:root { --bg:#f5ede0; --text:#3b2314; --muted:#9a7a5a; --accent:#8b4c1e; --border:#d9c4a8; }

@font-face {
  font-family: 'Cubic 11';
  src: url('https://cdn.jsdelivr.net/gh/ACh-K/Cubic-11@main/fonts/web/Cubic_11.woff2') format('woff2');
  font-weight: normal;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.7;
}
a { color: inherit; text-decoration: none; }

/* ── 顶栏 ── */
nav {
  position: sticky; top: 0; z-index: 100;
  padding: 16px 40px; display: flex; justify-content: space-between; align-items: center;
  border-bottom: 2px solid var(--border); background: var(--bg);
}
.logo {
  font-family: 'Cubic 11', monospace; font-size: 1.15rem;
  font-weight: normal; letter-spacing: 0.05em; color: var(--text);
}
.nav-center { position: absolute; left: 50%; transform: translateX(-50%); pointer-events: none; }
.nav-right { display: flex; align-items: center; gap: 24px; }
.nav-link {
  font-family: 'Cubic 11', monospace; font-size: 0.8rem;
  color: var(--muted); transition: color 0.2s;
  display: flex; align-items: center; gap: 5px;
}
.nav-link svg { width: 14px; height: 14px; flex-shrink: 0; }
.nav-link:hover, .nav-link.active { color: var(--accent); }
.nav-auth {
  font-family: 'Cubic 11', monospace; font-size: 0.8rem;
  color: var(--muted); background: none; border: 1.5px solid var(--border);
  padding: 6px 14px; cursor: pointer; transition: all 0.2s;
}
.nav-auth:hover { border-color: var(--accent); color: var(--accent); }
.nav-auth.logged-in { color: var(--accent); border-color: var(--accent); }
.nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--text); }
.nav-mobile-menu {
  display: none; position: fixed; inset: 0; background: var(--bg);
  z-index: 200; flex-direction: column; align-items: center; justify-content: center; gap: 36px;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu .nav-link { font-size: 1rem; }
.nav-mobile-close { position: absolute; top: 20px; right: 24px; font-size: 1.4rem; cursor: pointer; background: none; border: none; color: var(--text); }

/* ── 登录弹窗 ── */
.login-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(59,35,20,0.4); z-index: 300; align-items: center; justify-content: center;
}
.login-overlay.open { display: flex; }
.login-box {
  background: var(--bg); border: 2px solid var(--accent);
  padding: 36px 32px; max-width: 360px; width: 90%;
}
.login-box h2 {
  font-family: 'Cubic 11', monospace; font-size: 1.1rem;
  color: var(--accent); margin-bottom: 12px; line-height: 1.7;
}
.login-box p { font-size: 0.88rem; color: var(--muted); margin-bottom: 20px; line-height: 1.6; }
.login-box input {
  width: 100%; padding: 12px 14px; border: 2px solid var(--border);
  background: white; font-family: inherit; font-size: 0.95rem;
  color: var(--text); outline: none; margin-bottom: 12px;
}
.login-box input:focus { border-color: var(--accent); }
.login-box .btn-primary { width: 100%; }

/* ── 按钮 ── */
.btn-primary {
  display: inline-block; padding: 14px 32px;
  background: var(--accent); color: white;
  border: none; font-family: inherit; font-size: 1rem;
  cursor: pointer; transition: opacity 0.2s; text-align: center;
}
.btn-primary:hover { opacity: 0.85; }
.btn-outline {
  display: inline-block; padding: 12px 28px;
  background: none; color: var(--accent);
  border: 2px solid var(--accent); font-family: inherit;
  font-size: 0.95rem; cursor: pointer; transition: all 0.2s;
}
.btn-outline:hover { background: var(--accent); color: white; }

/* ── 表单 ── */
.form-group { margin-bottom: 20px; }
.form-group:last-child { margin-bottom: 0; }
label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 8px; }
.field-hint { font-size: 0.82rem; color: var(--muted); margin-top: 6px; }
input[type="text"], input[type="number"], select {
  width: 100%; padding: 12px 16px; border: 2px solid var(--border);
  background: white; font-family: inherit; font-size: 0.95rem;
  color: var(--text); outline: none; transition: border-color 0.2s; border-radius: 0;
}
input:focus, select:focus { border-color: var(--accent); }
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239a7a5a' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px;
}
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.radio-group { display: flex; flex-direction: column; gap: 10px; }
.radio-option { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: 0.95rem; }
.radio-option input { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }
.ratio-examples { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.ratio-chip {
  padding: 6px 12px; border: 1.5px solid var(--border); background: var(--bg);
  font-size: 0.85rem; cursor: pointer; transition: all 0.15s;
}
.ratio-chip:hover { border-color: var(--accent); color: var(--accent); }

/* ── 卡片 ── */
.card { border: 2px solid var(--border); padding: 28px; background: white; }
.note { background: #ecddc8; border-left: 4px solid var(--accent); padding: 20px 24px; }
.section-label {
  font-family: 'Cubic 11', monospace; font-size: 0.75rem;
  color: var(--accent); letter-spacing: 0.08em; margin-bottom: 20px;
}

/* ── 底部联系栏 ── */
.contact-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg); border-top: 2px solid var(--border);
  padding: 12px 40px; display: flex; align-items: center;
  justify-content: flex-end; gap: 20px; z-index: 90;
}
.contact-bar span { font-size: 0.82rem; color: var(--muted); }
.contact-icon {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.82rem; color: var(--muted); transition: color 0.2s; cursor: pointer;
}
.contact-question {
  border: none; background: none; padding: 0; font-family: inherit;
}
.contact-icon:hover { color: var(--accent); }
.contact-icon svg { width: 18px; height: 18px; flex-shrink: 0; }

.question-popover {
  display: none; position: fixed; right: 24px; bottom: 64px;
  width: min(340px, calc(100vw - 32px)); z-index: 120;
  background: white; border: 2px solid var(--accent);
  box-shadow: 0 10px 26px rgba(59,35,20,0.16);
  padding: 20px;
}
.question-popover.open { display: block; }
.question-popover h2 {
  font-family: 'Cubic 11', monospace; font-size: 0.95rem;
  color: var(--accent); margin-bottom: 14px; line-height: 1.6;
}
.question-popover textarea {
  width: 100%; min-height: 108px; resize: vertical;
  padding: 12px 14px; border: 2px solid var(--accent);
  background: white; font-family: inherit; font-size: 0.9rem;
  color: var(--text); outline: none; margin-bottom: 12px;
}
.question-popover textarea:focus { border-color: var(--accent); }
.question-send {
  width: 100%; padding: 11px 12px; font-size: 0.9rem; text-align: center;
}
.question-send:disabled {
  opacity: 0.65; cursor: wait;
}
.question-close {
  position: absolute; top: 10px; right: 12px;
  border: none; background: none; color: var(--muted);
  font-size: 1.25rem; cursor: pointer; line-height: 1;
}
.question-status {
  display: none; margin-top: 10px; font-size: 0.78rem; color: var(--accent);
}
.question-status.error { color: #b34a32; }
.question-status.show { display: block; }

/* ── footer ── */
footer {
  border-top: 2px solid var(--border);
  padding: 28px 40px 80px;
  text-align: center; font-size: 0.82rem; color: var(--muted);
}

/* ── 响应式 ── */
@media (max-width: 600px) {
  nav { padding: 12px 16px; }
  .logo { font-size: 0.85rem; letter-spacing: 0; }
  .nav-center { display: none; }
  .nav-right { display: none; }
  .nav-hamburger { display: flex; }

  /* 防止 iOS 表单自动缩放 */
  input[type="text"], input[type="number"], select, textarea {
    font-size: 16px !important;
  }

  /* 按钮 */
  .btn-primary, .btn-outline { padding: 13px 20px; font-size: 0.95rem; width: 100%; display: block; }

  /* 底部联系栏：隐藏文字标签，只留图标 */
  .contact-bar {
    padding: 10px 20px;
    gap: 16px;
    justify-content: center;
  }
  .contact-bar > span { display: none; }
  .contact-icon { font-size: 0; gap: 0; }
  .contact-icon svg { width: 22px; height: 22px; }
  .contact-question { font-size: 0; }
  .question-popover {
    left: 16px; right: 16px; bottom: 64px;
    width: auto; padding: 18px;
  }

  /* footer */
  footer { padding: 20px 20px 72px; }

  /* 卡片/区块 padding 收窄 */
  .card { padding: 20px; }
  .note { padding: 16px 18px; }
}