:root {
    --bg: #f4efe5;
    --bg-alt: #efe6d8;
    --surface: rgba(255, 252, 246, 0.9);
    --surface-strong: #fffdf9;
    --text: #1d1a16;
    --muted: #63594c;
    --line: rgba(75, 57, 39, 0.14);
    --accent: #c75b2b;
    --accent-strong: #8e3715;
    --accent-soft: #f0c59f;
    --shadow: 0 20px 60px rgba(72, 41, 17, 0.12);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --max: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Space Grotesk", "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(199, 91, 43, 0.18), transparent 32%),
        radial-gradient(circle at right 20%, rgba(53, 111, 84, 0.14), transparent 28%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
    min-height: 100vh;
}

a {
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

.site-shell {
    width: min(calc(100% - 32px), var(--max));
    margin: 0 auto;
    padding: 28px 0 64px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: #fff;
    font-weight: 700;
    box-shadow: var(--shadow);
}

.brand-copy {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.brand-subtitle {
    color: var(--muted);
    font-size: 0.8rem;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.nav-link,
.ghost-link,
.pill-link {
    text-decoration: none;
}

.nav-link,
.pill-link {
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.48);
    backdrop-filter: blur(12px);
}

.nav-link:hover,
.pill-link:hover,
.button:hover,
button:hover {
    transform: translateY(-1px);
}

.hero,
.solver-hero {
    position: relative;
    overflow: hidden;
    padding: 34px;
    border-radius: var(--radius-lg);
    background: linear-gradient(140deg, rgba(255, 252, 246, 0.96), rgba(255, 245, 233, 0.88));
    border: 1px solid rgba(125, 95, 63, 0.14);
    box-shadow: var(--shadow);
}

.hero::after,
.solver-hero::after {
    content: "";
    position: absolute;
    inset: auto -80px -80px auto;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(199, 91, 43, 0.2), transparent 70%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(199, 91, 43, 0.1);
    color: var(--accent-strong);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1,
.solver-hero h1 {
    margin: 16px 0 12px;
    font-size: clamp(2.2rem, 5vw, 4.5rem);
    line-height: 0.95;
    letter-spacing: -0.05em;
}

.hero p,
.solver-hero p,
.section-subtitle,
.solver-copy {
    color: var(--muted);
    font-size: 1.02rem;
    line-height: 1.65;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.button,
button {
    appearance: none;
    border: 0;
    border-radius: 14px;
    padding: 12px 18px;
    font: inherit;
    cursor: pointer;
    transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.button-primary,
#solveButton,
#graphItButton,
#saveButton1,
#saveButton2,
#saveButton3,
#restoreButton1,
#restoreButton2,
#restoreButton3 {
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: #fff;
    box-shadow: 0 14px 30px rgba(142, 55, 21, 0.22);
}

#graphItButton:disabled,
button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.button-secondary {
    color: var(--text);
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid var(--line);
}

.hero-visual {
    display: grid;
    gap: 18px;
}

.hero-card,
.stat-card,
.list-card,
.solver-card,
.info-card,
.panel-card,
.footer-card {
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: var(--surface);
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 30px rgba(53, 32, 14, 0.06);
}

.hero-card {
    padding: 18px;
}

.hero-card img {
    width: 100%;
    border-radius: 16px;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.hero-card p {
    margin: 14px 0 0;
    font-size: 0.95rem;
}

.stats-grid,
.cards-grid,
.solver-grid,
.more-grid {
    display: grid;
    gap: 18px;
    margin-top: 28px;
}

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

.stat-card {
    padding: 20px;
}

.stat-label {
    color: var(--muted);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-value {
    margin-top: 10px;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 16px;
    margin: 40px 0 18px;
}

.section-heading h2,
.section-heading h3,
.section-heading p {
    margin: 0;
}

.section-heading h2,
.section-heading h3 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    letter-spacing: -0.04em;
}

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

.list-card {
    padding: 22px;
}

.card-tag {
    display: inline-block;
    padding: 7px 11px;
    border-radius: 999px;
    background: rgba(53, 111, 84, 0.1);
    color: #27553d;
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.list-card h3 {
    margin: 14px 0 10px;
    font-size: 1.35rem;
}

.list-card p {
    margin: 0 0 18px;
    color: var(--muted);
    line-height: 1.6;
}

.link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.link-row a {
    color: var(--accent-strong);
    font-weight: 700;
    text-decoration: none;
}

.stack-list {
    display: grid;
    gap: 12px;
}

.stack-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid rgba(75, 57, 39, 0.1);
    background: rgba(255, 255, 255, 0.58);
    text-decoration: none;
}

.stack-list small,
.muted {
    color: var(--muted);
}

.solver-hero {
    margin-bottom: 24px;
}

.solver-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    align-items: start;
}

.solver-card,
.panel-card,
.info-card,
.footer-card {
    padding: 24px;
}

.panel-title {
    margin: 0 0 10px;
    font-size: 1.15rem;
}

.control-row {
    display: grid;
    gap: 14px;
}

.save-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

label,
.field-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--muted);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

select,
textarea,
input[type="text"] {
    width: 100%;
    border: 1px solid rgba(75, 57, 39, 0.15);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.78);
    color: var(--text);
    font: inherit;
}

select,
input[type="text"] {
    min-height: 50px;
    padding: 0 16px;
}

textarea {
    min-height: 280px;
    padding: 16px;
    resize: vertical;
    font-family: "IBM Plex Mono", "Consolas", monospace;
    line-height: 1.45;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.solver-actions {
    margin-top: 16px;
}

.solver-note {
    margin-top: 12px;
    font-size: 0.92rem;
    color: var(--muted);
}

.feature-list {
    display: grid;
    gap: 12px;
    margin: 18px 0 0;
}

.feature-item {
    padding: 14px 16px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(75, 57, 39, 0.09);
}

.feature-item strong {
    display: block;
    margin-bottom: 4px;
}

.footer-card {
    margin-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
}

.github-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    padding: 12px 16px;
    border-radius: 999px;
    background: rgba(29, 26, 22, 0.92);
    color: #fff;
}

.weather-card img {
    width: auto;
    max-width: 100%;
}

.accent {
    color: var(--accent-strong);
}

.tiny {
    font-size: 0.88rem;
}

.mono {
    font-family: "IBM Plex Mono", "Consolas", monospace;
}

@media (max-width: 980px) {
    .hero-grid,
    .solver-grid,
    .stats-grid,
    .cards-grid,
    .more-grid {
        grid-template-columns: 1fr;
    }

    .section-heading,
    .topbar,
    .footer-card {
        align-items: start;
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .site-shell {
        width: min(calc(100% - 20px), var(--max));
        padding-top: 18px;
        padding-bottom: 40px;
    }

    .hero,
    .solver-hero,
    .solver-card,
    .panel-card,
    .info-card,
    .footer-card,
    .list-card {
        padding: 20px;
        border-radius: 22px;
    }

    .hero h1,
    .solver-hero h1 {
        font-size: 2.25rem;
    }

    .save-grid,
    .button-row,
    .hero-actions,
    .nav-links {
        width: 100%;
    }

    .save-grid button,
    .button-row button,
    .hero-actions a,
    .nav-links a {
        flex: 1 1 auto;
        text-align: center;
    }
}