/* ===== 星空善学 · 星空主题 ===== */
* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg: #0b0e21;
  --bg2: #131742;
  --bg3: #1a1f4e;
  --card: #1c2050;
  --card2: #252b6b;
  --border: #2e3580;
  --text: #d5d8f0;
  --text2: #8b90b8;
  --text3: #5c6180;
  --accent: #7c6ff0;
  --accent2: #a78bfa;
  --gold: #f0c040;
  --green: #34d399;
  --red: #f87171;
  --blue: #60a5fa;
  --pink: #f472b6;
  --radius: 12px;
}
html { font-size: 15px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== 星星背景 ===== */
.stars {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
}
.star {
  position: absolute;
  width: 2px; height: 2px;
  background: #fff;
  border-radius: 50%;
  opacity: 0.6;
  animation: twinkle 3s ease-in-out infinite;
}
.star:nth-child(odd) { animation-delay: 1.5s; }
.star:nth-child(3n) { width:3px; height:3px; opacity:0.8; }
@keyframes twinkle { 0%,100%{opacity:0.3} 50%{opacity:1} }

/* ===== 顶栏 ===== */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,14,33,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  font-size: 1.25rem; font-weight: 700; color: var(--accent2);
  letter-spacing: 1px;
}
.logo span { color: var(--gold); }
.topbar-stats {
  display: flex; gap: 16px; align-items: center;
}
.stat-pill {
  display: flex; align-items: center; gap: 5px;
  background: var(--card); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 20px;
  font-size: 0.85rem;
}
.stat-pill .icon { font-size: 1.1rem; }
.stat-pill .num { font-weight: 700; color: var(--gold); }

/* ===== 首页 hero ===== */
.hero {
  text-align: center;
  padding: 60px 20px 40px;
  position: relative; z-index: 1;
}
.hero h1 {
  font-size: 2.4rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent2), var(--gold));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}
.hero p {
  color: var(--text2); font-size: 1.05rem; max-width: 520px;
  margin: 0 auto 28px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ===== 按钮 ===== */
.btn {
  padding: 11px 28px; border-radius: 30px; border: none;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: all 0.2s;
}
.btn:active { transform: scale(0.96); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 20px rgba(124,111,240,0.35);
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(124,111,240,0.5); }
.btn-secondary {
  background: var(--card); color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent2); }
.btn-gold {
  background: linear-gradient(135deg, var(--gold), #e8a020);
  color: #1a1a2e; font-weight: 700;
}

/* ===== 星座技能树 ===== */
.tree-section {
  max-width: 800px; margin: 0 auto; padding: 30px 20px 60px;
  position: relative; z-index: 1;
}
.tree-section h2 {
  text-align: center; font-size: 1.5rem; margin-bottom: 8px; color: var(--accent2);
}
.tree-section > p {
  text-align: center; color: var(--text2); margin-bottom: 36px;
}
.subject-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  overflow: hidden;
}
.subject-header {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 22px; cursor: pointer;
  transition: background 0.2s;
}
.subject-header:hover { background: var(--card2); }
.subject-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  background: var(--bg3);
  flex-shrink: 0;
}
.subject-info { flex: 1; }
.subject-info h3 { font-size: 1.15rem; margin-bottom: 3px; }
.subject-info p { font-size: 0.82rem; color: var(--text2); }
.subject-progress {
  text-align: right; min-width: 70px;
}
.subject-progress .pct {
  font-size: 1.3rem; font-weight: 700; color: var(--accent2);
}
.subject-progress .lbl {
  font-size: 0.75rem; color: var(--text3);
}
.subject-chevron {
  color: var(--text3); font-size: 1.2rem; transition: transform 0.3s;
}
.subject-card.open .subject-chevron { transform: rotate(180deg); }

/* 章节列表 */
.chapter-list {
  display: none;
  border-top: 1px solid var(--border);
}
.subject-card.open .chapter-list { display: block; }
.chapter-item {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 22px 14px 84px;
  cursor: pointer;
  transition: background 0.15s;
  border-bottom: 1px solid rgba(46,53,128,0.3);
}
.chapter-item:hover { background: var(--card2); }
.chapter-item:last-child { border-bottom: none; }
.chapter-icon { font-size: 1.3rem; }
.chapter-info { flex: 1; }
.chapter-info h4 { font-size: 0.95rem; margin-bottom: 2px; }
.chapter-info p { font-size: 0.78rem; color: var(--text3); }
.chapter-stars { color: var(--gold); font-size: 0.95rem; letter-spacing: 2px; }
.chapter-stars .empty { color: var(--text3); }

/* ===== 练习界面 ===== */
.quiz-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: var(--bg);
  display: none; flex-direction: column;
}
.quiz-overlay.show { display: flex; }
.quiz-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--border);
}
.quiz-close {
  background: none; border: none; color: var(--text2);
  font-size: 1.5rem; cursor: pointer; padding: 4px 10px;
}
.quiz-progress-wrap {
  flex: 1; margin: 0 20px; height: 8px;
  background: var(--card); border-radius: 4px; overflow: hidden;
}
.quiz-progress {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 4px; transition: width 0.4s;
}
.quiz-hearts {
  font-size: 1.15rem; color: var(--red);
}
.quiz-body {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 30px 20px;
}
.quiz-question {
  max-width: 560px; width: 100%;
  text-align: center; margin-bottom: 32px;
}
.quiz-question .q-type {
  display: inline-block;
  background: var(--card2); color: var(--accent2);
  padding: 4px 14px; border-radius: 20px;
  font-size: 0.82rem; margin-bottom: 16px;
}
.quiz-question h2 {
  font-size: 1.35rem; line-height: 1.8; font-weight: 600;
}
.quiz-options {
  max-width: 560px; width: 100%;
  display: flex; flex-direction: column; gap: 12px;
}
.quiz-option {
  padding: 15px 22px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  font-size: 1.02rem;
  display: flex; align-items: center; gap: 14px;
}
.quiz-option:hover { border-color: var(--accent); background: var(--card2); }
.quiz-option.selected { border-color: var(--accent2); background: var(--card2); }
.quiz-option.correct { border-color: var(--green); background: rgba(52,211,153,0.12); }
.quiz-option.wrong { border-color: var(--red); background: rgba(248,113,113,0.12); }
.quiz-option .opt-letter {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--bg3); color: var(--text2);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; flex-shrink: 0;
}
.quiz-option.correct .opt-letter { background: var(--green); color: #fff; }
.quiz-option.wrong .opt-letter { background: var(--red); color: #fff; }

.quiz-footer {
  padding: 20px 20px 30px; text-align: center;
  border-top: 1px solid var(--border);
}
.quiz-exp {
  max-width: 560px; margin: 0 auto 16px;
  padding: 14px 18px;
  background: var(--card); border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  font-size: 0.92rem; line-height: 1.7; color: var(--text2);
  display: none;
}
.quiz-exp.show { display: block; }
.quiz-exp .exp-label { color: var(--accent2); font-weight: 600; margin-bottom: 4px; }
.quiz-next { min-width: 200px; }

/* ===== 结果界面 ===== */
.result-screen {
  text-align: center; padding: 40px 20px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: 60vh;
}
.result-icon { font-size: 4rem; margin-bottom: 16px; }
.result-screen h2 { font-size: 1.8rem; margin-bottom: 8px; }
.result-screen .score { font-size: 3.5rem; font-weight: 800; color: var(--gold); margin: 16px 0; }
.result-screen .detail { color: var(--text2); font-size: 1.05rem; margin-bottom: 30px; }
.result-stats {
  display: flex; gap: 20px; margin-bottom: 30px; flex-wrap: wrap; justify-content: center;
}
.result-stat {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 24px; min-width: 100px;
}
.result-stat .val { font-size: 1.5rem; font-weight: 700; color: var(--accent2); }
.result-stat .lbl { font-size: 0.82rem; color: var(--text3); margin-top: 4px; }

/* ===== 登录页 ===== */
.auth-wrap {
  max-width: 420px; margin: 60px auto;
  padding: 0 20px;
  position: relative; z-index: 1;
}
.auth-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 36px 32px;
}
.auth-card h1 {
  font-size: 1.5rem; text-align: center; margin-bottom: 6px;
  color: var(--accent2);
}
.auth-card .sub {
  text-align: center; color: var(--text2); font-size: 0.9rem;
  margin-bottom: 28px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-size: 0.88rem; color: var(--text2);
  margin-bottom: 6px;
}
.form-group input {
  width: 100%; padding: 12px 16px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text);
  font-size: 1rem; outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus { border-color: var(--accent); }
.auth-tabs {
  display: flex; margin-bottom: 24px; border-radius: 10px;
  overflow: hidden; border: 1px solid var(--border);
}
.auth-tab {
  flex: 1; padding: 10px; text-align: center;
  cursor: pointer; font-weight: 600; color: var(--text2);
  background: var(--bg2); transition: all 0.2s;
}
.auth-tab.active { background: var(--accent); color: #fff; }
.auth-msg {
  padding: 10px 14px; border-radius: 8px; margin-bottom: 16px;
  font-size: 0.88rem; display: none;
}
.auth-msg.error { background: rgba(248,113,113,0.15); color: var(--red); display: block; }
.auth-msg.success { background: rgba(52,211,153,0.15); color: var(--green); display: block; }
.auth-links {
  text-align: center; margin-top: 18px;
}
.auth-links a {
  color: var(--accent2); text-decoration: none; font-size: 0.88rem;
}
.auth-links a:hover { text-decoration: underline; }
.guest-btn {
  width: 100%; margin-top: 12px; padding: 11px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 10px; color: var(--text2);
  font-size: 0.95rem; cursor: pointer;
  transition: all 0.2s;
}
.guest-btn:hover { border-color: var(--accent); color: var(--accent2); }

/* ===== 隐私政策 ===== */
.policy-wrap {
  max-width: 720px; margin: 40px auto;
  padding: 0 20px 60px;
  position: relative; z-index: 1;
}
.policy-wrap h1 {
  font-size: 1.8rem; color: var(--accent2); margin-bottom: 8px;
}
.policy-wrap .date {
  color: var(--text3); font-size: 0.88rem; margin-bottom: 32px;
}
.policy-wrap h2 {
  font-size: 1.25rem; color: var(--gold); margin: 32px 0 12px;
}
.policy-wrap p, .policy-wrap li {
  color: var(--text2); line-height: 1.9; font-size: 0.95rem;
  margin-bottom: 10px;
}
.policy-wrap ul { padding-left: 20px; }

/* ===== 底部 ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 30px 20px;
  text-align: center;
  position: relative; z-index: 1;
}
.footer-links {
  display: flex; gap: 20px; justify-content: center;
  flex-wrap: wrap; margin-bottom: 14px;
}
.footer-links a {
  color: var(--text2); text-decoration: none; font-size: 0.88rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent2); }
.footer .icp {
  color: var(--text3); font-size: 0.82rem; margin-top: 8px;
}
.footer .school {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--blue); text-decoration: none; font-size: 0.88rem;
  padding: 6px 14px; border: 1px solid var(--border); border-radius: 20px;
  transition: all 0.2s;
}
.footer .school:hover {
  border-color: var(--blue); background: rgba(96,165,250,0.1);
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .topbar-stats { gap: 8px; }
  .stat-pill { padding: 3px 8px; font-size: 0.78rem; }
  .subject-header { padding: 14px 16px; }
  .chapter-item { padding: 12px 16px 12px 68px; }
  .quiz-question h2 { font-size: 1.15rem; }
}

/* ===== Tabler SVG 图标（MIT 开源，CSS mask 染主题色）===== */
.ic {
  display: inline-block;
  width: 1.15em; height: 1.15em;
  background: currentColor;
  vertical-align: -0.18em;
  -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat;
  -webkit-mask-position: center; mask-position: center;
  -webkit-mask-size: contain; mask-size: contain;
  flex-shrink: 0;
}
.stat-pill .ic { width: 1.05em; height: 1.05em; }
.btn .ic { width: 1.2em; height: 1.2em; vertical-align: -0.2em; margin-right: 4px; }
.subject-icon .ic, .chapter-icon .ic { width: 1.4em; height: 1.4em; }
.footer .school .ic { width: 1.1em; height: 1.1em; margin-right: 4px; }
.login-pill .ic { width: 1.05em; height: 1.05em; }
.ic-flame { -webkit-mask-image: url(../svg/flame.svg); mask-image: url(../svg/flame.svg); }
.ic-star { -webkit-mask-image: url(../svg/star.svg); mask-image: url(../svg/star.svg); }
.ic-heart { -webkit-mask-image: url(../svg/heart.svg); mask-image: url(../svg/heart.svg); }
.ic-award { -webkit-mask-image: url(../svg/award.svg); mask-image: url(../svg/award.svg); }
.ic-user { -webkit-mask-image: url(../svg/user.svg); mask-image: url(../svg/user.svg); }
.ic-dice-5 { -webkit-mask-image: url(../svg/dice-5.svg); mask-image: url(../svg/dice-5.svg); }
.ic-calendar-event { -webkit-mask-image: url(../svg/calendar-event.svg); mask-image: url(../svg/calendar-event.svg); }
.ic-book { -webkit-mask-image: url(../svg/book.svg); mask-image: url(../svg/book.svg); }
.ic-school { -webkit-mask-image: url(../svg/school.svg); mask-image: url(../svg/school.svg); }
.ic-atom-2 { -webkit-mask-image: url(../svg/atom-2.svg); mask-image: url(../svg/atom-2.svg); }
.ic-clipboard-list { -webkit-mask-image: url(../svg/clipboard-list.svg); mask-image: url(../svg/clipboard-list.svg); }
.ic-target { -webkit-mask-image: url(../svg/target.svg); mask-image: url(../svg/target.svg); }
.ic-bolt { -webkit-mask-image: url(../svg/bolt.svg); mask-image: url(../svg/bolt.svg); }
.ic-heartbeat { -webkit-mask-image: url(../svg/heartbeat.svg); mask-image: url(../svg/heartbeat.svg); }
.ic-flask { -webkit-mask-image: url(../svg/flask.svg); mask-image: url(../svg/flask.svg); }
.ic-microscope { -webkit-mask-image: url(../svg/microscope.svg); mask-image: url(../svg/microscope.svg); }
.ic-pill { -webkit-mask-image: url(../svg/pill.svg); mask-image: url(../svg/pill.svg); }
.ic-virus { -webkit-mask-image: url(../svg/virus.svg); mask-image: url(../svg/virus.svg); }
.ic-building-factory-2 { -webkit-mask-image: url(../svg/building-factory-2.svg); mask-image: url(../svg/building-factory-2.svg); }
.ic-chart-line { -webkit-mask-image: url(../svg/chart-line.svg); mask-image: url(../svg/chart-line.svg); }
.ic-stethoscope { -webkit-mask-image: url(../svg/stethoscope.svg); mask-image: url(../svg/stethoscope.svg); }
.ic-file-text { -webkit-mask-image: url(../svg/file-text.svg); mask-image: url(../svg/file-text.svg); }
.ic-vaccine { -webkit-mask-image: url(../svg/vaccine.svg); mask-image: url(../svg/vaccine.svg); }
.ic-test-pipe { -webkit-mask-image: url(../svg/test-pipe.svg); mask-image: url(../svg/test-pipe.svg); }
.ic-prescription { -webkit-mask-image: url(../svg/prescription.svg); mask-image: url(../svg/prescription.svg); }
.ic-flask-2 { -webkit-mask-image: url(../svg/flask-2.svg); mask-image: url(../svg/flask-2.svg); }
.ic-zoom-scan { -webkit-mask-image: url(../svg/zoom-scan.svg); mask-image: url(../svg/zoom-scan.svg); }
.ic-first-aid-kit { -webkit-mask-image: url(../svg/first-aid-kit.svg); mask-image: url(../svg/first-aid-kit.svg); }

/* ===== 3D 分子实验室按钮（醒目）===== */
.btn-3d {
  background: linear-gradient(135deg, #7c6ff0, #a78bfa, #60a5fa);
  background-size: 200% 200%;
  animation: glow-shift 3s ease infinite;
  color: #fff; font-weight: 700; font-size: 1.05rem;
  padding: 14px 32px;
  border: 1px solid rgba(167,139,250,0.4);
  box-shadow: 0 4px 24px rgba(124,111,240,0.45), 0 0 0 1px rgba(167,139,250,0.2);
  text-decoration: none; display: inline-flex; align-items: center;
  position: relative; overflow: hidden;
}
.btn-3d::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
  transform: translateX(-100%); animation: shine 3s ease infinite;
}
.btn-3d:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(124,111,240,0.65), 0 0 0 2px rgba(167,139,250,0.35);
}
@keyframes glow-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
@keyframes shine {
  0% { transform: translateX(-100%); }
  60%, 100% { transform: translateX(100%); }
}

/* ===== Hero 格言 ===== */
.hero-motto {
  font-family: "Georgia","Times New Roman",serif;
  font-size: 1.55rem !important;
  font-style: italic;
  color: var(--gold) !important;
  letter-spacing: 2px;
  margin-bottom: 6px !important;
  text-shadow: 0 0 30px rgba(240,192,64,0.25);
}
.hero-sub {
  color: var(--text2); font-size: 0.98rem; max-width: 520px;
  margin: 0 auto 28px; line-height: 1.8;
}
/* ===== Footer 双校链接 ===== */
.footer-schools {
  display: flex; gap: 12px; justify-content: center;
  flex-wrap: wrap; margin-top: 10px;
}
.school-pharmacopoeia {
  border-color: rgba(240,192,64,0.3) !important;
}
.school-pharmacopoeia:hover {
  border-color: var(--gold) !important;
  background: rgba(240,192,64,0.08) !important;
}