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

:root {
    --color-primary: #0B0B0B;
    --color-bg: #FFFFFF;
    --color-accent: #2563EB;
    --color-text: #0B0B0B;
    --color-text-secondary: #6B7280;
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;
    --color-surface: #F9FAFB;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --font-body: 'IBM Plex Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Menlo', 'Monaco', monospace;
    --container-max: 1200px;
    --section-spacing: 88px;
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-theme="dark"] {
    --color-primary: #FFFFFF;
    --color-bg: #0B0B0B;
    --color-accent: #60A5FA;
    --color-text: #FFFFFF;
    --color-text-secondary: #9CA3AF;
    --color-border: #1F2937;
    --color-border-light: #111827;
    --color-surface: #111827;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    height: 72px;
    background: color-mix(in srgb, var(--color-bg) 92%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.site-header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 18px;
}

.logo-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 7px color-mix(in srgb, var(--color-accent) 18%, transparent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}

.nav-cta {
    background: var(--color-primary);
    color: var(--color-bg) !important;
    padding: 10px 22px;
    border-radius: 999px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: transform 0.2s var(--ease-out);
}

.theme-toggle:hover {
    transform: rotate(15deg);
}

.theme-icon-moon {
    display: none;
}

[data-theme="dark"] .theme-icon-sun {
    display: none;
}

[data-theme="dark"] .theme-icon-moon {
    display: block;
}

.nav-toggle {
    display: none;
    border: 0;
    background: none;
    width: 32px;
    height: 32px;
    cursor: pointer;
    gap: 6px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    border-radius: 2px;
    background: var(--color-primary);
}

.nav-toggle.active span:first-child {
    transform: translateY(4px) rotate(45deg);
}

.nav-toggle.active span:last-child {
    transform: translateY(-4px) rotate(-45deg);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99;
    background: var(--color-bg);
    padding: 30px 32px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.mobile-nav.open {
    opacity: 1;
    pointer-events: auto;
}

.mobile-nav-links a {
    display: block;
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 124px 0 80px;
}

.hero-split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: center;
}

.hero-content {
    max-width: 900px;
}

.hero-eyebrow,
.section-label {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
}

.hero-eyebrow {
    margin-bottom: 22px;
}

.hero-headline {
    font-family: var(--font-heading);
    font-size: clamp(44px, 5vw, 72px);
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 22px;
}

.hero-sub {
    max-width: 540px;
    color: var(--color-text-secondary);
    font-size: 18px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 14px 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s var(--ease-out), background 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

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

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

.btn:hover {
    transform: translateY(-1px);
}

.studio-terminal {
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
    color: #C7D2FE;
    overflow: hidden;
    box-shadow: 0 22px 50px rgba(2, 6, 23, 0.24);
}

.terminal-head {
    padding: 12px 14px;
    border-bottom: 1px solid rgba(148, 163, 184, 0.25);
    display: flex;
    gap: 8px;
}

.terminal-head span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #334155;
}

.terminal-head span:first-child {
    background: #F87171;
}

.terminal-head span:nth-child(2) {
    background: #FBBF24;
}

.terminal-head span:last-child {
    background: #4ADE80;
}

.terminal-body {
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.8;
    padding: 22px;
    white-space: pre-wrap;
}

.section {
    padding: var(--section-spacing) 0;
}

.section-heading {
    font-family: var(--font-heading);
    font-size: clamp(34px, 4vw, 52px);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-top: 10px;
}

.section-intro {
    margin-top: 16px;
    max-width: 760px;
    font-size: 18px;
    color: var(--color-text-secondary);
}

.architecture-grid,
.dev-platform-grid,
.research-grid,
.integrations-grid,
.workflow-steps {
    display: grid;
    gap: 20px;
    margin-top: 36px;
}

.architecture-grid,
.workflow-steps {
    grid-template-columns: repeat(2, 1fr);
}

.dev-platform-grid,
.research-grid,
.integrations-grid {
    grid-template-columns: repeat(3, 1fr);
}

.arch-block,
.dev-card,
.research-card,
.integration-card,
.workflow-card {
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 28px;
    background: var(--color-surface);
}

.arch-number,
.research-number,
.workflow-card span,
.dev-card-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 30px;
    border-radius: 999px;
    font-size: 12px;
    padding: 0 12px;
    background: color-mix(in srgb, var(--color-accent) 12%, transparent);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 16px;
}

.arch-content h3,
.dev-card h3,
.research-card h3,
.workflow-card h3,
.integration-card h3 {
    font-family: var(--font-heading);
    font-size: 24px;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.arch-content p,
.dev-card p,
.research-card p,
.workflow-card p,
.integration-card p {
    margin-top: 10px;
    color: var(--color-text-secondary);
}

.dev-features li {
    color: var(--color-text-secondary);
    position: relative;
    padding-left: 16px;
}

.dev-features li::before {
    content: "";
    position: absolute;
    top: 10px;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.cta-box {
    border: 1px solid var(--color-border);
    border-radius: 24px;
    padding: 44px;
    background: var(--color-primary);
    color: var(--color-bg);
    text-align: center;
}

.cta-box h2 {
    font-family: var(--font-heading);
    font-size: clamp(30px, 4vw, 48px);
    line-height: 1.1;
}

.cta-box p {
    margin: 16px auto 24px;
    max-width: 740px;
    color: color-mix(in srgb, var(--color-bg) 78%, transparent);
}

.cta-box .btn-primary {
    background: var(--color-bg);
    color: var(--color-primary);
}

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 24px 0 36px;
    color: var(--color-text-secondary);
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-card {
    position: relative;
    width: min(520px, calc(100% - 24px));
    margin: 9vh auto 0;
    padding: 24px;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 20px;
    cursor: pointer;
    line-height: 1;
}

.modal-card h3 {
    font-family: var(--font-heading);
    font-size: 28px;
    line-height: 1.2;
}

.modal-card p {
    margin-top: 8px;
    color: var(--color-text-secondary);
}

.modal-form {
    margin-top: 18px;
    display: grid;
    gap: 10px;
}

.modal-form label {
    display: grid;
    gap: 6px;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.modal-form input,
.modal-form textarea {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-family: inherit;
    font-size: 15px;
}

.modal-status {
    min-height: 20px;
    color: #15803D;
    font-size: 14px;
}

.modal-status.is-pending {
    color: #1D4ED8;
}

.modal-status.is-success {
    color: #15803D;
}

.modal-status.is-error {
    color: #B91C1C;
}

.modal-form .btn[disabled] {
    opacity: 0.65;
    cursor: not-allowed;
}

.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

.reveal:nth-child(2) { transition-delay: 0.06s; }
.reveal:nth-child(3) { transition-delay: 0.12s; }
.reveal:nth-child(4) { transition-delay: 0.18s; }
.reveal:nth-child(5) { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

}

@media (max-width: 1100px) {
    .hero-split,
    .architecture-grid,
    .dev-platform-grid,
    .research-grid,
    .workflow-steps,
    .integrations-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .nav-links,
    .theme-toggle {
        display: none;
    }

    .nav-toggle,
    .mobile-nav {
        display: flex;
    }
}

@media (max-width: 700px) {
    .container,
    .nav-container {
        padding: 0 18px;
    }

    .hero {
        padding: 112px 0 54px;
    }

    .btn {
        width: 100%;
    }

    .cta-box {
        padding: 32px 22px;
    }
}