:root {
    --navy: #102a43;
    --navy-2: #173f5f;
    --blue: #2f6f8f;
    --blue-soft: #e8f2f6;
    --teal: #2d7d73;
    --teal-soft: #e4f2ef;
    --amber: #c9892f;
    --amber-soft: #fff3dc;
    --red: #a94843;
    --red-soft: #fbe9e6;
    --paper: #f7f4ec;
    --white: #ffffff;
    --ink: #25364a;
    --muted: #637383;
    --line: #d8e0e6;
    --shadow: 0 14px 36px rgba(16, 42, 67, .10);
    --radius: 20px;
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: #fbfcfd;
    font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.72;
}

button,
input {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

a {
    color: inherit;
}

.ka-container {
    width: min(1180px, calc(100% - 36px));
    margin-inline: auto;
}

.ka-header {
    position: relative;
    z-index: 20;
    color: white;
    background:
        radial-gradient(circle at 86% 10%, rgba(255,255,255,.12), transparent 26%),
        linear-gradient(120deg, var(--navy), #163c59 60%, #1a4d60);
    box-shadow: 0 6px 24px rgba(16, 42, 67, .18);
}

.ka-header-inner {
    width: min(1380px, calc(100% - 32px));
    min-height: 88px;
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 14px 0;
}

.ka-title-wrap,
.ka-header-actions,
.ka-heading-meta {
    display: flex;
    align-items: center;
}

.ka-title-wrap {
    gap: 18px;
}

.ka-brand-block {
    padding-right: 18px;
    border-right: 1px solid rgba(255,255,255,.22);
    white-space: nowrap;
}

.ka-brand {
    font-weight: 900;
    letter-spacing: .035em;
}

.ka-brand-sub {
    margin-top: 1px;
    color: #c7d6e1;
    font-size: .76rem;
}

.ka-heading-meta {
    gap: 10px;
    margin-bottom: 3px;
    color: #c8d8e3;
    font-size: .8rem;
}

.ka-kicker {
    padding: 2px 9px;
    border: 1px solid rgba(255,255,255,.24);
    border-radius: 999px;
    color: #ffe4a8;
    background: rgba(255,255,255,.08);
    font-weight: 800;
}

.ka-header h1 {
    margin: 0;
    font-size: clamp(1.25rem, 2.2vw, 1.85rem);
    line-height: 1.25;
    letter-spacing: .015em;
}

.ka-header-actions {
    gap: 9px;
    flex-shrink: 0;
}

.ka-header-button {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 999px;
    color: white;
    background: rgba(255,255,255,.09);
    cursor: pointer;
    font-weight: 800;
    text-decoration: none;
    transition: .18s ease;
}

.ka-header-button:hover,
.ka-header-button:focus-visible {
    background: rgba(255,255,255,.18);
    transform: translateY(-1px);
}

.ka-hero {
    min-height: 330px;
    display: grid;
    grid-template-columns: 1.35fr .65fr;
    align-items: center;
    gap: 54px;
    padding-block: 54px;
}

.ka-eyebrow,
.ka-step-number,
.ka-panel-label {
    margin: 0 0 7px;
    color: var(--teal);
    font-size: .78rem;
    font-weight: 900;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.ka-hero h2,
.ka-section-heading h2,
.ka-summary h2 {
    margin: 0;
    color: var(--navy-2);
    font-size: clamp(1.72rem, 3.2vw, 2.55rem);
    line-height: 1.26;
}

.ka-lead {
    max-width: 720px;
    margin: 18px 0 0;
    color: #536679;
    font-size: 1.08rem;
}

.ka-bridge-card {
    position: relative;
    overflow: hidden;
    padding: 28px;
    border: 1px solid #d7e3e8;
    border-radius: 28px;
    text-align: center;
    background: white;
    box-shadow: var(--shadow);
}

.ka-bridge-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 6px;
    background: linear-gradient(90deg, var(--blue), var(--teal), var(--amber));
}

.ka-bridge-label {
    color: var(--muted);
    font-weight: 800;
}

.ka-bridge-formula {
    margin: 9px 0;
    color: var(--navy-2);
    font-size: 1.62rem;
    font-weight: 900;
}

.ka-bridge-arrow {
    color: var(--amber);
    font-size: 1.6rem;
    line-height: 1;
}

.ka-condition-line {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--line);
    color: var(--red);
    font-size: .88rem;
}

.ka-roadmap-card {
    position: relative;
    overflow: hidden;
    padding: 24px;
    border: 1px solid #d7e3e8;
    border-radius: 28px;
    background: white;
    box-shadow: var(--shadow);
}

.ka-roadmap-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 6px;
    background: linear-gradient(90deg, var(--blue), var(--teal), var(--amber));
}

.ka-roadmap-item {
    display: flex;
    align-items: center;
    gap: 13px;
}

.ka-roadmap-item b {
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--blue);
}

.ka-roadmap-item:nth-of-type(3) b {
    background: var(--teal);
}

.ka-roadmap-item:nth-of-type(5) b {
    background: var(--amber);
}

.ka-roadmap-item span,
.ka-roadmap-item strong,
.ka-roadmap-item small {
    display: block;
}

.ka-roadmap-item strong {
    color: var(--navy-2);
}

.ka-roadmap-item small {
    color: var(--muted);
    line-height: 1.45;
}

.ka-roadmap-arrow {
    margin: 4px 0 4px 17px;
    color: var(--amber);
    font-weight: 900;
}

.ka-section-nav {
    position: sticky;
    top: 0;
    z-index: 15;
    border-block: 1px solid #d9e2e8;
    background: rgba(255,255,255,.94);
    box-shadow: 0 5px 16px rgba(16, 42, 67, .05);
    backdrop-filter: blur(12px);
}

.ka-section-nav-inner {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    padding-block: 8px;
    scrollbar-width: thin;
}

.ka-section-nav a {
    flex: 0 0 auto;
    padding: 8px 13px;
    border-radius: 999px;
    color: #486174;
    text-decoration: none;
    font-size: .88rem;
    font-weight: 800;
}

.ka-section-nav a:hover,
.ka-section-nav a:focus-visible {
    color: var(--navy-2);
    background: var(--blue-soft);
}

.ka-section {
    padding-block: 66px;
    scroll-margin-top: 68px;
}

.ka-section-alt {
    background: var(--paper);
}

.ka-section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 28px;
    margin-bottom: 28px;
}

.ka-section-heading h2 {
    font-size: clamp(1.6rem, 2.5vw, 2.1rem);
}

.ka-section-heading p:not(.ka-step-number) {
    max-width: 770px;
    margin: 8px 0 0;
    color: var(--muted);
}

.ka-formula-group {
    margin-top: 24px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-formula-group-special {
    border-color: #d9cfb7;
    background: #fffdf8;
}

.ka-formula-group-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 28px;
    margin-bottom: 18px;
}

.ka-formula-group-head h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.28rem;
}

.ka-formula-group-head > p {
    max-width: 540px;
    margin: 0;
    color: var(--muted);
    font-size: .9rem;
}

.ka-formula-grid {
    display: grid;
    gap: 12px;
}

.ka-formula-grid-five {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.ka-formula-grid-four {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.ka-formula-card {
    min-width: 0;
    display: flex;
    flex-direction: column;
    padding: 16px;
    border: 1px solid #d9e3e8;
    border-radius: 15px;
    background: #fbfdfe;
}

.ka-formula-card-special {
    border-color: #e2d8bf;
    background: white;
}

.ka-formula-kind {
    align-self: flex-start;
    padding: 3px 9px;
    border-radius: 999px;
    color: #245f59;
    background: var(--teal-soft);
    font-size: .75rem;
    font-weight: 900;
}

.ka-formula-card h4 {
    margin: 10px 0 0;
    color: var(--navy-2);
    font-size: .95rem;
}

.ka-formula-math {
    min-height: 92px;
    display: grid;
    place-items: center;
    color: var(--navy-2);
    font-size: 1.02rem;
}

.ka-formula-card small {
    display: block;
    margin: -5px 0 9px;
    color: var(--red);
    font-size: .76rem;
}

.ka-proof-link {
    min-height: 39px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: auto;
    padding: 7px 11px;
    border: 1px solid #9dbdcd;
    border-radius: 10px;
    color: #235b76;
    background: var(--blue-soft);
    text-decoration: none;
    font-size: .84rem;
    font-weight: 900;
    transition: .17s ease;
}

.ka-proof-link:hover,
.ka-proof-link:focus-visible {
    color: white;
    background: var(--blue);
    transform: translateY(-1px);
}

.ka-stage-disclosure {
    scroll-margin-top: 68px;
    border-block: 1px solid #d7e1e7;
    background: var(--paper);
}

.ka-stage-disclosure-teal {
    border-top: 0;
    background: #eef6f4;
}

.ka-stage-disclosure > summary {
    width: min(1180px, calc(100% - 36px));
    min-height: 94px;
    display: flex;
    align-items: center;
    gap: 16px;
    margin-inline: auto;
    padding: 17px 0;
    cursor: pointer;
    list-style: none;
}

.ka-stage-disclosure > summary::-webkit-details-marker,
.ka-inner-disclosure > summary::-webkit-details-marker,
.ka-extension-card > summary::-webkit-details-marker {
    display: none;
}

.ka-stage-summary-number {
    width: 46px;
    height: 46px;
    flex: 0 0 46px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--blue);
    font-size: 1.12rem;
    font-weight: 900;
}

.ka-stage-disclosure-teal .ka-stage-summary-number {
    background: var(--teal);
}

.ka-stage-disclosure > summary > span:nth-child(2) {
    flex: 1;
}

.ka-stage-disclosure > summary strong,
.ka-stage-disclosure > summary small {
    display: block;
}

.ka-stage-disclosure > summary strong {
    color: var(--navy-2);
    font-size: 1.16rem;
}

.ka-stage-disclosure > summary small {
    margin-top: 2px;
    color: var(--muted);
}

.ka-stage-summary-action {
    flex: 0 0 auto;
    padding: 7px 12px;
    border: 1px solid #b9cad4;
    border-radius: 999px;
    color: #496275;
    background: rgba(255,255,255,.72);
    font-size: .8rem;
    font-weight: 900;
}

.ka-stage-disclosure[open] > summary {
    border-bottom: 1px dashed #c8d4db;
}

.ka-stage-content {
    padding-block: 48px 60px;
}

.ka-extension-proof-area {
    margin-top: 48px;
    padding-top: 42px;
    border-top: 1px solid #d4dee4;
    scroll-margin-top: 75px;
}

.ka-next-step {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-top: 24px;
    padding: 18px 20px;
    border: 1px solid #b9d7d2;
    border-radius: 16px;
    background: var(--teal-soft);
}

.ka-next-step p {
    margin: 0;
    color: #315f5a;
    font-weight: 800;
}

.ka-next-step a {
    flex: 0 0 auto;
    padding: 9px 14px;
    border-radius: 999px;
    color: white;
    background: var(--teal);
    text-decoration: none;
    font-weight: 900;
}

.ka-mini-condition,
.ka-proof-recipe {
    flex: 0 0 auto;
    padding: 12px 16px;
    border: 1px solid #bcd9d4;
    border-radius: 14px;
    color: #245f59;
    background: var(--teal-soft);
    font-size: .88rem;
}

.ka-proof-recipe {
    max-width: 330px;
    line-height: 1.65;
}

.ka-control-card {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: white;
    box-shadow: 0 8px 24px rgba(16,42,67,.06);
}

.ka-definition-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 24px;
    margin-bottom: 18px;
    padding: 22px 24px;
    border: 1px solid #c9dbe4;
    border-radius: var(--radius);
    background: linear-gradient(135deg, #fff, #f1f7fa);
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-definition-card h3,
.ka-quotient-guide h3,
.ka-law-summary h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.25rem;
}

.ka-definition-card p:not(.ka-panel-label) {
    margin: 8px 0 0;
    color: #526779;
}

.ka-definition-formula {
    padding: 14px 18px;
    border: 1px solid #b9d2df;
    border-radius: 15px;
    text-align: center;
    background: white;
}

.ka-definition-formula span {
    display: block;
    padding-top: 10px;
    border-top: 1px dashed var(--line);
    color: var(--teal);
    font-weight: 900;
}

.ka-control-grid {
    display: grid;
    grid-template-columns: .55fr 1fr 1fr;
    align-items: end;
    gap: 22px;
}

.ka-control-grid label {
    display: grid;
    gap: 7px;
    color: #385266;
    font-size: .9rem;
    font-weight: 850;
}

.ka-control-grid input[type="number"] {
    width: 100%;
    min-height: 43px;
    padding: 7px 11px;
    border: 1px solid #bac8d3;
    border-radius: 10px;
    color: var(--navy-2);
    background: #fbfdfe;
    font-weight: 900;
}

.ka-control-grid input[type="range"] {
    width: 100%;
    accent-color: var(--blue);
}

.ka-law-tabs {
    display: flex;
    gap: 8px;
    margin: 20px 0;
    overflow-x: auto;
    padding: 2px 2px 7px;
    scrollbar-width: thin;
}

.ka-law-tab {
    flex: 1 0 auto;
    min-height: 43px;
    padding: 9px 15px;
    border: 1px solid #cad6de;
    border-radius: 12px;
    color: #526879;
    background: white;
    cursor: pointer;
    font-weight: 850;
    transition: .17s ease;
}

.ka-law-tab:hover,
.ka-law-tab:focus-visible {
    border-color: #86aabd;
    color: var(--navy-2);
}

.ka-law-tab.active {
    border-color: var(--blue);
    color: white;
    background: var(--blue);
    box-shadow: 0 6px 14px rgba(47,111,143,.2);
}

.ka-log-tab.active {
    border-color: var(--teal);
    background: var(--teal);
    box-shadow: 0 6px 14px rgba(45,125,115,.2);
}

.ka-proof-layout,
.ka-log-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 20px;
}

.ka-visual-panel,
.ka-proof-panel,
.ka-log-proof-card,
.ka-example-card,
.ka-extension-card,
.ka-condition-card,
.ka-quiz,
.ka-dictionary {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
    box-shadow: 0 9px 28px rgba(16,42,67,.07);
}

.ka-visual-panel,
.ka-proof-panel,
.ka-log-proof-card,
.ka-example-card {
    min-height: 430px;
    padding: 24px;
}

.ka-visual-panel h3,
.ka-log-proof-card h3,
.ka-dictionary h3,
.ka-quiz h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.28rem;
}

.ka-factor-visual {
    min-height: 250px;
    display: grid;
    align-content: center;
    gap: 16px;
    margin-top: 15px;
    padding: 20px;
    border: 1px dashed #b9cbd5;
    border-radius: 16px;
    background: #f8fbfc;
}

.ka-factor-line {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.ka-factor-line-label {
    min-width: 80px;
    color: #53697b;
    font-size: .82rem;
    font-weight: 850;
}

.ka-chip {
    min-width: 40px;
    min-height: 40px;
    display: inline-grid;
    place-items: center;
    padding: 5px 10px;
    border: 2px solid #89b1c5;
    border-radius: 10px;
    color: #174763;
    background: #e5f2f7;
    font-weight: 900;
    box-shadow: inset 0 -2px 0 rgba(47,111,143,.08);
}

.ka-chip.amber {
    border-color: #dfb76b;
    color: #6d4914;
    background: #fff1d5;
}

.ka-chip.teal {
    border-color: #84beb6;
    color: #1f5e57;
    background: #e2f2ef;
}

.ka-chip.cancelled {
    position: relative;
    opacity: .58;
}

.ka-chip.cancelled::after {
    content: "";
    position: absolute;
    left: 5px;
    right: 5px;
    top: 50%;
    height: 2px;
    background: var(--red);
    transform: rotate(-25deg);
}

.ka-group {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 5px;
    padding: 8px;
    border: 1px solid #9fc3d3;
    border-radius: 12px;
    background: white;
}

.ka-times,
.ka-arrow-small {
    color: var(--amber);
    font-weight: 900;
}

.ka-times {
    min-width: .72em;
    display: inline-grid;
    place-items: center;
    font-size: 1.08rem;
    line-height: 1;
}

.ka-fraction-stack {
    display: inline-grid;
    grid-template-rows: auto 2px auto;
    align-items: stretch;
    justify-items: stretch;
    gap: 5px;
    padding: 6px;
    vertical-align: middle;
}

.ka-fraction-stack.wide {
    min-width: min(420px, calc(100% - 100px));
    max-width: 100%;
    flex: 1 1 360px;
}

.ka-fraction-row {
    min-height: 42px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.ka-fraction-row-label {
    flex: 0 0 42px;
    color: #53697b;
    font-size: .78rem;
    font-weight: 900;
}

.ka-fraction-factors {
    min-width: 0;
    display: flex;
    flex: 1 1 auto;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.ka-fraction-bar {
    width: 100%;
    min-width: 52px;
    height: 2px;
    background: var(--navy-2);
}

.ka-numeric-check {
    margin-top: 15px;
    padding: 12px 15px;
    border-left: 4px solid var(--amber);
    border-radius: 0 12px 12px 0;
    color: #5c4a2e;
    background: var(--amber-soft);
    font-weight: 800;
}

.ka-rule-box {
    margin: 10px 0 20px;
    padding: 15px;
    border: 1px solid #b9d2df;
    border-radius: 14px;
    color: var(--navy-2);
    text-align: center;
    background: var(--blue-soft);
    font-size: 1.28rem;
    font-weight: 900;
}

.ka-rule-log {
    border-color: #aed4ce;
    background: var(--teal-soft);
}

.ka-proof-steps {
    display: grid;
    gap: 12px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: proof;
}

.ka-proof-steps li {
    position: relative;
    min-height: 48px;
    padding: 10px 12px 10px 50px;
    border: 1px solid #e0e6ea;
    border-radius: 12px;
    color: #455a6b;
    background: #fbfcfd;
    counter-increment: proof;
}

.ka-proof-steps li::before {
    content: counter(proof);
    position: absolute;
    left: 12px;
    top: 10px;
    width: 26px;
    height: 26px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--blue);
    font-size: .8rem;
    font-weight: 900;
}

.ka-proof-condition,
.ka-source-law {
    margin-top: 16px;
    padding: 10px 13px;
    border-radius: 10px;
    color: #7a3d38;
    background: var(--red-soft);
    font-size: .87rem;
}

.ka-quotient-guide,
.ka-law-summary {
    margin-top: 22px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-quotient-guide-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 22px;
}

.ka-quotient-guide-head > p {
    max-width: 520px;
    margin: 0;
    color: var(--muted);
    font-size: .9rem;
}

.ka-case-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.ka-case-card {
    padding: 17px;
    border: 1px solid #d8e3e8;
    border-radius: 15px;
    background: #fbfdfe;
}

.ka-case-card:nth-child(2) {
    border-color: #d7c79f;
    background: #fffaf0;
}

.ka-case-card:nth-child(3) {
    border-color: #d9bfbc;
    background: #fff8f6;
}

.ka-case-badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    color: #245f59;
    background: var(--teal-soft);
    font-size: .78rem;
    font-weight: 900;
}

.ka-case-card h4 {
    margin: 10px 0 0;
    color: var(--navy-2);
}

.ka-case-card p {
    margin: 8px 0 0;
    color: #586c7b;
    font-size: .9rem;
}

.ka-law-summary-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.ka-law-summary-grid article {
    min-width: 0;
    padding: 14px 10px;
    border: 1px solid #d9e3e8;
    border-radius: 14px;
    text-align: center;
    background: #fbfdfe;
}

.ka-law-summary-grid span,
.ka-law-summary-grid small {
    display: block;
}

.ka-law-summary-grid span {
    color: var(--teal);
    font-size: .82rem;
    font-weight: 900;
}

.ka-law-summary-grid small {
    color: var(--muted);
    line-height: 1.55;
}

.ka-extension-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.ka-extension-card,
.ka-condition-card {
    padding: 22px;
}

.ka-extension-card {
    scroll-margin-top: 76px;
}

.ka-extension-card > summary {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 8px 14px;
    cursor: pointer;
    list-style: none;
}

.ka-extension-card > summary .ka-extension-tag {
    grid-column: 1;
    justify-self: start;
}

.ka-extension-card > summary strong {
    grid-column: 1;
    color: var(--navy-2);
    font-size: 1.12rem;
}

.ka-extension-card > summary small {
    grid-column: 2;
    grid-row: 1 / span 2;
    padding: 6px 10px;
    border-radius: 999px;
    color: #3f6476;
    background: var(--blue-soft);
    font-size: .76rem;
    font-weight: 900;
}

.ka-extension-card[open] > summary {
    margin-bottom: 15px;
    padding-bottom: 13px;
    border-bottom: 1px dashed var(--line);
}

.ka-extension-card h3,
.ka-condition-card h3 {
    margin: 9px 0 14px;
    color: var(--navy-2);
    font-size: 1.2rem;
}

.ka-extension-tag {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    color: #245f59;
    background: var(--teal-soft);
    font-size: .76rem;
    font-weight: 900;
}

.ka-derivation {
    color: #425a6d;
}

.ka-derivation-steps > span {
    display: block;
    margin-top: 8px;
    color: #526779;
}

.ka-negative-callout {
    margin: 16px 0 20px;
    padding: 18px 20px;
    border: 3px solid var(--red);
    border-radius: 16px;
    text-align: center;
    color: #75332f;
    background: linear-gradient(135deg, #fff9f7, var(--red-soft));
    box-shadow: 0 8px 20px rgba(169, 72, 67, .12);
}

.ka-negative-callout span,
.ka-negative-callout strong,
.ka-negative-callout div {
    display: block;
}

.ka-negative-callout span {
    font-size: .76rem;
    font-weight: 900;
    letter-spacing: .12em;
}

.ka-negative-callout strong {
    margin: 3px 0 5px;
    font-size: clamp(1.45rem, 3vw, 2rem);
    line-height: 1.25;
}

.ka-negative-callout div {
    color: var(--navy-2);
    font-size: 1.08rem;
    font-weight: 900;
}

.ka-warning {
    margin: 14px 0 0;
    padding: 10px 12px;
    border-radius: 10px;
    color: #75473d;
    background: #fbefe9;
    font-size: .88rem;
}

.ka-dependency-strip {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 22px;
    padding: 16px;
    border: 1px dashed #b6c7d2;
    border-radius: 16px;
    color: #415a6c;
    background: rgba(255,255,255,.68);
    font-size: .9rem;
    font-weight: 850;
}

.ka-dependency-strip span {
    padding: 7px 11px;
    border-radius: 9px;
    background: white;
}

.ka-dependency-strip b {
    color: var(--amber);
}

.ka-rigor-note {
    margin-top: 14px;
    padding: 12px 15px;
    border: 1px solid #d6cab2;
    border-radius: 13px;
    color: #5d513e;
    background: rgba(255,255,255,.62);
    font-size: .88rem;
}

.ka-rigor-note summary {
    color: #5e4a29;
    cursor: pointer;
    font-weight: 900;
}

.ka-rigor-note p {
    margin: 10px 0 0;
}

.ka-conversion-controls .ka-control-grid {
    grid-template-columns: .45fr .85fr 1.7fr;
}

.ka-conversion-presets {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.ka-conversion-presets > span {
    width: 100%;
    color: #385266;
    font-size: .9rem;
    font-weight: 850;
}

.ka-conversion-presets button {
    min-height: 38px;
    padding: 6px 10px;
    border: 1px solid #bfd0d9;
    border-radius: 10px;
    color: #34556a;
    background: #fbfdfe;
    cursor: pointer;
    font-weight: 800;
}

.ka-conversion-presets button:hover,
.ka-conversion-presets button:focus-visible,
.ka-conversion-presets button.active {
    border-color: var(--teal);
    color: #225e57;
    background: var(--teal-soft);
}

.ka-conversion-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.ka-conversion-card,
.ka-conversion-guide {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
    box-shadow: 0 9px 28px rgba(16,42,67,.07);
}

.ka-conversion-equation {
    min-height: 76px;
    display: grid;
    place-items: center;
    padding: 14px;
    border: 1px solid #bdd4df;
    border-radius: 15px;
    color: var(--navy-2);
    background: var(--blue-soft);
    font-size: 1.5rem;
    font-weight: 900;
}

.ka-conversion-equation-log {
    border-color: #b4d5cf;
    background: var(--teal-soft);
}

.ka-conversion-arrow {
    display: grid;
    place-items: center;
    padding: 8px 0;
    color: var(--amber);
    font-size: 1.25rem;
    font-weight: 900;
    line-height: 1.2;
}

.ka-conversion-arrow span {
    color: var(--muted);
    font-size: .78rem;
}

.ka-role-map {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 16px;
}

.ka-role-map div {
    padding: 10px 7px;
    border: 1px solid #dce5e9;
    border-radius: 11px;
    text-align: center;
    background: #fbfdfe;
}

.ka-role-map span,
.ka-role-map b,
.ka-role-map small {
    display: block;
}

.ka-role-map span {
    color: var(--muted);
    font-size: .74rem;
}

.ka-role-map b {
    color: var(--navy-2);
    font-size: 1.18rem;
}

.ka-role-map small {
    color: var(--teal);
    font-size: .72rem;
    font-weight: 850;
}

.ka-conversion-guide ol {
    display: grid;
    gap: 11px;
    margin: 13px 0 0;
    padding: 0;
    list-style: none;
    counter-reset: conversion;
}

.ka-conversion-guide li {
    position: relative;
    min-height: 58px;
    padding: 10px 12px 10px 53px;
    border: 1px solid #dce5e9;
    border-radius: 12px;
    background: #fbfdfd;
    counter-increment: conversion;
}

.ka-conversion-guide li::before {
    content: counter(conversion);
    position: absolute;
    left: 12px;
    top: 12px;
    width: 29px;
    height: 29px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--teal);
    font-size: .8rem;
    font-weight: 900;
}

.ka-conversion-guide li b,
.ka-conversion-guide li span {
    display: block;
}

.ka-conversion-guide li b {
    color: #285e59;
}

.ka-conversion-guide li span {
    color: var(--muted);
    font-size: .86rem;
}

.ka-conversion-template {
    margin-top: 14px;
    padding: 8px 12px;
    border-radius: 13px;
    color: var(--navy-2);
    background: var(--amber-soft);
    font-weight: 900;
}

.ka-conversion-check {
    margin: 12px 0 0;
    color: #416173;
    text-align: center;
    font-size: .88rem;
    font-weight: 800;
}

.ka-transition-note {
    margin-top: 22px;
    padding: 14px 17px;
    border-left: 5px solid var(--amber);
    border-radius: 0 13px 13px 0;
    color: #5e4c31;
    background: var(--amber-soft);
}

.ka-log-overview {
    margin-top: 22px;
    padding: 22px;
    border: 1px solid #b8d4cf;
    border-radius: var(--radius);
    background: rgba(255,255,255,.78);
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-log-overview-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 22px;
}

.ka-log-overview-head h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.24rem;
}

.ka-log-overview-head > p {
    max-width: 420px;
    margin: 0;
    color: var(--muted);
    font-size: .88rem;
}

.ka-log-overview-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 11px;
    margin-top: 16px;
}

.ka-log-overview-grid article {
    min-width: 0;
    min-height: 128px;
    display: grid;
    align-content: center;
    padding: 13px;
    border: 1px solid #d6e3e0;
    border-radius: 13px;
    text-align: center;
    background: #fbfdfd;
}

.ka-log-overview-grid article.extended {
    border-color: #ddc89d;
    background: #fffaf0;
}

.ka-log-overview-grid article > span {
    color: var(--teal);
    font-size: .78rem;
    font-weight: 900;
}

.ka-log-overview-grid article.extended > span {
    color: #8b5d19;
}

.ka-inner-disclosure {
    margin-top: 24px;
    border: 1px solid #b8d4cf;
    border-radius: var(--radius);
    background: rgba(255,255,255,.7);
    scroll-margin-top: 76px;
}

.ka-inner-disclosure > summary {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 2px 16px;
    padding: 20px 22px;
    cursor: pointer;
    list-style: none;
}

.ka-inner-disclosure > summary > span {
    grid-row: 1 / span 2;
    padding: 5px 9px;
    border-radius: 999px;
    color: #2a645d;
    background: var(--teal-soft);
    font-size: .76rem;
    font-weight: 900;
}

.ka-inner-disclosure > summary strong,
.ka-inner-disclosure > summary small {
    display: block;
}

.ka-inner-disclosure > summary strong {
    color: var(--navy-2);
    font-size: 1.12rem;
}

.ka-inner-disclosure > summary small {
    color: var(--muted);
}

.ka-inner-disclosure[open] > summary {
    border-bottom: 1px dashed #c5d7d4;
}

.ka-inner-content {
    padding: 32px 22px 24px;
}

.ka-log-controls {
    grid-template-columns: .55fr 1fr 1fr 1fr;
}

.ka-log-proof-card,
.ka-example-card {
    min-height: 465px;
}

.ka-chain {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.ka-chain-step {
    position: relative;
    padding: 12px 14px;
    border: 1px solid #dce5e8;
    border-radius: 12px;
    background: #fbfdfd;
}

.ka-chain-step + .ka-chain-step::before {
    content: "↓";
    position: absolute;
    top: -19px;
    left: 50%;
    color: var(--amber);
    font-weight: 900;
    transform: translateX(-50%);
}

.ka-chain-reason {
    display: inline-block;
    margin-right: 7px;
    padding: 2px 7px;
    border-radius: 999px;
    color: #2c645e;
    background: var(--teal-soft);
    font-size: .72rem;
    font-weight: 900;
}

.ka-source-law {
    color: #245f59;
    background: var(--teal-soft);
}

.ka-example-card {
    display: flex;
    flex-direction: column;
}

.ka-example-math {
    flex: 1;
    display: grid;
    place-items: center;
    min-height: 235px;
    margin-top: 10px;
    padding: 22px;
    border: 1px dashed #b9cbd5;
    border-radius: 16px;
    color: var(--navy-2);
    text-align: center;
    background: #f8fbfc;
    font-size: 1.08rem;
}

.ka-example-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 9px;
    margin-top: 14px;
}

.ka-example-values div {
    padding: 8px;
    border-radius: 10px;
    text-align: center;
    background: var(--blue-soft);
}

.ka-example-values span,
.ka-example-values b {
    display: block;
}

.ka-example-values span {
    color: var(--muted);
    font-size: .76rem;
}

.ka-example-values b {
    color: var(--navy-2);
    font-size: 1.12rem;
}

.ka-example-card > p {
    margin: 12px 0 0;
    color: #4e6273;
    text-align: center;
    font-weight: 800;
}

.ka-dictionary {
    margin-top: 22px;
    padding: 22px;
}

.ka-table-wrap {
    overflow-x: auto;
    margin-top: 14px;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

th,
td {
    padding: 13px 15px;
    border-bottom: 1px solid #e0e6ea;
    text-align: left;
}

th {
    color: #345369;
    background: var(--blue-soft);
    font-size: .88rem;
}

td {
    color: #4c6071;
}

.ka-condition-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.ka-error-list strong {
    color: var(--red);
}

.ka-big-condition,
.ka-not-equal {
    padding: 15px;
    border-radius: 13px;
    color: var(--navy-2);
    text-align: center;
    background: var(--blue-soft);
    font-size: 1.25rem;
    font-weight: 900;
}

.ka-not-equal {
    color: #7a3d38;
    background: var(--red-soft);
}

.ka-condition-card ul {
    margin: 14px 0 0;
    padding-left: 21px;
}

.ka-counterexample {
    margin-top: 13px;
    padding: 12px;
    border-left: 4px solid var(--amber);
    border-radius: 0 10px 10px 0;
    color: #5f4a2a;
    background: var(--amber-soft);
}

.ka-quiz {
    display: grid;
    grid-template-columns: .85fr 1.4fr;
    gap: 22px;
    margin-top: 20px;
    padding: 24px;
}

.ka-quiz h3 {
    font-size: 1.18rem;
}

.ka-quiz p:not(.ka-step-number) {
    margin: 4px 0 0;
    color: var(--muted);
}

.ka-quiz-options {
    display: grid;
    gap: 9px;
}

.ka-quiz-options button {
    padding: 11px 14px;
    border: 1px solid #c8d5dd;
    border-radius: 11px;
    color: #3f586a;
    text-align: left;
    background: #fbfcfd;
    cursor: pointer;
    transition: .16s ease;
}

.ka-quiz-options button:hover,
.ka-quiz-options button:focus-visible {
    border-color: var(--blue);
    background: var(--blue-soft);
}

.ka-quiz-options button.correct {
    border-color: var(--teal);
    color: #1f625a;
    background: var(--teal-soft);
}

.ka-quiz-options button.wrong {
    border-color: var(--red);
    color: #7a3d38;
    background: var(--red-soft);
}

.ka-quiz-feedback {
    grid-column: 2;
    min-height: 30px;
    color: #53697b;
    font-size: .9rem;
    font-weight: 800;
}

.ka-summary {
    padding-block: 66px 74px;
    text-align: center;
}

.ka-comparison-block {
    margin-top: 20px;
    padding: 23px;
    border: 1px solid #bfd4df;
    border-radius: var(--radius);
    background: linear-gradient(135deg, #fff, #f3f8fa);
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-comparison-extended {
    border-color: #ddcda8;
    background: linear-gradient(135deg, #fff, #fffaf0);
}

.ka-comparison-title {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.ka-comparison-title > span {
    flex: 0 0 auto;
    padding: 4px 10px;
    border-radius: 999px;
    color: #245f59;
    background: var(--teal-soft);
    font-size: .78rem;
    font-weight: 900;
}

.ka-comparison-extended .ka-comparison-title > span {
    color: #7a531b;
    background: var(--amber-soft);
}

.ka-comparison-title h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.2rem;
}

.ka-comparison-table th:first-child {
    width: 25%;
}

.ka-comparison-table th:nth-child(2) {
    width: 43%;
}

.ka-comparison-table td:nth-child(2) {
    color: var(--navy-2);
    font-weight: 800;
}

.ka-comparison-condition {
    margin: 18px 0 0;
    padding: 13px 16px;
    border-left: 5px solid var(--red);
    border-radius: 0 12px 12px 0;
    color: #713d39;
    background: var(--red-soft);
    font-weight: 800;
}

.ka-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 27px;
}

.ka-summary-grid div {
    min-height: 142px;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 8px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 17px;
    background: white;
    box-shadow: 0 8px 24px rgba(16,42,67,.06);
}

.ka-summary-grid b {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: white;
    background: var(--blue);
}

.ka-summary-grid span {
    color: #41596b;
    font-weight: 800;
}

footer {
    color: #d9e5ed;
    background: var(--navy);
}

.ka-footer-inner {
    min-height: 108px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-block: 22px;
}

.ka-footer-inner p {
    margin: 3px 0 0;
    color: #aebfcb;
    font-size: .88rem;
}

.ka-footer-inner a {
    padding: 8px 13px;
    border: 1px solid rgba(255,255,255,.22);
    border-radius: 999px;
    text-decoration: none;
    font-weight: 800;
}

body.eye-mode {
    --paper: #e9e3d4;
    --white: #f4efdf;
    --ink: #2e3b43;
    --line: #cfc7b5;
    background: #f0eadb;
}

body.eye-mode .ka-control-card,
body.eye-mode .ka-visual-panel,
body.eye-mode .ka-proof-panel,
body.eye-mode .ka-log-proof-card,
body.eye-mode .ka-example-card,
body.eye-mode .ka-extension-card,
body.eye-mode .ka-condition-card,
body.eye-mode .ka-quiz,
body.eye-mode .ka-dictionary,
body.eye-mode .ka-summary-grid div,
body.eye-mode .ka-law-tab,
body.eye-mode .ka-bridge-card,
body.eye-mode .ka-definition-card,
body.eye-mode .ka-definition-formula,
body.eye-mode .ka-quotient-guide,
body.eye-mode .ka-law-summary,
body.eye-mode .ka-case-card,
body.eye-mode .ka-law-summary-grid article,
body.eye-mode .ka-roadmap-card,
body.eye-mode .ka-formula-group,
body.eye-mode .ka-formula-card,
body.eye-mode .ka-conversion-card,
body.eye-mode .ka-conversion-guide,
body.eye-mode .ka-inner-disclosure,
body.eye-mode .ka-conversion-presets button,
body.eye-mode .ka-log-overview,
body.eye-mode .ka-log-overview-grid article,
body.eye-mode .ka-comparison-block {
    background: #f4efdf;
}

body.eye-mode .ka-factor-visual,
body.eye-mode .ka-example-math,
body.eye-mode .ka-chain-step,
body.eye-mode .ka-proof-steps li {
    background: #eee8d8;
}

body.eye-mode .ka-stage-disclosure,
body.eye-mode .ka-stage-disclosure-teal {
    background: #e9e3d4;
}

@media (max-width: 1100px) {
    .ka-header-inner {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .ka-header-actions {
        width: 100%;
        flex-wrap: wrap;
    }
}

@media (max-width: 920px) {
    .ka-hero,
    .ka-proof-layout,
    .ka-log-layout,
    .ka-condition-grid,
    .ka-definition-card {
        grid-template-columns: 1fr;
    }

    .ka-hero {
        gap: 28px;
        padding-block: 42px;
    }

    .ka-bridge-card {
        width: min(100%, 480px);
    }

    .ka-extension-grid {
        grid-template-columns: 1fr;
    }

    .ka-formula-grid-five {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .ka-formula-grid-four {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ka-log-overview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ka-case-grid {
        grid-template-columns: 1fr;
    }

    .ka-law-summary-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ka-quotient-guide-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .ka-log-controls {
        grid-template-columns: repeat(2, 1fr);
    }

    .ka-section-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .ka-proof-recipe {
        max-width: 100%;
    }

    .ka-summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .ka-conversion-layout {
        grid-template-columns: 1fr;
    }

    .ka-log-overview-head,
    .ka-comparison-title {
        align-items: flex-start;
        flex-direction: column;
    }

    .ka-conversion-controls .ka-control-grid {
        grid-template-columns: .55fr 1fr;
    }

    .ka-conversion-presets {
        grid-column: 1 / -1;
    }
}

@media (max-width: 680px) {
    .ka-container {
        width: min(100% - 24px, 1180px);
    }

    .ka-header-inner {
        width: min(100% - 24px, 1380px);
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .ka-brand-block {
        display: none;
    }

    .ka-header-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .ka-header-button {
        flex: 1 1 42%;
    }

    .ka-stage-disclosure > summary {
        width: min(100% - 24px, 1180px);
        align-items: flex-start;
        gap: 11px;
    }

    .ka-stage-summary-number {
        width: 38px;
        height: 38px;
        flex-basis: 38px;
    }

    .ka-stage-summary-action {
        display: none;
    }

    .ka-heading-meta {
        flex-wrap: wrap;
    }

    .ka-section {
        padding-block: 48px;
    }

    .ka-control-grid,
    .ka-log-controls,
    .ka-conversion-controls .ka-control-grid {
        grid-template-columns: 1fr;
        gap: 13px;
    }

    .ka-conversion-presets {
        grid-column: auto;
    }

    .ka-formula-group {
        padding: 18px;
    }

    .ka-formula-group-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
    }

    .ka-formula-grid-five,
    .ka-formula-grid-four {
        grid-template-columns: 1fr;
    }

    .ka-formula-math {
        min-height: 76px;
    }

    .ka-next-step {
        align-items: stretch;
        flex-direction: column;
    }

    .ka-next-step a {
        text-align: center;
    }

    .ka-role-map {
        grid-template-columns: 1fr;
    }

    .ka-inner-disclosure > summary {
        grid-template-columns: 1fr;
    }

    .ka-inner-disclosure > summary > span {
        grid-row: auto;
        justify-self: start;
    }

    .ka-visual-panel,
    .ka-proof-panel,
    .ka-log-proof-card,
    .ka-example-card {
        min-height: 0;
        padding: 18px;
    }

    .ka-factor-visual {
        min-height: 210px;
        padding: 14px;
    }

    .ka-chip {
        min-width: 35px;
        min-height: 35px;
        padding: 4px 8px;
    }

    .ka-fraction-stack.wide {
        min-width: 100%;
        flex-basis: 100%;
    }

    .ka-log-overview-grid {
        grid-template-columns: 1fr;
    }

    .ka-log-overview,
    .ka-comparison-block {
        padding: 17px;
    }

    .ka-quiz {
        grid-template-columns: 1fr;
        padding: 18px;
    }

    .ka-quiz-feedback {
        grid-column: 1;
    }

    .ka-summary-grid {
        grid-template-columns: 1fr;
    }

    .ka-law-summary-grid {
        grid-template-columns: 1fr;
    }

    .ka-summary-grid div {
        min-height: 115px;
    }

    .ka-footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media print {
    @page {
        size: A4;
        margin: 13mm;
    }

    body {
        color: #111;
        background: white;
        font-size: 10.5pt;
    }

    .ka-header,
    .ka-section-nav,
    .ka-control-card,
    .ka-law-tabs,
    .ka-quiz,
    footer {
        display: none !important;
    }

    .ka-stage-disclosure > summary,
    .ka-inner-disclosure > summary {
        display: none !important;
    }

    .ka-stage-disclosure:not([open]) > :not(summary),
    .ka-inner-disclosure:not([open]) > :not(summary),
    .ka-extension-card:not([open]) > :not(summary) {
        display: block !important;
    }

    .ka-hero {
        min-height: auto;
        padding-block: 0 20px;
    }

    .ka-section,
    .ka-summary {
        padding-block: 20px;
    }

    .ka-section-alt {
        background: white;
    }

    .ka-visual-panel,
    .ka-proof-panel,
    .ka-log-proof-card,
    .ka-example-card,
    .ka-extension-card,
    .ka-condition-card,
    .ka-dictionary,
    .ka-bridge-card,
    .ka-definition-card,
    .ka-quotient-guide,
    .ka-law-summary,
    .ka-case-card {
        break-inside: avoid;
        box-shadow: none;
    }

    .ka-roadmap-card,
    .ka-formula-group,
    .ka-formula-card,
    .ka-conversion-card,
    .ka-conversion-guide,
    .ka-inner-disclosure,
    .ka-log-overview,
    .ka-comparison-block {
        break-inside: avoid;
        box-shadow: none;
    }

    .ka-proof-layout,
    .ka-log-layout,
    .ka-extension-grid,
    .ka-condition-grid {
        gap: 10px;
    }

    .ka-factor-visual {
        min-height: 180px;
    }
}


/* 乘方的乘方：整數連乘與倒數指數分岔 */
.ka-power-guide {
    margin-top: 22px;
    padding: 22px;
    border: 1px solid #d7c79f;
    border-radius: var(--radius);
    background: #fffdf8;
    box-shadow: 0 9px 28px rgba(16,42,67,.06);
}

.ka-power-guide h3 {
    margin: 0;
    color: var(--navy-2);
    font-size: 1.25rem;
}

.ka-power-case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ka-root-case-card {
    border-color: #b8d4cf !important;
    background: #f4fbf9 !important;
}

.ka-power-bridge {
    margin-top: 16px;
    padding: 14px 18px;
    border-left: 5px solid var(--amber);
    border-radius: 0 14px 14px 0;
    color: #4f493c;
    text-align: center;
    background: var(--amber-soft);
}

.ka-power-bridge p {
    margin: 4px 0 0;
}

body.eye-mode .ka-power-guide,
body.eye-mode .ka-root-case-card {
    background: #f4efdf !important;
}

@media (max-width: 920px) {
    .ka-power-case-grid {
        grid-template-columns: 1fr;
    }
}

@media print {
    .ka-power-guide {
        break-inside: avoid;
        box-shadow: none;
    }
}