:root {
    --bg-primary: #0E1420;
    --bg-secondary: #161D2E;
    --bg-card: rgba(22, 29, 46, 0.75);
    --bg-card-hover: rgba(30, 38, 58, 0.9);
    --text-primary: #ececf5;
    --text-secondary: #a8a8c0;
    --text-muted: #6a6a84;
    --accent-gold: #C9A227;
    --accent-teal: #4C8577;
    --accent-dim: rgba(201, 162, 39, 0.10);
    --border-subtle: rgba(255, 255, 255, 0.04);
    --radius: 16px;
    --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --nav-height: 64px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    padding-top: var(--nav-height);
}
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    background: radial-gradient(circle at 15% 10%, rgba(201, 162, 39, 0.06) 0%, transparent 45%);
    pointer-events: none;
}
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-gold); border-radius: 12px; }

.navbar {
    position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height);
    background: rgba(14, 20, 32, 0.85);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-subtle);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 40px; z-index: 100;
}
.nav-availability {
    display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); background: rgba(201, 162, 39, 0.08);
    padding: 4px 16px; border-radius: 30px; border: 1px solid rgba(201, 162, 39, 0.12);
}
.nav-availability .dot { width: 6px; height: 6px; border-radius: 50%; background: #3ddc84; display: inline-block; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
    padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); transition: var(--transition); text-decoration: none; cursor: pointer;
}
.nav-links a:hover, .nav-links a.active { background: var(--accent-dim); color: var(--text-primary); }
.nav-links a.active { color: var(--accent-gold); }
.nav-links .cta-link {
    background: rgba(201, 162, 39, 0.12); border: 1px solid rgba(201, 162, 39, 0.25);
    color: var(--accent-gold); padding: 8px 20px; border-radius: 30px; font-weight: 600;
}
.nav-links .cta-link:hover { background: var(--accent-gold); color: #0b0b0e; border-color: var(--accent-gold); }
.hamburger {
    display: none; flex-direction: column; gap: 4px; background: none; border: none;
    cursor: pointer; padding: 4px; color: var(--text-primary);
}
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: var(--transition); }
.hamburger:hover span { background: var(--text-primary); }
.nav-overlay {
    display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: rgba(14, 20, 32, 0.95); backdrop-filter: blur(8px);
    padding: 20px 24px; flex-direction: column; gap: 8px; z-index: 99;
    border-bottom: 1px solid var(--border-subtle);
}
.nav-overlay.open { display: flex; }
.nav-overlay a {
    padding: 12px 16px; border-radius: 8px; font-size: 16px; font-weight: 500;
    color: var(--text-secondary); text-decoration: none; transition: var(--transition); cursor: pointer;
}
.nav-overlay a:hover, .nav-overlay a.active { background: var(--accent-dim); color: var(--text-primary); }
.nav-overlay a.active { color: var(--accent-gold); }
.nav-overlay .cta-link {
    color: var(--accent-gold); border: 1px solid rgba(201, 162, 39, 0.2);
    border-radius: 30px; text-align: center; margin-top: 4px;
}
.nav-overlay .cta-link:hover { background: var(--accent-gold); color: #0b0b0e; }

.main { position: relative; z-index: 1; max-width: 960px; margin: 0 auto; padding: 40px 32px 80px; }
section { margin-bottom: 80px; scroll-margin-top: calc(var(--nav-height) + 24px); }
.section-label {
    font-size: 12px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase;
    color: var(--accent-teal); margin-bottom: 10px;
}
.section-title { font-size: 32px; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 24px; line-height: 1.2; }
.section-subtext { font-size: 15px; color: var(--text-muted); margin-top: -14px; margin-bottom: 24px; max-width: 560px; }
.section-title span { color: var(--accent-gold); }

.hero { padding-top: 12px; text-align: center; }
.hero h1 { font-size: 52px; font-weight: 800; letter-spacing: -1.5px; line-height: 1.05; margin-bottom: 6px; }
.hero h1 .highlight { color: var(--accent-gold); }
.hero-sub { font-size: 20px; font-weight: 400; color: var(--text-secondary); margin-bottom: 8px; }
.hero-sub strong { color: var(--text-primary); font-weight: 600; }
.hero-tagline { font-size: 18px; color: var(--text-secondary); max-width: 680px; margin: 0 auto 18px; line-height: 1.5; }
.typewriter-container { font-size: 20px; color: var(--accent-teal); font-weight: 700; min-height: 2.4em; margin-bottom: 28px; }
.typewriter-container .cursor { display: inline-block; width: 3px; background: var(--accent-teal); margin-left: 4px; animation: blink 0.8s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .typewriter-container .cursor { animation: none; } }
.hero-cta { margin-top: 8px; margin-bottom: 28px; }
.hero-meta {
    margin-top: 32px; display: flex; flex-wrap: wrap; justify-content: center;
    gap: 24px 40px; padding-top: 24px; border-top: 1px solid var(--border-subtle);
}
.hero-meta-item { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--text-secondary); }
.hero-meta-item i { color: var(--accent-gold); font-size: 18px; width: 24px; }
.hero-meta-item strong { color: var(--text-primary); font-weight: 600; }

.about-grid { max-width: 760px; margin: 0 auto; }
.about-text p { color: var(--text-secondary); font-size: 16px; margin-bottom: 18px; }
.about-text p strong { color: var(--text-primary); }
.trust-strip { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-subtle); }
.trust-strip span {
    font-size: 12px; font-weight: 500; color: var(--text-secondary); background: rgba(10, 10, 18, 0.5);
    padding: 4px 14px; border-radius: 30px; border: 1px solid var(--border-subtle);
}

.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-top: 10px; }
.skill-card {
    background: var(--bg-card); backdrop-filter: blur(8px); border: 1px solid var(--border-subtle);
    border-radius: var(--radius); padding: 20px 22px; transition: var(--transition);
}
.skill-card:hover { background: var(--bg-card-hover); border-color: var(--accent-gold); transform: translateY(-3px); }
.skill-card .icon { font-size: 24px; color: var(--accent-gold); margin-bottom: 8px; }
.skill-card h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.skill-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.tech-tags-grouped {
    margin-top: 28px; display: flex; flex-direction: column; gap: 18px;
    padding: 20px 24px; background: var(--bg-card); backdrop-filter: blur(8px);
    border: 1px solid var(--border-subtle); border-radius: var(--radius);
}
.tag-group-label {
    font-size: 11px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase;
    color: var(--text-muted); margin-bottom: 8px;
}
.tag-group-list { display: flex; flex-wrap: wrap; gap: 10px 14px; }
.tag-group-list span {
    font-size: 13px; font-weight: 500; color: var(--text-secondary); background: rgba(10, 10, 18, 0.5);
    padding: 6px 16px; border-radius: 30px; border: 1px solid var(--border-subtle); transition: var(--transition);
}
.tag-group-list span:hover { border-color: var(--accent-gold); color: var(--text-primary); background: var(--accent-dim); }
.tag-group-list .tag-highlight { color: var(--accent-gold); border-color: rgba(201, 162, 39, 0.3); }

.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; margin-top: 10px; align-items: stretch; }
.project-card {
    background: var(--bg-card); backdrop-filter: blur(8px); border: 1px solid var(--border-subtle);
    border-radius: var(--radius); padding: 22px 22px; transition: var(--transition);
    position: relative; overflow: hidden; display: flex; flex-direction: column; height: 100%;
}
.project-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 0;
    background: var(--accent-gold); transition: height 0.4s ease;
}
.project-card:hover::before { height: 100%; }
.project-card:hover { background: var(--bg-card-hover); border-color: var(--accent-gold); transform: translateY(-6px); }
.project-card .project-icon { font-size: 22px; color: var(--accent-gold); margin-bottom: 8px; }
.project-card h4 { font-size: 18px; font-weight: 600; margin-bottom: 10px; line-height: 1.3; }

/* Compact one-line flow strip replaces the old tall SVG diagram */
.mini-flow-text {
    display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px;
    margin: 0 0 10px 0; font-size: 10.5px; font-weight: 600; letter-spacing: 0.4px;
    text-transform: uppercase; color: var(--text-muted);
}
.mini-flow-text span:first-child, .mini-flow-text span:last-child { color: var(--accent-gold); }
.mini-flow-text i { font-size: 7px; color: var(--border-subtle); }

.project-card .card-desc {
    font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 6px;
}
.ideal-for { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border-subtle); display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.ideal-for .label { font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; color: var(--text-muted); }
.ideal-for .pill {
    display: inline-block; font-size: 11.5px; font-weight: 500; color: var(--text-secondary);
    background: rgba(10, 10, 18, 0.5); padding: 2px 10px; border-radius: 30px;
    border: 1px solid var(--border-subtle);
}
.project-actions {
    display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: auto; padding-top: 14px;
    border-top: 1px solid var(--border-subtle); align-items: center;
}
.project-actions .case-link {
    display: inline-flex; align-items: center; gap: 8px; background: var(--accent-gold);
    color: #0b0b0e; padding: 10px 24px; border-radius: 30px; font-weight: 600; font-size: 14px;
    transition: var(--transition); border: none; cursor: pointer; text-decoration: none;
}
.project-actions .case-link:hover { background: #b89220; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(201, 162, 39, 0.2); }
.project-actions .repo-link {
    display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); transition: var(--transition); text-decoration: none;
}
.project-actions .repo-link:hover { color: var(--text-primary); }
.projects-closing { text-align: center; margin-top: 40px; }
.projects-closing p { color: var(--text-secondary); font-size: 15px; }

.cert-main {
    background: var(--bg-card); backdrop-filter: blur(8px); border: 1px solid var(--border-subtle);
    border-radius: var(--radius); padding: 28px 30px; transition: var(--transition);
    max-width: 720px; margin: 0 auto;
}
.cert-main:hover { border-color: var(--accent-gold); background: var(--bg-card-hover); }
.cert-main .header { display: flex; align-items: center; gap: 14px; margin-bottom: 4px; }
.cert-main .header i { font-size: 32px; color: var(--accent-gold); }
.cert-main .header h4 { font-size: 22px; font-weight: 700; }
.cert-main .issuer { font-size: 15px; color: var(--accent-teal); font-weight: 500; }
.cert-main .date { font-size: 14px; color: var(--text-muted); margin-bottom: 8px; }
.cert-main p { color: var(--text-secondary); font-size: 15px; line-height: 1.6; }
.cert-main .topics { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 12px; }
.cert-main .topics span {
    font-size: 13px; background: var(--bg-primary); padding: 4px 14px; border-radius: 30px;
    border: 1px solid var(--border-subtle); color: var(--text-secondary);
}

.case-study-page { max-width: 900px; margin: 0 auto; }
.case-back {
    display: inline-flex; align-items: center; gap: 8px; color: var(--text-secondary);
    font-size: 15px; font-weight: 500; cursor: pointer; transition: var(--transition);
    margin-bottom: 32px; padding: 8px 16px; border-radius: 8px; background: var(--bg-card);
    border: 1px solid var(--border-subtle); text-decoration: none;
}
.case-back:hover { color: var(--text-primary); border-color: var(--accent-gold); background: var(--bg-card-hover); }
.case-title { font-size: 38px; font-weight: 800; letter-spacing: -1px; line-height: 1.1; margin-bottom: 6px; }
.case-title span { color: var(--accent-gold); }
.case-subtitle {
    font-size: 16px; color: var(--text-secondary); margin-bottom: 32px;
    padding-bottom: 24px; border-bottom: 1px solid var(--border-subtle);
}
.case-block { margin-bottom: 40px; }
.case-block h3 { font-size: 22px; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.case-block h3 .accent { color: var(--accent-gold); }
.case-block p { color: var(--text-secondary); font-size: 16px; line-height: 1.7; max-width: 720px; }
.case-block .matters {
    background: var(--accent-dim); border-left: 3px solid var(--accent-gold); padding: 14px 20px;
    border-radius: 8px; margin-top: 8px; max-width: 720px;
}
.case-block .matters p { color: var(--text-secondary); font-size: 15px; }
.case-block .matters strong { color: var(--text-primary); }
.case-flow {
    margin: 16px 0 8px 0; width: 100%; max-width: 100%; height: 50px; display: block;
    background: var(--bg-card); border-radius: var(--radius); padding: 4px 0; border: 1px solid var(--border-subtle);
}
.case-tools { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: 8px; }
.case-tools span {
    font-size: 13px; font-weight: 500; color: var(--text-secondary); background: rgba(10, 10, 18, 0.5);
    padding: 6px 18px; border-radius: 30px; border: 1px solid var(--border-subtle);
}
.case-tools .highlight-tool { color: var(--accent-gold); border-color: rgba(201, 162, 39, 0.3); }
.case-steps { list-style: none; padding: 0; max-width: 720px; }
.case-steps li { display: flex; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border-subtle); align-items: flex-start; }
.case-steps li .num {
    font-size: 14px; font-weight: 700; color: var(--accent-gold); min-width: 28px;
    background: var(--accent-dim); border-radius: 50%; width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
    border: 1px solid rgba(201, 162, 39, 0.15);
}
.case-steps li .step-text { color: var(--text-secondary); font-size: 15px; line-height: 1.6; }
.case-steps li .step-text strong { color: var(--text-primary); }
.case-error-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 720px; margin-top: 8px; }
.case-error-item {
    background: var(--bg-card); border: 1px solid var(--border-subtle); border-radius: var(--radius);
    padding: 16px 20px; display: flex; align-items: flex-start; gap: 12px;
}
.case-error-item i { color: var(--accent-teal); font-size: 18px; margin-top: 2px; }
.case-error-item .text { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }
.case-error-item .text strong { color: var(--text-primary); }
.case-impact {
    background: var(--accent-dim); border: 1px solid rgba(201, 162, 39, 0.12); border-radius: var(--radius);
    padding: 20px 24px; max-width: 720px;
}
.case-impact p { color: var(--text-secondary); font-size: 16px; line-height: 1.7; margin-bottom: 0; }
.case-impact strong { color: var(--text-primary); }
.case-github-footer { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border-subtle); }
.case-github-footer a {
    display: inline-flex; align-items: center; gap: 10px; color: var(--text-secondary);
    font-size: 15px; font-weight: 500; transition: var(--transition); text-decoration: none;
    padding: 8px 20px; border-radius: 30px; border: 1px solid var(--border-subtle); background: var(--bg-card);
}
.case-github-footer a:hover { color: var(--text-primary); border-color: var(--accent-gold); background: var(--bg-card-hover); }

.contact-section { max-width: 900px; margin: 0 auto; text-align: left; }
.contact-sub { color: var(--text-secondary); font-size: 17px; max-width: 520px; line-height: 1.6; margin-bottom: 28px; }
.contact-primary-btn {
    display: inline-flex; align-items: center; gap: 12px; background: var(--accent-gold);
    color: #0b0b0e; padding: 16px 44px; border-radius: 40px; font-weight: 700; font-size: 18px;
    transition: var(--transition); border: none; cursor: pointer; text-decoration: none; margin-bottom: 32px;
}
.contact-primary-btn:hover { background: #b89220; transform: translateY(-3px); box-shadow: 0 12px 30px rgba(201, 162, 39, 0.25); }
.contact-divider {
    display: flex; align-items: center; gap: 20px; max-width: 400px; margin: 0 0 32px 0;
    color: var(--text-muted); font-size: 13px; letter-spacing: 1px;
}
.contact-divider::before, .contact-divider::after { content: ''; flex: 1; height: 1px; background: var(--border-subtle); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; width: 100%; }
.contact-card {
    background: var(--bg-card); backdrop-filter: blur(8px); border: 1px solid var(--border-subtle);
    border-radius: var(--radius); padding: 20px 24px; transition: var(--transition);
    text-align: left; display: flex; align-items: center; gap: 14px;
}
.contact-card:hover { background: var(--bg-card-hover); border-color: rgba(201, 162, 39, 0.15); transform: translateY(-2px); }
.contact-card .icon {
    font-size: 20px; color: #94A3B8; width: 36px; height: 36px; display: flex; align-items: center;
    justify-content: center; flex-shrink: 0; background: rgba(148, 163, 184, 0.06); border-radius: 10px;
    border: 1px solid var(--border-subtle);
}
.contact-card .info { display: flex; flex-direction: column; gap: 1px; }
.contact-card .info .label { font-size: 12px; font-weight: 500; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.contact-card .info .value { font-size: 15px; font-weight: 500; color: var(--text-primary); }
.contact-card .info .value a { color: var(--text-primary); text-decoration: none; transition: var(--transition); }
.contact-card .info .value a:hover { color: var(--accent-gold); }

@media (max-width: 820px) {
    .navbar { padding: 0 20px; }
    .nav-availability { font-size: 12px; padding: 2px 12px; }
    .main { padding: 24px 20px 60px; }
    .hero h1 { font-size: 38px; }
    .hero-sub { font-size: 18px; }
    .typewriter-container { font-size: 18px; }
    .cert-main { padding: 24px 20px; }
    .contact-section { padding: 0 4px; }
    .contact-primary-btn { width: 100%; justify-content: center; padding: 14px 24px; font-size: 16px; }
    .contact-divider { max-width: 100%; }
    .case-title { font-size: 30px; }
    .case-error-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .hero h1 { font-size: 30px; }
    .hero-meta { flex-direction: column; align-items: center; gap: 12px; }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr 1fr; }
    .section-title { font-size: 26px; }
    .cert-main .header { flex-wrap: wrap; }
    .mini-flow-text { font-size: 9.5px; }
    .contact-sub { font-size: 15px; }
    .contact-grid { grid-template-columns: 1fr; gap: 12px; }
    .case-title { font-size: 26px; }
    .project-actions { flex-direction: column; align-items: stretch; }
    .project-actions .case-link { justify-content: center; }
    .project-actions .repo-link { justify-content: center; }
    .case-flow { height: 40px; }
    .case-flow text { font-size: 7px !important; }
}
.fade-up { opacity: 0; transform: translateY(14px); transition: opacity 0.35s ease, transform 0.35s ease; will-change: opacity, transform; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .fade-up { opacity: 1; transform: none; } }
.mailto-btn {
    display: inline-flex; align-items: center; gap: 12px; background: var(--accent-gold);
    color: #0b0b0e; padding: 14px 40px; border-radius: 40px; font-weight: 600; font-size: 16px;
    transition: var(--transition); border: none; cursor: pointer; text-decoration: none;
}
.mailto-btn:hover { background: #b89220; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(201, 162, 39, 0.2); }