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

:root {
    --bg: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f0;
    --text: #1a1a1a;
    --text-muted: #666;
    --border: #e0e0e0;
    --accent: #9333ea;
    --accent-hover: #7c3aed;
    --accent-glow: rgba(147, 51, 234, 0.15);
    --success: #16a34a;
    --error: #ef4444;
    --warn: #f59e0b;
    --btn-text: #fff;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .demo-stage__step { animation: none; }
    .demo-stage:not(.demo-stage--manual) .demo-stage__step--skill {
        opacity: 1;
        transform: none;
    }
    .demo-stage:not(.demo-stage--manual) .demo-stage__step:not(.demo-stage__step--skill) { display: none; }
    .demo-thinking-orbit,
    .demo-cursor,
    .demo-launch { animation: none; }
    .demo-stage__scene {
        animation: none;
        transition: none;
    }
}

html, body {
    min-height: 100vh;
}

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
}

/* Hero */
.hero-section {
    background-image: radial-gradient(circle, rgba(0,0,0,0.08) 1px, transparent 1px);
    background-size: 24px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 40px 100px;
    text-align: center;
}

.hero-center {
    max-width: 820px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 11px;
    padding: 5px 16px;
    border-radius: 20px;
    margin-bottom: 32px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

h1 {
    font-size: 52px;
    font-weight: 600;
    line-height: 1.15;
    margin-bottom: 28px;
}

h1 span {
    color: var(--accent);
}

h2 span {
    color: var(--accent);
}

.hero-sub {
    font-size: 19px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 48px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
    justify-content: center;
}

/* CTA */
.cta-btn {
    display: inline-block;
    background: #000;
    color: var(--btn-text);
    border: none;
    padding: 16px 36px;
    font-size: 15px;
    font-family: inherit;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

.cta-btn:hover {
    background: #222;
}

.cta-link {
    color: var(--text-muted);
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}

.cta-link:hover { color: var(--accent); }

/* Demo section */
.demo-section {
    padding: 80px 40px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.demo-heading {
    max-width: 960px;
    margin: 0 auto 40px;
    text-align: center;
}

.demo-heading h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
}

.demo-heading .section-intro {
    max-width: 720px;
    margin: 0 auto;
    font-size: 18px;
    line-height: 1.7;
}

.demo-wrap {
    max-width: 720px;
    margin: 0 auto;
}

.demo-stage {
    position: relative;
    height: 340px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
}

.demo-stage__step {
    position: absolute;
    inset: 0 0 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 14px;
    padding: 24px;
    opacity: 0;
    transform: translateY(12px);
    animation: demo-step 19s infinite;
}

.demo-stage__step--skill {
    animation-name: demo-step-first;
    animation-delay: 0s;
}
.demo-stage__step--chat-question { animation-delay: 3s; }
.demo-stage__step--chat-sent { animation-delay: 7s; }
.demo-stage__step--thinking { animation-delay: 11s; }
.demo-stage__step--result { animation-delay: 15s; }

@keyframes demo-step {
    0%, 21% { opacity: 1; transform: translateY(0); }
    21.06%, 100% { opacity: 0; transform: translateY(-12px); }
}

@keyframes demo-step-first {
    0%, 15.7% { opacity: 1; transform: translateY(0); }
    15.8%, 100% { opacity: 0; transform: translateY(-12px); }
}

.demo-skill-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
    width: min(100%, 510px);
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
}

.demo-skill-icon {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 18px;
    font-weight: 600;
}

.demo-skill-copy {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.demo-skill-copy span,
.demo-skill-copy small {
    color: var(--text-muted);
    font-size: 11px;
}

.demo-skill-copy strong {
    margin: 3px 0;
    color: var(--text);
    font-size: 15px;
}

.demo-launch {
    padding: 9px 13px;
    border-radius: 5px;
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    animation: demo-launch-click 19s infinite;
}

@keyframes demo-launch-click {
    0%, 8%, 12%, 100% {
        background: var(--accent);
        transform: scale(1);
    }
    10% {
        background: var(--accent-hover);
        transform: scale(0.94);
    }
}

.demo-cursor {
    position: absolute;
    right: 11px;
    bottom: 5px;
    z-index: 1;
    color: var(--text);
    font-family: sans-serif;
    font-size: 30px;
    line-height: 1;
    opacity: 0;
    text-shadow: 1px 1px 0 var(--bg);
    animation: demo-cursor-click 19s infinite;
}

@keyframes demo-cursor-click {
    0%, 4% { opacity: 0; transform: translate(32px, 36px); }
    7%, 9% { opacity: 1; transform: translate(0, 0); }
    10% { opacity: 1; transform: translate(3px, 4px) scale(0.9); }
    12%, 100% { opacity: 0; transform: translate(3px, 4px) scale(0.9); }
}

.demo-thinking-orbit {
    display: grid;
    place-items: center;
    width: 62px;
    height: 62px;
    border: 2px solid rgba(147, 51, 234, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: demo-spin 1.2s linear infinite;
}

.demo-thinking-orbit span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
}

@keyframes demo-spin {
    to { transform: rotate(360deg); }
}

.demo-stage__step--thinking strong,
.demo-result strong {
    color: var(--text);
    font-size: 17px;
}

.demo-result p {
    color: var(--text-muted);
    font-size: 13px;
}

.demo-result {
    width: min(100%, 400px);
    padding: 20px;
    border: 1px solid rgba(239, 68, 68, 0.25);
    border-radius: 8px;
    background: rgba(239, 68, 68, 0.05);
}

.demo-result__status {
    display: block;
    margin-bottom: 10px;
    color: var(--success);
    font-size: 11px;
    font-weight: 600;
}

.demo-result p { margin-top: 7px; }

.demo-bubble {
    max-width: min(100%, 360px);
    padding: 11px 15px;
    border-radius: 15px;
    color: var(--text);
    font-size: 13px;
}

.demo-message {
    display: flex;
    flex-direction: column;
    gap: 5px;
    max-width: min(100%, 360px);
}

.demo-message--skill { align-self: flex-start; }

.demo-message--client {
    align-self: flex-end;
    align-items: flex-end;
}

.demo-message__name {
    color: var(--text-muted);
    font-size: 10px;
}

.demo-bubble--question {
    align-self: flex-start;
    border: 1px solid var(--border);
    border-radius: 15px 15px 15px 4px;
    background: var(--bg-secondary);
}

.demo-bubble--answer {
    align-self: flex-end;
    background: var(--accent);
    border-radius: 15px 15px 4px;
    color: #fff;
}

.demo-stage__step--chat-question,
.demo-stage__step--chat-sent {
    justify-content: flex-start;
    padding-top: 50px;
}

.demo-stage__caption {
    position: absolute;
    bottom: 0;
    margin: 0;
    color: var(--text-muted);
    font-size: 13px;
}

.demo-stage__pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 7px;
    margin-top: 16px;
}

.demo-stage__scene {
    width: 7px;
    height: 7px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: var(--border);
    cursor: pointer;
    opacity: 0.75;
    transform: scaleY(0.85);
    transition:
        width 0.45s cubic-bezier(0.22, 1, 0.36, 1),
        background-color 0.35s ease,
        opacity 0.35s ease,
        transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.demo-stage__scene.is-passed,
.demo-stage__scene.is-current {
    background: #2563eb;
    opacity: 1;
}

.demo-stage__scene.is-current {
    width: 24px;
    transform: scaleY(1);
    animation: demo-scene-activate 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.demo-stage__scene:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.demo-stage--manual .demo-stage__step {
    animation: none;
    transition: opacity 0.35s ease, transform 0.35s ease;
}

.demo-stage--manual .demo-stage__step.is-active {
    opacity: 1;
    transform: translateY(0);
}

@keyframes demo-scene-activate {
    from { transform: scaleX(0.45) scaleY(0.8); }
    to { transform: scaleX(1) scaleY(1); }
}

@media (prefers-reduced-motion: reduce) {
    .demo-stage__scene,
    .demo-stage__scene.is-current {
        animation: none;
        transition: none;
    }
}

.demo-stage:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.cta-btn:focus-visible,
.cta-link:focus-visible,
footer a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* Content sections */
.content-section {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 40px;
}

.content-section--alt {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-inner {
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
}

.section-inner--wide {
    max-width: 960px;
}

.section-label {
    font-size: 11px;
    color: var(--accent);
    letter-spacing: 1px;
    margin-bottom: 16px;
    opacity: 0.7;
}

.content-section h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 24px;
    line-height: 1.2;
}

.section-intro {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 28px;
    line-height: 1.7;
}

.check-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 28px;
}

.check-list li {
    display: flex;
    align-items: baseline;
    gap: 14px;
    font-size: 17px;
    color: var(--text);
    line-height: 1.5;
}

.check-icon {
    color: var(--text-muted);
    font-size: 14px;
    flex-shrink: 0;
    width: 16px;
}

.check-icon.accent {
    color: var(--accent);
}

.section-note {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

/* Tags */
.pack-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
}

.pack-tag {
    display: inline-block;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 13px;
    padding: 8px 14px;
    border-radius: 20px;
}

/* What can be created — CSS Rubik's cube */
.create-section {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 48px;
    align-items: center;
}

.create-visual {
    width: 280px;
    height: 280px;
    display: grid;
    place-items: center;
    perspective: 700px;
}

.creator-cube {
    --cube-size: 200px;
    --cube-depth: 100px;
    position: relative;
    width: var(--cube-size);
    height: var(--cube-size);
    transform-style: preserve-3d;
    transform: rotateX(-28deg) rotateY(-42deg);
    animation: cube-float 5s ease-in-out infinite;
}

.creator-cube__face {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 4px;
    padding: 4px;
    background: #10110d;
    border: 1px solid #10110d;
    border-radius: 0;
}

.creator-cube__face--front {
    transform: translateZ(var(--cube-depth));
}

.creator-cube__face--right {
    transform: rotateY(90deg) translateZ(var(--cube-depth));
}

.creator-cube__face--top {
    transform: rotateX(90deg) translateZ(var(--cube-depth));
}

.cube-tile {
    display: block;
    border: 1px solid #1b1c16;
    border-radius: 3px;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.45);
    animation: cube-tile-twinkle var(--twinkle-duration, 13s) ease-in-out var(--twinkle-delay, 0s) infinite;
}

.cube-tile--peach { background: #ff8e6b; }
.cube-tile--mint { background: #5ce8bd; }
.cube-tile--blue { background: #6ab8ff; }
.cube-tile--lilac { background: #b876ff; }
.cube-tile--cream { background: #ffd252; }

.creator-cube__face--front .cube-tile:nth-child(1) { --twinkle-delay: -1.8s; --twinkle-duration: 12.7s; }
.creator-cube__face--front .cube-tile:nth-child(2) { --twinkle-delay: -9.4s; --twinkle-duration: 14.3s; }
.creator-cube__face--front .cube-tile:nth-child(3) { --twinkle-delay: -4.1s; --twinkle-duration: 13.6s; }
.creator-cube__face--front .cube-tile:nth-child(4) { --twinkle-delay: -11.2s; --twinkle-duration: 15.1s; }
.creator-cube__face--front .cube-tile:nth-child(5) { --twinkle-delay: -6.7s; --twinkle-duration: 12.9s; }
.creator-cube__face--front .cube-tile:nth-child(6) { --twinkle-delay: -0.3s; --twinkle-duration: 14.8s; }
.creator-cube__face--front .cube-tile:nth-child(7) { --twinkle-delay: -8.1s; --twinkle-duration: 13.3s; }
.creator-cube__face--front .cube-tile:nth-child(8) { --twinkle-delay: -3.0s; --twinkle-duration: 15.4s; }
.creator-cube__face--front .cube-tile:nth-child(9) { --twinkle-delay: -12.5s; --twinkle-duration: 14.1s; }
.creator-cube__face--right .cube-tile:nth-child(1) { --twinkle-delay: -5.3s; --twinkle-duration: 13.8s; }
.creator-cube__face--right .cube-tile:nth-child(2) { --twinkle-delay: -10.7s; --twinkle-duration: 15.2s; }
.creator-cube__face--right .cube-tile:nth-child(3) { --twinkle-delay: -2.5s; --twinkle-duration: 12.6s; }
.creator-cube__face--right .cube-tile:nth-child(4) { --twinkle-delay: -7.5s; --twinkle-duration: 14.6s; }
.creator-cube__face--right .cube-tile:nth-child(5) { --twinkle-delay: -13.1s; --twinkle-duration: 13.1s; }
.creator-cube__face--right .cube-tile:nth-child(6) { --twinkle-delay: -0.9s; --twinkle-duration: 15.5s; }
.creator-cube__face--right .cube-tile:nth-child(7) { --twinkle-delay: -6.1s; --twinkle-duration: 12.8s; }
.creator-cube__face--right .cube-tile:nth-child(8) { --twinkle-delay: -11.8s; --twinkle-duration: 14.4s; }
.creator-cube__face--right .cube-tile:nth-child(9) { --twinkle-delay: -3.7s; --twinkle-duration: 13.5s; }
.creator-cube__face--top .cube-tile:nth-child(1) { --twinkle-delay: -8.8s; --twinkle-duration: 15s; }
.creator-cube__face--top .cube-tile:nth-child(2) { --twinkle-delay: -1.2s; --twinkle-duration: 13.2s; }
.creator-cube__face--top .cube-tile:nth-child(3) { --twinkle-delay: -12.1s; --twinkle-duration: 14.9s; }
.creator-cube__face--top .cube-tile:nth-child(4) { --twinkle-delay: -4.8s; --twinkle-duration: 12.5s; }
.creator-cube__face--top .cube-tile:nth-child(5) { --twinkle-delay: -9.9s; --twinkle-duration: 15.3s; }
.creator-cube__face--top .cube-tile:nth-child(6) { --twinkle-delay: -2.1s; --twinkle-duration: 13.4s; }
.creator-cube__face--top .cube-tile:nth-child(7) { --twinkle-delay: -7.0s; --twinkle-duration: 14.7s; }
.creator-cube__face--top .cube-tile:nth-child(8) { --twinkle-delay: -11.4s; --twinkle-duration: 12.4s; }
.creator-cube__face--top .cube-tile:nth-child(9) { --twinkle-delay: -5.8s; --twinkle-duration: 15.6s; }

@keyframes cube-float {
    0%, 100% { transform: translateY(0) rotateX(-28deg) rotateY(-42deg); }
    50% { transform: translateY(-10px) rotateX(-28deg) rotateY(-42deg); }
}

@keyframes cube-tile-twinkle {
    0%, 4%, 100% { filter: brightness(1) saturate(1); }
    2% {
        filter: brightness(1.18) saturate(1.12);
        box-shadow: 0 1px 1px rgba(0, 0, 0, 0.45);
    }
}

@media (prefers-reduced-motion: reduce) {
    .creator-cube,
    .cube-tile { animation: none; }
}

/* Contrast grid */
.contrast-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}

.contrast-grid--triple {
    grid-template-columns: repeat(3, 1fr);
}

.contrast-col {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    background: var(--bg);
}

.contrast-col--visible {
    border-color: rgba(22, 163, 74, 0.25);
    background: rgba(22, 163, 74, 0.03);
}

.contrast-col--paid {
    border-color: rgba(147, 51, 234, 0.25);
    background: rgba(147, 51, 234, 0.03);
}

.contrast-col--referral {
    border-color: rgba(37, 99, 235, 0.25);
    background: rgba(37, 99, 235, 0.03);
}

.contrast-col--hidden {
    border-color: rgba(239, 68, 68, 0.2);
    background: rgba(239, 68, 68, 0.03);
}

.contrast-head {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    margin-bottom: 16px;
    color: var(--text);
}

.contrast-col--visible .contrast-head { color: var(--success); }
.contrast-col--paid .contrast-head { color: var(--accent); }
.contrast-col--referral .contrast-head { color: #2563eb; }
.contrast-col--hidden .contrast-head { color: var(--error); }

.contrast-row {
    font-size: 16px;
    line-height: 1.55;
    color: var(--text);
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.contrast-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* Steps */
.steps-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.steps-list li {
    display: flex;
    align-items: baseline;
    gap: 16px;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text);
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
}

/* Integrations */
.integrations-section {
    padding: 80px 40px;
}

.integrations-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 8px;
}

.integration-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    transition: border-color 0.2s;
}

.integration-item:hover {
    border-color: var(--accent);
}

.integration-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
}

.integration-logo img {
    width: 44px;
    height: 44px;
    object-fit: contain;
    display: block;
}

.integration-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
}

.integration-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Final CTA */
.cta-section {
    padding: 100px 40px;
    text-align: center;
    background: var(--bg);
    border-top: 1px solid var(--border);
}

.cta-inner {
    max-width: 640px;
    margin: 0 auto;
}

.cta-section h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.25;
}

.cta-section p {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 36px;
}

/* Footer */
footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px 72px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-left {
    color: var(--text-muted);
    font-size: 13px;
}

.footer-right a {
    color: var(--text-muted);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-right a:hover { color: var(--accent); }
.footer-sep { color: var(--text-muted); margin: 0 8px; }

/* Mobile */
@media (max-width: 720px) {
    .hero-section { padding: 80px 20px 60px; }
    h1 { font-size: 36px; }
    .hero-sub { font-size: 15px; }
    .content-section,
    .integrations-section,
    .demo-section { padding: 56px 20px; }
    .content-section h2,
    .cta-section h2,
    .demo-heading h2 { font-size: 26px; }
    .check-list li,
    .steps-list li { font-size: 15px; }
    .contrast-grid,
    .integrations-grid { grid-template-columns: 1fr; }
    .create-section {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .create-visual {
        --cube-size: 150px;
        --cube-depth: 75px;
        width: 220px;
        height: 220px;
        margin: 0 auto;
    }
    .creator-cube {
        --cube-size: 150px;
        --cube-depth: 75px;
    }
    .demo-stage {
        height: 320px;
    }
    .demo-stage__step {
        padding: 20px;
    }
    .demo-skill-card {
        padding: 16px;
        gap: 10px;
    }
    .demo-skill-icon {
        width: 32px;
        height: 32px;
        font-size: 15px;
    }
    .demo-skill-copy strong { font-size: 13px; }
    .demo-launch { padding: 8px 10px; }
    .cta-section { padding: 64px 20px; }
    footer {
        padding: 16px 20px 64px;
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}