,56px);
    aspect-ratio:1/1;
  }
  .seat-grid{gap:5px}
  .fullscreen-overlay .seat{
    font-size:clamp(11px,1.8vh,15px);
    min-height:clamp(45px,8vh,65px);
  }
}

/* 超窄屏（≤360px，最紧凑） */
@media(max-width:360px){
  .seat{
    font-size:8px;
    min-height:26px;
    padding:1px;
    border-radius:4px;
  }
  .seat .sub{display:none}
  .seat .seat-no{display:none}
  .seat-grid{gap:1px}
  .fullscreen-overlay .seat{
    font-size:9px;min-height:28px;
  }
}

/* ========== 全局反自动填充 ========== */
/* 阻止浏览器（Chrome/Safari/Edge）自动填充黄色背景 */
input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
select:-webkit-autofill,
textarea:-webkit-autofill {
  -webkit-text-fill-color: #1F3B64 !important;
  -webkit-box-shadow: 0 0 0 1000px #FFFFFF inset !important;
  box-shadow: 0 0 0 1000px #FFFFFF inset !important;
  caret-color: #1F3B64 !important;
  transition: background-color 9999s ease-in-out 0s !important;
  background-color: #FFFFFF !important;
}
/* 隐藏 Chrome 凭证自动填充按钮 */
input::-webkit-credentials-auto-fill-button,
input::-webkit-credentials-auto-fill-button:hover,
input::-webkit-credentials-auto-fill-button:focus,
input:-webkit-credentials-auto-fill-button {
  visibility: hidden !important;
  display: none !important;
  pointer-events: none !important;
  position: absolute !important;
  right: 0 !important;
  width: 0 !important;
  height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
}
/* 密码管理器提示图标 */
input::-ms-reveal,
input::-ms-clear {
  display: none !important;
}
/* Firefox */
input:autofill {
  box-shadow: 0 0 0 1000px #FFFFFF inset !important;
  background-color: #FFFFFF !important;
}
/* 标记为自定义表单，让浏览器不认为是登录/注册表单 */
form[data-form-type="custom"],
form[autocomplete="off"] {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"/>');
}
/* readonly 态下的输入框仍然显示普通光标 */
input[readonly] {
  cursor: text;
  background-color: #FFFFFF;
  -webkit-user-select: text;
  user-select: text;
}
/* 全局文本：禁用拼写检查（配合 spellcheck=false） */
input, textarea, select {
  -webkit-appearance: none;
  appearance: none;
}

/* ========== 全局 Loading 遮罩 ========== */
#app-loading-overlay{
  position:fixed;inset:0;background:rgba(15,35,70,.45);
  z-index:9999;display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity .25s ease;
  backdrop-filter:blur(2px);
}
#app-loading-overlay.visible{opacity:1;pointer-events:auto;}
.app-loading-inner{
  background:#fff;border-radius:12px;padding:22px 28px;
  box-shadow:0 10px 30px rgba(0,0,0,.18);
  display:flex;flex-direction:column;align-items:center;gap:14px;
  min-width:160px;
  animation:app-pop .22s ease;
}
@keyframes app-pop{
  from{transform:scale(.92);opacity:0}
  to{transform:scale(1);opacity:1}
}
.app-spinner{
  width:36px;height:36px;border-radius:50%;
  border:3px solid #E8F0FE;border-top-color:#4A90E2;
  animation:app-spin .9s linear infinite;
}
@keyframes app-spin{to{transform:rotate(360deg)}}
.app-loading-text{color:#1F3B64;font-size:14px;font-weight:500;letter-spacing:1px}

/* ========== 全局 Toast 提示 ========== */
.app-toast{
  position:fixed;top:18px;left:50%;transform:translate(-50%,-16px);
  background:#1F3B64;color:#fff;padding:10px 20px;border-radius:8px;
  font-size:14px;box-shadow:0 6px 18px rgba(0,0,0,.18);
  opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease;
  z-index:10000;max-width:86vw;text-align:center;
}
.app-toast.visible{opacity:1;transform:translate(-50%,0);pointer-events:auto}
.app-toast.error{background:#C73E3E}
.app-toast.success{background:#4CAF50}