:root {
    --bg-top: #0d1b22;
    --bg-mid: #12353d;
    --bg-bottom: #efe7d7;
    --panel: rgba(255, 250, 241, 0.84);
    --panel-strong: #fffaf1;
    --stroke: rgba(24, 56, 64, 0.12);
    --ink: #102028;
    --muted: #5b6970;
    --accent: #0f766e;
    --accent-strong: #0b5a54;
    --accent-soft: #d8f1ec;
    --warning: #9a3412;
    --danger: #b42318;
    --shadow: 0 26px 80px rgba(10, 27, 34, 0.16);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --font-body: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-heading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: var(--font-body);
    min-height: 100vh;
}

body.workspace-page {
    background:
        radial-gradient(circle at top right, rgba(216, 241, 236, 0.28), transparent 24%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-mid) 34%, var(--bg-bottom) 100%);
}

body.workspace-page::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), transparent 70%);
    pointer-events: none;
}

.page-shell {
    width: min(1200px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 40px 0 80px;
}

.hero,
.control-card,
.reference-card,
.results-shell,
.saved-shell {
    background: var(--panel);
    backdrop-filter: blur(14px);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
}

.hero {
    display: grid;
    grid-template-columns: 1.6fr 0.9fr;
    gap: 28px;
    padding: 34px;
    border-radius: var(--radius-xl);
}

.hero-copy {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 24px;
}

.eyebrow,
.section-kicker,
.panel-label {
    margin: 0 0 14px;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-strong);
}

.hero h1,
.section-heading h2,
.saved-shell h2,
.control-card h2,
.reference-card h2,
.results-shell h2 {
    margin: 0;
    font-family: var(--font-heading);
    line-height: 1.1;
}

.hero h1 {
    font-size: clamp(2.6rem, 5vw, 4.5rem);
    max-width: 10ch;
}

.result-note,
.constraint-list p,
.save-hint,
.saved-meta {
    color: var(--muted);
    line-height: 1.7;
}

.hero-actions,
.form-actions,
.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

button,
.hero-link-button {
    font: inherit;
    cursor: pointer;
}

button:disabled {
    opacity: 0.58;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.hero-button,
.form-actions button,
.save-actions button,
.danger-button,
.saved-load,
.saved-toggle,
.hero-link-button {
    border: none;
    border-radius: 999px;
    padding: 13px 18px;
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.hero-button:hover,
.form-actions button:hover,
.save-actions button:hover,
.danger-button:hover,
.saved-load:hover,
.saved-toggle:hover,
.hero-link-button:hover {
    transform: translateY(-1px);
}

.primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
    color: #f4fffd;
    box-shadow: 0 10px 30px rgba(15, 118, 110, 0.28);
}

.secondary {
    background: rgba(15, 118, 110, 0.08);
    color: var(--accent-strong);
}

.danger-button {
    background: rgba(180, 35, 24, 0.1);
    color: var(--danger);
}

.hero-panel {
    padding: 24px;
    border-radius: calc(var(--radius-xl) - 8px);
    background: linear-gradient(180deg, rgba(17, 42, 48, 0.96) 0%, rgba(28, 72, 82, 0.94) 100%);
    color: #eaf8f4;
}

.hero-version-line {
    display: grid;
    gap: 6px;
    margin-bottom: 18px;
}

.hero-version-line strong {
    font-size: 1.7rem;
    font-family: var(--font-heading);
}

.hero-version-line span {
    color: rgba(234, 248, 244, 0.76);
}

.metric-preview {
    list-style: none;
    padding: 0;
    margin: 18px 0 0;
    display: grid;
    gap: 16px;
}

.metric-preview li {
    display: grid;
    gap: 6px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.metric-preview li:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.metric-preview span {
    color: rgba(234, 248, 244, 0.72);
}

.content-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 24px;
    margin-top: 24px;
}

.control-card,
.reference-card,
.results-shell,
.saved-shell {
    border-radius: var(--radius-xl);
    padding: 28px;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 20px;
    margin-bottom: 20px;
}

.section-heading.compact {
    margin-bottom: 16px;
}

.pill {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--accent-strong);
}

.status-banner {
    margin: 0 0 20px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    background: rgba(16, 32, 40, 0.06);
    color: var(--ink);
}

.status-banner[data-tone="loading"] {
    background: rgba(15, 118, 110, 0.1);
    color: var(--accent-strong);
}

.status-banner[data-tone="warning"] {
    background: rgba(154, 52, 18, 0.1);
    color: var(--warning);
}

.status-banner[data-tone="error"] {
    background: rgba(180, 35, 24, 0.1);
    color: var(--danger);
}

.status-banner[data-tone="success"] {
    background: var(--accent-soft);
    color: var(--accent-strong);
}

.control-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.control-form label,
.note-field {
    display: grid;
    gap: 8px;
}

.control-form span,
.note-field span {
    font-size: 1rem;
    font-weight: 700;
}

.control-form small {
    color: var(--muted);
    min-height: 2.8em;
    line-height: 1.45;
}

.control-form input,
.control-form select,
.note-field textarea,
.saved-note-input {
    width: 100%;
    border: 1px solid rgba(16, 32, 40, 0.12);
    border-radius: 14px;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.74);
    color: var(--ink);
    font: inherit;
}

.control-form input,
.control-form select {
    min-height: 56px;
}

.saved-note-input {
    min-height: 40px;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.84);
}

.note-field textarea {
    min-height: 112px;
    resize: vertical;
}

.control-form input:focus,
.control-form select:focus,
.note-field textarea:focus,
.saved-note-input:focus {
    outline: 2px solid rgba(15, 118, 110, 0.2);
    border-color: rgba(15, 118, 110, 0.45);
}

.saved-note-input[data-saving="true"] {
    background: rgba(216, 241, 236, 0.5);
}

.form-actions {
    grid-column: 1 / -1;
    margin-top: 8px;
}

.constraint-list,
.saved-results-list {
    display: grid;
    gap: 16px;
}

.constraint-list article,
.saved-card,
.summary-card,
.detail-paper,
.save-shell {
    border-radius: var(--radius-lg);
    border: 1px solid rgba(16, 32, 40, 0.08);
    background: rgba(255, 255, 255, 0.56);
}

.constraint-list article,
.detail-paper,
.save-shell,
.saved-card {
    padding: 18px;
}

.constraint-list h3,
.saved-card h3 {
    margin: 0 0 10px;
    font-family: var(--font-heading);
    font-size: 1.2rem;
}

.results-shell,
.saved-shell {
    margin-top: 24px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.summary-card {
    padding: 18px;
    min-height: 136px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.summary-card.accent {
    background: linear-gradient(180deg, rgba(15, 118, 110, 0.94) 0%, rgba(11, 90, 84, 0.96) 100%);
    color: #effcf9;
}

.summary-card p {
    margin: 0;
    color: inherit;
    opacity: 0.82;
}

.summary-card strong {
    font-size: clamp(1.65rem, 3vw, 2.3rem);
    line-height: 1;
}

.details-shell,
.save-shell {
    margin-top: 24px;
}

.detail-table {
    width: 100%;
    border-collapse: collapse;
}

.detail-table th,
.detail-table td {
    padding: 12px 10px;
    border-bottom: 1px solid rgba(16, 32, 40, 0.12);
}

.detail-table tr:first-child th,
.detail-table tr:first-child td {
    border-top: 2px solid rgba(16, 32, 40, 0.5);
}

.detail-table tr:last-child th,
.detail-table tr:last-child td {
    border-bottom: 2px solid rgba(16, 32, 40, 0.5);
}

.detail-table th {
    width: 42%;
    color: var(--muted);
    text-align: left;
    font-family: var(--font-heading);
    font-size: 1.08rem;
    font-weight: 600;
}

.detail-table td {
    text-align: right;
    font-size: 1.14rem;
    font-weight: 700;
}

.detail-table.compact th,
.detail-table.compact td {
    padding: 10px 8px;
    font-size: 0.98rem;
}

.saved-card {
    padding: 12px;
    overflow-x: clip;
}

.saved-card-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 8px;
}

.saved-card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
}

.saved-card-actions button {
    width: 104px;
    min-width: 104px;
    height: 52px;
    padding: 0 14px;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1;
    white-space: nowrap;
    box-shadow: none;
}

.saved-load {
    background: rgba(15, 118, 110, 0.12);
    color: var(--accent-strong);
}

.saved-toggle {
    background: rgba(15, 118, 110, 0.08);
    color: var(--accent-strong);
}

.saved-toggle .saved-toggle-open {
    display: none;
}

.saved-toggle[aria-expanded="true"] .saved-toggle-open {
    display: inline;
}

.saved-toggle[aria-expanded="true"] .saved-toggle-closed {
    display: none;
}

.saved-compact-shell {
    width: 100%;
    overflow-x: auto;
}

.saved-compact-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.saved-compact-table th,
.saved-compact-table td {
    padding: 10px 8px;
    text-align: left;
    border-bottom: 1px solid rgba(16, 32, 40, 0.1);
}

.saved-compact-table th {
    color: var(--muted);
    font-weight: 600;
}

.saved-compact-table td {
    font-weight: 700;
}

.saved-expanded-wrap {
    margin-top: 10px;
}

.saved-empty {
    padding: 18px;
    border-radius: var(--radius-lg);
    border: 1px dashed rgba(16, 32, 40, 0.14);
    background: rgba(255, 255, 255, 0.46);
    color: var(--muted);
}

body.landing-body {
    background:
        radial-gradient(circle at 18% 18%, rgba(216, 241, 236, 0.2), transparent 22%),
        radial-gradient(circle at 84% 12%, rgba(255, 216, 153, 0.18), transparent 24%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-mid) 40%, #efe2cc 100%);
    overflow-x: hidden;
}

body.landing-body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.38), transparent 74%);
}

.landing-shell {
    position: relative;
    width: min(1200px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 48px 0 88px;
}

.landing-hero,
.version-card {
    background: var(--panel);
    backdrop-filter: blur(14px);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
}

.landing-hero {
    display: grid;
    grid-template-columns: 1.5fr 0.9fr;
    gap: 28px;
    padding: 36px;
    border-radius: var(--radius-xl);
}

.landing-copy {
    display: grid;
    gap: 18px;
}

.landing-hero h1,
.version-card h2 {
    margin: 0;
    font-family: var(--font-heading);
}

.landing-hero h1 {
    font-size: clamp(2.8rem, 5vw, 4.8rem);
    max-width: 10ch;
}

.landing-orbit {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
}

.orbit-ring {
    position: absolute;
    border-radius: 999px;
    border: 1px solid rgba(16, 32, 42, 0.12);
}

.orbit-ring-lg {
    width: 300px;
    height: 300px;
}

.orbit-ring-sm {
    width: 200px;
    height: 200px;
    border-style: dashed;
}

.orbit-core {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    gap: 10px;
    background: radial-gradient(circle at top, rgba(255, 255, 255, 0.96), rgba(221, 243, 239, 0.86));
    box-shadow: 0 18px 40px rgba(11, 91, 86, 0.18);
    font-family: var(--font-heading);
    font-size: 1.8rem;
}

.version-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.version-card {
    display: grid;
    gap: 16px;
    padding: 28px;
    border-radius: var(--radius-xl);
    color: var(--ink);
    text-decoration: none;
    transition: transform 180ms ease, box-shadow 180ms ease;
}

.version-card:hover {
    transform: translateY(-4px);
}

.version-card-top,
.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.version-badge,
.hero-badges span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--accent-strong);
}

.version-card-v1 {
    background: linear-gradient(180deg, rgba(255, 250, 241, 0.9) 0%, rgba(223, 243, 236, 0.9) 100%);
}

.version-card-v2 {
    background: linear-gradient(180deg, rgba(255, 250, 241, 0.92) 0%, rgba(244, 232, 206, 0.94) 100%);
}

.version-card ul {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
    line-height: 1.8;
}

.card-cta {
    color: var(--accent-strong);
    font-weight: 700;
}

@media (max-width: 980px) {
    .hero,
    .content-grid,
    .summary-grid,
    .version-grid,
    .landing-hero {
        grid-template-columns: 1fr;
    }

    .page-shell,
    .landing-shell {
        width: min(100vw - 20px, 1200px);
        padding-top: 24px;
    }
}

@media (max-width: 720px) {
    .hero,
    .control-card,
    .reference-card,
    .results-shell,
    .saved-shell,
    .landing-hero,
    .version-card {
        padding: 22px;
    }

    .control-form,
    .summary-grid {
        grid-template-columns: 1fr;
    }

    .hero h1,
    .landing-hero h1 {
        font-size: 2.35rem;
    }

    .saved-card-toolbar,
    .section-heading {
        flex-direction: column;
    }
}

/* Simple Landing Page */
body.simple-landing-body {
    position: relative;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 18% 18%, rgba(248, 214, 145, 0.24), transparent 26%),
        radial-gradient(circle at 82% 14%, rgba(130, 202, 188, 0.2), transparent 24%),
        linear-gradient(180deg, #0e1d24 0%, #18363e 40%, #ebe3d6 100%);
    min-height: 100vh;
}

body.simple-landing-body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.42), transparent 78%);
    pointer-events: none;
}

.simple-floating {
    position: fixed;
    border-radius: 999px;
    pointer-events: none;
    filter: blur(14px);
    opacity: 0.55;
}

.simple-floating-a {
    width: 360px;
    height: 360px;
    top: -100px;
    right: -80px;
    background: radial-gradient(circle, rgba(255, 246, 228, 0.52), rgba(255, 246, 228, 0));
}

.simple-floating-b {
    width: 300px;
    height: 300px;
    left: -110px;
    bottom: 30px;
    background: radial-gradient(circle, rgba(119, 182, 169, 0.28), rgba(119, 182, 169, 0));
}

.simple-landing-shell {
    position: relative;
    z-index: 1;
    width: min(1120px, calc(100vw - 40px));
    margin: 0 auto;
    padding: 54px 0 78px;
}

.simple-title-card,
.simple-version-card {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(17, 24, 39, 0.12);
    background: linear-gradient(180deg, rgba(255, 251, 244, 0.97), rgba(247, 240, 229, 0.92));
    box-shadow: 0 32px 80px rgba(9, 24, 31, 0.16);
}

.simple-title-card::before,
.simple-version-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.48), transparent 54%);
    pointer-events: none;
}

.simple-title-card {
    min-height: 286px;
    border-radius: 44px;
    padding: 38px 42px;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) 220px;
    gap: 28px;
    align-items: center;
}

.simple-title-copy {
    position: relative;
    z-index: 1;
}

.simple-kicker {
    margin: 0 0 18px;
    color: #0b5a54;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-size: 0.82rem;
    font-weight: 700;
}

.simple-title-card h1 {
    margin: 0;
    color: #11212a;
    font-family: var(--font-heading);
    font-size: clamp(2.8rem, 5.8vw, 5.3rem);
    line-height: 1.06;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.simple-subtitle {
    margin: 18px 0 0;
    max-width: 30ch;
    color: #4d6268;
    font-size: 1.08rem;
    line-height: 1.7;
}

.simple-title-art {
    position: relative;
    height: 100%;
    min-height: 190px;
}

.simple-title-art span {
    position: absolute;
    border-radius: 999px;
    border: 1px solid rgba(11, 90, 84, 0.18);
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.62), rgba(15, 118, 110, 0.08));
}

.simple-title-art span:nth-child(1) {
    width: 190px;
    height: 190px;
    right: 8px;
    top: 0;
}

.simple-title-art span:nth-child(2) {
    width: 118px;
    height: 118px;
    left: 6px;
    bottom: 14px;
}

.simple-title-art span:nth-child(3) {
    width: 54px;
    height: 54px;
    right: 28px;
    bottom: 10px;
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.9), rgba(11, 90, 84, 0.7));
    border: none;
}

.simple-version-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.simple-version-card {
    min-height: 320px;
    padding: 32px 34px 36px;
    color: #12232c;
    text-decoration: none;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.simple-version-card-v1 {
    border-radius: 46px 36px 34px 40px;
}

.simple-version-card-v2 {
    border-radius: 36px 46px 40px 34px;
}

.simple-version-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 36px 86px rgba(10, 27, 34, 0.21);
    border-color: rgba(15, 118, 110, 0.26);
}

.simple-card-head {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 30px;
}

.simple-card-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 56px;
    height: 34px;
    padding: 0 14px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.1);
    color: #0b5a54;
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.simple-version-card h2 {
    margin: 0;
    font-size: clamp(2.15rem, 4vw, 3.12rem);
    line-height: 1;
    font-weight: 600;
    text-transform: lowercase;
}

.simple-card-lines {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 16px;
}

.simple-card-lines p {
    display: grid;
    grid-template-columns: 46px 1fr;
    align-items: start;
    gap: 12px;
    margin: 0;
    font-size: clamp(1.18rem, 1.9vw, 1.72rem);
    line-height: 1.48;
    color: #1a2d37;
}

.simple-card-lines span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 999px;
    background: #10373a;
    color: #f4faf8;
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

@media (max-width: 900px) {
    .simple-title-card {
        grid-template-columns: 1fr;
    }

    .simple-title-art {
        min-height: 140px;
    }
}

@media (max-width: 780px) {
    .simple-landing-shell {
        width: min(100vw - 24px, 720px);
        padding: 28px 0 40px;
    }

    .simple-title-card {
        min-height: 220px;
        padding: 26px 22px;
        border-radius: 28px;
        gap: 18px;
    }

    .simple-version-grid {
        grid-template-columns: 1fr;
        gap: 18px;
        margin-top: 18px;
    }

    .simple-version-card,
    .simple-version-card-v1,
    .simple-version-card-v2 {
        min-height: auto;
        border-radius: 28px;
        padding: 24px 22px;
    }

    .simple-card-lines p {
        grid-template-columns: 40px 1fr;
        gap: 10px;
    }

    .simple-card-lines span {
        width: 34px;
        height: 34px;
    }
}