/* Once Upon a Model — shared base theme
   Loaded by every lesson page. Defines the common look (background, cards,
   nav, footer, buttons, headings). Each page keeps its own small <style>
   block on top of this for its accent color (--accent/--accent-dark/
   --accent-light) and any widgets unique to that lesson. */

:root {
    --bg: #faf6f0;
    --surface: #ffffff;
    --border: #dcd1c4;
    --text: #2b221a;
    --text-muted: #6b5a4c;
    --text-faint: #a49382;

    /* Default accent — pages override these three to get their own
       "personality" color while everything else stays consistent. */
    --accent: #d97706;
    --accent-dark: #b45309;
    --accent-light: #fef3e2;

    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(43, 34, 26, 0.04);
    --shadow-md: 0 4px 12px rgba(43, 34, 26, 0.06);
    --font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
}

/* ── Nav ── */
.site-nav {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 4px;
    margin-bottom: 8px;
}
.nav-logo {
    font-weight: 800;
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
}
.nav-back {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
}
.nav-back:hover { color: var(--accent-dark); }

/* ── Page container / card ── */
.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 30px;
}

h1 {
    text-align: center;
    color: var(--text);
    margin-top: 0;
}

/* ── Buttons ── */
button.primary {
    background-color: var(--accent-dark);
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    font-family: inherit;
    transition: background 0.2s;
}
button.primary:hover { background-color: var(--accent); }

/* ── Top-nav (breadcrumb style, used on Vol. II+ pages with a hero) ── */
.top-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.top-nav .nav-back {
    color: var(--accent-dark);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.top-nav .nav-back:hover { color: var(--accent); }
.nav-sep { color: var(--text-faint); }
.nav-title { font-size: 0.85rem; color: var(--text-muted); }

/* ── Hero (Vol. II+ page header banner) ── */
.hero {
    background: var(--accent-light);
    border-bottom: 4px solid var(--accent);
    padding: 48px 40px 40px;
    text-align: center;
}
.hero-tag {
    display: inline-block;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--accent-dark);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}
.hero h1 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 900;
    color: var(--text);
    margin: 0 0 12px;
    line-height: 1.2;
}
.hero h1 span { color: var(--accent-dark); }
.hero p {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 620px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ── Footer ── */
footer.site-footer {
    max-width: 900px;
    margin: 48px auto 0;
    padding: 20px 16px;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-faint);
    border-top: 1px solid var(--border);
}
footer.site-footer a {
    color: inherit;
    text-decoration: underline;
}