/* ═══════════════════════════════════════════════════════════════════
   Kide — kide is Finnish for "crystal".
   Identity: polar night warmed by the ember crystal of the Kide logo.
   ═══════════════════════════════════════════════════════════════════ */

:root {
    --night-0: #0d0805;
    --night-1: #160d07;
    --night-2: #1d120a;

    --ember-1: #ffb26b;      /* primary ice */
    --ember-2: #f97316;
    --gold: #fbbf24;     /* aurora green */
    --crimson: #e25c4a;     /* nod to Kotlin, used sparingly */

    --text-1: #faf3ec;
    --text-2: #b0a294;
    --text-3: #80705f;

    --line: rgba(255, 178, 107, 0.12);
    --line-strong: rgba(255, 178, 107, 0.28);
    --panel: rgba(29, 18, 11, 0.72);

    --font-main: 'Inter', system-ui, sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    --r: 14px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 6rem; }

body {
    background: var(--night-0);
    color: var(--text-1);
    font-family: var(--font-main);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(255, 178, 107, 0.25); }

/* ── Atmosphere ─────────────────────────────────────────────────── */

.aurora {
    position: fixed;
    inset: -20% -10% auto -10%;
    height: 75vh;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(45% 60% at 18% 22%, rgba(251, 191, 36, 0.14), transparent 70%),
        radial-gradient(50% 65% at 62% 12%, rgba(249, 115, 22, 0.16), transparent 70%),
        radial-gradient(40% 55% at 88% 30%, rgba(226, 92, 74, 0.12), transparent 70%);
    filter: blur(40px);
    animation: aurora-drift 24s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
    from { transform: translateX(-3%) skewY(-1.5deg); opacity: 0.9; }
    to   { transform: translateX(3%)  skewY(1.5deg);  opacity: 1; }
}

.grid-lines {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, black 25%, transparent 78%);
    -webkit-mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, black 25%, transparent 78%);
    opacity: 0.5;
}

/* ── Type ───────────────────────────────────────────────────────── */

h1 {
    font-size: clamp(2.8rem, 6vw, 4.6rem);
    font-weight: 900;
    line-height: 1.04;
    letter-spacing: -0.03em;
    margin-bottom: 1.4rem;
}

h2 {
    font-size: clamp(1.8rem, 3.4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 1rem;
}

h3 { font-size: 1.13rem; font-weight: 700; margin-bottom: 0.6rem; letter-spacing: -0.01em; }

p { color: var(--text-2); }
p strong { color: var(--text-1); font-weight: 600; }
p em { color: var(--ember-1); font-style: italic; }

p code, .card code, .agent-step code {
    font-family: var(--font-code);
    font-size: 0.86em;
    color: var(--ember-1);
    background: rgba(255, 178, 107, 0.08);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 0.08em 0.4em;
    white-space: nowrap;
}

.gradient-text {
    background: linear-gradient(100deg, var(--ember-1) 10%, var(--gold) 55%, var(--ember-2) 95%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.kicker {
    display: block;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 0.9rem;
}

/* ── Nav ────────────────────────────────────────────────────────── */

.navbar {
    position: fixed;
    top: 0; width: 100%;
    z-index: 100;
    background: rgba(13, 8, 5, 0.65);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease, background 0.3s ease;
}
.navbar.scrolled { border-bottom-color: var(--line); background: rgba(13, 8, 5, 0.85); }

.nav-content {
    max-width: 1180px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-1);
    text-decoration: none;
}
.logo-mark {
    width: 28px;
    height: 28px;
    display: block;
    filter: drop-shadow(0 0 10px rgba(255, 120, 40, 0.35));
}

.nav-links { display: flex; gap: 1.8rem; align-items: center; }
.nav-links a {
    color: var(--text-2);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.92rem;
    transition: color 0.25s ease;
}
.nav-links a:hover { color: var(--ember-1); }

/* ── Buttons ────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.6rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    font-family: var(--font-main);
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.btn-primary {
    background: linear-gradient(120deg, var(--ember-2), var(--gold));
    color: #2a1305;
    box-shadow: 0 4px 24px rgba(249, 115, 22, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(251, 191, 36, 0.35); }

.btn-secondary {
    background: rgba(255, 178, 107, 0.07);
    border: 1px solid var(--line-strong);
    color: var(--text-1);
}
.btn-secondary:hover { background: rgba(255, 178, 107, 0.14); }

.btn-outline {
    background: transparent;
    border: 1px solid var(--line);
    color: var(--text-1) !important;
    font-size: 0.88rem;
    padding: 0.55rem 1.1rem;
}
.btn-outline:hover { border-color: var(--ember-1); color: var(--ember-1) !important; }
.btn.small { padding: 0.45rem 1rem; font-size: 0.85rem; }
.btn.copied { border-color: var(--gold); color: var(--gold) !important; }

/* ── Layout ─────────────────────────────────────────────────────── */

main { max-width: 1180px; margin: 0 auto; padding: 8.5rem 2rem 3rem; }
section { margin-bottom: 9rem; }
.section-header { max-width: 640px; margin: 0 auto 3.5rem; text-align: center; }

/* ── Hero ───────────────────────────────────────────────────────── */

.hero {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 4rem;
    align-items: center;
    padding: 3rem 0 4rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.45rem 1rem;
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.25);
    color: var(--gold);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    margin-bottom: 1.6rem;
}
.badge-pulse {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--gold);
    animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.subtitle { font-size: 1.13rem; margin-bottom: 2.2rem; }
.cta-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-footnote {
    margin-top: 1.6rem;
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-3);
    letter-spacing: 0.02em;
}

/* ── Code windows (shared) ──────────────────────────────────────── */

.code-window {
    background: var(--panel);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--line);
    border-radius: var(--r);
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 178, 107, 0.06);
}

.window-header {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 0.8rem 1.1rem;
    background: rgba(13, 8, 5, 0.55);
    border-bottom: 1px solid var(--line);
}
.wdot { width: 11px; height: 11px; border-radius: 50%; background: rgba(255, 178, 107, 0.16); border: 1px solid var(--line); }
.window-title {
    margin: 0 auto;
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-3);
}
.rec {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-family: var(--font-code); font-size: 0.7rem; font-weight: 700;
    color: #f87171; letter-spacing: 0.12em;
}
.rec-dot { width: 8px; height: 8px; border-radius: 50%; background: #f87171; animation: pulse 1.6s ease-in-out infinite; }

pre { padding: 1.6rem; overflow-x: auto; }
pre code { font-family: var(--font-code); font-size: 0.85rem; line-height: 1.7; color: #f0e5d8; display: block; }

/* Syntax highlighting (applied by script.js) */
.tok-kw  { color: #ffb26b; font-weight: 500; }
.tok-str { color: #fbbf24; }
.tok-com { color: #80705f; font-style: italic; }
.tok-ann { color: #f0c674; }
.tok-num { color: #f0a5c0; }
.tok-fn  { color: #f28b82; }

/* ── Hero trace animation ───────────────────────────────────────── */

.trace-window { min-height: 320px; }
.trace {
    list-style: none;
    padding: 1.2rem 1.3rem;
    font-family: var(--font-code);
    font-size: 0.8rem;
    line-height: 2.05;
}
.trace li {
    display: flex;
    gap: 0.8rem;
    align-items: baseline;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.45s ease, transform 0.45s ease;
    white-space: nowrap;
}
.trace li.on { opacity: 1; transform: none; }
.trace .seq { color: var(--text-3); min-width: 2.6em; }
.trace .chip {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 0.05em 0.55em;
    border-radius: 5px;
    min-width: 8.2em;
    text-align: center;
}
.chip.intent { color: var(--ember-1); background: rgba(255, 178, 107, 0.12); }
.chip.action { color: var(--crimson); background: rgba(226, 92, 74, 0.14); }
.chip.state  { color: var(--gold); background: rgba(251, 191, 36, 0.12); }
.chip.effect { color: #4ade80; background: rgba(74, 222, 128, 0.12); }
.trace .payload { color: var(--text-2); overflow: hidden; text-overflow: ellipsis; }
.trace .diff { color: #4ade80; }

/* ── Guarantees & feature cards ─────────────────────────────────── */

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: 1.3rem; }

.card {
    position: relative;
    padding: 1.9rem;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--r);
    transition: transform 0.35s ease, border-color 0.35s ease;
    overflow: hidden;
}
.card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.card p { font-size: 0.94rem; }

.card-num {
    font-family: var(--font-code);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
}

/* ── Code tabs ──────────────────────────────────────────────────── */

.code-tabs { max-width: 820px; margin: 0 auto; }
.tab-bar { display: flex; gap: 0.4rem; margin-bottom: -1px; padding-left: 0.6rem; }
.tab {
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-3);
    background: rgba(29, 18, 11, 0.5);
    border: 1px solid var(--line);
    border-bottom: none;
    border-radius: 9px 9px 0 0;
    padding: 0.55rem 1.1rem;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease;
}
.tab:hover { color: var(--text-1); }
.tab.active { color: var(--ember-1); background: var(--panel); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Agent section ──────────────────────────────────────────────── */

.agent-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 2.4rem;
    align-items: start;
}

.chat-window { min-height: 380px; }
.chat { padding: 1.4rem; font-size: 0.88rem; display: flex; flex-direction: column; gap: 0.9rem; }
.msg { opacity: 0; transform: translateY(8px); transition: opacity 0.5s ease, transform 0.5s ease; max-width: 95%; }
.msg.on { opacity: 1; transform: none; }
.msg .who {
    font-family: var(--font-code);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.25rem;
}
.msg.user .who { color: var(--ember-1); }
.msg.agent .who { color: var(--gold); }
.msg.tool {
    font-family: var(--font-code);
    font-size: 0.76rem;
    color: var(--crimson);
    background: rgba(226, 92, 74, 0.08);
    border: 1px solid rgba(226, 92, 74, 0.2);
    border-radius: 8px;
    padding: 0.5rem 0.9rem;
    align-self: flex-start;
}
.msg .body { color: var(--text-2); line-height: 1.55; }
.msg.user .body { color: var(--text-1); }
.msg .body code { font-size: 0.8em; }
.msg pre.mini {
    margin-top: 0.5rem;
    padding: 0.7rem 0.9rem;
    background: rgba(13, 8, 5, 0.6);
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 0.72rem;
    line-height: 1.7;
    overflow-x: auto;
}
.mini .err { color: #f87171; }
.msg .ok   { color: #4ade80; font-family: var(--font-code); font-size: 0.85em; }

.agent-side { display: flex; flex-direction: column; gap: 1.4rem; }
.agent-step { display: flex; gap: 1rem; font-size: 0.94rem; color: var(--text-2); }
.agent-step strong { color: var(--text-1); }
.step-n {
    flex: 0 0 auto;
    width: 28px; height: 28px;
    display: grid; place-items: center;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--gold);
    border: 1px solid rgba(251, 191, 36, 0.35);
    border-radius: 8px;
}

.terminal {
    background: rgba(13, 8, 5, 0.7);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 1rem 1.2rem;
    font-family: var(--font-code);
    font-size: 0.8rem;
    line-height: 1.9;
    color: var(--text-2);
    overflow-x: auto;
}
.terminal .prompt { color: var(--gold); margin-right: 0.4rem; }

.agent-note { font-size: 0.85rem; color: var(--text-3); font-style: italic; }

/* ── Demo video ─────────────────────────────────────────────────── */
.video-embed { max-width: 900px; margin: 4.5rem auto 0; }
.video-embed .code-window { padding: 0; overflow: hidden; }
.video-frame {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--night-0);
}
.video-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}
.video-caption {
    margin: 1.1rem auto 0;
    max-width: 640px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-3);
}

/* ── Modules ────────────────────────────────────────────────────── */

.modules {
    max-width: 760px;
    margin: 0 auto;
    border: 1px solid var(--line);
    border-radius: var(--r);
    overflow: hidden;
    background: var(--panel);
}
.module {
    display: flex;
    gap: 1.6rem;
    align-items: baseline;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--line);
    transition: background 0.2s ease;
}
.module:last-child { border-bottom: none; }
.module:hover { background: rgba(255, 178, 107, 0.04); }
.module > code {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--ember-1);
    min-width: 14.5em;
}
.module span { color: var(--text-2); font-size: 0.9rem; }

/* ── Banner / get started ───────────────────────────────────────── */

.banner {
    position: relative;
    text-align: center;
    padding: 4.5rem 2rem;
    border: 1px solid var(--line);
    border-radius: 20px;
    background:
        radial-gradient(60% 120% at 50% 0%, rgba(249, 115, 22, 0.10), transparent 70%),
        radial-gradient(50% 100% at 80% 100%, rgba(251, 191, 36, 0.07), transparent 70%),
        var(--panel);
    overflow: hidden;
}

.code-copy {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: rgba(13, 8, 5, 0.75);
    border: 1px solid var(--line);
    padding: 0.9rem 1.3rem;
    border-radius: 10px;
    max-width: 540px;
    margin: 2rem auto 1.6rem;
}
.code-copy code { font-family: var(--font-code); font-size: 0.88rem; color: var(--ember-1); }

.banner-links { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; }
.banner-links a {
    color: var(--text-2);
    font-size: 0.9rem;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.banner-links a:hover { color: var(--ember-1); border-bottom-color: var(--ember-1); }

/* ── Footer ─────────────────────────────────────────────────────── */

footer {
    text-align: center;
    padding: 2.5rem 2rem;
    border-top: 1px solid var(--line);
    color: var(--text-3);
    font-size: 0.85rem;
}
footer em { color: var(--ember-1); }

/* ── Reveal on scroll ───────────────────────────────────────────── */

/* Hidden-until-revealed applies only when JS is confirmed running (html.js set
   by an inline script) — a failed script.js can never blank the page. */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease-out, transform 0.7s ease-out; }
.js .reveal.show { opacity: 1; transform: none; }

/* The animated windows are JS-populated; without JS, hide the empty shells. */
html:not(.js) .hero-visual,
html:not(.js) .chat-window { display: none; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal { opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}

/* ── Responsive ─────────────────────────────────────────────────── */

@media (max-width: 980px) {
    .hero { grid-template-columns: 1fr; gap: 3rem; padding-top: 1rem; }
    .agent-layout { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
    .nav-links a:not(.btn) { display: none; }
    main { padding-top: 7rem; }
    section { margin-bottom: 6rem; }
    .module { flex-direction: column; gap: 0.2rem; }
    .module > code { min-width: 0; }
    .code-copy { flex-direction: column; }
    .trace { font-size: 0.72rem; }
}