@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700;900&display=swap');

:root {
  --paper:      #fdf8f0;
  --paper-dark: #ede4cc;
  --ink:        #1c0f07;
  --ink-mid:    #4a2c1a;
  --ink-light:  #8a6a54;
  --vermillion: #b5281c;
  --vermillion-h: #d4472a;
  --gold:       #b8922e;
  --bamboo:     #3d6b4a;
  --border:     rgba(74, 44, 26, 0.22);
  --shadow:     rgba(28, 15, 7, 0.10);
  --radius:     4px;
  --tr:         0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
  min-height: 100vh;
}

/* ── Navigation ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(253, 248, 240, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 0 48px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-size: 1.15rem; font-weight: 700;
  color: var(--ink); text-decoration: none;
  letter-spacing: 0.08em;
  display: flex; align-items: center; gap: 8px;
}
.nav-logo .seal { color: var(--vermillion); font-size: 1.3rem; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a {
  color: var(--ink-mid); text-decoration: none;
  font-size: 0.92rem; letter-spacing: 0.1em;
  transition: color var(--tr);
  position: relative; padding-bottom: 4px;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 1px; background: var(--vermillion);
  transition: width var(--tr);
}
.nav-links a:hover, .nav-links a.active { color: var(--vermillion); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* ── Layout ── */
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.section-title {
  font-size: 1.5rem; font-weight: 700;
  color: var(--ink); letter-spacing: 0.18em;
  margin-bottom: 8px;
  display: flex; align-items: center; gap: 10px;
}
.section-title::before { content: '▌'; color: var(--vermillion); font-size: 1.1rem; }
.section-subtitle { color: var(--ink-light); font-size: 0.88rem; letter-spacing: 0.06em; margin-bottom: 32px; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 24px; font-family: inherit; font-size: 0.92rem;
  letter-spacing: 0.1em; border-radius: var(--radius);
  cursor: pointer; transition: all var(--tr); border: none; text-decoration: none;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--vermillion); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--vermillion-h); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(181,40,28,.28); }
.btn-secondary { background: transparent; color: var(--ink-mid); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { border-color: var(--ink-mid); background: var(--paper-dark); }
.btn-gold { background: var(--gold); color: white; }
.btn-gold:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }
.btn-bamboo { background: var(--bamboo); color: white; }
.btn-bamboo:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }

/* ── Input ── */
.input {
  width: 100%; padding: 11px 16px;
  font-family: inherit; font-size: 0.97rem;
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--ink);
  transition: border-color var(--tr); outline: none;
}
.input:focus { border-color: var(--vermillion); box-shadow: 0 0 0 3px rgba(181,40,28,.07); }
textarea.input { resize: vertical; min-height: 90px; }

/* ── Loading ── */
.loading {
  display: flex; justify-content: center; align-items: center;
  padding: 40px; color: var(--ink-light); gap: 10px; font-size: 0.9rem;
}
.loading-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--vermillion);
  animation: ldot 1.4s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: .2s; }
.loading-dot:nth-child(3) { animation-delay: .4s; }
@keyframes ldot { 0%,80%,100%{transform:scale(.55);opacity:.35} 40%{transform:scale(1);opacity:1} }

/* ── Toast ── */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--ink); color: var(--paper);
  padding: 11px 20px; border-radius: var(--radius);
  font-size: 0.88rem; opacity: 0; transform: translateY(12px);
  transition: all .3s; z-index: 1000; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(28,15,7,.52);
  backdrop-filter: blur(4px); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--paper); border: 1px solid var(--border);
  border-radius: 8px; max-width: 700px; width: 100%;
  max-height: 88vh; overflow-y: auto; padding: 40px;
  transform: scale(.96) translateY(16px); transition: transform .3s; position: relative;
}
.modal-overlay.open .modal { transform: scale(1) translateY(0); }
.modal-close {
  position: absolute; top: 14px; right: 18px;
  background: none; border: none; font-size: 1.4rem;
  cursor: pointer; color: var(--ink-light); transition: color var(--tr);
}
.modal-close:hover { color: var(--vermillion); }
.modal-title { font-size: 1.9rem; font-weight: 700; letter-spacing: 0.12em; margin-bottom: 4px; }
.modal-author { color: var(--ink-light); font-size: 0.9rem; letter-spacing: 0.08em; margin-bottom: 24px; }
.modal-poem-text { font-size: 1.15rem; line-height: 2.5; color: var(--ink-mid); letter-spacing: 0.06em; text-align: center; }
.modal-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }

/* ── Info cards ── */
.info-box {
  margin-top: 20px; padding: 22px 26px;
  background: var(--paper-dark); border-radius: var(--radius);
  border-left: 3px solid var(--gold);
}
.info-box.green { border-left-color: var(--bamboo); }
.info-box h4 { font-size: 0.85rem; letter-spacing: 0.15em; margin-bottom: 12px; color: var(--gold); }
.info-box.green h4 { color: var(--bamboo); }
.info-box-text { white-space: pre-wrap; line-height: 2; color: var(--ink-mid); font-size: 0.93rem; }

/* ── Score display ── */
.score-big { font-size: 4rem; font-weight: 900; color: var(--vermillion); text-align: center; line-height: 1; margin: 8px 0 4px; }
.score-label { text-align: center; font-size: 0.8rem; color: var(--ink-light); letter-spacing: 0.12em; }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border); padding: 28px 48px;
  text-align: center; color: var(--ink-light); font-size: 0.82rem;
  letter-spacing: 0.06em; margin-top: 80px;
}
.footer a { color: var(--ink-light); text-decoration: none; }
.footer a:hover { color: var(--vermillion); }

/* ── Responsive ── */
@media (max-width: 720px) {
  .nav { padding: 0 16px; }
  .nav-logo span.label { display: none; }
  .nav-links { gap: 18px; }
  .container { padding: 0 14px; }
  .footer { padding: 24px 16px; }
  .modal { padding: 24px 18px; }
}
@media (max-width: 480px) {
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.82rem; }
}