/* ===== Design Tokens ===== */
:root {
    --bg: #0a0a0a;
    --surface: #121315;
    --surface-2: #17191c;
    --border: #23262b;
    --border-strong: #2f343b;
    --primary: #1baed3;
    --secondary: #2ec4b6;
    --accent-soft: rgba(46, 196, 182, 0.12);

    --text: #f2f4f5;
    --muted: #9aa3ab;
    --error: #ff6467;

    --radius: 16px;
    --radius-sm: 10px;
    --maxw: 1180px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);

    --shadow: 0 18px 40px -18px rgba(0, 0, 0, 0.7);
    --glow: 0 0 0 1px rgba(46, 196, 182, 0.4), 0 0 32px -6px rgba(46, 196, 182, 0.45);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }
html, body { overflow-x: hidden; }

body {
    font-family: "Inter", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .brand-text { font-family: "Space Grotesk", "Inter", sans-serif; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* Background ambience */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(620px circle at 12% -5%, rgba(27, 174, 211, 0.10), transparent 55%),
        radial-gradient(680px circle at 95% 8%, rgba(46, 196, 182, 0.10), transparent 55%);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 12px; }
::-webkit-scrollbar-track { background: #131517; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 20px; border: 3px solid #131517; }
::-webkit-scrollbar-thumb:hover { background: var(--secondary); }

/* ===== Scroll Progress ===== */
#scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    z-index: 1000;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 24px; right: 24px;
    width: 48px; height: 48px;
    display: grid; place-items: center;
    border: none;
    border-radius: 50%;
    background: var(--secondary);
    color: #04201d;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 8px 24px -6px rgba(46, 196, 182, 0.7);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all 0.5s;
    z-index: 900;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px) scale(1.06);transition: all 0.3s }

/* ===== Layout helpers ===== */
main { width: 100%; }
.section {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 88px 24px;
}

/* ===== Navigation ===== */
header {
    position: sticky;
    top: 0;
    z-index: 800;
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s, background 0.3s;
}
header.scrolled { border-bottom-color: var(--border); background: rgba(10, 10, 10, 0.88); }

.nav {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; }
.brand-badge {
    display: grid; place-items: center;
    width: 38px; height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #04201d;
    font-family: "Space Grotesk", sans-serif;
    font-weight: 700;
    font-size: 20px;
}
.brand-text { color: var(--text); }

.links { display: flex; align-items: center; gap: 8px; }
.links a {
    position: relative;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--muted);
    transition: color 0.25s, background 0.25s;
}
.links a:hover { color: var(--text); }
.links a.active { color: var(--secondary); background: var(--accent-soft); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform 0.25s var(--ease), box-shadow 0.3s, background 0.3s, border-color 0.3s, color 0.3s;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #04201d;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 30px -10px rgba(46, 196, 182, 0.65); }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--secondary); color: var(--secondary); transform: translateY(-3px); }
.btn-block { width: 100%; }

/* ===== Hero ===== */
.hero {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 72px 24px 96px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 56px;
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: 13px;
    font-weight: 500;
}
.eyebrow .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--secondary);
    box-shadow: 0 0 10px var(--secondary);
    animation: pulse 1.8s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero-title {
    font-size: clamp(2.6rem, 6vw, 4.2rem);
    line-height: 1.05;
    margin: 20px 0 8px;
    background: linear-gradient(120deg, #ffffff 30%, var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-role { font-size: clamp(1.1rem, 2.5vw, 1.4rem); color: var(--primary); font-weight: 600; }
.hero-desc { color: var(--muted); font-size: 1.05rem; max-width: 520px; margin-top: 16px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero-socials { display: flex; gap: 14px; margin-top: 32px; }
.hero-socials a {
    width: 44px; height: 44px;
    display: grid; place-items: center;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: 18px;
    transition: all 1s;
}
.hero-socials a:hover { color: var(--secondary); border-color: var(--secondary); transform: translateY(-4px); }

.hero-visual { position: relative; display: grid; place-items: center; }
.hero-visual img {
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    animation: float 6s ease-in-out infinite;
}
.hero-glow {
    position: absolute;
    inset: 10%;
    background: radial-gradient(circle, rgba(46, 196, 182, 0.35), transparent 65%);
    filter: blur(40px);
    z-index: -1;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* ===== Section heads ===== */
.section-head { text-align: center; max-width: 680px; margin: 0 auto 56px; }
.section-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--secondary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.section-title { font-size: clamp(2rem, 4.5vw, 2.9rem); margin: 16px 0 14px; }
.section-title span {
    background: linear-gradient(120deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.section-desc { color: var(--muted); font-size: 1.02rem; }

/* ===== Stats ===== */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 56px;
}
.stat {
    text-align: center;
    padding: 30px 18px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
}
.stat-num, .stat-plus {
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--secondary);
}
.stat p { color: var(--muted); margin-top: 6px; font-size: 0.95rem; }

/* ===== Skills ===== */
.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.skill-card {
    position: relative;
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    overflow: hidden;
    transition: transform 0.35s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.skill-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    height: 3px; width: 0;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.4s var(--ease);
}
.skill-card:hover { transform: translateY(-8px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.skill-card:hover::before { width: 100%; }
.skill-icon {
    width: 52px; height: 52px;
    display: grid; place-items: center;
    border-radius: 14px;
    background: var(--accent-soft);
    color: var(--secondary);
    font-size: 22px;
    margin-bottom: 18px;
}
.skill-card h3 { font-size: 1.4rem; margin-bottom: 16px; }
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tags span {
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    color: var(--muted);
    font-size: 0.85rem;
    transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.tags span:hover { color: var(--secondary); border-color: var(--secondary); background: var(--accent-soft); }

/* ===== Projects ===== */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card {
    display: flex;
    flex-direction: column;
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    transition: transform 0.35s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.project-card:hover { transform: translateY(-8px); border-color: var(--secondary); box-shadow: var(--shadow); }
.project-top {
    position: relative;
    height: 120px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(27,174,211,0.12), rgba(46,196,182,0.12));
    border: 1px solid var(--border);
    overflow: hidden;
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
    padding: 14px;
}
.project-chip {
    padding: 5px 12px;
    border-radius: 999px;
    background: rgba(10,10,10,0.5);
    color: var(--secondary);
    font-size: 12px;
    font-weight: 600;
    z-index: 2;
}
.project-bg-icon {
    position: absolute;
    right: -6px; bottom: -14px;
    font-size: 86px;
    color: rgba(46, 196, 182, 0.18);
}
.project-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
.project-card > p { color: var(--muted); font-size: 0.95rem; flex: 1; }
.project-links { display: flex; gap: 10px; margin-top: 20px; }
.project-links a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 14px;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.25s, border-color 0.25s, transform 0.25s;
}
.project-links a:hover { color: var(--secondary); border-color: var(--secondary); transform: translateY(-2px); }

/* ===== Certificates ===== */
.certificates { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cert-card {
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    overflow: hidden;
    transition: transform 0.35s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.cert-card:hover { transform: translateY(-8px); border-color: var(--secondary); box-shadow: var(--shadow); }
.cert-thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.cert-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.cert-card:hover .cert-thumb img { transform: scale(1.07);}
.cert-date {
    position: absolute;
    top: 12px; right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    border-radius: 999px;
    background: rgba(10,10,10,0.65);
    backdrop-filter: blur(6px);
    color: var(--text);
    font-size: 12px;
    font-weight: 500;
}
.cert-body { padding: 22px; }
.cert-body h3 { font-size: 1.2rem; margin-bottom: 8px; }
.cert-org { color: var(--muted); font-size: 0.9rem; display: flex; align-items: center; gap: 8px; }
.cert-org i { color: var(--secondary); }
.cert-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 18px;
    padding: 10px 16px;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--secondary);
    font-size: 0.9rem;
    font-weight: 600;
    transition: gap 0.25s, background 0.25s;
}
.cert-btn:hover { gap: 12px; background: rgba(46,196,182,0.2); }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 24px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.info-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 22px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.info-card:hover { transform: translateX(6px); border-color: var(--secondary); box-shadow: var(--shadow); }
.info-icon {
    flex-shrink: 0;
    width: 50px; height: 50px;
    display: grid; place-items: center;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #04201d;
    font-size: 19px;
}
.info-card h3 { font-size: 1.05rem; }
.info-card p { color: var(--muted); font-size: 0.92rem; }

.form-card {
    padding: 32px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
}
.form-card h3 { font-size: 1.4rem; margin-bottom: 22px; text-align: center; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 0.92rem; font-weight: 600; margin-bottom: 7px; }
.field label span { color: var(--secondary); }
.field input, .field textarea {
    width: 100%;
    padding: 13px 15px;
    border-radius: 12px;
    border: 1px solid var(--border-strong);
    background: var(--surface-2);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.25s, box-shadow 0.25s;
    resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: #6b7178; }
.field input:focus, .field textarea:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(46, 196, 182, 0.18);
}
.field input.invalid, .field textarea.invalid { border-color: var(--error); }
.err { color: var(--error); font-size: 0.82rem; margin-top: 6px; min-height: 1em; }
.form-success {
    display: none;
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--secondary);
    font-size: 0.9rem;
    text-align: center;
}
.form-success.show { display: block; }

/* ===== Footer ===== */
footer { border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 56px 24px 36px;
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
}
.footer-brand p { color: var(--muted); margin-top: 14px; max-width: 280px; font-size: 0.95rem; }
.footer-col h2 { font-size: 1.05rem; margin-bottom: 16px; }
.footer-col a { display: block; color: var(--muted); padding: 5px 0; font-size: 0.95rem; transition: color 0.25s, transform 0.25s; }
.footer-col a:hover { color: var(--secondary); transform: translateX(4px); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
    width: 42px; height: 42px;
    display: grid; place-items: center;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: 17px;
    transition: color 0.25s, border-color 0.25s, transform 0.25s;
}
.footer-socials a:hover { color: var(--secondary); border-color: var(--secondary); transform: translateY(-4px); }
.footer-bottom { border-top: 1px solid var(--border); padding: 22px 24px; text-align: center; }
.footer-bottom p { color: var(--muted); font-size: 0.88rem; }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .hero { grid-template-columns: 1fr; text-align: center; padding-top: 48px; }
    .hero-desc { margin-left: auto; margin-right: auto; }
    .hero-actions, .hero-socials { justify-content: center; }
    .hero-visual { order: -1; max-width: 360px; margin: 0 auto; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
    .nav-toggle { display: flex; }
    .links {
        position: absolute;
        top: 100%; left: 0; right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding: 14px 24px 22px;
        background: rgba(10, 10, 10, 0.97);
        backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border);
        transform: translateY(-12px);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.3s var(--ease), opacity 0.3s;
    }
    .links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
    .links a { padding: 12px 14px; }
    .skills, .projects, .certificates, .stats { grid-template-columns: 1fr; }
    .stats { gap: 14px; }
    .footer-inner { grid-template-columns: 1fr; gap: 32px; }
    .section { padding: 64px 20px; }
}

@media (max-width: 420px) {
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal { opacity: 1; transform: none; }
}