:root { --yi-ink: #173c31; --yi-red: #ab4937; --yi-gold: #bf8d3f; --yi-paper: #f7f1e4; --yi-line: #ded1ba; }
.yijing-tool-page *, .yijing-tool-page *::before, .yijing-tool-page *::after { box-sizing: border-box; }
.yijing-tool-page { background: #f8f5ed; }
.yi-main { overflow: hidden; color: #20352c; }

.yi-hero { position: relative; padding: 70px 0 74px; background: radial-gradient(circle at 78% 42%, rgba(191,141,63,.16), transparent 26%), linear-gradient(135deg, #fbfaf6 0 54%, #eee5d5 54% 100%); }
.yi-hero::before { content: "周易"; position: absolute; left: 3vw; bottom: -28px; color: rgba(23,60,49,.03); font: 700 170px/1 KaiTi, serif; letter-spacing: .2em; pointer-events: none; }
.yi-hero-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 70px; align-items: center; }
.yi-hero-copy { position: relative; z-index: 2; }
.yi-hero-copy h1 { margin: 0; color: var(--yi-ink); font: 700 clamp(50px, 6.2vw, 76px)/1.16 KaiTi, serif; letter-spacing: .03em; }
.yi-hero-copy > p:not(.tool-eyebrow) { max-width: 560px; margin: 22px 0 0; color: #66716a; font-size: 17px; line-height: 1.95; }
.yi-hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 22px; }
.yi-hero-actions a { padding: 10px 17px; border: 1px solid #d6c8b0; border-radius: 999px; color: var(--yi-ink); background: rgba(255,255,255,.66); font-size: 13px; font-weight: 700; text-decoration: none; }
.yi-hero-actions a:first-child { color: #fff; border-color: var(--yi-ink); background: var(--yi-ink); }
.yi-hero-copy aside { max-width: 590px; padding: 13px 16px; border-left: 3px solid var(--yi-gold); color: #7a715f; background: rgba(255,251,240,.82); font-size: 12px; line-height: 1.7; }

.yi-bagua-stage { display: grid; justify-items: center; }
.yi-bagua-ring { position: relative; width: min(490px, 44vw); aspect-ratio: 1; border: 1px solid rgba(23,60,49,.18); border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.92) 0 31%, rgba(255,255,255,.36) 31.5% 57%, transparent 57.5%), repeating-conic-gradient(from 22.5deg, rgba(23,60,49,.035) 0 44.5deg, rgba(191,141,63,.16) 44.5deg 45deg); box-shadow: 0 35px 75px rgba(41,51,43,.13), inset 0 0 0 14px rgba(255,255,255,.38); }
.yi-bagua-ring::before, .yi-bagua-ring::after { content: ""; position: absolute; inset: 12%; border: 1px solid rgba(191,141,63,.26); border-radius: 50%; pointer-events: none; }
.yi-bagua-ring::after { inset: 31%; border-color: rgba(23,60,49,.22); }
.yi-taiji { position: absolute; left: 50%; top: 50%; width: 31%; aspect-ratio: 1; border: 1px solid #112c24; border-radius: 50%; transform: translate(-50%,-50%); background: radial-gradient(circle at 50% 25%, #fff 0 5%, #183d31 5.5% 12.5%, transparent 13%), radial-gradient(circle at 50% 75%, #183d31 0 5%, #fff 5.5% 12.5%, transparent 13%), radial-gradient(circle at 50% 25%, #183d31 0 25%, transparent 25.5%), radial-gradient(circle at 50% 75%, #fff 0 25%, transparent 25.5%), linear-gradient(90deg, #183d31 0 50%, #fff 50%); box-shadow: 0 12px 28px rgba(23,60,49,.16); }
.yi-trigram { position: absolute; display: grid; justify-items: center; gap: 2px; min-width: 68px; padding: 5px 7px; transform: translate(-50%,-50%); color: var(--yi-ink); text-align: center; }
.yi-trigram b { font: 34px/1 sans-serif; }
.yi-trigram small { font-size: 11px; font-weight: 700; white-space: nowrap; }
.yi-trigram-qian { left: 50%; top: 8%; }.yi-trigram-dui { left: 79%; top: 21%; }.yi-trigram-li { left: 92%; top: 50%; }.yi-trigram-zhen { left: 79%; top: 79%; }.yi-trigram-xun { left: 50%; top: 92%; }.yi-trigram-kan { left: 21%; top: 79%; }.yi-trigram-gen { left: 8%; top: 50%; }.yi-trigram-kun { left: 21%; top: 21%; }
.yi-bagua-stage > p { margin: 20px 0 0; color: #877b68; font-size: 12px; letter-spacing: .2em; }

.yi-combine-section { padding: 92px 0; background: #f8f5ed; }
.yi-section-heading { display: flex; justify-content: space-between; gap: 50px; align-items: end; margin-bottom: 32px; }
.yi-section-heading h2, .yi-catalog-head h2 { margin: 0; color: var(--yi-ink); font: 700 clamp(36px, 4vw, 50px)/1.15 KaiTi, serif; }
.yi-section-heading > p { max-width: 540px; margin: 0; color: #68736c; line-height: 1.85; }
.yi-study-workspace { display: grid; grid-template-columns: 410px minmax(0,1fr); gap: 22px; align-items: stretch; }
.yi-selector-panel, .yi-result-card { border: 1px solid var(--yi-line); border-radius: 18px; background: #fff; box-shadow: 0 18px 48px rgba(44,52,46,.08); }
.yi-selector-panel { display: flex; flex-direction: column; justify-content: center; padding: 28px; }
.yi-selector-group header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.yi-selector-group header > span { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid #d8cbb4; border-radius: 50%; color: var(--yi-red); font: 700 11px/1 Georgia, serif; }
.yi-selector-group small { display: block; color: #9b8d75; font: 9px/1 Georgia, serif; letter-spacing: .14em; }
.yi-selector-group h3 { margin: 3px 0 0; font: 700 24px/1.1 KaiTi, serif; }
.yi-trigram-selector { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 7px; }
.yi-trigram-selector button { display: grid; justify-items: center; gap: 4px; min-width: 0; padding: 9px 4px 8px; border: 1px solid #e1d7c6; border-radius: 9px; color: #5e6a63; background: #faf7f0; font: inherit; cursor: pointer; }
.yi-trigram-selector button b { font: 25px/1 sans-serif; }
.yi-trigram-selector button span { font-size: 11px; font-weight: 700; }
.yi-trigram-selector button:hover { border-color: var(--trigram-color); }
.yi-trigram-selector button.active { color: #fff; border-color: var(--trigram-color); background: var(--trigram-color); box-shadow: 0 8px 18px color-mix(in srgb, var(--trigram-color) 25%, transparent); }
.yi-selector-divider { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; align-items: center; margin: 21px 0; color: #9c8d75; font-size: 10px; letter-spacing: .15em; }
.yi-selector-divider::before, .yi-selector-divider::after { content: ""; height: 1px; background: #e3d8c7; }

.yi-result-card { position: relative; overflow: hidden; padding: 34px 38px; background: linear-gradient(140deg, #fff 0 64%, #f3ebde 64%); }
.yi-result-watermark { position: absolute; right: 22px; bottom: -36px; color: rgba(23,60,49,.04); font: 700 180px/1 KaiTi, serif; pointer-events: none; }
.yi-result-head { position: relative; display: flex; align-items: center; gap: 26px; }
.yi-hexagram-lines { width: 92px; display: flex; flex-direction: column-reverse; gap: 8px; padding: 14px; border: 1px solid #dfd4c2; border-radius: 12px; background: #fffdf8; box-shadow: 0 10px 25px rgba(37,55,46,.08); }
.yi-line { display: flex; gap: 9px; width: 100%; height: 7px; }
.yi-line::before, .yi-line::after { content: ""; height: 100%; border-radius: 2px; background: var(--yi-ink); }
.yi-line.yang::before { width: 100%; }.yi-line.yang::after { display: none; }
.yi-line.yin::before, .yi-line.yin::after { width: calc(50% - 4.5px); }
.yi-result-head p { margin: 0 0 4px; color: #91744d; font-size: 11px; font-weight: 800; letter-spacing: .15em; }
.yi-result-head h3 { margin: 0; color: var(--yi-ink); font: 700 39px/1.15 KaiTi, serif; }
.yi-result-head > div:last-child > span { display: inline-block; margin-top: 6px; color: #89918c; font-size: 12px; }
.yi-result-facts { position: relative; display: grid; grid-template-columns: repeat(3,1fr); margin: 28px 0 0; border-block: 1px solid #e5dbc9; }
.yi-result-facts div { padding: 14px 10px; text-align: center; }
.yi-result-facts div + div { border-left: 1px solid #e5dbc9; }
.yi-result-facts dt { color: #9b8d75; font-size: 10px; letter-spacing: .12em; }
.yi-result-facts dd { margin: 5px 0 0; color: var(--yi-ink); font: 700 17px/1 KaiTi, serif; }
.yi-judgment { position: relative; min-height: 102px; margin-top: 24px; padding: 19px 21px; border-left: 3px solid var(--yi-red); background: rgba(255,255,255,.7); }
.yi-judgment span { color: var(--yi-red); font-size: 10px; font-weight: 800; letter-spacing: .17em; }
.yi-judgment p { margin: 9px 0 0; color: #4b5a52; font-size: 18px; line-height: 1.85; }
.yi-result-actions { position: relative; display: flex; align-items: center; gap: 18px; margin-top: 24px; }
.yi-result-actions button { padding: 12px 18px; border: 0; border-radius: 8px; color: #fff; background: var(--yi-red); font: 700 13px/1 inherit; cursor: pointer; }
.yi-result-actions a { color: var(--yi-ink); font-size: 13px; font-weight: 700; text-underline-offset: 4px; }

.yi-basics-section { padding: 86px 0; color: #eaf0ec; background: var(--yi-ink); }
.yi-section-heading-light h2 { color: #fff; }
.yi-section-heading-light > p { color: #bdc9c3; }
.yi-section-heading-light .tool-eyebrow { color: #e2b76f; }
.yi-trigram-card-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 13px; }
.yi-trigram-card { position: relative; min-height: 180px; overflow: hidden; padding: 23px; border: 1px solid rgba(255,255,255,.15); border-radius: 13px; background: rgba(255,255,255,.055); }
.yi-trigram-card::after { content: attr(data-symbol); position: absolute; right: -3px; bottom: -18px; color: rgba(255,255,255,.045); font: 92px/1 sans-serif; }
.yi-trigram-card header { display: flex; align-items: center; justify-content: space-between; }
.yi-trigram-card h3 { margin: 0; color: #fff; font: 700 28px/1 KaiTi, serif; }
.yi-trigram-card header span { color: #f1c67d; font: 34px/1 sans-serif; }
.yi-trigram-card p { margin: 17px 0 0; color: #c6d1cb; font-size: 13px; line-height: 1.75; }
.yi-trigram-card dl { display: flex; gap: 17px; margin: 16px 0 0; }
.yi-trigram-card dt { color: #82988d; font-size: 9px; letter-spacing: .12em; }
.yi-trigram-card dd { margin: 3px 0 0; color: #eef2ef; font-size: 12px; }

.yi-catalog-section { padding: 92px 0; background: #f8f5ed; }
.yi-catalog-head { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.yi-search { position: relative; width: min(330px,100%); }
.yi-search input { width: 100%; padding: 13px 42px 13px 15px; border: 1px solid #d8cbb6; border-radius: 10px; outline: none; color: var(--yi-ink); background: #fff; font: 13px/1.4 inherit; }
.yi-search input:focus { border-color: var(--yi-gold); box-shadow: 0 0 0 3px rgba(191,141,63,.12); }
.yi-search span:last-child { position: absolute; right: 14px; top: 10px; color: #9d8b6d; font-size: 19px; }
.yi-catalog-meta { display: flex; justify-content: space-between; gap: 20px; margin: 28px 0 15px; color: #8a8275; font-size: 11px; }
.yi-catalog-meta span:first-child { color: var(--yi-red); font-weight: 800; }
.yi-hexagram-grid { display: grid; grid-template-columns: repeat(8,minmax(0,1fr)); gap: 8px; }
.yi-hexagram-button { min-width: 0; padding: 12px 7px 10px; border: 1px solid #ded2bd; border-radius: 9px; color: #56645c; background: rgba(255,255,255,.78); text-align: left; font: inherit; cursor: pointer; }
.yi-hexagram-button:hover, .yi-hexagram-button.active { color: #fff; border-color: var(--yi-red); background: var(--yi-red); box-shadow: 0 8px 18px rgba(171,73,55,.16); }
.yi-hexagram-button small { display: block; opacity: .67; font: 9px/1 Georgia, serif; }
.yi-hexagram-button strong { display: block; margin-top: 5px; overflow: hidden; font: 700 16px/1.2 KaiTi, serif; text-overflow: ellipsis; white-space: nowrap; }
.yi-hexagram-button span { display: block; margin-top: 6px; font: 17px/1 sans-serif; letter-spacing: -.12em; }
.yi-empty { color: #8a8275; text-align: center; }

.yi-source-section { padding: 0 0 76px; }
.yi-source-card { display: grid; grid-template-columns: .55fr 1.45fr; gap: 60px; padding: 34px 40px; border: 1px solid rgba(23,60,49,.16); border-radius: 16px; background: #fff; }
.yi-source-card h2 { margin: 0; color: var(--yi-ink); font: 700 30px/1.2 KaiTi, serif; }
.yi-source-card p { margin: 0 0 10px; color: #66716a; font-size: 13px; line-height: 1.85; }
.yi-source-card a { color: var(--yi-ink); font-weight: 700; text-underline-offset: 3px; }

.yi-dialog { width: min(760px, calc(100% - 28px)); max-height: min(86vh, 850px); padding: 0; overflow: auto; border: 1px solid #d9ccb6; border-radius: 18px; color: #263a31; background: #fffdf8; box-shadow: 0 28px 80px rgba(18,37,29,.26); }
.yi-dialog::backdrop { background: rgba(18,31,25,.66); backdrop-filter: blur(5px); }
.yi-dialog-close { position: sticky; z-index: 5; float: right; top: 14px; right: 14px; display: grid; place-items: center; width: 37px; height: 37px; margin: 14px 14px -51px 0; border: 1px solid #d9ccb6; border-radius: 50%; color: var(--yi-ink); background: #fff; font-size: 22px; cursor: pointer; }
.yi-dialog-hero { display: flex; align-items: center; gap: 22px; padding: 40px 44px 28px; color: #fff; background: var(--yi-ink); }
.yi-dialog-symbol { color: #f0c276; font: 54px/1 sans-serif; }
.yi-dialog-hero p { margin: 0 0 6px; color: #c0d1c8; font-size: 11px; letter-spacing: .15em; }
.yi-dialog-hero h2 { margin: 0; font: 700 39px/1.1 KaiTi, serif; }
.yi-dialog-body { padding: 34px 44px 42px; }
.yi-dialog-body p { margin: 0 0 16px; font-size: 17px; line-height: 1.9; }
.yi-dialog-body p:first-child { color: var(--yi-red); font-size: 20px; }
.yi-dialog-source { margin-top: 27px; padding-top: 19px; border-top: 1px solid #e4d9c7; color: #7a7e79; font-size: 12px !important; }
.yi-dialog-source a { color: var(--yi-ink); font-weight: 700; }

@media (max-width: 1080px) {
    .tool-links { gap: 12px; }
    .tool-links a { font-size: 14px; }
    .yi-study-workspace { grid-template-columns: 360px minmax(0,1fr); }
    .yi-hexagram-grid { grid-template-columns: repeat(6,minmax(0,1fr)); }
}
@media (max-width: 860px) {
    .yi-hero-grid { grid-template-columns: 1fr; }
    .yi-bagua-ring { width: min(490px, 88vw); }
    .yi-study-workspace { grid-template-columns: 1fr; }
    .yi-trigram-card-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 720px) {
    .yi-hero { padding: 50px 0 58px; background: linear-gradient(180deg,#fbfaf6 0 48%,#eee5d5 48%); }
    .yi-hero-copy h1 { font-size: 51px; }
    .yi-hero-grid { gap: 45px; }
    .yi-bagua-stage { overflow: hidden; }
    .yi-section-heading, .yi-catalog-head { display: block; }
    .yi-section-heading > p { margin-top: 13px; }
    .yi-selector-panel, .yi-result-card { padding: 24px 19px; }
    .yi-result-head { gap: 18px; }
    .yi-result-head h3 { font-size: 33px; }
    .yi-hexagram-lines { width: 80px; }
    .yi-trigram-card-grid { grid-template-columns: 1fr; }
    .yi-search { margin-top: 20px; }
    .yi-catalog-meta { display: block; }
    .yi-catalog-meta span { display: block; margin-top: 6px; }
    .yi-hexagram-grid { grid-template-columns: repeat(4,minmax(0,1fr)); }
    .yi-source-card { grid-template-columns: 1fr; gap: 18px; padding: 27px 23px; }
    .yi-dialog-hero, .yi-dialog-body { padding-inline: 24px; }
}
@media (max-width: 420px) {
    .yi-hero-copy h1 { font-size: 45px; }
    .yi-trigram { min-width: 59px; }
    .yi-trigram b { font-size: 29px; }
    .yi-trigram small { font-size: 10px; }
    .yi-trigram-selector { grid-template-columns: repeat(4,minmax(0,1fr)); }
    .yi-result-head { align-items: flex-start; }
    .yi-result-facts { grid-template-columns: 1fr; }
    .yi-result-facts div + div { border-left: 0; border-top: 1px solid #e5dbc9; }
    .yi-result-actions { align-items: stretch; flex-direction: column; }
    .yi-result-actions button, .yi-result-actions a { text-align: center; }
    .yi-hexagram-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
}