/* ============================================================
   SHARED SHELL FOR THE DIGITAL MBA DOMAIN MODULES
   ------------------------------------------------------------
   The 128 tools in the free library are independently authored
   and each carries its own inline <style>. This set is different:
   seven modules built together as one set, for one programme,
   with one layout. Duplicating the shell seven times would mean
   seven places to fix a focus ring.

   Each module still sets its own accent by overriding --mba-accent
   in a short inline block — that is the only thing that varies,
   and it is what keeps them recognisable as siblings rather than
   identical.
   ============================================================ */

:root { color-scheme: dark; }

body {
    min-height: 100vh;
    padding: calc(var(--chrome-h, 72px) + 24px) 24px 64px;
    background:
        radial-gradient(circle at 18% 0%, color-mix(in srgb, var(--mba-accent) 14%, transparent), transparent 34rem),
        radial-gradient(circle at 82% 14%, rgba(91, 200, 255, .06), transparent 30rem),
        var(--bg-base);
    font-family: var(--font-sans);
    color: var(--text-primary);
    overflow-x: hidden;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    background: var(--primary-color, #3D8BFF);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--radius-sm, 6px);
    z-index: 200;
    font-size: 14px;
    text-decoration: none;
    transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 8px; }

.top-chrome {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--bg-base) 85%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
}
.site-nav-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: var(--fw-semibold);
    font-size: 16px;
    letter-spacing: var(--tracking-snug);
    color: var(--text-primary);
    text-decoration: none;
}
.back-link {
    font: var(--fw-medium) 13px/1 var(--font-sans);
    color: var(--text-secondary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color var(--dur-fast) var(--ease-out);
}
.back-link:hover { color: var(--text-accent); }

.app-container {
    max-width: 1180px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.hero { text-align: center; padding: 32px 0 0; }
.eyebrow {
    color: var(--mba-accent);
    font: var(--fw-semibold) 13px/1 var(--font-sans);
    letter-spacing: .14em;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.app-title {
    font-size: clamp(2.2rem, 5.5vw, 4.2rem);
    font-weight: var(--fw-medium);
    letter-spacing: var(--tracking-tight);
    line-height: 1.05;
    margin: var(--space-2) 0 var(--space-4);
    background: linear-gradient(135deg, var(--text-primary) 20%, var(--text-secondary) 50%, var(--mba-accent) 82%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-lead {
    font-size: clamp(1.05rem, 1.8vw, 1.25rem);
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 780px;
    margin: 0 auto;
}
.hero-lead strong { color: var(--text-primary); font-weight: var(--fw-semibold); }

.shell {
    background: var(--surface-1);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg, 16px);
    padding: clamp(16px, 2.5vw, 28px);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}
.shell-topbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}
.shell-title {
    font-size: 1.1rem;
    font-weight: var(--fw-semibold);
    letter-spacing: var(--tracking-snug);
}
.shell-title span { color: var(--text-tertiary); font-weight: var(--fw-regular); }

.tool-btn {
    border: 1px solid var(--border-default);
    background: var(--surface-2);
    color: var(--text-primary);
    font: var(--fw-semibold) 14px/1 var(--font-sans);
    padding: 11px 20px;
    border-radius: var(--radius-full, 999px);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--dur-fast) var(--ease-out);
}
.tool-btn:hover:not(:disabled) { border-color: var(--text-tertiary); transform: translateY(-1px); }
.tool-btn:disabled { opacity: .45; cursor: default; transform: none; }
.tool-btn.accent {
    background: var(--mba-accent);
    border-color: var(--mba-accent);
    color: var(--mba-accent-ink, #05121c);
    box-shadow: 0 2px 14px color-mix(in srgb, var(--mba-accent) 30%, transparent);
}
.tool-btn.accent:hover:not(:disabled) { filter: brightness(1.1); }

/* ---- Guess-first panel ---- */
.guess-claim {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    line-height: 1.55;
    max-width: 880px;
}
.guess-claim strong { color: var(--mba-accent); }
.answer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: var(--space-2);
}
.answer-btn {
    border: 1px solid var(--border-default);
    background: var(--surface-3);
    color: var(--text-primary);
    border-radius: var(--radius-md, 12px);
    padding: 18px 16px;
    text-align: left;
    cursor: pointer;
    transition: all var(--dur-fast) var(--ease-out);
    font: var(--fw-medium) 14.5px/1.45 var(--font-sans);
}
.answer-btn:hover:not(:disabled) { border-color: var(--mba-accent); transform: translateY(-2px); }
.answer-btn:disabled { cursor: default; }
.answer-btn.correct { border-color: rgba(47,191,113,.8); background: rgba(47,191,113,.12); }
.answer-btn.wrong { border-color: rgba(255,93,93,.8); background: rgba(255,93,93,.1); }
.guess-feedback {
    border-left: 3px solid var(--mba-accent);
    background: var(--surface-3);
    border-radius: 0 var(--radius-md, 12px) var(--radius-md, 12px) 0;
    padding: 16px 20px;
    font-size: 14.5px;
    line-height: 1.65;
    color: var(--text-secondary);
}
.guess-feedback strong { color: var(--text-primary); }
.is-hidden { display: none; }

/* ---- Interactive core ---- */
.core-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
    gap: var(--space-4);
    align-items: start;
}
.canvas-wrap {
    border-radius: var(--radius-md, 12px);
    border: 1px solid var(--border-subtle);
    background: #080d16;
    padding: 14px;
}
.canvas-wrap svg { display: block; width: 100%; height: auto; }

.side-col { display: flex; flex-direction: column; gap: var(--space-4); }

.control-card {
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md, 12px);
    padding: 18px 20px;
}
.control-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 13.5px;
    font-weight: var(--fw-semibold);
    margin-bottom: 3px;
    gap: 10px;
}
.control-value { font: 700 1rem/1 var(--font-mono, monospace); color: var(--mba-accent); }
.control-sub { font-size: 12px; color: var(--text-tertiary); margin-bottom: 12px; line-height: 1.5; }
input[type="range"] { width: 100%; accent-color: var(--mba-accent); cursor: pointer; }

.verdict-card {
    background: var(--surface-2);
    border: 1px solid color-mix(in srgb, var(--mba-accent) 38%, transparent);
    border-radius: var(--radius-md, 12px);
    padding: 20px;
}
.verdict-kicker {
    font: var(--fw-semibold) 11px/1 var(--font-sans);
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--mba-accent);
    margin-bottom: 8px;
}
.verdict-value {
    font: 700 clamp(1.5rem, 3vw, 2.1rem)/1.15 var(--font-sans);
    color: var(--text-primary);
    margin-bottom: 8px;
}
.verdict-value.is-alarm { color: #ff7b7b; }
.verdict-note { font-size: 13.5px; color: var(--text-secondary); line-height: 1.6; }
.verdict-note strong { color: var(--text-primary); }

.preset-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.preset-btn {
    border: 1px solid var(--border-default);
    background: var(--surface-2);
    color: var(--text-secondary);
    font: var(--fw-medium) 13px/1.3 var(--font-sans);
    padding: 9px 14px;
    border-radius: var(--radius-full, 999px);
    cursor: pointer;
    transition: all var(--dur-fast) var(--ease-out);
}
.preset-btn:hover { border-color: var(--text-tertiary); color: var(--text-primary); }
.preset-btn.active {
    background: color-mix(in srgb, var(--mba-accent) 16%, transparent);
    border-color: color-mix(in srgb, var(--mba-accent) 60%, transparent);
    color: var(--text-primary);
}

/* ---- Data tables and alternatives ---- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font: var(--fw-medium) 13px/1.4 var(--font-mono, monospace);
}
.data-table caption {
    caption-side: top;
    text-align: left;
    font: var(--fw-semibold) 12px/1.4 var(--font-sans);
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    padding-bottom: 8px;
}
.data-table th, .data-table td {
    border-bottom: 1px solid var(--border-subtle);
    padding: 8px 10px;
    text-align: right;
}
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th {
    font: var(--fw-semibold) 12px/1.4 var(--font-sans);
    color: var(--text-tertiary);
}

details.alt-view {
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md, 12px);
    padding: 12px 16px;
    background: var(--surface-2);
}
details.alt-view summary {
    cursor: pointer;
    font: var(--fw-semibold) 13px/1 var(--font-sans);
    color: var(--text-secondary);
}
details.alt-view summary:hover { color: var(--text-primary); }
details.alt-view table { margin-top: 14px; }

/* ---- Where this bites ---- */
.bite-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-3);
}
.bite-card {
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md, 12px);
    padding: 22px;
}
.bite-kicker {
    font: 700 13px/1 var(--font-mono, monospace);
    color: var(--mba-accent);
    margin-bottom: 10px;
}
.bite-card h3 {
    font-size: 1.05rem;
    font-weight: var(--fw-semibold);
    margin: 0 0 8px;
    letter-spacing: var(--tracking-snug);
}
.bite-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin: 0; }
.bite-card p strong { color: var(--text-primary); }

.closing {
    text-align: center;
    max-width: 790px;
    margin: 0 auto;
    font-size: clamp(1rem, 1.6vw, 1.15rem);
    color: var(--text-secondary);
    line-height: 1.75;
}
.closing strong { color: var(--text-primary); }

.page-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-2);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    font-size: 12.5px;
}

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

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}