/* ============================================
   DEEP RESEARCH HUB - STYLESHEET
   Extends The Global Desk design system
   ============================================ */

:root {
    /* Inherited from Main Site */
    --bg-color: #050505;
    --card-bg: #0a0a0a;
    --text-main: #e0e0e0;
    --text-muted: #888;
    --accent-primary: #00f3ff;
    --accent-secondary: #ff003c;
    --accent-tertiary: #bbf7d0;
    --font-heading: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --glass-bg: rgba(5, 5, 5, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition-speed: 0.3s;
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Scanline Effect */
.scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0) 50%, rgba(0, 0, 0, 0.1) 50%, rgba(0, 0, 0, 0.1));
    background-size: 100% 4px;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.3;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    background: var(--accent-primary);
    z-index: 10000;
    width: 0%;
    transition: width 0.1s;
}

h1,
h2,
h3,
h4,
h5 {
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #fff;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   HEADER
   ============================================ */
.glass-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.back-link {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

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

.logo-text {
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: 0.1em;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    position: relative;
    color: var(--text-muted);
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-primary);
    transition: width var(--transition-speed);
}

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, #1a1a1a 0%, #000 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 243, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 243, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black 40%, transparent 80%);
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.overline {
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-size: 0.8rem;
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

h1.glitch {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.8rem 2rem;
    font-family: var(--font-mono);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-primary {
    background: var(--accent-primary);
    color: #000;
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
}

.btn-primary:hover {
    background: #fff;
    box-shadow: 0 0 25px rgba(0, 243, 255, 0.6);
    transform: translateY(-2px);
}

.btn-secondary {
    border-color: var(--text-muted);
    color: var(--text-main);
    background: transparent;
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.3);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: 6rem 0;
}

.dark-section {
    background: linear-gradient(180deg, var(--bg-color) 0%, #0a0a0a 100%);
}

.section-header {
    margin-bottom: 4rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-header h2 {
    font-size: 2rem;
    white-space: nowrap;
}

.section-header .line {
    height: 1px;
    background: var(--glass-border);
    width: 100%;
}

/* ============================================
   TOOLS GRID & CATEGORIES
   ============================================ */
.tool-category-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.5rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-btn:hover,
.category-btn.active {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(0, 243, 255, 0.05);
}

.category-block {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--glass-border);
    border-left: 3px solid var(--accent-primary);
    padding: 2rem;
    margin-bottom: 3rem;
    position: relative;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
}

.category-title h3 {
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.category-title p {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 600px;
}

.category-icon {
    font-size: 2rem;
    opacity: 0.5;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.tool-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    filter: grayscale(100%);
    transition: filter var(--transition-speed);
}

.tool-card:hover .tool-icon {
    filter: grayscale(0%);
}

.tool-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.tool-content p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    padding: 0.2rem 0.5rem;
    display: inline-block;
    margin-bottom: 1rem;
}

.feature-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.feature-list li {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.feature-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

.tool-link {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #fff;
    font-weight: 700;
    display: inline-block;
    transition: all var(--transition-speed);
}

.tool-link:hover {
    color: var(--accent-primary);
    margin-left: 5px;
}

/* ============================================
   KNOWLEDGE BASE GRID
   ============================================ */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.knowledge-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    transition: all var(--transition-speed);
}

.knowledge-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    background: rgba(0, 243, 255, 0.05);
}

.knowledge-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.knowledge-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.read-more {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #fff;
    font-weight: 700;
}

.read-more:hover {
    color: var(--accent-primary);
    margin-left: 5px;
}

/* ============================================
   CASE STUDIES
   ============================================ */
.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.case-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    transition: all var(--transition-speed);
}

.case-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.case-header h3 {
    font-size: 1.4rem;
}

.case-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    padding: 0.2rem 0.5rem;
    white-space: nowrap;
}

.case-excerpt {
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 2px solid var(--accent-primary);
    font-size: 0.95rem;
}

.case-techniques {
    list-style: none;
    margin-bottom: 1.5rem;
}

.case-techniques li {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.case-techniques li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ============================================
   QUICK REFERENCE BOX
   ============================================ */
.quick-ref-box {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
    border: 1px solid var(--glass-border);
    padding: 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.quick-ref-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
}

.quick-ref-box h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.quick-ref-box>p {
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.phases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.phase-item {
    text-align: center;
}

.phase-num {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
    opacity: 0.3;
}

.phase-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

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

/* ============================================
   FOOTER
   ============================================ */
footer {
    background: #000;
    border-top: 1px solid var(--glass-border);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h5 {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

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

.footer-col a {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    transition: color var(--transition-speed);
}

.footer-col a:hover {
    color: var(--accent-primary);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    h1.glitch {
        font-size: 2.5rem;
    }

    .tools-grid,
    .knowledge-grid,
    .case-studies-grid {
        grid-template-columns: 1fr;
    }

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

    .quick-ref-box {
        padding: 2rem;
    }

    .section {
        padding: 3rem 0;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        font-size: 0.8rem;
    }
}
/* Lucide Icon Sizing */
.tool-icon svg {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
}

.category-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 1.5;
}

.category-btn svg {
    width: 16px;
    height: 16px;
    stroke-width: 2;
}

/* Locked Card Styles */
.locked-card {
    opacity: 0.7;
    pointer-events: none;
}

.lock-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ef4444;
    backdrop-filter: blur(2px);
    border-radius: 4px;
}

.lock-overlay svg {
    width: 48px;
    height: 48px;
}