/* ============================================================
   SHANGMEIQI / 尚美琪 —— 基础设计系统
   黑白极简 · 前卫机能 · 参考 明日方舟：终末地 UI 审美
   ============================================================ */
:root {
  --bg: #f4f4f5;
  --bg2: #ffffff;
  --panel: #ffffff;
  --panel2: #f1f1f3;
  --panel3: #e8e8eb;
  --line: #d9d9de;
  --line2: #ababb4;
  --text: #1c1c20;
  --text2: #575760;
  --text3: #8b8b95;
  --accent: #101013;
  --danger: #e5484d;
  --ok: #86f0b4;
  --mono: 'Cascadia Mono', Consolas, 'SF Mono', Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  --radius: 0;
  --header-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: #101013; color: #fff; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }
img { display: block; max-width: 100%; }


/* ---- 品牌标记（旋转方框，用于导航/登录/侧栏） ---- */
.brand-mark {
  width: 22px; height: 22px;
  border: 1.5px solid #101013;
  position: relative;
  transform: rotate(45deg);
  flex-shrink: 0;
}
.brand-mark::after { content: ''; position: absolute; inset: 4px; border: 1px solid #101013; }

/* ---- 微标签 ---- */
.label-en {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text3);
}
.label-en.light { color: var(--text2); }

/* ---- 按钮 ---- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 22px;
  height: 42px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line2);
  font-size: 13px;
  letter-spacing: 0.12em;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: all 0.18s ease;
  white-space: nowrap;
}
.btn:hover { background: #101013; color: #fff; border-color: #101013; }
.btn:disabled { opacity: 0.35; pointer-events: none; }
.btn.primary { background: #101013; color: #fff; border-color: #101013; }
.btn.primary:hover { background: transparent; color: #101013; }
.btn.danger:hover { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn.sm { height: 34px; padding: 0 16px; font-size: 12px; clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px); }
.btn.ghost { border-color: var(--line); color: var(--text2); }
.btn.ghost:hover { border-color: var(--text); color: var(--text); background: var(--panel2); }

/* ---- 输入框 ---- */
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--text3);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.input, .textarea, .select {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 11px 14px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s ease;
  border-radius: 0;
}
.input:focus, .textarea:focus, .select:focus { border-color: var(--text); }
.input::placeholder, .textarea::placeholder { color: var(--text3); }
.textarea { resize: vertical; min-height: 90px; }
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--text3) 50%), linear-gradient(135deg, var(--text3) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; }
.select option { background: var(--panel2); color: var(--text); }

/* ---- 面板 ---- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  position: relative;
}
.panel::before, .panel::after { content: ''; position: absolute; width: 14px; height: 14px; pointer-events: none; }
.panel::before { top: -1px; left: -1px; border-top: 1px solid var(--text3); border-left: 1px solid var(--text3); }
.panel::after { bottom: -1px; right: -1px; border-bottom: 1px solid var(--text3); border-right: 1px solid var(--text3); }

/* ---- 区块标题 ---- */
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 26px;
}
.sec-head .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text3);
  letter-spacing: 0.1em;
}
.sec-head h2 { font-size: 22px; font-weight: 600; letter-spacing: 0.06em; }
.sec-head .rule { flex: 1; height: 1px; background: linear-gradient(90deg, var(--line2), transparent); align-self: center; }
.sec-head .sub { font-family: var(--mono); font-size: 11px; letter-spacing: 0.24em; color: var(--text3); text-transform: uppercase; }

/* ---- 通用布局 ---- */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---- 网格背景 ---- */
.grid-bg {
  background-image:
    linear-gradient(rgba(0,0,0,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ---- 扫线效果 ---- */
.scanlines::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,0.02) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line2); }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ---- 动画 ---- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
.fade-up { animation: fadeUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) both; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---- Toast ---- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%) translateY(20px);
  background: #101013;
  color: #fff;
  padding: 12px 22px;
  font-size: 13px;
  letter-spacing: 0.06em;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 3000;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); color: #fff; }

/* ---- 空状态 ---- */
.empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--text3);
  font-family: var(--mono);
  letter-spacing: 0.2em;
}
.empty .big { font-size: 40px; color: var(--line2); margin-bottom: 16px; }