/* app.css — TASK-01 前端视觉层
   设计语言：Stripe 优雅风（视觉锚点 design-reference/003-stripe-elegant.html）
   要点：深色底 + 顶部紫光晕 + 圆角卡片 + 300 字重；不做毛玻璃/动画库/图片 */

/* ===== 设计 tokens（TASK-01 4.0.1 冻结，照抄） ===== */
:root {
  /* 背景/表面 */
  --bg: #0a0a0f;                    /* 页面底 */
  --panel: rgba(255,255,255,0.03);  /* 卡片/输入容器底 */
  --panel-hover: rgba(255,255,255,0.07); /* 卡片 hover（若有） */
  --border: rgba(255,255,255,0.08); /* 边框 */
  --gradient-glow: radial-gradient(ellipse at center, rgba(155,140,255,0.14) 0%, rgba(240,84,61,0.05) 45%, transparent 70%); /* 顶部紫光晕（body::before 固定层，克制不喧宾） */
  /* 文字 */
  --text: #f5f5f7;                  /* 主文字 */
  --text-2: rgba(245,245,247,0.75); /* 次级 */
  --text-3: rgba(245,245,247,0.5);  /* 三级/占位 */
  /* 强调 */
  --accent: #f0543d;                /* 红橙——隐藏成本行专用（项目冻结色，勿改） */
  --violet: #9b8cff;                /* 主 CTA 渐变起点/焦点 */
  --violet-deep: #6b5ae8;           /* 主 CTA 渐变终点 */
  --success: #3fb950;               /* 数据新鲜度圆点 */
  --warning: #e2b93d;               /* 预警文字 */
  --warning-bg: rgba(226,185,61,0.07);
  --warning-border: rgba(226,185,61,0.2);
  /* 形状/字体 */
  --radius: 10px;                   /* 大卡片圆角 */
  --radius-input: 8px;              /* 输入/按钮圆角 */
  --font: 'Source Sans 3', system-ui, -apple-system, sans-serif;  /* 300 字重优雅 */
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace; /* 金额/数据 */
}

/* ===== 基础 ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-weight: 300;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* 顶部柔和紫光晕：固定层，pointer-events:none，内容 z-index:1 */
body::before {
  content: '';
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: 0;
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 820px;                 /* 宽屏内容占比 ≥75% */
  margin: 0 auto;
  padding: 32px 20px 70px;
}

/* ===== 页头 ===== */
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.logo { font-size: 18px; font-weight: 500; letter-spacing: -0.2px; }
.logo .accent { color: var(--accent); }
.freshtag { display: flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 400; color: var(--text-3); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--success); box-shadow: 0 0 8px rgba(63,185,80,0.6); }

/* ===== Hero：低调标题 + 一行说明，表单优先 ===== */
.hero { margin: 32px 0 20px; }      /* hero 上边距 32px，紧凑密度 */
.hero h1 { font-size: 30px; font-weight: 400; letter-spacing: -0.7px; line-height: 1.15; }
.hero p { margin-top: 6px; font-size: 15px; font-weight: 300; color: var(--text-2); max-width: 560px; }

.sec-label {
  font-size: 12px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-3); margin: 18px 0 10px;
}

/* ===== 表单卡片 ===== */
.form-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }

/* 移动端优先：默认单列，≥600px 双列 */
.grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field.full, .row, .calc-btn, .estimate, .vat-field { grid-column: 1 / -1; }
.lbl { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.field label { font-size: 13px; font-weight: 400; color: var(--text-2); }
.guess-mark { font-size: 12px; color: var(--text-3); white-space: nowrap; }

/* 输入/下拉：浅底 + 边框 + 8px 圆角 + 15px/300；focus 变紫；触控目标 ≥44px */
.field select, .field input, .unlock-code {
  width: 100%;
  min-height: 44px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 300;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.field select:focus, .field input:focus, .unlock-code:focus {
  border-color: var(--violet);
  background: rgba(255,255,255,0.06);
}
.field select {
  appearance: none;
  color-scheme: dark;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23808080' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 34px;
}
/* 原生下拉选项：深色主题（color-scheme:dark 让浏览器按深色渲染弹出列表） */
.field select option {
  background-color: #12121a;
  color: #f5f5f7;
}
/* 下拉弹出列表：细滚动条 + 深色 + 左对齐（修复右对齐/粗滚动条不美观） */
.field select {
  text-align: left;
  scrollbar-width: thin;
  scrollbar-color: #4a4a55 #12121a;
}
.field select::-webkit-scrollbar { width: 6px; }
.field select::-webkit-scrollbar-thumb { background: #4a4a55; border-radius: 3px; }
.field select::-webkit-scrollbar-track { background: #12121a; }
.field .hint { font-size: 12px; color: var(--text-3); }

/* 商品价 + 币种行 */
.row { display: grid; grid-template-columns: 1fr; gap: 14px; }
.row .field.cur select { font-family: var(--mono); font-size: 14px; text-align: left; }
/* 自定义币种下拉（原生弹出列表样式不可控，改用自定义按钮+列表） */
.cur-sel { position: relative; }
.cur-sel-btn {
  width: 100%; min-height: 44px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text);
  font-family: var(--mono); font-size: 14px; font-weight: 300;
  padding: 10px 14px; padding-right: 34px;
  text-align: left; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23808080' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center;
  transition: border-color 0.2s, background 0.2s;
}
.cur-sel-btn:hover { border-color: var(--violet); }
.cur-sel-btn.open { border-color: var(--violet); background: rgba(255,255,255,0.06); }
.cur-sel-list {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 30;
  max-height: 220px; overflow-y: auto;
  background: #12121a; border: 1px solid var(--border); border-radius: var(--radius-input);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  scrollbar-width: thin; scrollbar-color: #4a4a55 #12121a;
}
.cur-sel-list::-webkit-scrollbar { width: 6px; }
.cur-sel-list::-webkit-scrollbar-thumb { background: #4a4a55; border-radius: 3px; }
.cur-sel-opt {
  padding: 9px 14px; font-family: var(--mono); font-size: 13px; color: var(--text);
  cursor: pointer;
}
.cur-sel-opt:hover { background: rgba(155,140,255,0.12); }
.cur-sel-opt.sel { color: var(--violet); background: rgba(155,140,255,0.08); }

/* 运费行：输入 + "不确定运费？"展开按钮 */
.ship-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.ship-row input { flex: 1 1 150px; }
.anchor-toggle {
  min-height: 44px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 400;
  padding: 8px 14px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.anchor-toggle:hover { background: rgba(255,255,255,0.07); color: var(--text); }

/* 锚点表容器：默认折叠，表格行由 TASK-03 渲染 */
.anchor-panel {
  display: none;
  margin-top: 10px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
}
.anchor-panel.show { display: block; }

/* 国旗快捷条 */
.flag-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.flag-btn {
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.10);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.flag-btn:hover { background: var(--panel-hover); border-color: var(--violet); }

/* VAT 联动区：默认隐藏，TASK-03 按国家/平台显示 */
.vat-field { display: none; }
.vat-field.show { display: flex; }
.check { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.check input { width: 16px; height: 16px; min-height: 0; accent-color: var(--violet); }
.vat-note {
  font-size: 13px; color: var(--text-2);
  background: rgba(155,140,255,0.08);
  border: 1px solid rgba(155,140,255,0.2);
  border-radius: var(--radius-input);
  padding: 10px 14px;
}

/* 主 CTA：紫渐变 + 白字 + 柔和投影 */
.calc-btn {
  width: 100%;
  min-height: 48px;
  margin-top: 6px;
  padding: 12px 18px;
  background: linear-gradient(135deg, var(--violet), var(--violet-deep));
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(155,140,255,0.25);
  transition: opacity 0.2s, transform 0.1s;
}
.calc-btn:hover { opacity: 0.92; }
.calc-btn:active { transform: scale(0.99); }

/* 实时估算行 */
.estimate { margin-top: 14px; font-size: 14px; font-weight: 300; color: var(--text-3); font-family: var(--mono); }
.estimate strong { color: var(--text); font-weight: 500; }

/* ===== 结果卡片：Total 第一行加粗 → 隐藏成本第二行红橙 → 明细折叠 ===== */
.result { display: none; margin-top: 16px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.result.show { display: block; }
.r-row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 6px 0; font-size: 15px; }
.r-row .k { color: var(--text-2); font-weight: 300; }
.r-row .v { font-family: var(--mono); font-size: 14px; color: var(--text); font-weight: 400; text-align: right; }
.r-row.total { border-top: 1px solid var(--border); margin-top: 7px; padding-top: 11px; }
.r-row.total .k { font-weight: 500; color: var(--text); }
.r-row.total .v { font-size: 22px; font-weight: 500; letter-spacing: -0.5px; }
.r-row.hidden .v { color: var(--accent); font-weight: 500; }
.r-row.hidden .v small { font-weight: 300; color: var(--text-3); font-size: 13px; }

/* 阈值预警条 */
.warning {
  margin-top: 11px; font-size: 13px;
  color: var(--warning);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-input);
  padding: 9px 14px;
}

/* 明细分解：默认折叠 */
.breakdown { display: none; margin-top: 9px; border-top: 1px solid var(--border); padding-top: 8px; }
.breakdown.show { display: block; }
.breakdown .r-row { padding: 4px 0; font-size: 13px; }

/* 复制摘要按钮（文本由 TASK-03 组装） */
.copy-btn {
  min-height: 44px;
  margin-top: 10px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.copy-btn:hover { background: rgba(255,255,255,0.07); color: var(--text); }
.trial-line {
  font-size: 11px;
  color: rgba(245,245,247,0.5);
  margin: 0 0 6px;
  line-height: 1.4;
  text-align: center;
}
.copy-hint {
  font-size: 11px;
  color: rgba(245,245,247,0.5);
  margin-top: 4px;
  line-height: 1.4;
}

/* ===== 购物袋卡片 ===== */
.bag {
  margin-top: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  grid-column: 1 / -1; /* 在表单网格中占整行（移到计算按钮上方后） */
}
.bag h3 { font-size: 14px; font-weight: 500; margin-bottom: 8px; color: var(--text-2); }
.bag-item { display: flex; justify-content: space-between; gap: 12px; font-size: 14px; font-weight: 300; color: var(--text-2); padding: 4px 0; }
.bag-item .p { font-family: var(--mono); font-size: 13px; color: var(--text); }
.bag-total { display: flex; justify-content: space-between; border-top: 1px solid var(--border); margin-top: 6px; padding-top: 10px; font-weight: 500; color: var(--text); }
.bag-total .v { font-family: var(--mono); font-size: 16px; }
.bag-add {
  min-height: 44px;
  margin-top: 8px;
  padding: 7px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.bag-add:hover { background: var(--panel-hover); color: var(--text); }

/* 购物袋：件标签罐（多件同一水平面左右切换编辑） */
.bag-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 10px;
  padding: 2px 0;
  scrollbar-width: thin;
}
.bag-tab {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 300;
  cursor: pointer;
  white-space: nowrap;
}
.bag-tab:hover { background: var(--panel-hover); color: var(--text); }
.bag-tab.active {
  background: rgba(155,140,255,0.12);
  border-color: var(--violet);
  color: var(--text);
}

/* ===== 解锁卡：渐变底 + 白 CTA ===== */
.unlock {
  margin-top: 18px;
  text-align: center;
  padding: 20px;
  background: linear-gradient(160deg, rgba(155,140,255,0.12), rgba(240,84,61,0.06));
  border: 1px solid rgba(155,140,255,0.2);
  border-radius: var(--radius);
}
.unlock-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  background: #fff;
  color: #0a0a0f;
  padding: 9px 24px;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}
.unlock-btn:hover { opacity: 0.88; }
.strike { color: var(--text-3); text-decoration: line-through; font-size: 14px; }
.price { font-size: 20px; font-weight: 500; letter-spacing: -0.5px; }
.unlock-code { margin-top: 12px; max-width: 280px; }

/* ===== FAQ / 法务 ===== */
.faq, .legal, .changelog { margin-top: 18px; }
.faq details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { font-size: 15px; font-weight: 400; cursor: pointer; color: var(--text); }
.legal-h { font-size: 15px; font-weight: 500; color: var(--text); margin-bottom: 4px; }
.faq details p, .legal p, .changelog p { margin-top: 6px; font-size: 14px; font-weight: 300; color: var(--text-2); line-height: 1.7; }
.legal-note { margin-top: 22px; font-size: 13px; color: var(--text-3); }

/* ===== 页脚 ===== */
.footer {
  margin-top: 34px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
  font-size: 13px;
  font-weight: 300;
  color: var(--text-3);
  line-height: 1.9;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-bottom: 6px; }
.footer-links a { color: var(--text-3); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--text); }
.footer .wm { font-family: var(--mono); font-size: 12px; margin-top: 8px; color: rgba(245,245,247,0.35); }

/* ===== 响应式：≥600px 双列，375px 单列不溢出 ===== */
@media (min-width: 600px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .row { grid-template-columns: 1fr 120px; }
}
@media (max-width: 480px) {
  .wrap { padding: 28px 16px 60px; }
  .hero h1 { font-size: 27px; }
  .form-card { padding: 18px; }
}