/* ==========================================================================
   Beyond Passwords — styles
   Presentation-first: big type, high contrast, one idea per screen.
   ========================================================================== */

:root {
    --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --font-mono: "Cascadia Code", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 16px;
    --radius-sm: 10px;
    --speed: .22s;
    --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ------------------------------------------------------------------ themes */

[data-theme="dark"] {
    --bg-0: #0d0726;
    --bg-1: #150c33;
    --surface: rgba(30, 18, 66, .72);
    --surface-2: rgba(48, 29, 96, .5);
    --border: rgba(168, 85, 247, .26);
    --border-strong: rgba(168, 85, 247, .55);
    --text: #ece9ff;
    --text-muted: #a99fd4;
    --accent: #a855f7;
    --accent-2: #22d3ee;
    --code-bg: rgba(10, 5, 26, .75);
    --ok: #34d399;
    --warn: #fbbf24;
    --bad: #fb7185;
    --b1: #a855f7;
    --b2: #22d3ee;
    --blob-opacity: .28;
}

[data-theme="light"] {
    --bg-0: #f7f5f0;
    --bg-1: #efece4;
    --surface: rgba(255, 255, 255, .88);
    --surface-2: rgba(240, 236, 228, .9);
    --border: rgba(76, 60, 110, .22);
    --border-strong: rgba(76, 60, 110, .45);
    --text: #221a38;
    --text-muted: #5f5580;
    --accent: #6d28d9;
    --accent-2: #0e7490;
    --code-bg: rgba(232, 228, 240, .95);
    --ok: #047857;
    --warn: #b45309;
    --bad: #be123c;
    --b1: #c4b5fd;
    --b2: #99f6e4;
    --blob-opacity: .4;
}

[data-theme="contrast"] {
    --bg-0: #000;
    --bg-1: #0a0a0a;
    --surface: #101010;
    --surface-2: #1a1a1a;
    --border: #6b6b6b;
    --border-strong: #9a9a9a;
    --text: #fff;
    --text-muted: #d0d0d0;
    --accent: #ffd60a;
    --accent-2: #4cc9f0;
    --code-bg: #161616;
    --ok: #4ade80;
    --warn: #ffd60a;
    --bad: #ff6b81;
    --b1: transparent;
    --b2: transparent;
    --blob-opacity: 0;
}

/* -------------------------------------------------------------------- base */

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: var(--font-ui);
    color: var(--text);
    background: var(--bg-0);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

.app-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(120% 90% at 50% -10%, var(--bg-1), var(--bg-0) 65%);
}

.blob {
    position: absolute;
    width: 48vmax;
    height: 48vmax;
    border-radius: 50%;
    filter: blur(100px);
    opacity: var(--blob-opacity);
}

.b1 {
    background: var(--b1);
    top: -20vmax;
    left: -12vmax;
}

.b2 {
    background: var(--b2);
    bottom: -22vmax;
    right: -14vmax;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 48px 48px;
    opacity: .25;
    mask-image: radial-gradient(70% 60% at 50% 0%, #000, transparent 75%);
    -webkit-mask-image: radial-gradient(70% 60% at 50% 0%, #000, transparent 75%);
}

code {
    font-family: var(--font-mono);
    font-size: .92em;
    padding: .08em .4em;
    border-radius: 6px;
    background: var(--code-bg);
    border: 1px solid var(--border);
}

kbd {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: .8em;
    line-height: 1.4;
    padding: .1em .5em;
    border-radius: 6px;
    background: var(--code-bg);
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
}

/* ------------------------------------------------------------------ topbar */

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .8rem;
    padding: .55rem clamp(.8rem, 2.5vw, 1.6rem);
    background: color-mix(in srgb, var(--bg-0) 82%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    min-width: 0;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    flex: none;
    border-radius: 10px;
    font-size: 1.05rem;
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
}

.brand-text strong {
    display: block;
    font-size: .95rem;
    line-height: 1.2;
    white-space: nowrap;
}

.brand-text small {
    display: block;
    font-size: .7rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.controls {
    display: flex;
    align-items: center;
    gap: .45rem;
}

.counter {
    font-family: var(--font-mono);
    font-size: .82rem;
    color: var(--text-muted);
    padding-right: .3rem;
    white-space: nowrap;
}

.controls button {
    font: inherit;
    font-size: .84rem;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    padding: .4rem .85rem;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color var(--speed) var(--ease);
}

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

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

.deck {
    min-height: 100vh;
}

.slide {
    display: none;
    flex-direction: column;
    justify-content: center;
    max-width: 1150px;
    margin: 0 auto;
    padding: clamp(4.2rem, 9vh, 6rem) clamp(1.2rem, 4vw, 3rem) clamp(3.6rem, 8vh, 5rem);
}

body[data-mode="present"] .slide.active {
    display: flex;
    min-height: 100vh;
    animation: slide-in .3s var(--ease);
}

@keyframes slide-in {
    from {
        opacity: 0;
        transform: translateY(14px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

/* read mode: everything, stacked */
body[data-mode="read"] .slide {
    display: flex;
    min-height: 0;
    padding-top: clamp(1.6rem, 4vh, 2.6rem);
    padding-bottom: clamp(1.6rem, 4vh, 2.6rem);
    border-bottom: 1px solid var(--border);
}

body[data-mode="read"] .deck {
    padding-top: 3.6rem;
    padding-bottom: 2rem;
}

body[data-mode="read"] .bottombar {
    display: none;
}

/* -------------------------------------------------------------------- type */

.kicker {
    margin: 0 0 .8rem;
    font-size: clamp(.9rem, 1.8vw, 1.1rem);
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent-2);
}

h1 {
    margin: 0 0 1rem;
    font-size: clamp(2.6rem, 8vw, 5rem);
    line-height: 1.05;
    background: linear-gradient(100deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

[data-theme="contrast"] h1 {
    background: none;
    -webkit-background-clip: initial;
    background-clip: initial;
    color: var(--accent);
}

h2 {
    margin: 0 0 1.1rem;
    font-size: clamp(1.7rem, 4.6vw, 2.7rem);
    line-height: 1.15;
}

.lead {
    margin: 0 0 1.3rem;
    font-size: clamp(1.15rem, 2.6vw, 1.55rem);
    line-height: 1.5;
    color: var(--text-muted);
    max-width: 60ch;
}

.lead strong,
.points strong {
    color: var(--text);
}

.title-slide {
    text-align: center;
    align-items: center;
}

.title-slide .lead {
    margin-inline: auto;
}

.hint {
    margin-top: 2.2rem;
    font-size: clamp(.85rem, 1.7vw, 1rem);
    color: var(--text-muted);
}

.points {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: clamp(.7rem, 1.8vh, 1.1rem);
    font-size: clamp(1.05rem, 2.3vw, 1.4rem);
    line-height: 1.55;
    max-width: 62ch;
}

.points li {
    padding-left: 1.6rem;
    position: relative;
}

.points li::before {
    content: "✦";
    position: absolute;
    left: 0;
    color: var(--accent-2);
}

.points.recap {
    font-size: clamp(1.2rem, 2.8vw, 1.7rem);
}

.foot-note {
    margin: 1.6rem 0 0;
    font-size: clamp(.9rem, 1.9vw, 1.1rem);
    color: var(--text-muted);
    max-width: 70ch;
}

.punch {
    margin: 1.8rem 0 0;
    font-size: clamp(1.25rem, 3vw, 1.8rem);
    line-height: 1.45;
    font-weight: 600;
}

.sources {
    margin: 2.2rem 0 0;
    font-size: clamp(.72rem, 1.4vw, .85rem);
    color: var(--text-muted);
    max-width: 80ch;
}

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

.cards {
    display: grid;
    gap: clamp(.7rem, 1.6vw, 1.1rem);
    margin: .4rem 0;
}

.cards.four {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.cards.three {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.cards.two {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.mini-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: clamp(.9rem, 2vw, 1.3rem);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.mc-glyph {
    display: block;
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: .4rem;
}

.mini-card h3 {
    margin: 0 0 .35rem;
    font-size: clamp(1rem, 2.1vw, 1.25rem);
}

.mini-card p {
    margin: 0;
    font-size: clamp(.9rem, 1.9vw, 1.08rem);
    color: var(--text-muted);
    line-height: 1.5;
}

.keycard {
    border-color: var(--border-strong);
}

/* ------------------------------------------------------------------- stats */

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: clamp(.7rem, 1.6vw, 1.1rem);
    margin-top: 1.4rem;
}

.stat {
    display: flex;
    align-items: baseline;
    gap: .9rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--ok);
    border-radius: var(--radius-sm);
    padding: .9rem 1.1rem;
}

.stat strong {
    font-size: clamp(1.6rem, 3.4vw, 2.3rem);
    color: var(--ok);
    white-space: nowrap;
}

.stat span {
    font-size: clamp(.85rem, 1.8vw, 1.02rem);
    color: var(--text-muted);
    line-height: 1.45;
}

.stat em {
    font-style: normal;
    opacity: .75;
}

/* ------------------------------------------------------------------ ladder */

.ladder {
    display: grid;
    gap: clamp(.6rem, 1.4vh, .9rem);
    margin: .4rem 0;
}

.rung {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: clamp(.8rem, 1.8vh, 1.2rem) clamp(1rem, 2.4vw, 1.5rem);
}

.rung-glyph {
    font-size: clamp(1.6rem, 3.2vw, 2.2rem);
    flex: none;
}

.rung h3 {
    margin: 0 0 .2rem;
    font-size: clamp(1.05rem, 2.3vw, 1.35rem);
}

.rung p {
    margin: 0;
    font-size: clamp(.9rem, 1.9vw, 1.1rem);
    color: var(--text-muted);
    line-height: 1.45;
}

.rung.top {
    border-left: 4px solid var(--ok);
    margin-right: 0;
}

.rung.mid {
    border-left: 4px solid var(--warn);
    margin-right: clamp(0rem, 6vw, 4rem);
}

.rung.low {
    border-left: 4px solid var(--bad);
    margin-right: clamp(0rem, 12vw, 8rem);
}

/* -------------------------------------------------------------------- flow */

.flow {
    margin: .4rem 0 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
    display: grid;
    gap: clamp(.6rem, 1.5vh, 1rem);
    max-width: 66ch;
}

.flow li {
    counter-increment: step;
    position: relative;
    padding: clamp(.7rem, 1.6vh, 1rem) 1.1rem clamp(.7rem, 1.6vh, 1rem) 3.4rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: clamp(.98rem, 2.1vw, 1.25rem);
    line-height: 1.5;
}

.flow li::before {
    content: counter(step);
    position: absolute;
    left: .9rem;
    top: 50%;
    transform: translateY(-50%);
    display: grid;
    place-items: center;
    width: 1.9rem;
    height: 1.9rem;
    border-radius: 50%;
    font-weight: 700;
    font-size: .95rem;
    color: var(--bg-0);
    background: linear-gradient(120deg, var(--accent), var(--accent-2));
}

.flow.slim li {
    padding-top: .55rem;
    padding-bottom: .55rem;
}

.flow.todo {
    max-width: 74ch;
}

.flow.todo li {
    font-size: clamp(.95rem, 2vw, 1.18rem);
}

/* ------------------------------------------------------------- relay chart */

.relay {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: clamp(.4rem, 1.4vw, 1rem);
    flex-wrap: wrap;
    margin: .6rem 0 .4rem;
}

.relay-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .2rem;
    min-width: clamp(120px, 18vw, 190px);
    padding: clamp(.7rem, 1.8vh, 1.1rem) 1rem;
    text-align: center;
    font-weight: 600;
    font-size: clamp(.9rem, 1.9vw, 1.1rem);
    background: var(--surface);
    border: 2px solid var(--border-strong);
    border-radius: var(--radius);
}

.relay-box .rb-glyph {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

.relay-box small {
    display: block;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: .72em;
    color: var(--text-muted);
}

.relay-box.evil {
    border-color: var(--bad);
}

.relay-box.real {
    border-color: var(--ok);
}

.relay-arrow {
    align-self: center;
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--accent-2);
}

.relay-caption {
    margin: 0 0 1rem;
    text-align: center;
    font-size: clamp(.82rem, 1.7vw, .98rem);
    color: var(--text-muted);
}

/* ------------------------------------------------------------------- table */

.table-intro {
    margin: 0 0 1rem;
    font-size: clamp(.9rem, 1.9vw, 1.1rem);
    color: var(--text-muted);
    max-width: 70ch;
}

.table-intro strong {
    color: var(--text);
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin: .4rem 0;
}

.compare {
    width: 100%;
    border-collapse: collapse;
    font-size: clamp(.85rem, 1.9vw, 1.08rem);
    min-width: 640px;
}

.compare th,
.compare td {
    padding: clamp(.5rem, 1.4vh, .8rem) .9rem;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.compare th:first-child,
.compare td:first-child {
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

.compare thead th {
    font-size: .82em;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--text-muted);
    background: var(--surface-2);
}

.compare td.yes {
    color: var(--ok);
    font-weight: 700;
}

.compare td.no {
    color: var(--bad);
    font-weight: 700;
}

.compare td.part {
    color: var(--warn);
    font-weight: 700;
}

.compare td.na {
    color: var(--text-muted);
}

.compare .hero-row td {
    background: color-mix(in srgb, var(--ok) 10%, transparent);
}

/* --------------------------------------------------------------- bottombar */

.bottombar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    gap: .9rem;
    padding: .5rem clamp(.8rem, 2.5vw, 1.6rem);
    background: color-mix(in srgb, var(--bg-0) 82%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
}

.bottombar button {
    font: inherit;
    font-size: 1.05rem;
    line-height: 1;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    width: 42px;
    height: 42px;
    flex: none;
    cursor: pointer;
    transition: border-color var(--speed) var(--ease);
}

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

.progress {
    flex: 1;
    height: 5px;
    border-radius: 999px;
    background: var(--surface-2);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width var(--speed) var(--ease);
}

/* ---------------------------------------------------------------- blackout */

.blackout {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: #000;
    cursor: pointer;
}

/* ------------------------------------------------------------------- focus */

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

/* keep the site-wide backlink pill clear of the bottom bar */
.rp-backlink {
    bottom: 64px !important;
}

/* ------------------------------------------------------------------- print */

@media print {
    .topbar,
    .bottombar,
    .app-bg,
    .blackout {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    body[data-mode] .slide {
        display: flex !important;
        min-height: 0;
        break-inside: avoid;
        border-bottom: 1px solid #ccc;
        padding: 1.2rem 0;
    }

    h1,
    .punch {
        color: #000;
        background: none;
        -webkit-background-clip: initial;
        background-clip: initial;
    }
}

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

@media (max-width: 640px) {
    .brand-text small {
        display: none;
    }

    .controls button {
        padding: .38rem .6rem;
    }

    .relay {
        flex-direction: column;
        align-items: stretch;
    }

    .relay-arrow {
        transform: rotate(90deg);
    }

    .rung.mid,
    .rung.low {
        margin-right: 0;
    }
}

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

    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }
}