/* ═══════════════════════════════════════════════════════════════════════
   aura-lumen — design system
   Light, monochromatic, editorial. Inspired by arctop.com:
   warm paper background, near-black ink, hairline rules, big grotesk
   type, generous whitespace, one muted accent that shifts per emotion.
   ═══════════════════════════════════════════════════════════════════════ */

:root {
    /* paper & ink */
    --paper:      #faf9f6;
    --paper-soft: #f2f0ea;
    --ink:        #16140f;
    --ink-soft:   #5c594f;
    --ink-faint:  #a6a294;
    --hairline:   rgba(22, 20, 15, 0.14);

    /* emotional accents — sharper, well-separated hues that still sit on paper */
    --flow:       #4f46e5;   /* indigo  */
    --calm:       #0891b2;   /* cyan    */
    --focus:      #ea580c;   /* orange  */
    --excitement: #db2777;   /* magenta */
    --accent:     var(--flow);

    /* type */
    --font-display: "Space Grotesk", sans-serif;
    --font-body:    "Inter", sans-serif;
    --font-mono:    "IBM Plex Mono", monospace;

    /* rhythm */
    --gutter: clamp(1.25rem, 4vw, 4rem);
    --section-gap: clamp(6rem, 14vh, 11rem);
}

/* per-emotion accent, driven by body[data-emotion] */
body[data-emotion="flow"]       { --accent: var(--flow); }
body[data-emotion="calm"]       { --accent: var(--calm); }
body[data-emotion="focus"]      { --accent: var(--focus); }
body[data-emotion="excitement"] { --accent: var(--excitement); }

/* ── reset ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.65;
    color: var(--ink);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    transition: --accent 0.35s ease;
}

::selection { background: var(--accent); color: var(--paper); }

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.02em;
}

em { font-style: italic; }
a { color: inherit; }

.mono {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

/* ── scroll progress hairline ──────────────────────────────────────── */
.progress-track {
    position: fixed;
    inset: 0 0 auto 0;
    height: 2px;
    z-index: 200;
    background: transparent;
}
.progress-bar {
    height: 100%;
    width: 0;
    background: var(--accent);
    transition: background 0.35s ease;
}

/* ── navigation ────────────────────────────────────────────────────── */
.nav {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    background: color-mix(in srgb, var(--paper) 82%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--hairline); }

.nav-inner {
    max-width: 78rem;
    margin: 0 auto;
    padding: 1.1rem var(--gutter);
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
}
.brand-mark { width: 1.35rem; height: 1.35rem; color: var(--ink); }
.brand-wave {
    stroke-dasharray: 30;
    animation: wave-draw 4s ease-in-out infinite alternate;
}
@keyframes wave-draw {
    from { stroke-dashoffset: 30; }
    to   { stroke-dashoffset: 0; }
}
.brand-name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.2rem;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: 1.8rem;
    margin-left: auto;
}
.nav-links a {
    font-size: 0.92rem;
    text-decoration: none;
    color: var(--ink-soft);
    transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--ink); }

.nav-cta {
    font-size: 0.92rem;
    text-decoration: none;
    padding: 0.5rem 1.1rem;
    border: 1px solid var(--ink);
    border-radius: 999px;
    transition: background 0.25s ease, color 0.25s ease;
}
.nav-cta:hover { background: var(--ink); color: var(--paper); }

.nav-toggle { display: none; }

/* ── hero ──────────────────────────────────────────────────────────── */
.hero {
    max-width: 78rem;
    margin: 0 auto;
    padding: clamp(9rem, 22vh, 13rem) var(--gutter) 0;
    position: relative;
}

.kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-soft);
    border: 1px solid var(--hairline);
    border-radius: 999px;
    padding: 0.4rem 0.95rem;
    margin-bottom: 2.2rem;
}
.kicker-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    animation: kicker-pulse 2.4s ease-in-out infinite;
    transition: background 0.35s ease;
}
@keyframes kicker-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.4; transform: scale(0.7); }
}

.hero-title {
    font-size: clamp(2.9rem, 8.5vw, 7rem);
    max-width: 16ch;
}
.hero-title em { color: var(--accent); transition: color 0.35s ease; }

.hero-sub {
    max-width: 36rem;
    margin-top: 2rem;
    font-size: clamp(1.05rem, 1.4vw, 1.25rem);
    color: var(--ink-soft);
}

/* waitlist */
.waitlist {
    margin-top: 2.6rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    max-width: 30rem;
    position: relative;
}
.waitlist input {
    flex: 1 1 14rem;
    font: inherit;
    padding: 0.85rem 1.1rem;
    border: 1px solid var(--hairline);
    border-radius: 999px;
    background: transparent;
    color: var(--ink);
    outline: none;
    transition: border-color 0.2s ease;
}
.waitlist input:focus { border-color: var(--ink); }
.waitlist button {
    font: inherit;
    font-size: 0.95rem;
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: 999px;
    background: var(--ink);
    color: var(--paper);
    cursor: pointer;
    transition: background 0.25s ease;
}
.waitlist button:hover { background: var(--accent); }

.field-error, .field-success {
    flex-basis: 100%;
    display: none;
    font-size: 0.85rem;
}
.field-error   { color: #b3402e; }
.field-success { color: #2e8b6b; }

/* hero signal — bidirectional loop */
.hero-signal {
    margin-top: clamp(3rem, 8vh, 5.5rem);
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
}
.signal-legend {
    display: flex;
    gap: 1.6rem;
    padding: 0.7rem 0 0.2rem;
}
.signal-legend .mono { display: inline-flex; align-items: center; gap: 0.45rem; }
.sig-key {
    width: 14px; height: 2px; border-radius: 2px;
    display: inline-block;
}
.sig-in  { background: var(--accent); transition: background 0.4s ease; }
.sig-out {
    background: repeating-linear-gradient(90deg,
        var(--ink-soft) 0 4px, transparent 4px 7px);
}
#signal-canvas {
    display: block;
    width: 100%;
    height: 150px;
}
.signal-meta {
    display: flex;
    justify-content: space-between;
    padding: 0.55rem 0 0.7rem;
}

.hero-scroll {
    display: inline-block;
    margin: 1.4rem 0 0;
    text-decoration: none;
}

/* ── ticker ────────────────────────────────────────────────────────── */
.ticker {
    overflow: hidden;
    border-bottom: 1px solid var(--hairline);
    margin-top: var(--section-gap);
    padding: 1.1rem 0;
    white-space: nowrap;
}
.ticker-track {
    display: inline-block;
    animation: ticker-scroll 36s linear infinite;
}
.ticker-track span {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--ink-soft);
}
.ticker-track i {
    font-style: normal;
    margin: 0 1.6rem;
    color: var(--accent);
    transition: color 0.35s ease;
}
@keyframes ticker-scroll {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}

/* ── three-pillar band ─────────────────────────────────────────────── */
.pillars {
    max-width: 78rem;
    margin: clamp(4rem, 9vh, 7rem) auto 0;
    padding: 0 var(--gutter);
}
.pillars-lede {
    display: block;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--ink);
    margin-bottom: 0;
}
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}
.pillar {
    position: relative;
    padding: 2.2rem 1.8rem 2.4rem 0;
    border-bottom: 1px solid var(--hairline);
}
.pillar + .pillar { padding-left: 1.8rem; }
.pillars-grid .pillar:not(:last-child) { border-right: 1px solid var(--hairline); }
/* connective node-and-edge between pillars: the loop made literal */
.pillar:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 2.7rem; right: -4px;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--paper);
    border: 1px solid var(--accent);
    transition: border-color 0.4s ease;
}
.pillar-tag { display: block; color: var(--accent); transition: color 0.4s ease; }
.pillar h3 { font-size: 1.4rem; margin: 1rem 0 0.7rem; }
.pillar p { color: var(--ink-soft); font-size: 0.97rem; }

/* ── sections ──────────────────────────────────────────────────────── */
.section {
    max-width: 78rem;
    margin: var(--section-gap) auto 0;
    padding: 0 var(--gutter);
}

.section-head {
    display: grid;
    grid-template-columns: 4.5rem 1fr;
    gap: 1rem;
    align-items: start;
    margin-bottom: clamp(2.8rem, 6vh, 4.5rem);
}
.index {
    padding-top: 0.7rem;
    border-top: 1px solid var(--ink);
}
.section-head h2 {
    font-size: clamp(2rem, 4.6vw, 3.6rem);
    max-width: 18ch;
}
.section-head h2 em { color: var(--accent); transition: color 0.35s ease; }
.section-sub {
    grid-column: 2;
    margin-top: 1.2rem;
    max-width: 34rem;
    color: var(--ink-soft);
}

/* vision — editorial rows with hairlines */
.vision-grid { border-top: 1px solid var(--hairline); }
.vision-item {
    display: grid;
    grid-template-columns: 4.5rem 1fr 1.6fr;
    gap: 1rem 2.5rem;
    padding: 2.4rem 0;
    border-bottom: 1px solid var(--hairline);
    transition: padding-left 0.35s ease;
}
.vision-item:hover { padding-left: 0.9rem; }
.vision-item h3 { font-size: 1.45rem; }
.vision-item p { color: var(--ink-soft); }
.vision-item:hover .item-num { color: var(--accent); }
.item-num { transition: color 0.25s ease; }

/* ── scrollytelling ────────────────────────────────────────────────── */
.scrolly-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 6vw, 6rem);
    align-items: start;
}
.scrolly-visual {
    position: sticky;
    top: 16vh;
}
.orb-frame {
    border: 1px solid var(--hairline);
    border-radius: 1rem;
    padding: 1.2rem;
    background: var(--paper-soft);
}
#orb-canvas {
    display: block;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 0.6rem;
}
.orb-caption {
    display: block;
    text-align: center;
    padding-top: 0.9rem;
}

.scrolly-steps {
    display: flex;
    flex-direction: column;
    gap: clamp(5rem, 18vh, 11rem);
    padding: 12vh 0 18vh;
}
.step {
    border-left: 1px solid var(--hairline);
    padding-left: 1.6rem;
    opacity: 0.32;
    transition: opacity 0.45s ease, border-color 0.45s ease;
}
.step.active {
    opacity: 1;
    border-left-color: var(--accent);
}
.step h3 { font-size: 1.5rem; margin: 0.5rem 0 0.7rem; }
.step p { color: var(--ink-soft); }
.step-tag { color: var(--accent); transition: color 0.35s ease; }

/* ── lab ───────────────────────────────────────────────────────────── */
.lab {
    display: grid;
    grid-template-columns: minmax(13rem, 1fr) 2fr;
    gap: clamp(2rem, 5vw, 5rem);
    align-items: start;
}

.lab-controls {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--hairline);
}
.lab-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font: inherit;
    font-family: var(--font-display);
    font-size: 1.15rem;
    text-align: left;
    padding: 1.1rem 0.4rem;
    background: none;
    border: none;
    border-bottom: 1px solid var(--hairline);
    color: var(--ink-faint);
    cursor: pointer;
    transition: color 0.25s ease, padding-left 0.25s ease;
}
.lab-btn:hover { color: var(--ink-soft); }
.lab-btn.active { color: var(--ink); padding-left: 0.9rem; }
.lab-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    border: 1px solid currentColor;
    transition: background 0.25s ease;
}
.lab-btn.active .lab-dot { background: var(--accent); border-color: var(--accent); }

/* mock device */
.device {
    border: 1px solid var(--hairline);
    border-radius: 1.1rem;
    overflow: hidden;
    background: var(--paper-soft);
    box-shadow: 0 24px 60px -36px rgba(22, 20, 15, 0.28);
}
.device-bar {
    display: flex;
    justify-content: space-between;
    padding: 0.85rem 1.3rem;
    border-bottom: 1px solid var(--hairline);
}
.device-state { color: var(--accent); transition: color 0.35s ease; }

.device-body {
    position: relative;
    padding: 2.2rem 1.6rem 1.8rem;
    overflow: hidden;
}
.device-pulse {
    position: absolute;
    top: -70px; right: -70px;
    width: 220px; height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%);
    animation: device-breathe 5s ease-in-out infinite;
    transition: background 0.35s ease;
}
@keyframes device-breathe {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.18); }
}

.agent-row {
    position: relative;
    display: flex;
    gap: 0.9rem;
    align-items: flex-start;
}
.agent-chip {
    flex-shrink: 0;
    width: 2.1rem; height: 2.1rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    border: 1px solid var(--accent);
    color: var(--accent);
    transition: border-color 0.35s ease, color 0.35s ease;
}
.agent-line {
    font-size: 0.98rem;
    color: var(--ink-soft);
}
/* blinking generation caret, shown only while typing */
.agent-caret {
    align-self: stretch;
    width: 2px;
    margin-left: -0.5rem;
    margin-top: 0.15rem;
    height: 1.1em;
    background: var(--accent);
    opacity: 0;
    transition: background 0.4s ease;
}
.device.generating .agent-caret {
    opacity: 1;
    animation: caret-blink 0.9s steps(1) infinite;
}
.device.generating .agent-chip {
    animation: chip-think 1.1s ease-in-out infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }
@keyframes chip-think {
    0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 40%, transparent); }
    50%      { box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 0%, transparent); }
}

.device-metrics {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.8rem;
    margin-top: 2rem;
}
.metric {
    border: 1px solid var(--hairline);
    border-radius: 0.7rem;
    padding: 0.9rem 1rem;
    background: var(--paper);
}
.metric-val {
    display: block;
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 600;
}
.metric-lbl { display: block; margin-top: 0.2rem; }

/* ── agents grid ───────────────────────────────────────────────────── */
.agents-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--hairline);
    border-left: 1px solid var(--hairline);
}
.agent-card {
    padding: 2.2rem 1.8rem 2.6rem;
    border-right: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
    transition: background 0.3s ease;
}
.agent-card:hover { background: var(--paper-soft); }
.agent-card h3 { font-size: 1.3rem; margin: 1.4rem 0 0.7rem; }
.agent-card p { color: var(--ink-soft); font-size: 0.97rem; }

/* ── connect ───────────────────────────────────────────────────────── */
.connect-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(2.5rem, 6vw, 6rem);
    align-items: start;
}
.connect-intro h2 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    margin: 1rem 0 1.2rem;
}
.connect-intro .index { display: inline-block; }
.connect-intro p { color: var(--ink-soft); max-width: 26rem; }
.connect-mail {
    display: inline-block;
    margin-top: 1.6rem;
    text-decoration: none;
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 0.2rem;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.connect-mail:hover { color: var(--accent); border-color: var(--accent); }

.connect-form { display: flex; flex-direction: column; gap: 1.3rem; }
/* honeypot — visually and acoustically hidden, never shown to real users */
.hp {
    position: absolute !important;
    left: -9999px;
    width: 1px; height: 1px;
    opacity: 0;
    pointer-events: none;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.3rem;
}
.field label {
    display: block;
    font-size: 0.85rem;
    color: var(--ink-soft);
    margin-bottom: 0.45rem;
}
.field input,
.field select,
.field textarea {
    width: 100%;
    font: inherit;
    font-size: 0.98rem;
    color: var(--ink);
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--hairline);
    padding: 0.55rem 0.1rem;
    outline: none;
    border-radius: 0;
    transition: border-color 0.2s ease;
    resize: vertical;
}
.field input:focus,
.field select:focus,
.field textarea:focus { border-bottom-color: var(--ink); }

.check {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    font-size: 0.92rem;
    color: var(--ink-soft);
    cursor: pointer;
    user-select: none;
}
.check input { display: none; }
.check-box {
    width: 1.05rem; height: 1.05rem;
    border: 1px solid var(--ink-soft);
    border-radius: 0.25rem;
    display: inline-grid;
    place-items: center;
    transition: background 0.2s ease, border-color 0.2s ease;
}
.check input:checked + .check-box { background: var(--ink); border-color: var(--ink); }
.check input:checked + .check-box::after {
    content: "✓";
    color: var(--paper);
    font-size: 0.7rem;
    line-height: 1;
}

.submit {
    align-self: flex-start;
    font: inherit;
    padding: 0.85rem 2rem;
    border: none;
    border-radius: 999px;
    background: var(--ink);
    color: var(--paper);
    cursor: pointer;
    transition: background 0.25s ease;
}
.submit:hover:not(:disabled) { background: var(--accent); }
.submit:disabled { opacity: 0.55; cursor: wait; }

/* ── footer ────────────────────────────────────────────────────────── */
.footer {
    margin-top: var(--section-gap);
    border-top: 1px solid var(--hairline);
}
.footer-inner {
    max-width: 78rem;
    margin: 0 auto;
    padding: 2.2rem var(--gutter);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem 2.5rem;
}
.footer-left { display: flex; align-items: baseline; gap: 1rem; }
.footer-links { display: flex; gap: 1.4rem; margin-left: auto; }
.footer-links a {
    font-size: 0.9rem;
    color: var(--ink-soft);
    text-decoration: none;
}
.footer-links a:hover { color: var(--ink); }
.footer-copy { flex-basis: 100%; }

/* ── reveal-on-scroll ──────────────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: none;
}
/* keep scrolly step dimming logic in charge once revealed */
.step.reveal.visible { opacity: 0.32; }
.step.reveal.visible.active { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .ticker-track, .brand-wave, .kicker-dot, .device-pulse,
    .device.generating .agent-caret, .device.generating .agent-chip { animation: none; }
    html { scroll-behavior: auto; }
}

/* ── responsive ────────────────────────────────────────────────────── */
@media (max-width: 56rem) {
    .nav-links, .nav-cta { display: none; }
    .nav-toggle {
        display: flex;
        flex-direction: column;
        gap: 5px;
        margin-left: auto;
        background: none;
        border: none;
        padding: 0.4rem;
        cursor: pointer;
    }
    .nav-toggle span {
        width: 1.4rem; height: 1.5px;
        background: var(--ink);
        transition: transform 0.25s ease;
    }
    .nav.open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%; left: 0; right: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--hairline);
        padding: 1.2rem var(--gutter) 1.6rem;
        gap: 1.1rem;
        margin: 0;
    }
    .nav.open .nav-toggle span:first-child { transform: translateY(3.25px) rotate(45deg); }
    .nav.open .nav-toggle span:last-child  { transform: translateY(-3.25px) rotate(-45deg); }

    .section-head { grid-template-columns: 1fr; }
    .index { border-top: none; border-bottom: 1px solid var(--ink); padding: 0 0 0.5rem; width: 3rem; }
    .section-sub { grid-column: 1; }

    .pillars-grid { grid-template-columns: 1fr; }
    .pillar, .pillar + .pillar { padding: 1.8rem 0; }
    .pillars-grid .pillar:not(:last-child) { border-right: none; }
    .pillar:not(:last-child)::after { display: none; }

    .vision-item { grid-template-columns: 1fr; gap: 0.6rem; }
    .scrolly-layout { grid-template-columns: 1fr; }
    .scrolly-visual { position: relative; top: 0; }
    .scrolly-steps { padding: 3rem 0 1rem; gap: 3.5rem; }
    .lab { grid-template-columns: 1fr; }
    .lab-controls { flex-direction: row; flex-wrap: wrap; border-top: none; }
    .lab-btn { border-bottom: none; padding: 0.6rem 1rem 0.6rem 0; }
    .agents-grid { grid-template-columns: 1fr; }
    .connect-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}