:root {
    --bg: #f6f0e5;
    --paper: #fffdf8;
    --paper-strong: #ffffff;
    --ink: #3f3327;
    --muted: #766d63;
    --line: #eadfce;
    --accent: #c26d25;
    --accent-strong: #a44f13;
    --red: #df1717;
    --green: #527b4c;
    --blue: #426f8e;
    --shadow: 0 24px 70px rgba(83, 58, 28, .13);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    background:
        radial-gradient(circle at 88% 9%, rgba(238, 205, 151, .35), transparent 5rem),
        linear-gradient(180deg, #f7f1e7 0%, #fdfbf7 46%, #f5efe4 100%);
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    background:
        linear-gradient(rgba(246, 240, 229, .3), rgba(246, 240, 229, .88)),
        url("data:image/svg+xml,%3Csvg width='1200' height='520' viewBox='0 0 1200 520' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 374c120-64 187-31 285-85 120-67 187-173 313-106 86 46 116 133 219 88 80-35 141-108 235-66 71 32 95 104 148 100v215H0z' fill='%23d9d0bd' fill-opacity='.42'/%3E%3Cpath d='M81 329c80-39 160-33 214-7 83 39 129 23 193-19 87-58 146-79 211-40 71 43 112 84 204 40 115-55 189-18 297 36v181H81z' fill='%23c7bdab' fill-opacity='.26'/%3E%3C/svg%3E") center top / cover no-repeat;
}

a {
    color: inherit;
    text-decoration: none;
}

input,
select,
textarea,
button {
    font: inherit;
}

.app-shell {
    display: grid;
    grid-template-columns: 17rem minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 1.25rem;
    background: rgba(255, 253, 248, .82);
    border-right: 1px solid var(--line);
    backdrop-filter: blur(18px);
}

.brand {
    display: flex;
    gap: .75rem;
    align-items: center;
    margin-bottom: 2rem;
}

.brand-mark,
.tool-icon {
    display: inline-grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    color: var(--accent);
    border: 1.5px solid #edaa64;
    border-radius: .75rem;
    background: #fff8ef;
    box-shadow: inset 0 0 0 4px #fff;
    font-weight: 800;
}

.brand strong {
    display: block;
    font-size: 1.05rem;
}

.brand small,
.tool-card small,
.section-head p,
.hero p,
.muted,
.hint {
    color: var(--muted);
}

.nav-list {
    display: grid;
    gap: .4rem;
}

.nav-list a {
    padding: .75rem .9rem;
    border-radius: .55rem;
    color: var(--muted);
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--accent-strong);
    background: #fff5e8;
}

.sidebar-foot {
    position: absolute;
    right: 1.25rem;
    bottom: 1.25rem;
    left: 1.25rem;
    display: grid;
    gap: .25rem;
    padding: .9rem;
    border: 1px solid var(--line);
    border-radius: .75rem;
    background: #fffaf2;
    font-size: .82rem;
    color: var(--muted);
}

.sidebar-foot strong {
    color: var(--ink);
}

.main {
    width: min(70rem, 100%);
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 26rem);
    gap: 1.5rem;
    align-items: end;
    padding: 1.5rem 0 2rem;
}

.eyebrow {
    margin: 0 0 .55rem;
    color: var(--accent-strong);
    font-size: .82rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    font-family: Georgia, "SimSun", serif;
    font-size: clamp(2.2rem, 6vw, 4rem);
    letter-spacing: 0;
    color: #5b3909;
}

.search-box {
    position: relative;
}

.search-box input {
    width: 100%;
    height: 3.2rem;
    padding: 0 3rem 0 1rem;
    border: 1px solid var(--line);
    border-radius: .75rem;
    outline: none;
    background: rgba(255, 255, 255, .9);
    box-shadow: var(--shadow);
}

.search-box span {
    position: absolute;
    top: .72rem;
    right: 1rem;
    color: var(--accent);
    font-size: 1.35rem;
}

.tool-section {
    margin: 0 0 1.5rem;
    padding: 1.5rem;
    border: 1px solid rgba(234, 223, 206, .72);
    border-radius: .95rem;
    background: rgba(255, 255, 255, .88);
    box-shadow: var(--shadow);
}

.section-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: start;
    margin-bottom: 1.25rem;
}

.section-head h2,
.workspace-head h1,
.panel h2 {
    margin: 0;
    font-family: Georgia, "SimSun", serif;
    letter-spacing: 0;
    color: #5b3909;
}

.section-head p {
    margin: .35rem 0 0;
}

.section-head span {
    padding: .35rem .65rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--accent-strong);
    background: #fff8ef;
    white-space: nowrap;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(8.5rem, 1fr));
    gap: 1rem;
}

.tool-card {
    position: relative;
    display: grid;
    min-height: 9.25rem;
    place-items: center;
    gap: .55rem;
    padding: 1rem .75rem;
    border: 1px solid transparent;
    border-radius: .75rem;
    text-align: center;
    background: #fff;
    transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}

.tool-card:hover {
    transform: translateY(-2px);
    border-color: #edaa64;
    box-shadow: 0 16px 36px rgba(154, 85, 22, .13);
}

.tool-card strong {
    font-size: 1.02rem;
    font-weight: 700;
}

.tool-card small {
    line-height: 1.45;
}

.badge {
    position: absolute;
    top: .65rem;
    right: .65rem;
    min-width: 1.55rem;
    padding: .13rem .32rem;
    border-radius: .35rem;
    color: #fff;
    background: var(--red);
    font-size: .78rem;
    font-weight: 800;
}

.tool-workspace {
    padding-top: 1rem;
}

.workspace-head {
    display: grid;
    grid-template-columns: auto min-content minmax(0, 1fr);
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.25rem;
}

.workspace-head p {
    margin: .3rem 0 0;
    color: var(--muted);
}

.back-link {
    padding: .55rem .8rem;
    border: 1px solid var(--line);
    border-radius: .55rem;
    color: var(--accent-strong);
    background: rgba(255, 255, 255, .72);
}

.workspace-grid {
    display: grid;
    grid-template-columns: minmax(18rem, 24rem) minmax(0, 1fr);
    gap: 1rem;
}

.panel {
    padding: 1.25rem;
    border: 1px solid var(--line);
    border-radius: .85rem;
    background: rgba(255, 255, 255, .92);
    box-shadow: var(--shadow);
}

label {
    display: grid;
    gap: .45rem;
    margin-bottom: .9rem;
    font-weight: 700;
}

input,
select,
textarea {
    width: 100%;
    padding: .72rem .8rem;
    border: 1px solid var(--line);
    border-radius: .55rem;
    outline: none;
    background: #fff;
    color: var(--ink);
    font-weight: 400;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: #edaa64;
    box-shadow: 0 0 0 3px rgba(237, 170, 100, .18);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.7rem;
    padding: 0 1rem;
    border: 1px solid var(--line);
    border-radius: .55rem;
    cursor: pointer;
    background: #fff;
    color: var(--ink);
    font-weight: 800;
}

.button.primary {
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
}

.hint {
    margin: .85rem 0 0;
    font-size: .9rem;
    line-height: 1.6;
}

.result-panel {
    min-height: 18rem;
}

.yao-stack {
    display: grid;
    gap: .85rem;
    max-width: 26rem;
}

.yao-line {
    display: grid;
    grid-template-columns: 9rem 4rem 2rem;
    gap: .8rem;
    align-items: center;
}

.yao-line span {
    height: .72rem;
    border-radius: 99px;
    background: var(--ink);
}

.yao-line span.yin {
    background: linear-gradient(90deg, var(--ink) 0 42%, transparent 42% 58%, var(--ink) 58%);
}

.yao-line em {
    display: inline-grid;
    place-items: center;
    width: 1.8rem;
    height: 1.8rem;
    border-radius: 50%;
    color: #fff;
    background: var(--red);
    font-style: normal;
    font-size: .82rem;
}

.element-list,
.todo-row {
    display: flex;
    flex-wrap: wrap;
    gap: .65rem;
}

.element-pill,
.todo-row span {
    padding: .55rem .75rem;
    border: 1px solid var(--line);
    border-radius: .55rem;
    background: #fffaf2;
    font-weight: 800;
}

.element-木 { color: var(--green); }
.element-火 { color: #b84a2f; }
.element-土 { color: #9b6a21; }
.element-金 { color: #7c6d57; }
.element-水 { color: var(--blue); }

.big-result {
    margin: 1rem 0;
    color: var(--accent-strong);
    font-size: 2rem;
    font-weight: 900;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .8rem;
}

.stat-grid span {
    display: grid;
    gap: .3rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: .75rem;
    background: #fffaf2;
    color: var(--muted);
}

.stat-grid strong {
    color: var(--accent-strong);
    font-size: 1.8rem;
}

pre {
    max-height: 32rem;
    overflow: auto;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: .6rem;
    background: #2f2a25;
    color: #fff6e8;
    line-height: 1.5;
}

.error {
    color: #b42318;
    font-weight: 800;
}

.placeholder-panel {
    line-height: 1.8;
}

.empty-state {
    margin: 6rem auto;
    max-width: 32rem;
    padding: 2rem;
    border-radius: .9rem;
    background: rgba(255, 255, 255, .9);
    text-align: center;
}

.is-hidden {
    display: none;
}

@media (max-width: 860px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        padding: 1rem;
    }

    .nav-list {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .sidebar-foot {
        position: static;
        margin-top: 1rem;
    }

    .main {
        padding: 1rem;
    }

    .hero,
    .workspace-grid {
        grid-template-columns: 1fr;
    }

    .workspace-head {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .nav-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tool-section {
        padding: 1rem;
    }

    .tool-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: .7rem;
    }

    .tool-card {
        min-height: 8.7rem;
    }

    .section-head,
    .stat-grid {
        display: grid;
        grid-template-columns: 1fr;
    }

    .yao-line {
        grid-template-columns: minmax(6rem, 1fr) 3.5rem 2rem;
    }
}