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

:root {
    --color-bg: #f5f1e8;
    --color-text: #1a1a1a;
    --color-text-muted: #6a6a6a;
    --color-border: #2a2a2a;
    --color-border-light: #d4d4d4;

    --font-sans: 'Space Grotesk', -apple-system, sans-serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;

    --container-width: 1200px;
}

[data-theme="dark"] {
    --color-bg: #0a0a0a;
    --color-text: #f5f1e8;
    --color-text-muted: #a0a0a0;
    --color-border: #f5f1e8;
    --color-border-light: #3a3a3a;
}

* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    color: var(--color-text);
    background-color: var(--color-bg);
    position: relative;
}

/* No texture - clean technical */
.texture-overlay {
    display: none;
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 4rem;
}

/* Navigation */
.main-nav {
    padding: 2rem 0;
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--color-border);
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.theme-toggle {
    background: transparent;
    border: 2px solid var(--color-border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    padding: 0;
}

.theme-toggle:hover {
    border-color: var(--color-text);
}

.theme-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-text);
    transition: all 0.3s ease;
}

[data-theme="dark"] .theme-icon {
    background: var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-text);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    z-index: 1001;
}

.hamburger-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background 0.3s ease;
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.3s ease;
}

.hamburger-icon::before {
    top: -7px;
}

.hamburger-icon::after {
    top: 7px;
}

/* Animated hamburger to X */
.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon::before {
    transform: rotate(45deg) translateY(7px) translateX(6px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon::after {
    transform: rotate(-45deg) translateY(-7px) translateX(6px);
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-text);
    transition: width 0.3s ease;
}

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

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

/* Homepage Technical */
.homepage {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 0;
}

.grid-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.grid-line {
    position: absolute;
    background: var(--color-border-light);
    opacity: 0.15;
}

.grid-v-left {
    width: 1px;
    height: 100%;
    left: 15%;
}

.grid-v-right {
    width: 1px;
    height: 100%;
    right: 20%;
}

.grid-h-top {
    width: 100%;
    height: 1px;
    top: 25%;
}

.hero-technical {
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: 450px 1fr;
    gap: 8rem;
    align-items: center;
    overflow: visible;
}

.diagram-wrapper {
    position: relative;
    width: 100%;
}

.lottie-diagram {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid var(--color-border);
    padding: 2rem;
    overflow: hidden;
}

.layer-numbers {
    position: absolute;
    left: -45px;
    top: 2rem;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-end;
    z-index: 100;
    pointer-events: none;
}

.layer-numbers span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    font-weight: 700;
    letter-spacing: 0.05em;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    transform: translateX(0);
    opacity: 0.6;
    display: block;
}

.layer-numbers span.active {
    color: var(--color-text);
    transform: translateX(8px);
    opacity: 1;
    font-size: 0.85rem;
}

.lottie-diagram lottie-player {
    width: 100%;
    height: 100%;
}

.lottie-diagram:hover {
    cursor: crosshair;
}

.diagram-circle {
    position: absolute;
    top: -30px;
    left: -30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-text);
    border: 2px solid var(--color-border);
    transition: background-color 0.1s ease, border-color 0.3s ease;
}

/* Mobile stacked layers alternative */
.seven-layers-mobile {
    display: none;
}

.layer-stack {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 2rem 0;
}

.stack-layer {
    display: flex;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.4s ease;
}

.stack-layer.visible {
    opacity: 1;
    transform: translateX(0);
}

.stack-layer .layer-num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    width: 2rem;
    text-align: right;
}

.stack-layer .layer-bar {
    flex: 1;
    height: 8px;
    background: var(--color-border);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}

.stack-layer .layer-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background: var(--color-text);
    transition: width 0.6s ease;
    transition-delay: 0.2s;
}

/* Different widths for each layer when visible */
.stack-layer[data-layer="7"].visible .layer-bar::after { width: 95%; }
.stack-layer[data-layer="6"].visible .layer-bar::after { width: 85%; }
.stack-layer[data-layer="5"].visible .layer-bar::after { width: 75%; }
.stack-layer[data-layer="4"].visible .layer-bar::after { width: 65%; }
.stack-layer[data-layer="3"].visible .layer-bar::after { width: 55%; }
.stack-layer[data-layer="2"].visible .layer-bar::after { width: 45%; }
.stack-layer[data-layer="1"].visible .layer-bar::after { width: 35%; }

.layer-label {
    position: absolute;
    top: -40px;
    left: 40px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    white-space: nowrap;
}

.layer-label.visible {
    opacity: 1;
    transform: translateY(0);
}

.text-technical {
    position: relative;
}

.text-technical::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0;
    width: 2px;
    height: 100%;
    background: var(--color-text);
}

/* Typography */
.prose {
    font-size: 1rem;
    line-height: 1.65;
}

.prose h1 {
    font-family: var(--font-sans);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 2rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.prose h2 {
    font-family: var(--font-sans);
    font-size: 1.8rem;
    font-weight: 600;
    line-height: 1.2;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.prose h3 {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
}

.prose p {
    margin-bottom: 1.5rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.prose a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.prose a:hover {
    text-decoration: underline;
    text-decoration-thickness: 2px;
}

.prose ul,
.prose ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.prose li {
    margin-bottom: 0.5rem;
    color: var(--color-text-muted);
}

.prose strong {
    font-weight: 600;
    color: var(--color-text);
}

/* Page Content */
.page-content {
    padding: 6rem 0 8rem;
    position: relative;
}

.page-content .prose {
    max-width: 800px;
}

.page-content .prose::before {
    display: none;
}

/* Builder's Note Page */
.builders-note-page {
    height: calc(100vh - 100px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.builders-note-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.builders-note-header h1 {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 2rem;
    color: var(--color-text-muted);
}

.manifesto h2 {
    font-family: var(--font-sans);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2.5rem;
    color: var(--color-text);
    line-height: 1.2;
}

.principles {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.principles li {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: 1.5rem;
    align-items: baseline;
    margin-bottom: 1.2rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--color-border-light);
}

.principles li:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.principles .number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
}

.principles .text {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-text);
    line-height: 1.4;
}

/* Contact Page Layout */
.contact-page {
    height: calc(100vh - 100px);
    display: flex;
    align-items: center;
    padding: 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8rem;
    align-items: center;
    width: 100%;
}

.contact-info-section {
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-info h3 {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
}

.social-links {
    list-style: none;
    padding: 0;
}

.social-links li {
    margin-bottom: 1rem;
}

.social-links a {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 700;
    transition: all 0.2s ease;
    position: relative;
    padding-left: 1.5rem;
}

.social-links a::before {
    content: '→';
    position: absolute;
    left: 0;
    transition: transform 0.2s ease;
}

.social-links a:hover::before {
    transform: translateX(5px);
}

/* Products List */
.products-grid {
    margin-top: 6rem;
    display: grid;
    gap: 0;
}

.product-card {
    background: transparent;
    padding: 3rem 0;
    position: relative;
    border-top: 2px solid var(--color-border);
    transition: all 0.3s ease;
}

.product-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 0;
    background: var(--color-text);
    transition: height 0.3s ease;
}

.product-card:hover::before {
    height: 100%;
}

.product-card h2 {
    font-family: var(--font-sans);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.product-card h2::before {
    content: attr(data-index);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-text);
    font-weight: 700;
}

.product-card h2 a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

.product-card h2 a:hover {
    color: var(--color-text);
}

.product-card p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    max-width: 70ch;
    padding-left: 3rem;
}

.read-more {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-left: 3rem;
    transition: color 0.2s ease;
}

.read-more::after {
    content: ' →';
    color: var(--color-text);
}

.read-more:hover {
    color: var(--color-text);
}

/* Product Navigation */
.product-nav {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 2px solid var(--color-border);
}

.product-nav a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    transition: color 0.2s ease;
}

.product-nav a::before {
    content: '← ';
    color: var(--color-text);
}

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

/* Contact Form */
form {
    margin: 0;
    max-width: 600px;
    border: 2px solid var(--color-border);
    padding: 3rem;
    position: relative;
}

.contact-page form {
    max-width: 100%;
    padding: 2rem;
}

.contact-page form p {
    margin-bottom: 1.2rem;
}

.contact-page form textarea {
    min-height: 100px;
}

form::before {
    content: 'CONTACT';
    position: absolute;
    top: -12px;
    left: 2rem;
    background: var(--color-bg);
    padding: 0 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-text);
}

form p {
    margin-bottom: 2rem;
}

form label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

form input[type="text"],
form input[type="email"],
form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text);
    background: transparent;
    border: 2px solid var(--color-border);
    transition: all 0.2s ease;
}

form input[type="text"]:focus,
form input[type="email"]:focus,
form textarea:focus {
    outline: none;
    border-color: var(--color-text);
}

form textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

form button {
    padding: 0.85rem 2.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--color-bg);
    background: var(--color-text);
    border: 2px solid var(--color-text);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

form button:hover {
    background: transparent;
    color: var(--color-text);
}

form .hidden {
    display: none;
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 2px solid var(--color-border);
    margin-top: 8rem;
}

footer p {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-align: left;
    letter-spacing: 0.05em;
}

/* Horizontal Rule */
hr {
    border: none;
    border-top: 2px solid var(--color-border);
    margin: 3rem 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-technical {
        grid-template-columns: 400px 1fr;
        gap: 5rem;
    }

    .diagram-marks {
        left: -60px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 2rem;
    }

    .main-nav {
        padding: 1.5rem 0;
    }

    /* Mobile hamburger menu */
    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--color-bg);
        border-left: 2px solid var(--color-border);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        padding: 2rem;
        transition: right 0.3s ease;
        z-index: 1000;
        font-size: 0.9rem;
    }

    .nav-links.open {
        right: 0;
    }

    .theme-toggle {
        position: fixed;
        top: 2rem;
        right: 4rem;
        z-index: 1001;
    }

    .homepage {
        padding: 4rem 0;
    }

    .hero-technical {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    /* Hide desktop Lottie, show mobile stacked layers */
    .diagram-desktop {
        display: none;
    }

    .seven-layers-mobile {
        display: block;
    }

    .diagram-marks {
        display: none;
    }

    .lottie-diagram {
        max-width: 350px;
        margin: 0 auto;
    }

    .diagram-circle {
        width: 50px;
        height: 50px;
        top: -25px;
        left: -25px;
    }

    /* Reposition layer numbers horizontally on mobile */
    .layer-numbers {
        position: static;
        flex-direction: row;
        justify-content: space-around;
        margin-top: 1rem;
        padding: 0.75rem 0;
        border-top: 1px solid var(--color-border-light);
    }

    .layer-numbers span {
        font-size: 0.6rem;
    }

    .layer-numbers span.active {
        transform: translateY(-3px);
        font-size: 0.7rem;
    }

    .text-technical::before {
        display: none;
    }

    .prose h1 {
        font-size: 2rem;
    }

    .prose h2 {
        font-size: 1.5rem;
    }

    .product-card h2 {
        font-size: 1.6rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .product-card p,
    .read-more {
        padding-left: 0;
    }

    .page-content {
        padding: 4rem 0 6rem;
    }

    /* Contact page mobile layout */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .contact-page {
        height: auto;
        padding: 4rem 0;
    }

    form {
        padding: 2rem;
    }

    /* Builder's Note mobile adjustments */
    .builders-note-page {
        height: auto;
        min-height: calc(100vh - 100px);
        padding: 3rem 0;
    }

    .manifesto h2 {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }

    .grid-v-1,
    .grid-v-2 {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-logo {
        font-size: 0.7rem;
    }

    .nav-links {
        gap: 1.5rem;
        font-size: 0.65rem;
    }

    .prose h1 {
        font-size: 1.75rem;
    }

    .lottie-diagram {
        max-width: 280px;
    }

    /* Builder's Note smaller screens */
    .container {
        padding: 0 1.25rem;
    }

    .manifesto h2 {
        font-size: 1.5rem;
    }

    .principles li {
        grid-template-columns: 2rem 1fr;
        gap: 1rem;
        margin-bottom: 1rem;
        padding-bottom: 1rem;
    }

    .principles .text {
        font-size: 1rem;
    }
}

/* Very small phones */
@media (max-width: 360px) {
    .container {
        padding: 0 1rem;
    }

    .prose h1 {
        font-size: 1.5rem;
    }

    .prose h2 {
        font-size: 1.25rem;
    }

    .manifesto h2 {
        font-size: 1.25rem;
    }

    .homepage,
    .page-content {
        padding: 3rem 0;
    }
}