/* ============================================================
   Shared design system — Ibrahim Bin Mansur portfolio
   Dark & techy: near-black navy, glowing cyan, mono accents
   ============================================================ */

:root {
    --bg: #0a0f1e;
    --surface: #111827;
    --surface-2: #16203a;
    --border: rgba(148, 163, 184, 0.14);
    --accent: #22d3ee;
    --accent-soft: rgba(34, 211, 238, 0.12);
    --accent-2: #818cf8;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;
    --radius: 12px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --glow: 0 0 24px rgba(34, 211, 238, 0.25);
    --nav-height: 64px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--bg);
}

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

a {
    color: var(--accent);
    text-decoration: none;
}

/* ---------- layout helpers ---------- */

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

.section {
    padding: 88px 0;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent);
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.section-title::after {
    content: "";
    flex: 1;
    max-width: 240px;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0.5;
}

/* ---------- navigation ---------- */

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(10, 15, 30, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.site-nav .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
}

.nav-logo .bracket {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-links a {
    color: var(--muted);
    font-size: 0.95rem;
    padding: 8px 14px;
    position: relative;
    transition: color 0.25s ease;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 2px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #fff;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    transform: scaleX(1);
}

.nav-links .nav-cta {
    color: var(--accent);
    border: 1px solid rgba(34, 211, 238, 0.4);
    border-radius: 8px;
    margin-left: 8px;
    transition: background 0.25s ease, box-shadow 0.25s ease;
}

.nav-links .nav-cta::after {
    display: none;
}

.nav-links .nav-cta:hover {
    background: var(--accent-soft);
    box-shadow: var(--glow);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    margin: 5px 0;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---------- buttons ---------- */

.btn {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 12px 26px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.btn-primary {
    background: var(--accent);
    color: #06121a;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

.btn-outline {
    color: var(--accent);
    border-color: rgba(34, 211, 238, 0.4);
}

.btn-outline:hover {
    background: var(--accent-soft);
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

/* ---------- cards ---------- */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(34, 211, 238, 0.45);
    box-shadow: var(--shadow), var(--glow);
}

/* ---------- tech chips ---------- */

.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.chips li {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(34, 211, 238, 0.25);
    padding: 4px 10px;
    border-radius: 999px;
    white-space: nowrap;
}

/* ---------- social icons ---------- */

.social-icons {
    display: flex;
    gap: 14px;
    align-items: center;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 1.15rem;
    transition: color 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.social-icons a:hover {
    color: var(--accent);
    border-color: rgba(34, 211, 238, 0.5);
    transform: translateY(-3px);
    box-shadow: var(--glow);
}

/* ---------- footer ---------- */

.site-footer {
    border-top: 1px solid var(--border);
    padding: 36px 0;
    margin-top: 40px;
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    text-align: center;
}

.site-footer p {
    color: var(--muted);
    font-size: 0.9rem;
}

.site-footer .footer-mono {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted);
    opacity: 0.7;
}

/* ---------- scroll reveal (only when JS is available) ---------- */

html.js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js .reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    html.js .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ---------- responsive nav ---------- */

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: rgba(10, 15, 30, 0.97);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        padding: 12px 6%;
        transform: translateY(calc(-100% - var(--nav-height) - 20px));
        transition: transform 0.3s ease;
    }

    .nav-links.open {
        transform: translateY(0);
    }

    .nav-links a {
        padding: 14px 8px;
        font-size: 1.05rem;
    }

    .nav-links .nav-cta {
        margin: 10px 0 4px;
        text-align: center;
    }

    .section {
        padding: 64px 0;
    }
}