:root {
    color-scheme: light;
    --ink: #17130f;
    --ink-soft: #4c443a;
    --paper: #f8f5ee;
    --paper-deep: #eee6d7;
    --line: rgba(23, 19, 15, 0.14);
    --cinnabar: #a93624;
    --jade: #1f6f61;
    --gold: #b8862c;
    --shadow: 0 18px 54px rgba(23, 19, 15, 0.13);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background:
        radial-gradient(circle at 16% 8%, rgba(184, 134, 44, 0.16), transparent 30rem),
        linear-gradient(135deg, #efe8db 0%, #f8f5ee 44%, #e7eee9 100%);
}

body {
    min-height: 100%;
    margin: 0;
    color: var(--ink);
    font-family: ui-serif, "Songti TC", "Noto Serif TC", "PingFang TC", serif;
    line-height: 1.6;
}

button,
input {
    font: inherit;
}

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

.app-shell {
    width: min(100%, 980px);
    margin: 0 auto;
    padding: max(18px, env(safe-area-inset-top)) 18px max(32px, env(safe-area-inset-bottom));
}

.app-header {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px 56px 18px;
}

.brand-lockup {
    display: inline-grid;
    grid-template-columns: auto auto;
    gap: 14px;
    align-items: center;
    justify-content: center;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border: 1px solid rgba(23, 19, 15, 0.16);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.42);
    box-shadow: 0 10px 28px rgba(23, 19, 15, 0.11);
}

.brand-mark img {
    width: 42px;
    height: 42px;
    object-fit: contain;
}

.eyebrow {
    margin: 0 0 2px;
    color: var(--cinnabar);
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0;
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(2.3rem, 9vw, 4.4rem);
    line-height: 0.95;
    font-weight: 800;
}

h2 {
    margin-bottom: 0;
    font-size: clamp(1.2rem, 4.8vw, 1.8rem);
    line-height: 1.22;
}

.icon-button {
    display: inline-grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.48);
    color: var(--ink);
    cursor: pointer;
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-weight: 800;
}

.app-header > .icon-button {
    position: absolute;
    right: 0;
}

.icon-button:focus-visible,
.button:focus-visible {
    outline: 3px solid rgba(184, 134, 44, 0.42);
    outline-offset: 2px;
}

.question-panel,
.reading-panel,
.interpretation-panel,
.hexagram-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 252, 246, 0.78);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.question-panel,
.reading-panel,
.interpretation-panel {
    padding: 20px;
}

.section-heading {
    margin-bottom: 18px;
}

.field-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
    gap: 12px;
}

.input-group {
    display: grid;
    gap: 7px;
    color: var(--ink-soft);
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
}

.input-group input {
    width: 100%;
    min-height: 48px;
    border: 1px solid rgba(23, 19, 15, 0.18);
    border-radius: 8px;
    outline: none;
    background: rgba(255, 255, 255, 0.72);
    color: var(--ink);
    padding: 12px 13px;
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.input-group input:focus {
    border-color: rgba(31, 111, 97, 0.72);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(31, 111, 97, 0.13);
}

.action-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 18px;
}

.button {
    min-height: 46px;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 10px 18px;
    cursor: pointer;
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-weight: 800;
    transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

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

.button:disabled {
    cursor: wait;
    opacity: 0.54;
}

.button-primary {
    background: var(--ink);
    color: var(--paper);
    box-shadow: 0 10px 22px rgba(23, 19, 15, 0.2);
}

.button-secondary {
    background: var(--cinnabar);
    color: #fff7f2;
    box-shadow: 0 10px 22px rgba(169, 54, 36, 0.22);
}

.button-ghost {
    border-color: var(--line);
    background: rgba(255, 255, 255, 0.48);
    color: var(--ink);
}

.reading-panel {
    margin-top: 14px;
}

.invocation {
    margin-bottom: 0;
    color: var(--ink-soft);
    font-size: clamp(1.05rem, 4.3vw, 1.42rem);
    text-wrap: pretty;
}

.timestamp {
    margin: 10px 0 0;
    color: rgba(76, 68, 58, 0.75);
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-size: 0.85rem;
}

.hexagram-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 14px;
}

.hexagram-card {
    min-height: 318px;
    padding: 18px;
}

.hexagram-card-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--ink-soft);
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-size: 0.92rem;
}

.hexagram-card-header strong {
    color: var(--ink);
    font-family: ui-serif, "Songti TC", "Noto Serif TC", "PingFang TC", serif;
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    line-height: 1;
}

.yao-images {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    min-height: 218px;
}

.yao-line {
    position: relative;
    width: min(68vw, 210px);
    height: 14px;
    border-radius: 999px;
    background: var(--ink);
    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.18);
}

.yao-line.yin {
    background: linear-gradient(to right, var(--ink) 0 43%, transparent 43% 57%, var(--ink) 57% 100%);
}

.yao-line.yang {
    background: var(--ink);
}

.yao-line.yin6 {
    background: linear-gradient(to right, var(--cinnabar) 0 43%, transparent 43% 57%, var(--cinnabar) 57% 100%);
}

.yao-line.yang9 {
    background: var(--cinnabar);
}

.interpretation-panel {
    margin-top: 14px;
}

.interpretation-empty,
.interpretation-text p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 1.05rem;
    text-wrap: pretty;
}

.interpretation-text {
    display: grid;
    gap: 12px;
}

.interpretation-text p {
    padding: 13px 14px;
    border-left: 3px solid var(--gold);
    border-radius: 0 8px 8px 0;
    background: rgba(255, 255, 255, 0.42);
}

.site-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 12px;
    margin-top: 22px;
    color: rgba(76, 68, 58, 0.78);
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
    font-size: 0.88rem;
}

.site-footer a {
    color: var(--jade);
    font-weight: 800;
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

.dialog {
    width: min(calc(100% - 36px), 520px);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0;
    background: var(--paper);
    color: var(--ink);
    box-shadow: var(--shadow);
}

.dialog::backdrop {
    background: rgba(23, 19, 15, 0.42);
    backdrop-filter: blur(4px);
}

.dialog-content {
    padding: 20px;
}

.dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.dialog ul {
    margin: 16px 0 0;
    padding-left: 1.2em;
    color: var(--ink-soft);
}

@media (max-width: 720px) {
    .app-shell {
        padding-inline: 14px;
    }

    .app-header {
        padding-inline: 50px;
    }

    .brand-lockup {
        gap: 12px;
    }

    .field-grid,
    .hexagram-grid {
        grid-template-columns: 1fr;
    }

    .question-panel,
    .reading-panel,
    .interpretation-panel,
    .hexagram-card {
        padding: 16px;
    }

    .action-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .button {
        padding-inline: 10px;
    }
}

@media print {
    html,
    body {
        background: #fff;
    }

    .app-shell {
        width: 100%;
        padding: 0;
    }

    .icon-button,
    .action-row,
    .question-panel {
        display: none;
    }

    .question-panel,
    .reading-panel,
    .interpretation-panel,
    .hexagram-card {
        box-shadow: none;
        break-inside: avoid;
    }
}