* { box-sizing: border-box; }

html { background: var(--paper); }

body {
  min-height: 100vh;
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.8;
}

a { color: var(--jade); text-underline-offset: .2em; }
a:hover { color: var(--blue); }

.page-width { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

.site-header { width: min(1160px, calc(100% - 48px)); min-height: 84px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--blue); font-size: 24px; font-weight: 700; letter-spacing: .1em; text-decoration: none; }
.brand:hover { color: var(--jade); }
.brand-mark { display: grid; width: 31px; height: 31px; place-items: center; border: 1px solid var(--gold); border-radius: 50%; color: var(--gold); font-family: Georgia, serif; font-size: 20px; line-height: 1; }
.site-primary-nav { display: flex; align-items: center; gap: 1.45rem; }
.site-nav-link { color: #455164; font-family: system-ui, sans-serif; font-size: 14px; font-weight: 600; text-decoration: none; }
.site-nav-link:hover { color: var(--jade); }

.page-content { padding: 48px 0 96px; }
h1, h2, h3 { color: var(--blue); font-weight: 600; letter-spacing: .04em; }
h1 { margin: 0; font-size: clamp(36px, 5vw, 52px); line-height: 1.22; }
h2 { margin: 0; font-size: 23px; line-height: 1.4; }
h3 { margin: 1.8rem 0 .65rem; font-size: 18px; }
p { margin: .6rem 0; }

.eyebrow { margin: 0 0 .85rem; color: var(--jade); font-family: system-ui, sans-serif; font-size: 12px; font-weight: 700; letter-spacing: .2em; line-height: 1.3; }
.lead { max-width: 32rem; margin: 1.35rem 0 0; color: #536174; font-size: 17px; line-height: 1.95; }
.muted { color: var(--muted); }
.disclaimer { max-width: 32rem; margin-top: 1.2rem; color: #697486; font-size: 13px; line-height: 1.8; }
.back-link { margin: 0 0 1.3rem; font-size: 14px; }
.record-saved-note { margin: 0 0 1.3rem; padding: .7rem 1rem; border-left: 3px solid var(--jade); color: var(--jade); background: var(--ivory); }
.ai-prompt-panel { display: flex; align-items: center; justify-content: space-between; gap: 1rem 2rem; }
.ai-prompt-panel h2 { margin: 0; }
.ai-prompt-panel p { margin-bottom: 0; }
.ai-prompt-status { min-width: 13rem; color: var(--jade); font-size: 13px; }

.panel { margin: 1.5rem 0; padding: clamp(31px, 4vw, 48px); border: 1px solid var(--line); background: var(--ivory); }
.compact { padding-block: 31px; }
.casting-panel { width: min(850px, 100%); margin-top: 44px; margin-inline: auto; background: radial-gradient(circle at top, var(--casting-panel-start), var(--casting-panel-end)); }
.section-heading { display: grid; gap: .55rem; margin-bottom: 1.8rem; }
.section-heading .muted { margin: 0; }
.scope-card { width: min(850px, 100%); margin-inline: auto; color: var(--muted); }
.scope-card p:last-child { margin-bottom: 0; }

.error { margin: 1.2rem 0; padding: .9rem 1rem; border: 1px solid var(--danger); color: var(--danger); background: var(--danger-soft); }
.casting-form { display: grid; gap: 1.35rem; }
.casting-form label { display: grid; gap: .45rem; color: var(--ink); font-weight: 600; }
.casting-form [hidden] { display: none !important; }
.random-pacing { width: 100%; margin: 0; padding: 1rem 1.05rem 1.1rem; border: 1px solid var(--line); }
.random-pacing legend { padding-inline: .3rem; color: var(--ink); font-weight: 600; }
.random-pacing-options { display: flex; flex-wrap: wrap; gap: .7rem 1.7rem; }
.random-pacing .choice { display: inline-flex; align-items: center; gap: .45rem; color: var(--reading); font-weight: 400; }
.random-pacing input[type="radio"] { flex: 0 0 auto; min-height: 1.1rem; width: 1.1rem; height: 1.1rem; margin: 0; accent-color: var(--jade); }

input, select, textarea, button { min-height: 44px; border-radius: 0; font: inherit; }
input, select, textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--input-line); color: var(--ink); background: var(--input); }
textarea { min-height: 94px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--jade); outline-offset: 2px; }
button, .button { width: fit-content; padding: 10px 21px; border: 1px solid var(--blue); border-radius: 2px; color: var(--ivory); background: var(--blue); font-size: 14px; font-weight: 700; cursor: pointer; transition: transform 180ms ease, background 180ms ease; }
button:hover, .button:hover { color: var(--ivory); background: var(--blue-soft); transform: translateY(-1px); }
button:focus-visible { outline: 2px solid var(--jade); outline-offset: 3px; }
.button-quiet { border-color: var(--blue); color: var(--blue); background: transparent; }
.button-danger { border-color: var(--danger); color: var(--danger); background: transparent; }
.button-danger:hover { color: var(--ivory); background: var(--danger); }

.interactive-panel { max-width: 1000px; margin-inline: auto; }
.casting-topic { padding: .8rem 1rem; border-left: 3px solid var(--jade); color: var(--reading); background: var(--success-soft); }
.progress-status { margin-top: 0; color: var(--blue); font-weight: 700; }
.step-result { margin: 1.25rem 0; padding: 1rem 1.15rem; border-left: 3px solid var(--gold); color: var(--reading); background: var(--casting-gold); }
.interactive-hexagram-stage { display: grid; grid-template-columns: minmax(18rem, 25rem) 1fr; gap: 2rem 3rem; align-items: start; margin: 2rem 0; }
.interactive-hexagram-stage h2 { margin-bottom: 1rem; font-size: 23px; }
.interactive-hexagram-note { padding-top: 2.7rem; }

.hexagram-diagram { display: grid; width: fit-content; gap: .55rem; }
.hexagram-line-row { display: grid; grid-template-columns: 2.5rem minmax(8rem, 12rem) 3rem; align-items: center; gap: .7rem; min-height: 1.35rem; color: var(--blue); }
.hexagram-diagram.without-movement .hexagram-line-row { grid-template-columns: 2.5rem minmax(8rem, 12rem); }
.hexagram-line-label, .hexagram-line-status { color: var(--muted); font-size: .9rem; }
.hexagram-line-row.moving, .hexagram-line-row.moving .hexagram-line-status { color: var(--gold); font-weight: 700; }
.hexagram-line { display: block; height: .62rem; color: currentColor; }
.hexagram-line.yang { background: currentColor; }
.hexagram-line.yin { background: linear-gradient(to right, currentColor 0 42%, transparent 42% 58%, currentColor 58% 100%); }
.hexagram-line.pending { height: .62rem; border: 1px dashed var(--input-line); color: var(--input-line); opacity: .75; }

.primary-hexagram-pair { border-top: 2px solid var(--gold); }
.primary-hexagram-figures { position: relative; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem 4rem; }
.primary-hexagram-figures::after { position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; content: ""; background: var(--line); }
.primary-hexagram-figures article { display: grid; justify-self: center; width: fit-content; }
.primary-hexagram-name-stack { width: 100%; margin-top: 1.8rem; text-align: center; }
.primary-hexagram-label { margin: 0; color: var(--jade); font-family: system-ui, sans-serif; font-size: 12px; font-weight: 700; letter-spacing: .2em; }
.primary-hexagram-name { margin: .35rem 0 0; color: var(--blue); font-size: clamp(2rem, 5vw, 4rem); font-weight: 600; letter-spacing: .08em; line-height: 1.15; }
.primary-hexagram-pinyin { margin: .4rem 0 0; color: var(--muted); font-family: system-ui, sans-serif; font-size: 1rem; letter-spacing: .08em; }

.facts-grid { display: grid; grid-template-columns: minmax(8rem, 12rem) 1fr; gap: .85rem 1.35rem; }
.facts-grid dt { color: var(--blue); font-weight: 600; }
.facts-grid dd { margin: 0; color: var(--reading); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; color: var(--reading); }
th, td { padding: .75rem; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { color: var(--blue); background: rgb(182 144 85 / 12%); font-weight: 600; }
details { margin-block: .8rem; padding: .8rem 1rem; border: 1px solid var(--line); color: var(--reading); }
summary { color: var(--blue); font-weight: 600; cursor: pointer; }
.classical-text { color: var(--reading); line-height: 2; letter-spacing: .08em; }
.zhouyi-yizhu-inline-translation { margin: .35rem 0 1rem; padding: .45rem .75rem; border-left: 2px solid var(--gold); color: var(--reading); background: var(--warning-soft); line-height: 1.9; letter-spacing: .04em; }
.zhouyi-yizhu-inline-translation > strong { color: var(--jade); }
.hexagram-ruby { display: inline-flex; gap: .1em; color: var(--blue); font-size: 1.15rem; line-height: 1.8; }
.hexagram-ruby ruby { ruby-position: over; }
.hexagram-ruby rt { color: var(--muted); font-family: system-ui, sans-serif; font-size: .58em; letter-spacing: 0; }

@media (max-width: 720px) {
  .page-width { width: min(100% - 32px, 1160px); }
  .site-header { width: min(100% - 32px, 1160px); min-height: 70px; flex-wrap: wrap; padding-top: .8rem; }
  .brand { font-size: 20px; }
  .site-primary-nav { display: flex; flex-basis: 100%; order: 3; gap: 1rem; padding-bottom: .8rem; }
  .page-content { padding: 28px 0 64px; }
  .casting-panel h1 { font-size: 45px; }
  .panel { padding: 23px; }
  .interactive-hexagram-stage, .primary-hexagram-figures { grid-template-columns: 1fr; }
  .interactive-hexagram-note { padding-top: 0; }
  .primary-hexagram-figures::after { display: none; }
  .primary-hexagram-figures article + article { padding-top: 1.5rem; border-top: 1px solid var(--line); }
  .facts-grid { grid-template-columns: 1fr; gap: .25rem; }
  .facts-grid dd { margin-bottom: .75rem; }
  .ai-prompt-panel { align-items: flex-start; flex-direction: column; }
  .ai-prompt-status { min-width: 0; }
}