/* Confine — Premium Design System
   Inspired by Anthropic: warm tones, reveal effects, serif/sans mix */

@import url('https://fonts.googleapis.com/css2?family=Hedvig+Letters+Serif:wght@400&family=Instrument+Sans:wght@400;500;600;700&display=swap');

:root {
    --bg: #F5F3EF;
    --bg-alt: #EDEAE4;
    --bg-dark: #1A1A1A;
    --text: #1C1917;
    --text-muted: #6B6560;
    --text-light: #A8A29E;
    --border: #E8E6E1;
    --accent: #1C1917;
    --accent-hover: #3D3A36;
    --red: #D93025;
    --code-bg: #1E1E1E;
    --code-text: #E5E5E5;

    --sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --serif: 'Hedvig Letters Serif', Georgia, serif;

    --radius: 16px;
    --radius-lg: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background: rgba(28, 25, 23, 0.15);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(245, 243, 239, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    transition: var(--transition);
}

.nav-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 18px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 17px;
    letter-spacing: -0.01em;
}

.logo-icon {
    height: 28px;
    width: auto;
    transition: transform var(--transition);
}

.logo-wordmark {
    height: 27px;
    width: auto;
}

.logo:hover .logo-icon {
    transform: scale(1.06);
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    transition: color var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--text);
    transition: width var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 9999px;
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary .arrow {
    transition: transform var(--transition);
}

.btn-primary:hover .arrow {
    transform: translateX(4px);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-alt);
    border-color: var(--text-light);
}

.btn-large {
    padding: 16px 32px;
    font-size: 15px;
}

/* Hero */
.hero {
    position: relative;
    padding: 180px 32px 140px;
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 100px;
    align-items: center;
}

.hero h1 {
    font-family: var(--serif);
    font-size: 56px;
    font-weight: 500;
    line-height: 1.12;
    letter-spacing: -0.025em;
    margin-bottom: 28px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-muted);
    line-height: 1.75;
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 16px;
}

/* Code Card with 3D tilt effect */
.hero-visual {
    perspective: 1000px;
}

.code-card {
    background: var(--code-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.04),
        0 24px 60px rgba(0, 0, 0, 0.18);
    transform-style: preserve-3d;
    will-change: transform;
    transition: transform 0.15s cubic-bezier(0.33, 1, 0.68, 1), box-shadow 0.3s ease;
}

.code-card:hover {
    box-shadow:
        0 8px 16px rgba(0, 0, 0, 0.08),
        0 32px 80px rgba(0, 0, 0, 0.24);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 18px;
    background: #141414;
    border-bottom: 1px solid #2A2A2A;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #FF5F57;
}

.dot.yellow {
    background: #FFBD2E;
}

.dot.green {
    background: #28C840;
}

.filename {
    margin-left: 12px;
    color: #888;
    font-size: 12px;
    font-family: 'SF Mono', Monaco, 'Fira Code', monospace;
}

.code-content {
    padding: 24px;
    font-family: 'SF Mono', Monaco, 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.75;
    color: var(--code-text);
    overflow-x: auto;
}

.diff-remove {
    color: #FF8B8B;
    background: rgba(255, 95, 87, 0.12);
    display: block;
    margin: 0 -24px;
    padding: 0 24px;
}

.confine-comment {
    background: #FAFAF9;
    margin: 16px;
    padding: 18px 20px;
    border-radius: 12px;
    animation: fadeSlideIn 0.5s ease forwards;
    animation-delay: 0.5s;
    opacity: 0;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 12px;
    color: var(--text);
}

.confine-comment p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.65;
    font-family: var(--sans);
}

.confine-comment code {
    background: var(--bg-alt);
    padding: 3px 7px;
    border-radius: 5px;
    font-size: 11px;
    font-family: 'SF Mono', Monaco, monospace;
}

.suggested-fix {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    font-size: 13px;
}

.fix-label {
    color: var(--text-light);
    margin-right: 8px;
}

/* Dark Section (sharp corners) */
.section-dark {
    background: var(--bg-dark);
    color: white;
    margin-top: -24px;
    position: relative;
    z-index: 2;
    overflow: hidden;
}

#life-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.15;
    pointer-events: none;
}

.section-dark h2 {
    color: white;
}

.section-dark .step-number {
    background: white;
    color: var(--bg-dark);
    transition: all 0.3s ease;
    cursor: pointer;
}

.section-dark .step:hover .step-number {
    background: var(--red);
    color: white;
    box-shadow:
        0 0 20px rgba(217, 48, 37, 0.6),
        0 0 40px rgba(217, 48, 37, 0.4),
        0 0 60px rgba(217, 48, 37, 0.2);
    transform: scale(1.05);
}

.section-dark .step p,
.section-dark .step h3 {
    color: rgba(255, 255, 255, 0.85);
}

.section-dark .step h3 {
    color: white;
}

/* Sections */
.section {
    padding: 120px 32px;
    position: relative;
    overflow: hidden;
}

#glider-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.2;
    pointer-events: none;
}

.section-alt {
    background: var(--bg-alt);
}

.section-content {
    max-width: 1100px;
    margin: 0 auto;
}

.section h2 {
    font-family: var(--serif);
    font-size: 42px;
    font-weight: 500;
    text-align: center;
    margin-bottom: 72px;
    letter-spacing: -0.02em;
}

/* Steps */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 56px;
}

.step {
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
    margin: 0 auto 24px;
    transition: transform var(--transition);
}

.step:hover .step-number {
    transform: scale(1.1);
}

.step-latin {
    font-family: var(--serif);
    font-style: italic;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.step h3 {
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 14px;
    letter-spacing: -0.01em;
}

.step p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 1fr;
    gap: 48px 56px;
}

.feature {
    padding: 32px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: white;
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    cursor: default;
    display: flex;
    flex-direction: column;
    min-height: 180px;
}

.feature:hover {
    border-color: var(--text-light);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.feature h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.feature p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* Pixel Art Icons */
.pixel-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 16px;
    image-rendering: pixelated;
}

.pixel-brain {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 15px / 3px 3px no-repeat;
}

.pixel-eye {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 15px / 3px 3px no-repeat;
}

.pixel-chart {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 3px / 3px 3px no-repeat;
}

.pixel-wrench {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 18px / 3px 3px no-repeat;
}

.pixel-coin {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 0 / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 6px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 9px 18px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 12px 18px / 3px 3px no-repeat;
}

.pixel-code {
    background:
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 3px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 6px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 9px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 0 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 18px 12px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 3px 15px / 3px 3px no-repeat,
        linear-gradient(to right, var(--text) 3px, transparent 3px) 15px 15px / 3px 3px no-repeat;
}

/* Waitlist */
.waitlist-content {
    text-align: center;
}

.waitlist-content>p {
    color: var(--text-muted);
    font-size: 18px;
    margin-bottom: 40px;
}

.waitlist-form {
    display: flex;
    gap: 12px;
    justify-content: center;
    max-width: 440px;
    margin: 0 auto;
}

.waitlist-form input {
    flex: 1;
    padding: 16px 20px;
    border: 1.5px solid var(--border);
    border-radius: 9999px;
    font-size: 15px;
    font-family: inherit;
    background: white;
    transition: all var(--transition);
}

.waitlist-form input:focus {
    outline: none;
    border-color: var(--text);
    box-shadow: 0 0 0 4px rgba(28, 25, 23, 0.08);
}

.waitlist-form input::placeholder {
    color: var(--text-light);
}

.waitlist-note {
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-light);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 48px 32px;
    background: var(--bg);
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 15px;
}

.footer-wordmark {
    height: 16px;
    width: auto;
}

.footer-text {
    color: var(--text-muted);
    font-size: 14px;
}

/* Scroll reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays for children */
.step.reveal {
    transition-delay: inherit;
}

.feature.reveal {
    transition:
        opacity 0.8s ease,
        transform 0.8s ease,
        border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transition-delay: inherit;
}

/* Responsive */
@media (max-width: 1000px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 72px;
        padding-top: 140px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .code-card {
        transform: none;
    }

    .steps,
    .features {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .feature {
        padding: 24px;
    }

    .nav-links {
        display: none;
    }

    .waitlist-form {
        flex-direction: column;
    }

    .section {
        padding: 80px 24px;
    }
}