/* =========================================
   REBEL LABS - AI RESEARCH LAB
   Clean, Minimal, Academic Aesthetic
   ========================================= */

/* CSS Custom Properties */
:root {
    /* Dark Theme Colors */
    --color-bg: #0a0a0a;
    --color-bg-alt: #141414;
    --color-surface: #111111;
    --color-border: #262626;

    --color-text: #fafafa;
    --color-text-secondary: #a3a3a3;
    --color-text-muted: #737373;

    /* Accent */
    --color-accent: #ef4444;
    --color-accent-hover: #f87171;

    /* Typography */
    --font-serif: 'Newsreader', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
    --space-xl: 6rem;
    --space-2xl: 10rem;

    /* Container */
    --container-max: 720px;
    --container-wide: 1100px;

    /* Transitions */
    --transition: 200ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 18px;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Selection */
::selection {
    background: rgba(239, 68, 68, 0.3);
    color: var(--color-text);
}

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

/* =========================================
   TYPOGRAPHY
   ========================================= */

h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    color: var(--color-text-secondary);
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent);
}

/* =========================================
   NAVIGATION
   ========================================= */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 60px;
    padding: 0 var(--space-md);
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    overflow: visible;
}

.nav-inner {
    max-width: var(--container-wide);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    margin-left: -10rem;
}

.nav-logo-img {
    height: 240px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-right: -6rem;
}

.nav-link {
    font-size: 0.875rem;
    color: var(--color-text);
}

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

/* =========================================
   HERO SECTION
   ========================================= */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.hero-eyebrow {
    font-size: 0.875rem;
    font-weight: 500;
    color: #ef4444;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.02em;
}

.hero-title {
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 1.5rem;
    background: var(--color-text);
    color: var(--color-bg);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 6px;
    transition: background var(--transition);
}

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 1.5rem;
    background: transparent;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: border-color var(--transition);
}

.btn-secondary:hover {
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

/* =========================================
   CLI SECTION
   ========================================= */

.cli-section {
    padding: var(--space-xl) 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.rebelai-hero {
    padding-top: 120px;
    padding-bottom: var(--space-xl);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.cli-description {
    margin-bottom: var(--space-lg);
}

.terminal {
    background: #1a1a1a;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: var(--space-lg);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    font-size: 0.9rem;
    position: relative;
}

.terminal-copyable {
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.terminal-copyable:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.terminal-copy-hint {
    position: absolute;
    bottom: 10px;
    right: 16px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.terminal-copyable:hover .terminal-copy-hint {
    opacity: 1;
}

.terminal-copyable.copied .terminal-copy-hint {
    color: #28c840;
}

.terminal-header {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: #2a2a2a;
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #3a3a3a;
}

.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-body {
    padding: 20px;
}

.terminal-line {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
    color: #e5e5e5;
}

.terminal-line:last-child {
    margin-bottom: 0;
}

.terminal-prompt {
    color: #28c840;
    user-select: none;
}

.terminal-command {
    color: #fff;
}

.terminal-output {
    color: #888;
    padding-left: 20px;
}

.cli-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.cli-step {
    display: flex;
    gap: var(--space-sm);
}

.step-number {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-text);
    color: var(--color-bg);
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: 600;
}

.step-content h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.step-content p {
    font-size: 0.875rem;
    line-height: 1.5;
}

.step-content code {
    background: var(--color-bg-alt);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 0.8rem;
}

/* =========================================
   FEATURES SECTION
   ========================================= */

.features-section {
    padding: var(--space-xl) 0;
    background: var(--color-bg);
}

.section-subtitle {
    margin-top: calc(var(--space-sm) * -1);
    margin-bottom: var(--space-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.feature-card {
    padding: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color var(--transition);
}

.feature-card:hover {
    border-color: var(--color-text-muted);
}

.feature-number {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.feature-card h3 {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.feature-card p {
    font-size: 0.9rem;
    line-height: 1.6;
}

.features-prose {
    max-width: var(--container-max);
}

.features-prose p {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.features-prose p:last-child {
    margin-bottom: 0;
}

.features-prose em {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--color-text);
}

/* =========================================
   INTEGRATIONS SECTION
   ========================================= */

.integrations-section {
    padding: var(--space-xl) 0;
    background: var(--color-bg);
}

.integrations-section .section-title {
    text-align: center;
}

.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.integrations-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.integrations-tabs {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.integration-tab {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
    background: transparent;
    border: 1px solid var(--color-border);
    border-bottom: none;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.integration-tab:last-child {
    border-bottom: 1px solid var(--color-border);
}

.integration-tab:hover {
    background: var(--color-surface);
}

.integration-tab.active {
    background: var(--color-surface);
    border-left: 3px solid var(--color-accent);
}

.tab-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.tab-description {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    display: none;
}

.integration-tab.active .tab-description {
    display: block;
    color: var(--color-text-secondary);
}

.integrations-demo {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

.demo-content {
    display: none;
    height: 100%;
}

.demo-content.active {
    display: block;
}

.demo-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.demo-button {
    position: absolute;
    bottom: 20px;
    right: 20px;
    padding: 12px 28px;
    background: var(--color-accent);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.2s ease, transform 0.2s ease;
}

.demo-button:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.demo-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 350px;
    text-align: center;
}

.demo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.demo-placeholder p {
    max-width: 400px;
    font-size: 0.95rem;
    line-height: 1.7;
}

@media (max-width: 768px) {
    .integrations-layout {
        grid-template-columns: 1fr;
    }

    .integrations-tabs {
        flex-direction: row;
        overflow-x: auto;
    }

    .integration-tab {
        border: 1px solid var(--color-border);
        border-radius: 6px;
        min-width: 150px;
    }

    .integration-tab:last-child {
        border-bottom: 1px solid var(--color-border);
    }

    .integration-tab.active {
        border-left: 1px solid var(--color-border);
        border-top: 3px solid var(--color-accent);
    }

    .tab-description {
        display: none !important;
    }

    .integrations-demo {
        min-height: 300px;
    }

    .demo-placeholder {
        height: 250px;
    }
}

/* =========================================
   PROBLEM SECTION
   ========================================= */

.problem-section {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.problem-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.problem-list p {
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.problem-list ul {
    list-style: none;
    padding: 0;
}

.problem-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.problem-list li::before {
    content: "×";
    position: absolute;
    left: 0;
    color: #ef4444;
    font-weight: 600;
}

.solution-flow p {
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.flow-diagram {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
}

.flow-diagram span:not(.flow-arrow) {
    padding: 0.5rem 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.flow-arrow {
    color: var(--color-text-muted);
}

/* =========================================
   RESEARCH SECTION
   ========================================= */

.research-section {
    padding: var(--space-xl) 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.research-card {
    padding: var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color var(--transition);
}

.research-card:hover {
    border-color: var(--color-text-muted);
}

.research-card h3 {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.research-card p {
    font-size: 0.9rem;
    line-height: 1.6;
}

/* =========================================
   TEAM SECTION
   ========================================= */

.team-section {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.team-description {
    margin-bottom: var(--space-sm);
}

.team-description:last-child {
    margin-bottom: 0;
}

/* =========================================
   JOIN SECTION
   ========================================= */

.join-section {
    padding: var(--space-xl) 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.join-description {
    margin-bottom: var(--space-md);
}

.join-cta {
    margin-top: var(--space-md);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--color-accent);
}

.link-arrow svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition);
}

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

.link-arrow:hover svg {
    transform: translateX(4px);
}

/* =========================================
   CONTACT SECTION
   ========================================= */

.contact-section {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.contact-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-text h2 {
    margin-bottom: var(--space-xs);
}

.contact-text p {
    font-size: 0.95rem;
}

.contact-form {
    display: flex;
    gap: var(--space-xs);
    max-width: 400px;
}

.form-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition);
}

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

.form-input:focus {
    border-color: var(--color-text-muted);
}

.form-button {
    padding: 0.75rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--color-text);
    border: none;
    border-radius: 6px;
    color: var(--color-bg);
    cursor: pointer;
    transition: background var(--transition);
}

.form-button:hover {
    background: var(--color-accent);
}

/* =========================================
   FOOTER
   ========================================= */

.footer {
    margin-top: var(--space-xl);
    padding: var(--space-sm) 0 var(--space-xs);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-xl);
    padding-bottom: var(--space-sm);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo-img {
    height: 200px;
    width: auto;
    display: block;
    margin-bottom: 0;
}

.footer-tagline {
    font-size: 0.9rem;
    font-style: normal;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.footer-columns {
    display: flex;
    gap: 6rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
}

.footer-column h4 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.footer-column a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

.footer-column a:hover {
    color: var(--color-text);
}

.footer-bottom {
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* =========================================
   ANIMATIONS
   ========================================= */

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   RESPONSIVE
   ========================================= */

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }

    :root {
        --space-xl: 4rem;
        --space-2xl: 6rem;
    }

    .nav-links {
        display: none;
    }

    .research-grid {
        grid-template-columns: 1fr;
    }

    .cli-steps {
        grid-template-columns: 1fr;
    }

    .terminal {
        font-size: 0.8rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .problem-content {
        grid-template-columns: 1fr;
    }

    .flow-diagram {
        font-size: 0.8rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-md);
    }

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

    .form-button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
}

/* =========================================
   REDUCED MOTION
   ========================================= */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}