css/base.css

:root {
    --bg: #f4efe5;
    --bg-accent: #e5f0e8;
    --panel: rgba(255, 252, 245, 0.92);
    --panel-strong: rgba(255, 248, 234, 0.98);
    --text: #17211d;
    --muted: #51615b;
    --line: rgba(23, 33, 29, 0.12);
    --brand: #0d8f71;
    --brand-soft: rgba(13, 143, 113, 0.14);
    --accent: #ef8354;
    --shadow: 0 18px 60px rgba(20, 30, 28, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100vh;
    overflow: hidden;
    font-family: "IBM Plex Sans", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(239, 131, 84, 0.2), transparent 28%),
        radial-gradient(circle at top right, rgba(13, 143, 113, 0.18), transparent 24%),
        linear-gradient(135deg, var(--bg) 0%, var(--bg-accent) 100%);
}

.page-shell {
    display: grid;
    grid-template-columns: minmax(300px, 360px) 1fr;
    gap: 20px;
    padding: 24px;
    height: 100vh;
    min-height: 0;
}

.control-rail,
.content-pane {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 0;
}

.control-rail {
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 4px;
}

.content-pane {
    overflow: hidden;
}

.hero-card,
.panel-card,
.canvas-card {
    border: 1px solid var(--line);
    background: var(--panel);
    backdrop-filter: blur(14px);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.hero-card {
    padding: 14px 18px;
    background: linear-gradient(160deg, rgba(255, 252, 245, 0.98), rgba(245, 255, 250, 0.94));
}

.panel-card {
    padding: 20px;
}

.canvas-card {
    padding: 22px;
    min-height: 0;
}

.eyebrow {
    margin: 0 0 4px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--brand);
}

h1,
h2 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
}

h1 {
    font-size: clamp(1.35rem, 2vw, 1.8rem);
    line-height: 1.05;
}

h2 {
    font-size: 1.3rem;
}

.muted {
    color: var(--muted);
}

.hero-card .muted {
    margin: 4px 0 0;
    font-size: 0.88rem;
    line-height: 1.25;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--muted);
    text-decoration: none;
    transition: color 160ms ease;
}

.github-link:hover {
    color: var(--brand);
}

.github-link svg {
    flex-shrink: 0;
}

/* ── Mobile layout ────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    body {
        height: auto;
        min-height: 100vh;
        overflow: auto;
    }

    .page-shell {
        grid-template-columns: 1fr;
        height: auto;
        min-height: 0;
        padding: 12px;
        gap: 12px;
        overflow: visible;
    }

    .control-rail,
    .content-pane {
        overflow: visible;
        gap: 12px;
    }

    .canvas-card {
        padding: 14px;
    }

    .panel-card {
        padding: 14px;
    }
}