/* ==========================================================================
   纳迪研习 · 百题测验 —— 样式表（单一自动响应式布局）
   调色：暖纸 #f7f3e9 / 深青 #163f47 / 靛墨 #1f2536 / 藏红花 #d2822c / 赤铜 #a3581f
   几何：细线 yantra（圆 + 内接方 + 明点）、稀疏黄道符号、`नाडी ज्योतिष` 字标，均为纯装饰。
   字体：仅本地系统字体。梵文天城体为装饰性识别元素，缺字时不影响阅读与操作。
   ========================================================================== */

:root {
  --paper: #f7f3e9;
  --paper-deep: #eee8d8;
  --paper-card: #fbf8f1;

  /* 靛墨：正文与次级文字（对暖纸对比度 ≥ 4.7:1） */
  --ink: #1f2536;
  --ink-soft: #464e63;
  --ink-mute: #656c7f;

  /* 深青 / 靛蓝：标题、主按钮、选中态 */
  --teal: #163f47;
  --teal-soft: #245b62;
  --indigo: #2a3352;
  --teal-tint: rgba(22, 63, 71, 0.08);
  --teal-line: rgba(22, 63, 71, 0.18);

  /* 藏红花 / 赤铜：点缀线、字标、小标签。文字一律用 copper（≥ 4.8:1），saffron 只做线与符号 */
  --saffron: #d2822c;
  --copper: #a3581f;
  --copper-deep: #7d4116;
  --saffron-tint: rgba(210, 130, 44, 0.13);
  --saffron-line: rgba(210, 130, 44, 0.42);
  --gold: #d9b56b;

  --correct: #2f6b4f;
  --correct-tint: rgba(47, 107, 79, 0.12);
  --wrong: #9a3b30;
  --wrong-tint: rgba(154, 59, 48, 0.1);

  /* 旧令牌别名：下方规则沿用 --green / --brass 命名，整表随新调色一起切换 */
  --green: var(--teal);
  --green-soft: var(--teal-soft);
  --green-tint: var(--teal-tint);
  --green-line: var(--teal-line);
  --brass: var(--copper);
  --brass-deep: var(--copper-deep);
  --brass-tint: var(--saffron-tint);
  --brass-line: var(--saffron-line);

  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --deva: "Kohinoor Devanagari", "Devanagari Sangam MN", "Devanagari MT", "ITF Devanagari", "Nirmala UI", "Mangal", "Noto Sans Devanagari", "Noto Serif Devanagari", serif;
  --symbol: "Apple Symbols", "Segoe UI Symbol", "Noto Sans Symbols", "Noto Sans Symbols2", "DejaVu Sans", sans-serif;

  --radius-sm: 4px;
  --radius: 8px;
  --shadow-soft: 0 1px 0 rgba(23, 60, 54, 0.06), 0 12px 32px -18px rgba(23, 60, 54, 0.28);
  --focus-ring: 0 0 0 3px var(--paper), 0 0 0 5px var(--brass);
  --tap: 44px;
  --measure: 68ch;
  --gutter: clamp(16px, 4vw, 40px);
  --chart-side: 272px;
  --chart-stack: 336px;
}

/* ---------- 基础 ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 12% 0%, rgba(167, 121, 61, 0.09), transparent 55%),
    radial-gradient(ellipse at 100% 100%, rgba(23, 60, 54, 0.07), transparent 50%),
    repeating-linear-gradient(0deg, rgba(23, 60, 54, 0.012) 0 1px, transparent 1px 3px);
  background-attachment: fixed;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
}

[hidden] {
  display: none !important;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.02em;
  line-height: 1.3;
  margin: 0;
}

p {
  margin: 0;
}

a {
  color: var(--green);
  text-decoration-color: var(--brass-line);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: var(--brass);
}

img {
  max-width: 100%;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

::selection {
  background: rgba(167, 121, 61, 0.28);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -100px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--green);
  color: var(--paper);
  border-radius: var(--radius);
  font-weight: 600;
}

.skip-link:focus {
  top: 12px;
}

.sr-only,
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 滚动定位统一让出粘性页眉高度（quiz.js 实测后写入变量） */
#main,
main [id],
.q-stem,
.feedback,
.review-card,
.about h1,
.about h2,
.about h3 {
  scroll-margin-top: var(--reader-scroll-offset, 88px);
}

/* ---------- 梵文字标与黄道符号（纯装饰） ---------- */

[lang="sa"] {
  font-family: var(--deva);
  font-weight: 400;
  letter-spacing: 0;
  font-feature-settings: normal;
}

.zodiac-band {
  font-family: var(--symbol);
  font-size: 0.86rem;
  letter-spacing: 0.55em;
  line-height: 1;
  color: var(--brass);
  opacity: 0.72;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  user-select: none;
}

.yantra {
  position: absolute;
  width: 76px;
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--saffron) 45%, transparent);
  border-radius: 50%;
  opacity: 0.32;
  pointer-events: none;
  user-select: none;
}

.yantra::before,
.yantra::after {
  content: "";
  position: absolute;
  inset: 17%;
  border: 1px solid color-mix(in srgb, var(--teal) 38%, transparent);
  transform: rotate(45deg);
}

.yantra::after {
  inset: 37%;
  border-radius: 50%;
  background: var(--saffron);
  transform: none;
}

.yantra--landing {
  top: 24px;
  right: 24px;
}

.question {
  position: relative;
}

.yantra--question {
  width: 46px;
  top: 18px;
  right: 18px;
  display: grid;
  place-items: center;
  color: var(--copper);
  font-family: var(--symbol);
  font-size: 0.85rem;
}

.yantra--question::before,
.yantra--question::after {
  display: none;
}

.yantra--results {
  top: 22px;
  left: 22px;
}

.results__deva {
  color: var(--copper);
  font-size: 0.95rem;
  opacity: 0.78;
  margin-top: 18px;
}

/* ---------- 页眉 / 页脚 ---------- */

.site-header {
  border-bottom: 1px solid var(--green-line);
  background: rgba(247, 243, 233, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  min-height: 56px;
}

.site-brand {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  background: none;
  padding: 0 4px 0 0;
  min-height: var(--tap);
  cursor: pointer;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35em;
  font-family: var(--serif);
  color: var(--green);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  text-align: left;
  white-space: nowrap;
  border-radius: var(--radius);
}

.site-brand__deva {
  color: var(--brass);
  font-size: 1.05em;
  line-height: 1;
  margin-right: 0.2em;
  transform: translateY(0.02em);
}

.site-brand__sep {
  color: var(--brass);
}

.site-brand__sub {
  color: var(--ink-soft);
  font-size: 0.92em;
}

.site-header__note {
  font-family: var(--serif);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--brass);
  text-transform: uppercase;
  white-space: nowrap;
}

.site-main {
  flex: 1;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(18px, 3.5vw, 40px) var(--gutter) 56px;
}

.site-footer {
  border-top: 1px solid var(--green-line);
  padding: 18px var(--gutter) calc(20px + env(safe-area-inset-bottom, 0));
  text-align: center;
  color: var(--ink-mute);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  display: grid;
  gap: 4px;
}

.site-footer__deva {
  color: var(--brass);
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: 2px;
}

/* ---------- 通用组件 ---------- */

.btn {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  min-width: var(--tap);
  padding: 10px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  cursor: pointer;
  color: var(--green);
  background: transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.12s ease, box-shadow 0.18s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  background: var(--green);
  color: var(--paper);
  border-color: var(--green);
  box-shadow: 0 8px 20px -12px rgba(23, 60, 54, 0.7);
}

.btn--primary:hover:not(:disabled) {
  background: var(--green-soft);
  border-color: var(--green-soft);
}

.btn--secondary {
  border-color: var(--green-line);
  background: var(--paper-card);
}

.btn--secondary:hover:not(:disabled) {
  border-color: var(--green);
  background: var(--green-tint);
}

.btn--ghost {
  color: var(--brass-deep);
  border-color: transparent;
  text-decoration: underline;
  text-decoration-color: var(--brass-line);
  text-underline-offset: 0.25em;
  padding-inline: 12px;
}

.btn--ghost:hover:not(:disabled) {
  background: var(--brass-tint);
  text-decoration-color: var(--brass);
}

.btn--lg {
  font-size: 1.08rem;
  padding: 14px 32px;
  min-height: 52px;
}

.btn__icon {
  font-size: 1.05em;
  line-height: 1;
}

.status-line {
  min-height: 1.5em;
  margin-top: 12px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.status-line:empty {
  margin-top: 0;
}

.section-title {
  font-size: 1.25rem;
  position: relative;
  padding-left: 16px;
  margin-bottom: 16px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 4px;
  height: 0.9em;
  background: var(--brass);
  border-radius: 2px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--brass-line);
  background: var(--brass-tint);
  color: var(--brass-deep);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  white-space: nowrap;
}

/* 页边注 */
.marginalia {
  position: relative;
  font-family: var(--serif);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ink-soft);
  padding-left: 1.6em;
  border-left: 1px solid var(--brass-line);
  margin-left: 2px;
}

.marginalia__mark {
  position: absolute;
  left: 0.45em;
  top: 0;
  color: var(--brass);
  font-size: 0.9em;
}

/* ---------- 落地页 ---------- */

.landing__frame {
  position: relative;
  padding: clamp(26px, 4.5vw, 52px) clamp(18px, 4vw, 48px);
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.landing__frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--brass-line);
  pointer-events: none;
}

.frame-corner {
  position: absolute;
  width: 26px;
  height: 26px;
  border-color: var(--brass);
  border-style: solid;
  border-width: 0;
  pointer-events: none;
}

.frame-corner--tl { top: 10px; left: 10px; border-top-width: 2px; border-left-width: 2px; }
.frame-corner--tr { top: 10px; right: 10px; border-top-width: 2px; border-right-width: 2px; }
.frame-corner--bl { bottom: 10px; left: 10px; border-bottom-width: 2px; border-left-width: 2px; }
.frame-corner--br { bottom: 10px; right: 10px; border-bottom-width: 2px; border-right-width: 2px; }

.landing__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  position: relative;
  z-index: 1;
}

.landing__hero,
.landing__aside {
  min-width: 0;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 18px;
}

.eyebrow__rule {
  width: 34px;
  height: 1px;
  background: var(--brass);
  flex: none;
}

.landing__title {
  font-size: clamp(2.1rem, 6.5vw, 3.9rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.06em;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 0.3em;
}

.landing__title-dot {
  color: var(--brass);
}

.landing__title-sub {
  color: var(--green-soft);
  font-weight: 500;
}

.landing__deva {
  margin-top: 10px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--brass);
  line-height: 1.5;
  opacity: 0.9;
}

.landing__lede {
  margin-top: 18px;
  max-width: 34em;
  font-family: var(--serif);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.9;
  color: var(--ink-soft);
  text-align: justify;
}

.stat-trio {
  margin: 30px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--green-line);
  border-bottom: 1px solid var(--green-line);
}

.stat {
  padding: 16px 14px 14px 0;
  border-right: 1px solid var(--green-line);
  margin-right: 14px;
  min-width: 0;
}

.stat:last-child {
  border-right: 0;
  margin-right: 0;
}

.stat dt {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--brass);
  margin-bottom: 4px;
  white-space: nowrap;
}

.stat dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 6px;
  color: var(--green);
  font-family: var(--serif);
}

.stat__num {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat__unit {
  font-size: 0.86rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.mode-picker {
  margin: 28px 0 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.mode-picker__legend {
  padding: 0;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--brass);
  margin-bottom: 12px;
}

.mode-options {
  display: grid;
  gap: 12px;
  max-width: 40em;
}

.mode-option {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  background: var(--paper);
  cursor: pointer;
  transition: border-color 0.16s ease, background-color 0.16s ease, box-shadow 0.16s ease;
}

.mode-option:hover {
  border-color: var(--green);
  background: var(--paper-card);
}

.mode-option:focus-within {
  box-shadow: var(--focus-ring);
}

.mode-option input[type="radio"] {
  width: 20px;
  height: 20px;
  margin: 0.2em 0 0;
  accent-color: var(--green);
  cursor: pointer;
}

.mode-option:has(input:checked) {
  border-color: var(--green);
  background: var(--green-tint);
  box-shadow: inset 0 0 0 1px var(--green);
}

.mode-option__body {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.mode-option__title {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.06em;
}

.mode-option__desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.landing__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  align-items: center;
}

.landing__aside {
  display: grid;
  gap: 24px;
  align-content: start;
}

.rules {
  background: var(--paper);
  border: 1px solid var(--green-line);
  padding: 20px 20px 18px;
  position: relative;
}

.rules::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed var(--brass-line);
  pointer-events: none;
}

.rules__title {
  font-size: 1.05rem;
  letter-spacing: 0.18em;
  color: var(--brass-deep);
  margin-bottom: 12px;
}

.rules__list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rule;
  display: grid;
  gap: 12px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.rules__list li {
  position: relative;
  padding-left: 2.2em;
  counter-increment: rule;
}

.rules__list li::before {
  content: counter(rule, cjk-ideographic);
  position: absolute;
  left: 0;
  top: 0.05em;
  width: 1.6em;
  height: 1.6em;
  display: grid;
  place-items: center;
  border: 1px solid var(--brass-line);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 0.8em;
  color: var(--brass-deep);
}

.rules__list strong {
  color: var(--green);
  font-weight: 600;
}

.landing__quote {
  margin: 0;
  padding: 4px 0 0 18px;
  border-left: 3px double var(--brass-line);
  font-family: var(--serif);
  color: var(--green);
}

.landing__quote p {
  font-size: 1.1rem;
  letter-spacing: 0.06em;
}

.landing__quote footer {
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--ink-mute);
}

.landing__vertical {
  display: none;
}

@media (min-width: 880px) {
  .landing__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr);
    align-items: start;
  }

  .landing__aside {
    padding-top: 12px;
  }

  .landing__vertical {
    display: block;
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    color: var(--brass-line);
    pointer-events: none;
    user-select: none;
  }

  .landing__frame {
    padding-right: clamp(56px, 6vw, 80px);
  }
}

/* ---------- 作答页 ---------- */

.quiz__header {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--green-line);
}

.quiz__header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
}

.quiz__heading {
  font-size: 0.85rem;
  letter-spacing: 0.24em;
  color: var(--brass);
  font-weight: 500;
}

.mode-label {
  font-family: var(--serif);
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--brass-deep);
}

.quiz__progress {
  display: grid;
  gap: 8px;
}

.quiz__progress-label {
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.quiz__progress-bar {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border: 0;
  border-radius: 3px;
  background: var(--paper-deep);
  overflow: hidden;
  color: var(--brass);
}

.quiz__progress-bar::-webkit-progress-bar {
  background: var(--paper-deep);
  border-radius: 3px;
}

.quiz__progress-bar::-webkit-progress-value {
  background: linear-gradient(90deg, var(--green), var(--brass));
  border-radius: 3px;
  transition: width 0.3s ease;
}

.quiz__progress-bar::-moz-progress-bar {
  background: linear-gradient(90deg, var(--green), var(--brass));
  border-radius: 3px;
}

.quiz__progress-note {
  font-size: 0.84rem;
  color: var(--ink-mute);
}

.quiz__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.question {
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  padding: clamp(18px, 3.5vw, 36px);
  box-shadow: var(--shadow-soft);
  min-width: 0;
}

.question__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  margin-bottom: 14px;
}

.q-position {
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--brass-deep);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.q-position__of {
  color: var(--ink-mute);
  font-size: 0.85em;
}

.q-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.q-stem {
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  line-height: 1.55;
  color: var(--green);
  max-width: var(--measure);
  margin-bottom: 20px;
  overflow-wrap: anywhere;
}

.q-stem:focus {
  outline: none;
}

/* ---------- 案例背景与星盘（按可用宽度并排或上下排列） ---------- */

.case-block {
  margin: 4px 0 24px;
  display: grid;
  gap: 14px;
  container-type: inline-size;
  container-name: case;
}

.case-block__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.case-context {
  position: relative;
  min-width: 0;
  padding: 14px 16px 14px 18px;
  background: var(--paper);
  border: 1px solid var(--green-line);
  border-left: 3px solid var(--brass);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.case-context__title {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--brass-deep);
  margin-bottom: 6px;
}

.case-context__text {
  font-family: var(--serif);
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.case-chart {
  margin: 0;
  display: grid;
  gap: 8px;
  width: 100%;
  max-width: var(--chart-stack);
  min-width: 0;
}

.case-chart__frame {
  padding: 6px;
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
}

.case-chart__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
}

.case-chart__caption {
  font-family: var(--serif);
  font-size: 0.82rem;
  color: var(--ink-mute);
  line-height: 1.65;
}

.case-chart__fallback {
  padding: 12px 14px;
  border: 1px dashed var(--brass-line);
  border-radius: var(--radius);
  background: var(--brass-tint);
  color: var(--brass-deep);
  font-size: 0.9rem;
  line-height: 1.7;
}

@container case (min-width: 600px) {
  .case-block__grid {
    grid-template-columns: minmax(0, 1fr) var(--chart-side);
    gap: 18px;
  }

  .case-chart {
    max-width: none;
  }
}

/* ---------- 选项 ---------- */

.options {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  border: 0;
  max-width: var(--measure);
}

.options fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  min-width: 0;
}

.option {
  position: relative;
  display: grid;
  grid-template-columns: 20px 24px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  min-height: var(--tap);
  padding: 12px 16px;
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.6;
  cursor: pointer;
  transition: border-color 0.16s ease, background-color 0.16s ease, box-shadow 0.16s ease;
  overflow-wrap: anywhere;
}

.option:hover {
  border-color: var(--green);
  background: var(--paper-card);
}

.option:focus-within {
  box-shadow: var(--focus-ring);
}

.option input[type="radio"],
.option input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  margin: 0.2em 0 0;
  width: 20px;
  height: 20px;
  flex: none;
  border: 1.5px solid var(--green);
  background: var(--paper-card);
  display: grid;
  place-content: center;
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease;
}

.option input[type="radio"] {
  border-radius: 50%;
}

.option input[type="checkbox"] {
  border-radius: 4px;
}

.option input[type="radio"]::before,
.option input[type="checkbox"]::before {
  content: "";
  width: 10px;
  height: 10px;
  transform: scale(0);
  transition: transform 0.14s ease;
  background: var(--paper);
}

.option input[type="radio"]::before {
  border-radius: 50%;
}

.option input[type="checkbox"]::before {
  width: 11px;
  height: 6px;
  border-left: 2px solid var(--paper);
  border-bottom: 2px solid var(--paper);
  background: transparent;
  transform: translateY(-1px) rotate(-45deg) scale(0);
}

.option input:checked {
  background: var(--green);
  border-color: var(--green);
}

.option input[type="radio"]:checked::before {
  transform: scale(1);
}

.option input[type="checkbox"]:checked::before {
  transform: translateY(-1px) rotate(-45deg) scale(1);
}

.option input:focus-visible {
  box-shadow: none;
}

.option input:disabled {
  cursor: default;
}

.option-letter {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--brass-deep);
}

.option-text {
  min-width: 0;
  overflow-wrap: anywhere;
}

.option.selected {
  border-color: var(--green);
  background: var(--green-tint);
  box-shadow: inset 0 0 0 1px var(--green);
}

.option.correct {
  border-color: var(--correct);
  background: var(--correct-tint);
  box-shadow: inset 0 0 0 1px var(--correct);
}

.option.correct input {
  background: var(--correct);
  border-color: var(--correct);
}

.option.wrong {
  border-color: var(--wrong);
  background: var(--wrong-tint);
  box-shadow: inset 0 0 0 1px var(--wrong);
}

.option.wrong input {
  background: var(--wrong);
  border-color: var(--wrong);
}

/* 核对后为「正确 / 误选」角标单独留出一列 */
.option.correct,
.option.wrong {
  grid-template-columns: 20px 24px minmax(0, 1fr) auto;
}

.option.correct::after,
.option.wrong::after {
  grid-column: 4;
  align-self: center;
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-weight: 600;
  white-space: nowrap;
}

.option.correct::after {
  content: "正确";
  color: var(--correct);
}

.option.wrong::after {
  content: "误选";
  color: var(--wrong);
}

.question__hint {
  margin-top: 20px;
  max-width: var(--measure);
}

.question__toolbar {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--green-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.question__stepper {
  display: flex;
  gap: 10px;
  flex: 1 1 auto;
  justify-content: center;
}

.question__stepper .btn {
  flex: 1 1 0;
  max-width: 200px;
}

.btn--flag[aria-pressed="true"] {
  color: var(--brass-deep);
  background: var(--brass-tint);
  text-decoration: none;
  border-color: var(--brass-line);
}

.btn--flag[aria-pressed="true"] .btn__icon {
  color: var(--brass);
}

/* ---------- 练习即时反馈 ---------- */

.feedback {
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  background: var(--paper);
  display: grid;
  gap: 10px;
  max-width: var(--measure);
}

.feedback:focus {
  outline: none;
}

.feedback--correct {
  border-left: 4px solid var(--correct);
}

.feedback--wrong {
  border-left: 4px solid var(--wrong);
}

.feedback__verdict {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.feedback--correct .feedback__verdict { color: var(--correct); }
.feedback--wrong .feedback__verdict { color: var(--wrong); }

.feedback__answer {
  font-size: 0.95rem;
  color: var(--green);
  line-height: 1.75;
}

.feedback__explanation {
  font-family: var(--serif);
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 反馈 / 解析中的纯文本出处 */
.review-sources {
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--green-line);
  padding-top: 14px;
}

.review-sources__title {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--brass-deep);
  font-weight: 600;
}

.source-item {
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  background: var(--paper-card);
  padding: 4px 14px;
}

.source-item__summary {
  min-height: var(--tap);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--green);
  list-style: none;
}

.source-item__summary::-webkit-details-marker { display: none; }
.source-item__summary::marker { content: ""; }

.source-item__summary::after {
  content: " ▾";
  color: var(--brass);
  font-size: 0.85em;
}

.source-item[open] .source-item__summary::after { content: " ▴"; }

.source-title { font-weight: 600; }

.source-locator {
  font-size: 0.84rem;
  color: var(--ink-mute);
}

.source-quote {
  margin: 4px 0 12px;
  padding-left: 14px;
  border-left: 2px solid var(--brass-line);
  font-family: var(--serif);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

/* ---------- 侧栏导航 ---------- */

.nav-panel {
  min-width: 0;
}

.nav-drawer {
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  box-shadow: var(--shadow-soft);
}

.nav-drawer__summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--tap);
  padding: 10px 18px;
  cursor: pointer;
  font-family: var(--serif);
  color: var(--green);
  letter-spacing: 0.12em;
  user-select: none;
}

.nav-drawer__summary::-webkit-details-marker {
  display: none;
}

.nav-drawer__summary::marker {
  content: "";
}

.nav-drawer__hint {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--brass);
}

.nav-drawer__hint::after {
  content: " ▾";
}

.nav-drawer[open] .nav-drawer__hint::after {
  content: " ▴";
}

.nav-drawer__body {
  padding: 4px 18px 18px;
  border-top: 1px solid var(--green-line);
}

.nav-legend {
  list-style: none;
  margin: 12px 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.nav-legend li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid var(--green-line);
  background: var(--paper);
}

.nav-legend__swatch--answered {
  background: var(--green-tint);
  border-color: var(--green);
}

.nav-legend__swatch--checked {
  background: var(--brass-tint);
  border-color: var(--brass);
}

.nav-legend__swatch--flagged {
  background: linear-gradient(135deg, var(--paper) 55%, var(--brass) 56%);
  border-color: var(--brass);
}

.nav-legend__swatch--active {
  background: var(--green);
  border-color: var(--green);
}

.question-nav {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 6px;
}

.q-button {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  min-width: var(--tap);
  min-height: var(--tap);
  padding: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--green-line);
  background: var(--paper);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  overflow: hidden;
  transition: background-color 0.14s ease, border-color 0.14s ease, color 0.14s ease;
  -webkit-tap-highlight-color: transparent;
}

.q-button:hover {
  border-color: var(--green);
  color: var(--green);
}

.q-button.answered {
  background: var(--green-tint);
  border-color: var(--green-soft);
  color: var(--green);
  font-weight: 600;
}

.q-button.checked {
  background: var(--brass-tint);
  border-color: var(--brass-line);
  color: var(--brass-deep);
  font-weight: 600;
}

.q-button.checked-correct {
  background: var(--correct-tint);
  border-color: var(--correct);
  color: var(--correct);
}

.q-button.checked-wrong {
  background: var(--wrong-tint);
  border-color: var(--wrong);
  color: var(--wrong);
}

.q-button.flagged::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-style: solid;
  border-width: 0 12px 12px 0;
  border-color: transparent var(--brass) transparent transparent;
}

/* 当前题高亮始终优先于对错底色 */
.q-button.active {
  background: var(--green);
  border-color: var(--green);
  color: var(--paper);
  font-weight: 600;
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 3px var(--green);
}

.q-button.active.flagged::after {
  border-color: transparent var(--gold) transparent transparent;
}

.nav-drawer__note {
  margin-top: 14px;
  font-size: 0.8rem;
  color: var(--ink-mute);
  line-height: 1.6;
}

@media (min-width: 960px) {
  .quiz__layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
  }

  .nav-panel {
    position: sticky;
    top: var(--reader-scroll-offset, 88px);
  }

  .nav-drawer__summary {
    cursor: default;
    padding-top: 14px;
  }

  .nav-drawer__hint {
    display: none;
  }

  /* 宽屏始终展开导航：支持 ::details-content 的浏览器直接渲染内容，
     旧浏览器保留 summary 可点击作为后备。 */
  .nav-drawer::details-content {
    display: block;
    content-visibility: visible;
  }

  @supports selector(::details-content) {
    .nav-drawer__summary {
      pointer-events: none;
    }
  }

  .question-nav {
    max-height: min(52vh, 560px);
    overflow-y: auto;
    padding: 2px;
    scrollbar-width: thin;
    scrollbar-color: var(--brass-line) transparent;
  }
}

/* ---------- 结果页 ---------- */

.results {
  display: grid;
  gap: 36px;
}

.results__hero {
  position: relative;
  text-align: center;
  padding: clamp(32px, 5vw, 60px) clamp(18px, 4vw, 48px) clamp(28px, 4.5vw, 48px);
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.results__hero::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--brass-line);
  pointer-events: none;
}

.zodiac-band--hero {
  margin: 0 auto 22px;
  max-width: 100%;
  font-size: 0.8rem;
  letter-spacing: 0.7em;
  opacity: 0.6;
}

.results__heading {
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  color: var(--brass);
  font-weight: 500;
  margin-top: 24px;
}

.result-mode {
  margin-top: 16px;
  font-family: var(--serif);
  font-size: 1rem;
  letter-spacing: 0.2em;
  color: var(--brass-deep);
}

.results__score-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  margin-top: 6px;
  font-family: var(--serif);
  color: var(--green);
}

.score {
  font-size: clamp(3.6rem, 12vw, 6rem);
  line-height: 1;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.score__denominator {
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  color: var(--ink-mute);
  letter-spacing: 0.06em;
}

.tier {
  margin-top: 14px;
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  letter-spacing: 0.3em;
  color: var(--brass-deep);
}

.tier:empty {
  display: none;
}

.tier:focus {
  outline: none;
}

.result-message {
  margin: 16px auto 0;
  max-width: 36em;
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.result-detail {
  color: var(--ink-mute);
  font-size: 0.9rem;
  margin-top: 16px;
}

.stratified-note {
  padding: 22px;
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  display: grid;
  gap: 16px;
}

.stratified-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.stratified-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--brass-line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.stratified-list__num {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.results__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.results__actions + .status-line {
  text-align: center;
  margin-top: -20px;
}

.results__actions + .status-line:empty {
  margin-top: -36px;
}

#share-status textarea {
  border: 1px solid var(--green-line);
  border-radius: 4px;
  padding: 12px;
  color: var(--green);
  background: var(--paper-card);
  font: inherit;
  width: 100%;
  max-width: 100%;
}

#mistakes-only[aria-pressed="true"],
#review-toggle[aria-expanded="true"] {
  background: var(--brass-tint);
  text-decoration: none;
  border-color: var(--brass-line);
}

.results__disclaimer {
  text-align: center;
  font-family: var(--serif);
  font-size: 0.88rem;
  color: var(--ink-mute);
  letter-spacing: 0.06em;
  padding-top: 24px;
  border-top: 1px solid var(--green-line);
}

/* 分类统计 */
.category-stats {
  display: grid;
  gap: 10px;
}

.category-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name count"
    "bar  bar";
  gap: 6px 14px;
  align-items: center;
  padding: 14px 18px;
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
}

.category-row__name {
  grid-area: name;
  font-family: var(--serif);
  color: var(--green);
  font-weight: 600;
  letter-spacing: 0.04em;
  min-width: 0;
  overflow-wrap: anywhere;
}

.category-row__count {
  grid-area: count;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  font-size: 0.92rem;
  white-space: nowrap;
}

.category-row__bar {
  grid-area: bar;
  width: 100%;
  height: 6px;
  border: 0;
  border-radius: 3px;
  background: var(--paper-deep);
  overflow: hidden;
  appearance: none;
  -webkit-appearance: none;
  accent-color: var(--green);
}

.category-row__bar::-webkit-progress-bar {
  background: var(--paper-deep);
  border-radius: 3px;
}

.category-row__bar::-webkit-progress-value {
  background: linear-gradient(90deg, var(--green), var(--brass));
  border-radius: 3px;
}

.category-row__bar::-moz-progress-bar {
  background: var(--green);
}

@media (min-width: 640px) {
  .category-row {
    grid-template-columns: minmax(120px, 0.6fr) minmax(0, 1.6fr) auto;
    grid-template-areas: "name bar count";
  }
}

/* ---------- 逐题解析 ---------- */

.review-list {
  display: grid;
  gap: 16px;
}

.review-list:empty {
  display: none;
}

.review-card {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--green-line);
  border-left: 4px solid var(--green-line);
  padding: 20px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  display: grid;
  gap: 12px;
  min-width: 0;
  overflow-wrap: anywhere;
  container-type: inline-size;
  container-name: case;
}

.review-card.correct {
  border-left-color: var(--correct);
}

.review-card.wrong {
  border-left-color: var(--wrong);
}

.review-meta,
.editorial-note {
  font-size: 0.84rem;
  color: var(--ink-mute);
}

.review-stem {
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--green);
  font-weight: 600;
}

.review-case {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.review-case-context {
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-soft);
  padding: 12px 16px;
  background: var(--paper);
  border-left: 1px solid var(--brass-line);
  min-width: 0;
}

.review-chart {
  margin: 0;
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: 300px;
  min-width: 0;
}

.review-chart img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  padding: 6px;
  border: 1px solid var(--green-line);
  border-radius: var(--radius);
  background: var(--paper-card);
}

@container case (min-width: 600px) {
  .review-case {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 16px;
  }

  .review-chart {
    max-width: none;
  }
}

.review-options {
  display: grid;
  gap: 8px;
}

.review-option {
  margin: 0;
  padding: 10px 14px;
  border-radius: 4px;
  background: var(--paper);
  font-size: 0.95rem;
}

.review-option.correct {
  color: var(--correct);
  background: var(--correct-tint);
}

.review-option.wrong {
  color: var(--wrong);
  background: var(--wrong-tint);
}

.review-card .explanation {
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-soft);
  padding: 12px 16px;
  background: var(--paper);
  border-left: 1px solid var(--brass-line);
}

.empty-review {
  color: var(--ink-mute);
  font-size: 0.92rem;
}

/* ---------- 奖赏徽章（tier-1 … tier-5） ---------- */

.reward {
  --reward-size: clamp(112px, 24vw, 156px);
  --reward-color: var(--green-line);
  --reward-accent: var(--brass);
  position: relative;
  width: var(--reward-size);
  height: var(--reward-size);
  margin: 0 auto;
  display: grid;
  place-items: center;
}

.reward > span {
  position: absolute;
  inset: 0;
  margin: auto;
  pointer-events: none;
}

.reward__halo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--brass-tint), transparent 70%);
  opacity: 0;
}

.reward__ring {
  border-radius: 50%;
  border: 1px solid var(--reward-color);
}

.reward__ring--outer {
  width: 100%;
  height: 100%;
}

.reward__ring--inner {
  width: 74%;
  height: 74%;
  opacity: 0;
}

.reward__core {
  width: 46%;
  height: 46%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: calc(var(--reward-size) * 0.2);
  color: var(--reward-accent);
  background: var(--paper);
  border: 1px solid var(--reward-color);
}

.reward__core::before {
  content: "·";
  line-height: 1;
}

.reward__spark {
  width: 8px;
  height: 8px;
  opacity: 0;
  background: var(--reward-accent);
  clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
}

.reward__spark--1 { transform: translate(0, calc(var(--reward-size) * -0.5)); }
.reward__spark--2 { transform: translate(calc(var(--reward-size) * 0.5), 0); }
.reward__spark--3 { transform: translate(0, calc(var(--reward-size) * 0.5)); }
.reward__spark--4 { transform: translate(calc(var(--reward-size) * -0.5), 0); }

.reward__leaf {
  width: 22%;
  height: 40%;
  opacity: 0;
  border: 1.5px solid var(--reward-accent);
  border-radius: 100% 0;
  background: transparent;
}

.reward__leaf--l {
  transform: translate(calc(var(--reward-size) * -0.42), calc(var(--reward-size) * 0.16)) rotate(20deg);
}

.reward__leaf--r {
  transform: translate(calc(var(--reward-size) * 0.42), calc(var(--reward-size) * 0.16)) rotate(-20deg) scaleX(-1);
}

/* tier-1 · 初识：一环一点，安静浮现 */
.results.tier-1 .reward {
  --reward-color: var(--green-line);
  --reward-accent: var(--ink-mute);
}

.results.tier-1 .reward__ring--outer {
  animation: reward-fade 1.2s ease both;
}

/* tier-2 · 入门：双环、黄铜点缀 */
.results.tier-2 .reward {
  --reward-color: var(--brass-line);
  --reward-accent: var(--brass);
}

.results.tier-2 .reward__ring--inner {
  opacity: 1;
  border-style: dotted;
  animation: reward-fade 1.2s ease both;
}

.results.tier-2 .reward__core::before {
  content: "✧";
}

/* tier-3 · 研习：虚线环缓缓转动 */
.results.tier-3 .reward {
  --reward-color: var(--brass);
  --reward-accent: var(--green);
}

.results.tier-3 .reward__ring--inner {
  opacity: 1;
  border-style: dashed;
  animation: reward-spin 28s linear infinite;
}

.results.tier-3 .reward__ring--outer {
  animation: reward-fade 1.2s ease both;
}

.results.tier-3 .reward__core {
  background: var(--green-tint);
}

.results.tier-3 .reward__core::before {
  content: "✦";
}

/* tier-4 · 精进：四星呼吸，双叶护持 */
.results.tier-4 .reward {
  --reward-color: var(--brass);
  --reward-accent: var(--brass-deep);
}

.results.tier-4 .reward__ring--outer {
  border-width: 1.5px;
  animation: reward-fade 1.2s ease both;
}

.results.tier-4 .reward__ring--inner {
  opacity: 1;
  border-style: double;
  border-width: 3px;
}

.results.tier-4 .reward__spark {
  opacity: 1;
  animation: reward-breathe 3.2s ease-in-out infinite;
}

.results.tier-4 .reward__spark--2 { animation-delay: 0.8s; }
.results.tier-4 .reward__spark--3 { animation-delay: 1.6s; }
.results.tier-4 .reward__spark--4 { animation-delay: 2.4s; }

.results.tier-4 .reward__leaf {
  opacity: 1;
}

.results.tier-4 .reward__core {
  background: var(--brass-tint);
}

.results.tier-4 .reward__core::before {
  content: "❖";
}

/* tier-5 · 通达：流光金环、星辰环绕 */
.results.tier-5 .reward {
  --reward-color: var(--gold);
  --reward-accent: var(--brass-deep);
}

.results.tier-5 .reward__halo {
  opacity: 1;
  animation: reward-pulse 4s ease-in-out infinite;
}

.results.tier-5 .reward__ring--outer {
  border: 0;
  background: conic-gradient(from 0deg, var(--gold), var(--brass), var(--green), var(--brass), var(--gold));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2px));
  animation: reward-spin 12s linear infinite;
}

.results.tier-5 .reward__ring--inner {
  opacity: 1;
  border-style: double;
  border-width: 3px;
  border-color: var(--brass);
}

.results.tier-5 .reward__spark {
  opacity: 1;
  width: 10px;
  height: 10px;
  background: var(--gold);
  animation: reward-orbit 9s linear infinite;
}

.results.tier-5 .reward__spark--2 { animation-delay: -2.25s; }
.results.tier-5 .reward__spark--3 { animation-delay: -4.5s; }
.results.tier-5 .reward__spark--4 { animation-delay: -6.75s; }

.results.tier-5 .reward__leaf {
  opacity: 1;
  border-color: var(--gold);
  border-width: 2px;
}

.results.tier-5 .reward__core {
  background: linear-gradient(160deg, #f6ebd2, var(--paper) 60%);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px var(--gold), 0 10px 26px -10px rgba(167, 121, 61, 0.55);
  animation: reward-fade 1.4s ease both;
}

.results.tier-5 .reward__core::before {
  content: "✵";
}

.results.tier-5 .score {
  background: linear-gradient(120deg, var(--green) 0%, var(--brass-deep) 55%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@keyframes reward-fade {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes reward-spin {
  to { transform: rotate(360deg); }
}

@keyframes reward-breathe {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 1; }
}

@keyframes reward-pulse {
  0%, 100% { transform: scale(0.9); opacity: 0.6; }
  50%      { transform: scale(1.08); opacity: 1; }
}

@keyframes reward-orbit {
  from { transform: rotate(0deg) translateY(calc(var(--reward-size) * -0.5)) rotate(0deg); }
  to   { transform: rotate(360deg) translateY(calc(var(--reward-size) * -0.5)) rotate(-360deg); }
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom, 0));
  transform: translateX(-50%);
  z-index: 50;
  max-width: min(92vw, 420px);
  padding: 12px 20px;
  background: var(--green);
  color: var(--paper);
  border: 1px solid rgba(214, 178, 106, 0.5);
  border-radius: var(--radius);
  box-shadow: 0 14px 36px -14px rgba(23, 60, 54, 0.7);
  font-size: 0.95rem;
  line-height: 1.5;
  text-align: center;
  animation: toast-in 0.28s ease both;
}

.toast:empty {
  display: none;
}

@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- 说明页 ---------- */

.about {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(18px, 3.5vw, 40px) var(--gutter) 56px;
  width: 100%;
  flex: 1;
}

.about__return {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: var(--tap);
  color: var(--green);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: var(--radius);
}

.about__return:hover {
  text-decoration: underline;
  text-decoration-color: var(--brass);
}

.about h1 {
  margin-top: 10px;
  font-size: clamp(1.7rem, 4.5vw, 2.5rem);
  letter-spacing: 0.06em;
}

.about h2 {
  margin-top: 2.2em;
  font-size: 1.25rem;
  position: relative;
  padding-left: 16px;
}

.about h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 4px;
  height: 0.9em;
  background: var(--brass);
  border-radius: 2px;
}

.about p,
.about li {
  margin-top: 0.9em;
  color: var(--ink-soft);
  line-height: 1.85;
  max-width: var(--measure);
  overflow-wrap: anywhere;
}

.about strong {
  color: var(--green);
}

.about code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--green-tint);
  padding: 0.05em 0.4em;
  border-radius: 4px;
}

.about .table-wrap {
  overflow-x: auto;
  margin-top: 1em;
  -webkit-overflow-scrolling: touch;
}

.about table {
  width: 100%;
  border-collapse: collapse;
  min-width: 420px;
  background: var(--paper-card);
  border: 1px solid var(--green-line);
}

.about th,
.about td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--green-line);
  font-size: 0.95rem;
}

.about th {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--green);
  background: var(--green-tint);
  letter-spacing: 0.04em;
}

.about td:not(:first-child),
.about th:not(:first-child) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.about .file-list {
  list-style: none;
  padding: 0;
  margin: 1em 0 0;
  display: grid;
  gap: 6px;
}

.about .file-list li {
  margin: 0;
}

.about .file-list a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
}

/* ---------- 小屏细节（360–430px 为主要目标） ---------- */

@media (max-width: 640px) {
  .yantra--landing,
  .yantra--results {
    width: 58px;
    opacity: 0.22;
  }

  .yantra--question {
    width: 38px;
    top: 12px;
    right: 12px;
  }

  .site-header__inner {
    min-height: 52px;
  }

  .site-brand {
    font-size: 0.95rem;
    letter-spacing: 0.08em;
  }

  .site-header__note {
    display: none;
  }

  .stat-trio {
    grid-template-columns: minmax(0, 1fr);
  }

  .stat {
    border-right: 0;
    margin-right: 0;
    border-bottom: 1px solid var(--green-line);
    padding: 12px 0;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
  }

  .stat dt {
    margin-bottom: 0;
  }

  .stat:last-child {
    border-bottom: 0;
  }

  .landing__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .landing__actions .btn {
    width: 100%;
  }

  .zodiac-band {
    letter-spacing: 0.42em;
    font-size: 0.8rem;
  }

  .question__toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .question__stepper {
    width: 100%;
  }

  .question__stepper .btn {
    max-width: none;
  }

  .results__actions .btn {
    flex: 1 1 calc(50% - 6px);
  }

  .review-card {
    padding: 18px 14px;
  }
}

@media (max-width: 480px) {
  .option {
    gap: 8px;
    padding: 12px;
    grid-template-columns: 20px 20px minmax(0, 1fr);
  }

  .option.correct,
  .option.wrong {
    grid-template-columns: 20px 20px minmax(0, 1fr);
  }

  .option.correct::after,
  .option.wrong::after {
    grid-column: 3;
    justify-self: end;
    font-size: 0.72rem;
  }

  .case-chart {
    max-width: 100%;
  }
}

@media (max-width: 360px) {
  body {
    font-size: 15px;
  }

  .landing__title {
    letter-spacing: 0.03em;
  }

  .results__actions .btn {
    flex-basis: 100%;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- 打印 ---------- */

@media print {
  .site-header,
  .site-footer,
  .results__actions,
  .toast,
  .nav-panel,
  .question__toolbar,
  .skip-link {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .review-card,
  .case-block {
    break-inside: avoid;
  }
}