/* ============================================================
   Stock Alerts Case Study — landing page
   Self-contained. Shares the "warm editorial" tokens with the
   slide decks, but depends on nothing outside this folder.
   Light default + [data-theme="dark"] override.
   ============================================================ */

/* ---------- Tokens: LIGHT (default) ---------- */
:root {
    --bg: #FBF9F4;
    --surface: #FFFFFF;
    --surface-alt: #F3EEE4;
    --text: #1B1A17;
    --text-2: #6C665B;
    --text-3: #938C7E;
    --border: #E8E1D4;
    --border-strong: #DAD1BF;

    --accent: #C05A31;
    --accent-hover: #A94C27;
    --accent-contrast: #FFFFFF;
    --accent-soft: rgba(192, 90, 49, 0.10);
    --accent-line: rgba(192, 90, 49, 0.28);

    --accent-2: #2C6E49;
    --accent-2-soft: rgba(44, 110, 73, 0.10);

    --highlight: #B8860B;
    --highlight-fill: #F2C14E;
    --highlight-soft: rgba(242, 193, 78, 0.16);

    --shadow: 0 1px 2px rgba(27, 26, 23, .04), 0 8px 24px rgba(27, 26, 23, .06);
    --shadow-lg: 0 12px 40px rgba(27, 26, 23, .12);
    --nav-bg: rgba(251, 249, 244, .82);
    --hero-glow-1: rgba(192, 90, 49, 0.10);
    --hero-glow-2: rgba(44, 110, 73, 0.08);
    --code-bg: #FBF7EF;

    --font-display: 'Bricolage Grotesque', 'Inter', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --radius: 14px;
    --radius-sm: 10px;
    --radius-pill: 50px;
}

/* ---------- Tokens: DARK (warm espresso) ---------- */
:root[data-theme="dark"] {
    --bg: #211D17;
    --surface: #2A251D;
    --surface-alt: #332C21;
    --text: #F3EEE4;
    --text-2: #B5AD9E;
    --text-3: #857D6D;
    --border: #3D3626;
    --border-strong: #4E4633;

    --accent: #E3A47C;
    --accent-hover: #EDB18C;
    --accent-contrast: #211D17;
    --accent-soft: rgba(227, 164, 124, .14);
    --accent-line: rgba(227, 164, 124, .34);

    --accent-2: #8FBF9C;
    --accent-2-soft: rgba(143, 191, 156, .14);

    --highlight: #E7C05F;
    --highlight-fill: #E7C05F;
    --highlight-soft: rgba(231, 192, 95, .13);

    --shadow: 0 1px 2px rgba(0, 0, 0, .28), 0 10px 30px rgba(0, 0, 0, .32);
    --shadow-lg: 0 16px 50px rgba(0, 0, 0, .45);
    --nav-bg: rgba(33, 29, 23, .82);
    --hero-glow-1: rgba(227, 164, 124, .13);
    --hero-glow-2: rgba(143, 191, 156, .09);
    --code-bg: #1B1811;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    transition: background .3s ease, color .3s ease;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-display);
    letter-spacing: -.02em;
    line-height: 1.15;
}

a {
    color: var(--accent);
}

code {
    font-family: var(--font-mono);
    font-size: .88em;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: .08em .36em;
    color: var(--accent);
}

.wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ---------------- nav ---------------- */

.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1180px;
    margin: 0 auto;
    padding: .85rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -.02em;
}

.logo span {
    color: var(--accent);
}

.nav-spacer {
    flex: 1;
}

.nav-link {
    color: var(--text-2);
    text-decoration: none;
    font-size: .88rem;
    font-weight: 500;
    padding: .4rem .2rem;
    transition: color .15s;
}

.nav-link:hover {
    color: var(--text);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-strong);
    color: var(--text-2);
    border-radius: 50%;
    width: 2.1rem;
    height: 2.1rem;
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: .95rem;
    transition: .15s;
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent-line);
}

/* ---------------- buttons ---------------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .8rem 1.5rem;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: .95rem;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform .15s, box-shadow .15s, background .15s;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--accent);
    color: var(--accent-contrast);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}

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

/* ---------------- hero ---------------- */

.hero {
    position: relative;
    padding: 6rem 0 5rem;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(900px 520px at 18% 0%, var(--hero-glow-1), transparent 62%),
        radial-gradient(760px 460px at 88% 100%, var(--hero-glow-2), transparent 62%);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    color: var(--accent);
    border-radius: var(--radius-pill);
    padding: .35rem .95rem;
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    margin-bottom: 1.6rem;
}

.hero h1 {
    font-size: clamp(2.4rem, 5.4vw, 4.2rem);
    font-weight: 700;
    max-width: 16ch;
}

.hero h1 em {
    font-style: normal;
    color: var(--accent);
}

.hero-sub {
    margin-top: 1.4rem;
    font-size: clamp(1rem, 1.4vw, 1.2rem);
    color: var(--text-2);
    max-width: 62ch;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: .9rem;
    flex-wrap: wrap;
    margin-top: 2.2rem;
}

.hero-facts {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-top: 3rem;
    padding-top: 1.6rem;
    border-top: 1px solid var(--border);
}

.fact .n {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

.fact .l {
    font-family: var(--font-mono);
    font-size: .66rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text-3);
}

/* ---------------- sections ---------------- */

.section {
    padding: 4.5rem 0;
    border-top: 1px solid var(--border);
}

.section-head {
    margin-bottom: 2.2rem;
    max-width: 62ch;
}

.tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: .64rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: var(--radius-pill);
    padding: .25rem .8rem;
    margin-bottom: .9rem;
}

.section-head h2 {
    font-size: clamp(1.7rem, 3vw, 2.4rem);
    font-weight: 650;
}

.section-head p {
    margin-top: .8rem;
    color: var(--text-2);
}

/* ---------------- brief ---------------- */

.brief-row {
    display: grid;
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: center;
}

.sticky-note {
    background: linear-gradient(160deg, #F2C14E, #E3A24E);
    color: #2B2210;
    border-radius: 6px;
    padding: 1.9rem 2rem;
    transform: rotate(-.9deg);
    box-shadow: var(--shadow-lg);
}

.sticky-note h3 {
    color: #2B2210;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.sticky-note ol {
    margin-left: 1.1rem;
}

.sticky-note li {
    margin-bottom: .75rem;
    line-height: 1.5;
}

.sticky-note .ps {
    margin-top: 1.1rem;
    padding-top: .85rem;
    border-top: 1px dashed rgba(43, 34, 16, .42);
    font-style: italic;
}

.callout {
    border-left: 3px solid var(--accent);
    background: var(--surface);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 1rem 1.3rem;
    color: var(--text-2);
}

.callout b,
.callout strong {
    color: var(--text);
}

.prose p+p {
    margin-top: 1rem;
}

.prose p {
    color: var(--text-2);
}

/* ---------------- deck cards ---------------- */

.deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
    gap: 1.5rem;
}

.deck-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.8rem;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
    transition: transform .18s cubic-bezier(.2, .8, .2, 1), box-shadow .18s, border-color .18s;
}

.deck-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: var(--accent);
}

.deck-card.s1::before {
    background: var(--accent-2);
}

.deck-card.s2::before {
    background: var(--highlight-fill);
}

.deck-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-strong);
}

.deck-card .kicker {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: .6rem;
}

.deck-card.s1 .kicker {
    color: var(--accent-2);
}

.deck-card.s2 .kicker {
    color: var(--highlight);
}

.deck-card h3 {
    font-size: 1.4rem;
    margin-bottom: .55rem;
}

.deck-card>p {
    color: var(--text-2);
    font-size: .94rem;
    line-height: 1.55;
}

.deck-card ul {
    list-style: none;
    margin: 1.1rem 0 0;
}

.deck-card li {
    position: relative;
    padding-left: 1.35rem;
    margin-bottom: .42rem;
    font-size: .875rem;
    color: var(--text-2);
}

.deck-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--text-3);
}

.deck-meta {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
    margin-top: auto;
    padding-top: 1.2rem;
    font-family: var(--font-mono);
    font-size: .66rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-3);
}

.deck-open {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-strong);
    font-weight: 600;
    color: var(--accent);
    font-size: .92rem;
}

.deck-card:hover .deck-open {
    text-decoration: underline;
}

/* ---------------- four questions ---------------- */

.q4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
    gap: 1rem;
}

.q4 .cell {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 1.2rem;
}

.q4 .cell .n {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .14em;
    color: var(--accent);
}

.q4 .cell h4 {
    font-size: 1.02rem;
    margin: .45rem 0 .35rem;
}

.q4 .cell p {
    font-size: .85rem;
    color: var(--text-3);
}

/* ---------------- napkin ---------------- */

.napkin {
    display: flex;
    align-items: stretch;
    gap: .4rem;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 22px, var(--border) 22px, var(--border) 22.6px),
        var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1.3rem;
    margin-top: 1.6rem;
}

.napkin .nb {
    flex: 1;
    min-width: 0;
    background: var(--surface);
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: .9rem .7rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: .3rem;
}

.napkin .nb span {
    font-family: var(--font-mono);
    font-size: .56rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text-3);
}

.napkin .nb b {
    font-size: .88rem;
}

.napkin .nb.pipe {
    flex: .78;
    background: transparent;
    border-style: dashed;
}

.napkin .ar {
    flex: 0 0 1.3rem;
    display: grid;
    place-items: center;
    color: var(--text-3);
}

.napkin-cap {
    text-align: center;
    margin-top: 1rem;
    font-size: .84rem;
    color: var(--text-3);
}

/* ---------------- principles ---------------- */

.principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
    gap: 1.4rem 2rem;
}

.principle {
    border-left: 3px solid var(--accent);
    padding: .2rem 0 .2rem 1.05rem;
}

.principle b {
    display: block;
    font-family: var(--font-display);
    font-size: 1.02rem;
    margin-bottom: .3rem;
}

.principle span {
    font-size: .88rem;
    color: var(--text-2);
}

/* ---------------- keys ---------------- */

kbd {
    font-family: var(--font-mono);
    font-size: .8em;
    background: var(--surface-alt);
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
    border-radius: 5px;
    padding: .1em .42em;
    color: var(--text-2);
}

/* ---------------- footer ---------------- */

.footer {
    border-top: 1px solid var(--border);
    padding: 4rem 1.5rem 3rem;
    text-align: center;
    background: var(--surface-alt);
}

.footer h3 {
    font-size: 1.6rem;
    margin-bottom: .8rem;
}

.footer p {
    color: var(--text-2);
    max-width: 56ch;
    margin: 0 auto;
}

.footer .fine {
    margin-top: 2.4rem;
    font-size: .8rem;
    color: var(--text-3);
}

/* ---------------- responsive ---------------- */

@media (max-width: 860px) {
    .brief-row {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .sticky-note {
        transform: none;
    }

    .napkin {
        flex-direction: column;
    }

    .napkin .ar {
        transform: rotate(90deg);
        flex-basis: 1.1rem;
    }

    .hero {
        padding: 3.5rem 0 3rem;
    }

    .hero-facts {
        gap: 1.5rem;
    }

    .nav-link.hide-sm {
        display: none;
    }
}