/* Sciemo-Inspired Design System */
@import url('https://fonts.googleapis.com/css2?family=Cousine:wght@400;700&family=Noto+Sans:wght@400;700&display=swap');

:root {
    --color-background: #F7F7F7;
    --color-black: #1B1C1C;
    --color-accent: #E8846B;
    --color-gray-light: #E8E8E8;
    --color-gray-mid: #6B6B6B;
    --color-white: #FFFFFF;
    --color-success: #2E7D32;
    --color-error: #C62828;
    --font-heading: 'Noto Sans', sans-serif;
    --font-mono: 'Cousine', monospace;
    --font-body: 'Noto Sans', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background: var(--color-background);
    color: var(--color-black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* Header */
header {
    border: 1px solid var(--color-black);
    padding: 20px 24px;
    margin-bottom: 24px;
    background: var(--color-background);
}

h1 {
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-black);
    text-transform: lowercase;
    margin-bottom: 4px;
}

.subtitle {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-mid);
}

/* Navigation */
nav {
    border: 1px solid var(--color-black);
    padding: 0;
    margin-bottom: 24px;
    display: flex;
    background: var(--color-white);
    flex-wrap: wrap;
}

nav a {
    padding: 12px 16px;
    text-decoration: none;
    color: var(--color-gray-mid);
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.15s ease;
    border-right: 1px solid var(--color-black);
}

nav a:last-child {
    border-right: none;
}

nav a:hover {
    background: var(--color-gray-light);
    color: var(--color-black);
}

nav a.active {
    background: var(--color-black);
    color: var(--color-white);
}

/* Content Area */
.content {
    background: var(--color-white);
    border: 1px solid var(--color-black);
    padding: 32px;
    position: relative;
}

.content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-black);
}

/* Typography */
h2 {
    font-family: var(--font-heading);
    color: var(--color-black);
    font-size: 1rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin: 32px 0 16px 0;
    padding-top: 24px;
    border-top: 1px solid var(--color-gray-light);
}

h2:first-child {
    margin-top: 8px;
    padding-top: 8px;
    border-top: none;
}

h3 {
    font-family: var(--font-heading);
    color: var(--color-black);
    font-size: 0.9rem;
    font-weight: 400;
    margin: 24px 0 12px 0;
}

p {
    color: var(--color-black);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

/* Highlight Box */
.highlight-box {
    background: var(--color-gray-light);
    border-left: 3px solid var(--color-accent);
    padding: 20px;
    margin: 20px 0;
}

.highlight-box strong {
    color: var(--color-black);
}

/* Lists */
ul, ol {
    margin: 12px 0 12px 24px;
    color: var(--color-black);
}

li {
    margin: 8px 0;
    font-size: 0.9rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--color-gray-light);
    font-size: 0.85rem;
}

th {
    background: var(--color-gray-light);
    color: var(--color-black);
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    color: var(--color-black);
}

tr:hover td {
    background: var(--color-gray-light);
}

/* Cards */
.card, .strategy-card, .research-card, .component-card, .theme-section {
    background: var(--color-gray-light);
    border: 1px solid var(--color-black);
    padding: 20px;
    margin: 16px 0;
    position: relative;
}

.card::before, .strategy-card::before, .research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-black);
}

.card h3, .card h4, .strategy-card h4, .research-card h3, .component-card h3, .theme-section h3 {
    font-family: var(--font-heading);
    color: var(--color-black);
    margin-bottom: 12px;
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
}

.card p, .strategy-card p, .research-card p, .component-card p, .theme-section p {
    color: var(--color-gray-mid);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

/* Grid Layouts */
.research-grid, .component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

/* Links */
a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    text-decoration: underline;
}

/* Buttons */
.btn, .research-card a, .highlight-box a {
    display: inline-block;
    color: var(--color-black);
    background: var(--color-white);
    padding: 8px 16px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--color-black);
    text-decoration: none;
    transition: all 0.15s ease;
}

.btn:hover, .research-card a:hover, .highlight-box a:hover {
    background: var(--color-black);
    color: var(--color-white);
    text-decoration: none;
}

/* Stat Box */
.stat-box {
    background: var(--color-white);
    padding: 16px 20px;
    border: 1px solid var(--color-black);
    border-left: 3px solid var(--color-accent);
    margin: 12px 0;
}

.stat-box strong {
    font-family: var(--font-heading);
    color: var(--color-black);
    font-size: 1.25rem;
    font-weight: 400;
}

/* Key Paper Highlight */
.key-paper {
    border: 2px solid var(--color-accent);
}

/* Code */
code {
    background: var(--color-gray-light);
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-black);
    border: 1px solid var(--color-black);
}

pre {
    background: var(--color-black);
    color: var(--color-white);
    padding: 20px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    border: 1px solid var(--color-black);
    margin: 20px 0;
}

/* Tech Stack */
.tech-stack {
    background: var(--color-gray-light);
    padding: 20px;
    border: 1px solid var(--color-black);
    margin: 20px 0;
}

.tech-stack h3 {
    font-family: var(--font-mono);
    color: var(--color-black);
    margin-bottom: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.tech-badge {
    display: inline-block;
    background: var(--color-white);
    border: 1px solid var(--color-black);
    color: var(--color-black);
    padding: 6px 12px;
    margin: 4px;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.7rem;
    text-transform: uppercase;
}

/* Architecture Flow */
.architecture-flow {
    background: var(--color-gray-light);
    padding: 24px;
    border: 1px solid var(--color-black);
    margin: 20px 0;
}

.flow-box {
    background: var(--color-white);
    border: 1px solid var(--color-black);
    padding: 16px;
    margin: 12px 0;
    text-align: center;
}

.flow-box h3 {
    font-family: var(--font-heading);
    color: var(--color-black);
    margin-bottom: 6px;
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
}

.flow-box p {
    color: var(--color-gray-mid);
    font-size: 0.8rem;
    margin: 0;
}

.flow-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--color-accent);
    margin: 8px 0;
}

/* Formula Box (for math pages) */
.formula-box {
    background: var(--color-white);
    border: 1px solid var(--color-accent);
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.formula-box .label {
    font-family: var(--font-mono);
    color: var(--color-accent);
    font-weight: 700;
    font-size: 0.7rem;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Example Box */
.example-box {
    background: var(--color-gray-light);
    border: 1px solid var(--color-success);
    border-left: 3px solid var(--color-success);
    padding: 20px;
    margin: 20px 0;
}

.example-box h4 {
    font-family: var(--font-mono);
    color: var(--color-success);
    margin-bottom: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* Footer */
footer {
    background: var(--color-black);
    border: 1px solid var(--color-black);
    padding: 32px;
    text-align: center;
    color: var(--color-white);
    margin-top: 24px;
}

footer p {
    font-size: 0.85rem;
    margin: 8px 0;
    color: var(--color-gray-light);
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 1.1rem; }
    .content { padding: 20px; }
    .research-grid, .component-grid { grid-template-columns: 1fr; }

    nav {
        flex-wrap: wrap;
    }

    nav a {
        flex: 1;
        text-align: center;
        min-width: 80px;
        border-bottom: 1px solid var(--color-black);
    }
}