/* --- THEME CONFIGURATION --- */
:root {
    /* Default Dark Theme (matches original) */
    --bg-void: #0A0A0A;
    --bg-basalt: #141414;
    --text-titanium: #E5E5E5;
    --text-muted: #B3B3B3;
    --accent-orange: #FF4D00;
    --border-subtle: #333333;

    --font-main: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    --spacing-section: 120px;
    --spacing-mobile: 60px;
    --nav-height: 80px;
    --nav-bg: rgba(10, 10, 10, 0.95);
}

[data-theme="light"] {
    --bg-void: #FFFFFF;
    --bg-basalt: #F4F4F5;       /* Zinc-100 */
    --text-titanium: #18181B;   /* Zinc-900 */
    --text-muted: #52525B;      /* Zinc-600 */
    --accent-orange: #EA580C;   /* Slightly darker orange for better contrast on white */
    --border-subtle: #E4E4E7;   /* Zinc-200 */
    --nav-bg: rgba(255, 255, 255, 0.95);
}

/* --- RESET & BASE --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 20px);
}

body {
    background-color: var(--bg-void);
    color: var(--text-titanium);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.2s;
}

ul {
    list-style: none;
}

/* Custom Focus Ring for Accessibility */
:focus-visible {
    outline: 2px solid var(--accent-orange);
    outline-offset: 4px;
}

/* Skip to Main Content Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-orange);
    color: var(--bg-void);
    padding: 8px 16px;
    text-decoration: none;
    z-index: 2000;
    font-family: var(--font-code);
    font-size: 0.9rem;
}

.skip-link:focus {
    top: 10px;
    left: 10px;
}

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

.mono {
    font-family: var(--font-code);
    font-size: 0.85rem;
    letter-spacing: -0.02em;
}

.orange-text {
    color: var(--accent-orange);
}

.section-label {
    font-family: var(--font-code);
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 24px;
    display: block;
}

.section-intro {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
    margin-bottom: 40px;
}

/* --- NAVIGATION --- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    padding: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-weight: 700;
    letter-spacing: -0.04em;
    font-size: 1.1rem;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-family: var(--font-code);
    padding: 8px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-orange);
}

.btn-action {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--accent-orange);
    border: 1px solid var(--accent-orange);
    padding: 8px 16px;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.btn-action:hover {
    background: rgba(255, 77, 0, 0.15);
    box-shadow: 0 0 15px rgba(255, 77, 0, 0.2);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.theme-toggle:hover {
    color: var(--accent-orange);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* --- FOOTER --- */
footer {
    padding: var(--spacing-section) 0;
    border-top: 1px solid var(--border-subtle);
}

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

.footer-links a {
    display: block;
    margin-bottom: 8px;
    font-family: var(--font-code);
    font-size: 0.9rem;
}

.footer-links a.highlight {
    color: var(--accent-orange);
}

.copyright {
    font-family: var(--font-code);
    color: var(--text-muted); /* Changed from fixed #444 for light mode compatibility */
    font-size: 0.75rem;
    opacity: 0.8;
}

/* --- RESPONSIVE / MOBILE TRANSITIONS --- */
@media (max-width: 900px) {
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 40px;
    }

    nav {
        height: auto;
        padding: 16px 0;
    }

    .nav-inner {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .nav-links {
        display: flex;
        gap: 20px;
    }
}