/* ============================================================
   DITHERED INTELLECT — Research Terminal Design System
   Neo-Brutalism + Retro-Tech | Achromatic | Grid-Locked
   ============================================================ */

/* ---- Google Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---- Design Tokens ---- */
:root {
    /* Surface */
    --color-canvas: #ffffff;
    --color-bg: #f9f9f9;
    --color-surface-low: #f3f3f3;
    --color-surface: #eeeeee;
    --color-surface-high: #e8e8e8;
    --color-surface-highest: #e2e2e2;
    --color-surface-dim: #dadada;

    /* Ink */
    --color-ink: #000000;
    --color-ink-soft: #1b1b1b;
    --color-secondary: #5e5e5e;
    --color-outline: #7e7576;
    --color-on-ink: #ffffff;

    /* Semantic */
    --color-error: #ba1a1a;

    /* Spacing (4px unit) */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    --sp-8: 32px;
    --sp-10: 40px;
    --sp-12: 48px;
    --sp-16: 64px;

    /* Layout */
    --container-max: 1200px;
    --gutter: 24px;
    --margin: 32px;

    /* Typography */
    --font-mono: 'JetBrains Mono', monospace;
    --font-body: 'Inter', sans-serif;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    border-radius: 0 !important;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-ink-soft);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--color-ink);
    color: var(--color-on-ink);
}

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

img {
    max-width: 100%;
    display: block;
}

ul, ol { list-style: none; }

/* ---- Custom Scrollbar ---- */
::-webkit-scrollbar {
    width: 10px;
    background: var(--color-bg);
    border-left: 1px solid var(--color-ink);
}
::-webkit-scrollbar-thumb {
    background: var(--color-ink);
}

/* ---- Dither Patterns ---- */
.dither-bg {
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000"/><rect x="2" y="2" width="1" height="1" fill="%23000"/></svg>');
    background-repeat: repeat;
}

.dither-bg-25 {
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000" opacity="0.25"/><rect x="2" y="2" width="1" height="1" fill="%23000" opacity="0.25"/></svg>');
    background-repeat: repeat;
}

.dither-bg-10 {
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000" opacity="0.10"/><rect x="2" y="2" width="1" height="1" fill="%23000" opacity="0.10"/></svg>');
    background-repeat: repeat;
}

/* ---- Layout ---- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--margin);
    width: 100%;
}

.section {
    padding: var(--sp-16) 0;
    border-bottom: 1px solid var(--color-ink);
}

.section:last-of-type {
    border-bottom: none;
}

/* ---- Grid ---- */
.grid {
    display: grid;
    gap: 0;
}

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

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

/* ---- Typography ---- */
h1, h2, h3, h4 {
    font-family: var(--font-mono);
    color: var(--color-ink);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 32px;
    line-height: 1.2;
}

h2 {
    font-size: 20px;
    line-height: 1.4;
    font-weight: 600;
    padding-bottom: var(--sp-4);
    border-bottom: 1px solid var(--color-ink);
    margin-bottom: var(--sp-6);
}

h3 {
    font-size: 18px;
    line-height: 1.3;
    font-weight: 600;
}

.mono {
    font-family: var(--font-mono);
}

.mono-sm {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.4;
}

.mono-label {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.mono-xs {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* ---- Navbar ---- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-ink);
    padding: var(--sp-1) var(--margin);
}

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

.nav-logo a {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    color: var(--color-ink);
    text-transform: uppercase;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
    padding: var(--sp-2) var(--sp-3);
    transition: background-color 0.05s, color 0.05s;
    border-left: 1px solid transparent;
}

.nav-links a:hover {
    background: var(--color-surface);
    color: var(--color-ink);
}

.nav-links a.active {
    color: var(--color-ink);
    border-bottom: 2px solid var(--color-ink);
    font-weight: 600;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--color-ink);
    font-family: var(--font-mono);
    font-size: 18px;
    cursor: pointer;
    padding: var(--sp-1) var(--sp-2);
    color: var(--color-ink);
}

.mobile-menu-btn:active {
    background: var(--color-ink);
    color: var(--color-on-ink);
}

/* ---- Hero ---- */
.hero {
    padding: var(--sp-16) 0 var(--sp-12);
    border-bottom: 1px solid var(--color-ink);
}

.hero h1 {
    font-size: 40px;
    margin-bottom: var(--sp-2);
}

.hero-subheading {
    font-family: var(--font-mono);
    font-size: 14px;
    text-transform: uppercase;
    color: var(--color-secondary);
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: var(--sp-6);
}

.hero-coverage {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: var(--sp-6);
    padding: var(--sp-3) var(--sp-4);
    border: 1px solid var(--color-ink);
    background: var(--color-canvas);
    display: inline-block;
}

.hero-statement {
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-ink-soft);
    max-width: 680px;
    margin-bottom: var(--sp-8);
    padding-left: var(--sp-4);
    border-left: 3px solid var(--color-ink);
}

.hero-actions {
    display: flex;
    gap: var(--sp-4);
    margin-bottom: var(--sp-8);
}

/* ---- Buttons ---- */
.btn {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: var(--sp-3) var(--sp-6);
    border: 1px solid var(--color-ink);
    cursor: pointer;
    transition: all 0.05s;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    opacity: 0.85;
}

.btn-primary:active {
    background: var(--color-canvas);
    color: var(--color-ink);
}

.btn-secondary {
    background: var(--color-canvas);
    color: var(--color-ink);
}

.btn-secondary:hover {
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000" opacity="0.25"/><rect x="2" y="2" width="1" height="1" fill="%23000" opacity="0.25"/></svg>');
    background-repeat: repeat;
}

.btn-secondary:active {
    background-image: none;
    background-color: var(--color-ink);
    color: var(--color-on-ink);
}

/* ---- Social Links ---- */
.social-links {
    display: flex;
    gap: 0;
}

.social-links a {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
    padding: var(--sp-2) var(--sp-3);
    border: 1px solid var(--color-ink);
    border-right: none;
    transition: all 0.05s;
}

.social-links a:last-child {
    border-right: 1px solid var(--color-ink);
}

.social-links a:hover {
    background: var(--color-ink);
    color: var(--color-on-ink);
}

/* ---- Cards ---- */
.card {
    border: 1px solid var(--color-ink);
    background: var(--color-canvas);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: transform 0.1s;
}

.card:hover {
    transform: translate(2px, -2px);
}

/* Dithered shadow behind card */
.card::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    right: -4px;
    bottom: -4px;
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000"/><rect x="2" y="2" width="1" height="1" fill="%23000"/></svg>');
    background-repeat: repeat;
    z-index: -1;
    border: 1px solid var(--color-ink);
    transition: transform 0.1s;
}

.card:hover::before {
    transform: translate(2px, 2px);
}

.card-header {
    background: var(--color-ink);
    color: var(--color-on-ink);
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: var(--sp-2) var(--sp-3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-ink);
}

.card-body {
    padding: var(--sp-4);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.card-category {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
}

.card-title {
    font-family: var(--font-mono);
    font-size: 17px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-ink);
    text-transform: none;
    letter-spacing: -0.01em;
}

.card-desc {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-secondary);
}

.card-meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-secondary);
    text-transform: uppercase;
    border-left: 2px solid var(--color-ink);
    padding-left: var(--sp-2);
}

.card-link {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-ink);
    padding: var(--sp-2) 0;
    border: 1px solid var(--color-ink);
    text-align: center;
    margin-top: auto;
    display: block;
    transition: all 0.05s;
}

.card-link:hover {
    background: var(--color-ink);
    color: var(--color-on-ink);
}

.card-link:active {
    background: var(--color-canvas);
    color: var(--color-ink);
}

/* Bullet lists inside cards */
.card-bullets {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-secondary);
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

.card-bullets li {
    padding-left: var(--sp-4);
    position: relative;
}

.card-bullets li::before {
    content: '>';
    font-family: var(--font-mono);
    font-size: 12px;
    position: absolute;
    left: 0;
    color: var(--color-ink);
    font-weight: 700;
}

/* ---- Section Title Bar (for page headers) ---- */
.section-title-bar {
    background: var(--color-ink);
    color: var(--color-on-ink);
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: var(--sp-2) var(--sp-4);
    margin-bottom: var(--sp-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-title-bar .blink {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ---- Filter Bar ---- */
.filter-bar {
    display: flex;
    gap: 0;
    margin-bottom: var(--sp-6);
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: var(--sp-2) var(--sp-4);
    border: 1px solid var(--color-ink);
    border-right: none;
    background: var(--color-canvas);
    color: var(--color-ink);
    cursor: pointer;
    transition: all 0.05s;
}

.filter-btn:last-child {
    border-right: 1px solid var(--color-ink);
}

.filter-btn:hover {
    background-image: url('data:image/svg+xml;utf8,<svg width="4" height="4" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%23000" opacity="0.25"/><rect x="2" y="2" width="1" height="1" fill="%23000" opacity="0.25"/></svg>');
    background-repeat: repeat;
}

.filter-btn.active {
    background-image: none;
    background-color: var(--color-ink);
    color: var(--color-on-ink);
}

/* ---- Forms ---- */
.form-group {
    margin-bottom: var(--sp-6);
    position: relative;
}

.form-label {
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
    display: block;
    margin-bottom: var(--sp-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    font-family: var(--font-body);
    font-size: 15px;
    padding: var(--sp-3) var(--sp-4);
    border: 1px solid var(--color-ink);
    background: var(--color-canvas);
    color: var(--color-ink-soft);
    outline: none;
    transition: box-shadow 0.1s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    box-shadow: 3px 3px 0 0 var(--color-ink);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    font-family: var(--font-body);
}

.form-select {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg width="12" height="8" xmlns="http://www.w3.org/2000/svg"><path d="M0 0 L6 8 L12 0" fill="%23000"/></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ---- Footer ---- */
.footer {
    border-top: 1px solid var(--color-ink);
    padding: var(--sp-6) 0;
    background: var(--color-bg);
    margin-top: auto;
}

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

.footer-text {
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    color: var(--color-secondary);
    letter-spacing: 0.03em;
}

/* ---- Engagements List ---- */
.engage-list {
    list-style: none;
    padding: 0;
    border: 1px solid var(--color-ink);
    background: var(--color-canvas);
}

.engage-list li {
    font-family: var(--font-mono);
    font-size: 14px;
    text-transform: uppercase;
    padding: var(--sp-3) var(--sp-4);
    border-bottom: 1px solid var(--color-ink);
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    transition: background 0.05s;
}

.engage-list li:last-child {
    border-bottom: none;
}

.engage-list li:hover {
    background: var(--color-surface);
}

.engage-list li::before {
    content: '>';
    font-weight: 700;
    color: var(--color-ink);
}

/* ---- Contact Info Blocks ---- */
.contact-info-label {
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
    margin-bottom: var(--sp-3);
}

.contact-link {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--color-ink);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.contact-link:hover {
    background: var(--color-ink);
    color: var(--color-on-ink);
    text-decoration: none;
    padding: 2px 4px;
    margin: -2px -4px;
}

/* ---- Dashboard Title (big) ---- */
.dash-title {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-ink);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    margin-bottom: var(--sp-4);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .grid-3 {
        grid-template-columns: 1fr;
    }
    .grid-2 {
        grid-template-columns: 1fr;
    }
    h1 {
        font-size: 24px;
    }
    .hero h1 {
        font-size: 28px;
    }
    .container {
        padding: 0 var(--sp-4);
    }
    .section {
        padding: var(--sp-10) 0;
    }
    .footer-content {
        flex-direction: column;
        gap: var(--sp-4);
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-ink);
        z-index: 99;
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links a {
        padding: var(--sp-3) var(--sp-4);
        border-bottom: 1px solid var(--color-surface-high);
        border-left: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
    .social-links {
        flex-wrap: wrap;
    }
}

/* ---- Utility: hidden ---- */
.hidden {
    display: none !important;
}