/* =========================================================
   course.css — components for the LLM Fundamentals course
   Loaded AFTER ../style.css; reuses its design tokens.
   Only the course-specific pieces live here so the rest of
   the site keeps a clean base stylesheet.
   ========================================================= */

/* wider measure for the interactive pages (overrides the
   900px cap that style.css gives single-column containers) */
.container.course {
    max-width: 1080px;
}

.page-course .main-col {
    width: 100%;
}

/* ---- module switcher (Architecture / Pre-Training / Post-Training) ---- */
.module-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.module-nav a {
    font-family: var(--sans);
    font-size: 0.9rem;
    color: var(--text);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.module-nav a:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}

.module-nav a.active {
    background: var(--ink);
    color: var(--bg);
    border-color: var(--ink);
}

/* ---- hero ---- */
.course-hero {
    margin: 1.75rem 0 1rem;
}

.course-hero .eyebrow {
    font-family: var(--sans);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.6rem;
}

.course-hero h2 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(2rem, 1.4rem + 3vw, 3.25rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 0 0 0.75rem;
}

.course-hero p {
    font-family: var(--serif);
    font-size: clamp(1.1rem, 1rem + 0.6vw, 1.4rem);
    line-height: 1.5;
    color: var(--text);
    max-width: 60ch;
    margin: 0;
}

/* ---- sticky in-page topic nav ---- */
.topic-strip {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    padding: 0.75rem 0;
    margin: 1.5rem 0 0;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.topic-strip a {
    font-size: 0.8rem;
    color: var(--muted);
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    border: 1px solid transparent;
    white-space: nowrap;
    transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.topic-strip a:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.topic-strip a.active {
    color: var(--ink);
    border-color: var(--border-strong);
    background: var(--surface);
}

/* ---- topic blocks ---- */
.topic {
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border);
    scroll-margin-top: 4.5rem;
}

.topic:first-of-type {
    border-top: none;
}

.topic-head {
    display: flex;
    align-items: baseline;
    gap: 0.9rem;
    margin-bottom: 0.4rem;
}

.topic-num {
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 0.5rem;
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 999px;
}

.topic h3 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.4rem, 1.1rem + 1.2vw, 2rem);
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin: 0;
}

.topic .lead {
    margin: 0.5rem 0 0;
    max-width: 70ch;
}

.topic .note {
    font-size: 0.92rem;
    font-style: italic;
    color: var(--muted);
    max-width: 70ch;
}

.topic strong {
    color: var(--ink);
    font-weight: 600;
}

.topic code {
    font-family: var(--mono);
    font-size: 0.88em;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 0.1em 0.4em;
    border-radius: 5px;
}

/* ---- long-form prose ---- */
.prose {
    max-width: 72ch;
    margin-top: 1.1rem;
}

.prose p {
    margin: 0 0 1rem;
}

.prose p:last-child {
    margin-bottom: 0;
}

.prose h4 {
    font-family: var(--sans);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 1.8rem 0 0.6rem;
}

.prose ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
}

.prose ul li {
    position: relative;
    padding-left: 1.3rem;
    margin: 0.4rem 0;
}

.prose ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ---- key-insight callout ---- */
.callout {
    border-left: 3px solid var(--accent);
    background: var(--accent-soft);
    border-radius: 0 8px 8px 0;
    padding: 0.85rem 1.1rem;
    margin: 1.3rem 0;
    max-width: 72ch;
}

.callout .callout-label {
    display: block;
    font-family: var(--sans);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.35rem;
}

.callout p {
    margin: 0;
    color: var(--ink);
    font-size: 0.97rem;
}

/* ---- definition list ---- */
.deflist {
    margin: 1.2rem 0;
    border-top: 1px solid var(--border);
}

.deflist .row {
    display: grid;
    grid-template-columns: 9rem 1fr;
    gap: 1rem;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--border);
}

.deflist .term {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--accent);
}

.deflist .def {
    font-size: 0.95rem;
    color: var(--text);
}

/* ---- timeline (case studies) ---- */
.timeline {
    margin: 1.4rem 0;
    padding-left: 1.2rem;
    border-left: 2px solid var(--border-strong);
}

.timeline .event {
    position: relative;
    padding: 0 0 1.4rem 1.2rem;
}

.timeline .event::before {
    content: "";
    position: absolute;
    left: calc(-1.2rem - 6px);
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--surface);
    border: 2px solid var(--accent);
}

.timeline .event:last-child {
    padding-bottom: 0;
}

.timeline .when {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--accent);
    text-transform: uppercase;
}

.timeline .what {
    margin: 0.2rem 0 0;
    font-size: 0.97rem;
}

.timeline .what strong {
    color: var(--ink);
}

.casestudy .viz {
    margin-top: 1.6rem;
}

.subhead {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.15rem;
    color: var(--ink);
    margin: 2rem 0 0.4rem;
}

/* ---- visualization shell ---- */
.viz {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: clamp(1rem, 3vw, 1.6rem);
    margin-top: 1.4rem;
}

.viz-title {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.viz-title::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
}

/* ---- controls ---- */
.controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 1rem 1.4rem;
    margin: 0.25rem 0 1.2rem;
}

.control {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-width: 0;
}

.control > label {
    font-family: var(--sans);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

.control output,
.control .val {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--accent);
}

input[type="range"] {
    width: 190px;
    max-width: 60vw;
    accent-color: var(--accent);
    cursor: pointer;
}

.viz input[type="text"],
.viz textarea,
.viz select {
    font-family: var(--sans);
    font-size: 0.95rem;
    color: var(--ink);
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    padding: 0.55rem 0.7rem;
    width: 100%;
    transition: border-color var(--ease);
}

.viz textarea {
    resize: vertical;
    line-height: 1.5;
}

.viz input[type="text"]:focus,
.viz textarea:focus,
.viz select:focus {
    outline: none;
    border-color: var(--accent);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--sans);
    font-size: 0.9rem;
    color: var(--ink);
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    padding: 0.5rem 1.1rem;
    cursor: pointer;
    transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.btn:hover {
    background: var(--ink);
    color: var(--bg);
    border-color: var(--ink);
}

.btn.accent {
    border-color: var(--accent);
    color: var(--accent);
}

.btn.accent:hover {
    background: var(--accent);
    color: #fff;
}

/* ---- toggle pills ---- */
.pill-group {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.pill {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    padding: 0.4rem 0.9rem;
    cursor: pointer;
    transition: all var(--ease);
}

.pill:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.pill.on {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ---- canvas inside viz (reset the about-page absolute rule) ---- */
.viz canvas {
    position: static;
    inset: auto;
    width: 100%;
    height: auto;
    display: block;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: default;
}

/* ---- token chips ---- */
.tokens {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-top: 0.5rem;
}

.token-chip {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--ink);
    background: var(--accent-soft);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.15rem 0.45rem;
    white-space: pre;
}

.token-chip small {
    color: var(--muted);
    font-size: 0.7em;
    margin-left: 0.25rem;
}

/* ---- diagram boxes / flow ---- */
.flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
}

.flow-box {
    flex: 1 1 0;
    min-width: 92px;
    text-align: center;
    font-family: var(--sans);
    font-size: 0.82rem;
    color: var(--ink);
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    padding: 0.7rem 0.5rem;
    cursor: pointer;
    transition: all var(--ease);
}

.flow-box small {
    display: block;
    color: var(--muted);
    font-size: 0.7rem;
    margin-top: 0.2rem;
}

.flow-box:hover,
.flow-box.on {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.flow-arrow {
    color: var(--muted);
    font-size: 1.1rem;
    flex: none;
}

/* ---- bar chart rows ---- */
.bars {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bar-row {
    display: grid;
    grid-template-columns: 7.5rem 1fr auto;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.85rem;
}

.bar-row .bar-label {
    font-family: var(--mono);
    color: var(--text);
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bar-track {
    height: 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 999px;
    transition: width 0.3s ease;
}

.bar-row .bar-val {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--muted);
    min-width: 3.5rem;
    text-align: right;
}

/* ---- metric / key-value cards ---- */
.kv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.8rem;
    margin-top: 1rem;
}

.kv-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.8rem 0.9rem;
}

.kv-card .k {
    font-family: var(--sans);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 0.3rem;
}

.kv-card .v {
    font-family: var(--serif);
    font-size: 1.5rem;
    color: var(--ink);
    line-height: 1;
}

.kv-card .v small {
    font-family: var(--sans);
    font-size: 0.7rem;
    color: var(--muted);
}

/* ---- readout line ---- */
.readout {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--bg);
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    padding: 0.7rem 0.9rem;
    margin-top: 1rem;
    line-height: 1.6;
}

.readout b {
    color: var(--accent);
}

/* ---- two-column viz body ---- */
.viz-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    align-items: start;
}

.tag {
    display: inline-block;
    font-family: var(--sans);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 5px;
    padding: 0.12rem 0.45rem;
    margin-bottom: 0.4rem;
}

/* ---- course syllabus landing ---- */
.syllabus {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap);
    margin-top: 2rem;
}

.syllabus .col {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem 1.3rem;
    transition: border-color var(--ease);
}

.syllabus .col:hover {
    border-color: var(--border-strong);
}

.syllabus .col-num {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--accent);
    letter-spacing: 0.1em;
}

.syllabus .col h3 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.5rem;
    color: var(--ink);
    margin: 0.3rem 0 0.2rem;
}

.syllabus .col h3 a {
    color: var(--ink);
    transition: color var(--ease);
}

.syllabus .col h3 a:hover {
    color: var(--accent);
}

.syllabus .col .count {
    font-family: var(--sans);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

.syllabus .col ol {
    list-style: none;
    counter-reset: t;
    padding: 0;
    margin: 1rem 0 1.2rem;
}

.syllabus .col ol li {
    counter-increment: t;
    position: relative;
    padding: 0.35rem 0 0.35rem 1.8rem;
    font-size: 0.92rem;
    border-bottom: 1px dotted var(--border);
}

.syllabus .col ol li:last-child {
    border-bottom: none;
}

.syllabus .col ol li::before {
    content: counter(t, decimal-leading-zero);
    position: absolute;
    left: 0;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--muted);
}

.syllabus .col .enter {
    display: inline-block;
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--ink);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    padding: 0.45rem 1.1rem;
    transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.syllabus .col .enter:hover {
    background: var(--ink);
    color: var(--bg);
    border-color: var(--ink);
}

footer.foot {
    grid-column: 1 / -1;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

/* ---- responsive ---- */
@media (max-width: 860px) {
    .syllabus {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .viz-cols {
        grid-template-columns: 1fr;
    }

    .bar-row {
        grid-template-columns: 5.5rem 1fr auto;
    }
}