@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --bg: #09090b;
    --card: rgba(24, 24, 27, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-hover: rgba(255, 255, 255, 0.12);
    --text: #fafafa;
    --text-muted: #a1a1aa;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --radius: 16px;
    --btn-bg: rgba(39, 39, 42, 0.6);
    --btn-hover: rgba(63, 63, 70, 0.8);
    --glass-bg: rgba(9, 9, 11, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] {
    --bg: #fafafa;
    --card: rgba(255, 255, 255, 0.7);
    --card-border: rgba(0, 0, 0, 0.08);
    --card-hover: rgba(0, 0, 0, 0.12);
    --text: #09090b;
    --text-muted: #52525b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-glow: rgba(37, 99, 235, 0.12);
    --btn-bg: rgba(228, 228, 231, 0.7);
    --btn-hover: rgba(212, 212, 216, 0.9);
    --glass-bg: rgba(250, 250, 250, 0.7);
    --glass-border: rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-image: radial-gradient(circle at 100% 0%, var(--accent-glow) 0%, transparent 40%),
                      radial-gradient(circle at 0% 100%, var(--accent-glow) 0%, transparent 40%);
    background-attachment: fixed;
}

/* Header */
header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-container {
    max-width: 100%;
    padding: 1rem 3rem;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.brand {
    justify-self: start;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--text), var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: opacity 0.2s ease;
}

.brand:hover {
    opacity: 0.8;
}

.nav-links {
    justify-self: center;
    display: flex;
    align-items: center;
    gap: 1.75rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text);
    transform: translateY(-1px);
}

.theme-toggle {
    justify-self: end;
    background: var(--btn-bg);
    border: 1px solid var(--card-border);
    color: var(--text);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(8px);
}

.theme-toggle:hover {
    background: var(--btn-hover);
    border-color: var(--text-muted);
    transform: rotate(15deg) scale(1.05);
}

/* Main */
main {
    flex: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
    width: 100%;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    margin-bottom: 3.5rem;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text), var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-header p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Grid & Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.card.clickable:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--accent-glow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex: 1;
}

.card-action {
    margin-top: 1.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.2s ease;
}

.card.clickable:hover .card-action {
    gap: 0.75rem;
}

/* Content Layout (Legal, Docs) */
.content-body {
    max-width: 800px;
    margin: 0 auto;
}

.content-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text);
}

.content-body p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.content-body ul {
    color: var(--text-muted);
    font-size: 1rem;
    margin-left: 1.5rem;
    margin-bottom: 1.25rem;
}

.content-body li {
    margin-bottom: 0.5rem;
}

.content-body strong {
    color: var(--text);
}

.content-body a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

.content-body a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Footer */
footer {
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
    padding: 2rem 1.5rem;
    font-size: 0.95rem;
    color: var(--text-muted);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    margin-top: auto;
}

.footer-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-links {
    display: flex;
    gap: 1.75rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Responsive */
@media (max-width: 640px) {
    .header-container {
        padding: 1rem;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    .brand {
        order: 1;
    }
    .theme-toggle {
        order: 2;
    }
    .nav-links {
        order: 3;
        width: 100%;
        margin-top: 1.25rem;
        justify-content: center;
        gap: 1.25rem;
        flex-wrap: wrap;
    }
    .page-header h1 {
        font-size: 2.25rem;
    }
    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 1.25rem;
    }
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    main {
        padding: 2.5rem 1rem;
    }
}