/* ==========================================================================
   M3 Workshop page styles — v4 (single blue accent system)
   Token system:
     --navy / --navy-deep : heading & primary text
     --slate / --slate-bg : secondary copy, neutral fills
     --accent               : single blue accent, drawn from the hero
                              gradient family — used for links, active
                              states, glows, and the practical tag.
     --accent-glow          : a lighter tint of --accent, used only for the
                              hero's matrix-grid glow dots so they stay
                              visible against the dark blue gradient.
     --accent-ink            : AA-safe darker shade of --accent for
                              text/labels on light backgrounds (WCAG
                              contrast-checked).
     --mono / --display    : JetBrains Mono (utility) + Geist (body/headings)
   ========================================================================== */

:root {
    --navy: #0f2654;
    --navy-deep: #0a1a3d;
    --slate: #526079;
    --slate-bg: #eef2f8;
    --border: #e2e8f2;
    --accent: #2563eb;
    --accent-glow: #60a5fa;
    --accent-ink: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.12);
    --bg: #f8fbff;
    --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    --display: 'Geist', sans-serif;
    --nav-offset: 72px;
    --day-nav-offset: 116px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--display);
    background: var(--bg);
    color: #1d2330;
}

a {
    outline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-ink);
    outline-offset: 3px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------------------------------------------------------------------- */
/* Hero                                                                    */
/* ---------------------------------------------------------------------- */

.hero-section {
    position: relative;
    padding: 118px 0 70px;
    background: linear-gradient(180deg, var(--navy-deep) 0%, #123a68 60%, #0b5692 100%);
    color: #fff;
    overflow: hidden;
}

.matrix-grid {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.25) 75%, transparent 100%);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.25) 75%, transparent 100%);
}

.matrix-grid::before,
.matrix-grid::after {
    content: "";
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-glow);
    box-shadow: 0 0 14px 3px rgba(96, 165, 250, 0.55);
    opacity: 0.9;
}

.matrix-grid::before {
    top: 168px;
    left: 12%;
}

.matrix-grid::after {
    top: 280px;
    left: 62%;
}

.hero-badge {
    position: relative;
    display: inline-block;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.22);
    color: #f8fafc;
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
}

.hero-title {
    position: relative;
    font-family: var(--display);
    font-weight: 800;
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: #fff;
    margin: 0;
}

.hero-subtitle {
    position: relative;
    font-size: 1.05rem;
    line-height: 1.65;
    color: rgba(255, 255, 255, 0.88);
    margin-top: 1.1rem;
    max-width: 620px;
}

/* "Arc of the week" card — a short thesis summary, deliberately NOT a
   duplicate of the full day-by-day list that lives in the programme
   section below, to avoid repeating the same content twice on one page */
.glance-card {
    position: relative;
    background: rgba(10, 26, 61, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 18px;
    padding: 28px 26px;
    backdrop-filter: blur(6px);
}

.glance-eyebrow {
    display: block;
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-glow);
    margin-bottom: 1rem;
}

.arc-list {
    list-style: none;
    margin: 0 0 1.4rem;
    padding: 0;
}

.arc-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.98rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.92);
}

.arc-list li+li {
    margin-top: 0.7rem;
    padding-top: 0.7rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.arc-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-glow);
    flex-shrink: 0;
}

.arc-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--mono);
    font-size: 0.82rem;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    padding-bottom: 2px;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.arc-cta:hover,
.arc-cta:focus-visible {
    color: var(--accent-glow);
    border-color: var(--accent-glow);
}

/* ---------------------------------------------------------------------- */
/* Logistics strip                                                        */
/* ---------------------------------------------------------------------- */

.logistics-strip {
    background: #fff;
    border-bottom: 1px solid var(--border);
}

.logistics-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 28px 40px;
    padding: 22px 0;
}

.logistics-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.logistics-label {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-ink);
}

.logistics-value {
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--navy-deep);
}

/* ---------------------------------------------------------------------- */
/* Sticky day nav (wayfinding)                                            */
/* ---------------------------------------------------------------------- */

.day-nav {
    position: sticky;
    top: var(--nav-offset);
    z-index: 1030;
    background: rgba(248, 251, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.day-nav.is-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.day-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    overflow-x: auto;
}

.day-nav-links {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.day-nav-links a {
    font-family: var(--mono);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--slate);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 999px;
    white-space: nowrap;
    transition: background 0.2s ease, color 0.2s ease;
}

.day-nav-links a:hover,
.day-nav-links a:focus-visible {
    background: var(--slate-bg);
    color: var(--navy);
}

.day-nav-links a.is-active {
    background: var(--accent-ink);
    color: #fff;
}

.day-nav-top {
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--slate);
    text-decoration: none;
    white-space: nowrap;
}

.day-nav-top:hover,
.day-nav-top:focus-visible {
    color: var(--accent-ink);
}

@media (prefers-reduced-motion: reduce) {
    .day-nav {
        transition: none;
    }
}

/* ---------------------------------------------------------------------- */
/* Programme / timeline                                                   */
/* ---------------------------------------------------------------------- */

.programme-section {
    padding-top: 60px;
    padding-bottom: 70px;
    scroll-margin-top: var(--nav-offset);
}

.programme-intro {
    max-width: 760px;
    margin-bottom: 2rem;
}

.section-eyebrow {
    display: block;
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-ink);
    margin-bottom: 0.5rem;
}

.programme-intro h2 {
    color: var(--navy-deep);
    font-weight: 800;
    margin-bottom: 0.6rem;
}

.programme-intro p {
    color: var(--slate);
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 1.25rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--slate);
}

.legend-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
}

.legend-tag-theory {
    color: var(--navy);
    background: var(--slate-bg);
}

.legend-tag-practical {
    color: #fff;
    background: var(--accent-ink);
}

.timeline {
    position: relative;
}

.day-card {
    position: relative;
    display: flex;
    gap: 24px;
    margin-bottom: 4px;
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    scroll-margin-top: var(--day-nav-offset);
}

.day-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Per-card marker + connector line: each card draws its own short segment
   down to the next one, so the timeline degrades gracefully at any width
   instead of relying on one fragile absolutely-positioned line */
.day-marker {
    flex-shrink: 0;
    width: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.day-node {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--mono);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--navy);
    z-index: 1;
}

.day-card:target .day-node,
.day-card:hover .day-node {
    border-color: var(--accent);
    color: var(--accent-ink);
}

.day-line {
    flex: 1;
    width: 2px;
    min-height: 28px;
    background: var(--border);
    margin: 6px 0;
}

.day-body {
    flex: 1;
    min-width: 0;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 16px 32px rgba(19, 36, 72, 0.05);
    padding: 28px 32px;
    margin-bottom: 24px;
}

.day-card-header {
    margin-bottom: 1.1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.day-tag {
    display: block;
    font-family: var(--mono);
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--accent-ink);
    margin-bottom: 0.35rem;
}

.day-title {
    color: var(--navy-deep);
    font-weight: 800;
    margin: 0;
}

.session-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

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

.session-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.session-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.28rem 0.65rem;
    border-radius: 999px;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 0.35rem;
}

.session-tag-theory {
    color: var(--navy);
    background: var(--slate-bg);
}

.session-tag-theory::before {
    content: "\03A3";
    /* Σ */
    font-size: 0.85rem;
}

.session-tag-practical {
    color: #fff;
    background: var(--accent-ink);
}

.session-tag-practical::before {
    content: "\25B6";
    /* ▶ */
    font-size: 0.6rem;
}

.session-time {
    font-family: var(--mono);
    font-size: 0.76rem;
    color: var(--slate);
    margin-bottom: 0.6rem;
}

/* Topic links: underline draws in on hover/focus using native
   text-decoration so it wraps correctly even on multi-line titles */
.topic-link {
    display: inline-block;
    width: fit-content;
    font-size: 1.06rem;
    font-weight: 700;
    color: var(--navy-deep);
    text-decoration: underline;
    text-decoration-color: transparent;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    margin-bottom: 0.4rem;
    transition: color 0.2s ease, text-decoration-color 0.25s ease;
}

.topic-link:hover,
.topic-link:focus-visible {
    color: var(--accent-ink);
    text-decoration-color: var(--accent);
}

/* External-link indicator */
.external-icon {
    display: inline-block;
    margin-left: 0.3rem;
    font-size: 0.85em;
}

.topic-desc {
    font-size: 0.92rem;
    color: var(--slate);
    margin: 0;
    line-height: 1.55;
}

.footer-note {
    font-size: 0.95rem;
    color: var(--slate);
}

/* ---------------------------------------------------------------------- */
/* Reduced motion                                                         */
/* ---------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {

    .day-card,
    .topic-link,
    .arc-cta {
        transition: none !important;
    }

    .day-card {
        opacity: 1;
        transform: none;
    }
}

/* ---------------------------------------------------------------------- */
/* Responsive                                                             */
/* ---------------------------------------------------------------------- */

@media (max-width: 992px) {
    .session-list {
        grid-template-columns: 1fr;
    }

    .session-list-two {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 84px 0 44px;
    }

    .day-body {
        padding: 20px;
    }

    .logistics-inner {
        gap: 18px 28px;
    }
}

@media (max-width: 576px) {
    .day-marker {
        width: 42px;
    }

    .day-node {
        width: 42px;
        height: 42px;
        font-size: 0.78rem;
    }

    .day-body {
        padding: 18px;
    }
}