:root {
  --bg: #0a0a0f;
  --bg-2: #0d0d14;
  --surface: #111118;
  --surface-2: #16161f;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e8e8f0;
  --text-2: #a0a0b0;
  --text-3: #6a6a7a;
  --accent: #8b5cf6;
  --accent-2: #06b6d4;
  --gradient: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --gradient-soft: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --success: #10b981;
  --error: #f43f5e;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.6; font-size: 16px;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
::selection { background: var(--accent); color: white; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
section { padding: 96px 0; position: relative; }
@media (max-width: 720px) { section { padding: 64px 0; } .container { padding: 0 20px; } }

/* ====== Nav ====== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0; background: transparent;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 10, 15, 0.72);
  backdrop-filter: saturate(150%) blur(16px);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
  border-bottom-color: var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 7px;
  background: var(--gradient); display: grid; place-items: center;
  font-size: 15px; font-weight: 800; color: white;
}
.nav-links { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.nav-links a { color: var(--text-2); font-size: 14.5px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--border-strong);
  font-size: 14px; font-weight: 500; transition: all 0.2s;
}
.nav-cta:hover { background: var(--text); color: var(--bg); border-color: var(--text); }
@media (max-width: 720px) { .nav-links { gap: 16px; } .nav-links a:not(.nav-cta) { display: none; } }

/* ====== Hero ====== */
.hero { padding-top: 180px; padding-bottom: 96px; text-align: center; position: relative; overflow: hidden; }
.hero-orb {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, rgba(6, 182, 212, 0.1) 40%, transparent 70%);
  filter: blur(60px); z-index: 0; pointer-events: none;
  animation: orb-pulse 12s ease-in-out infinite;
}
@keyframes orb-pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
  50% { transform: translate(-50%, -50%) scale(1.15); opacity: 1; }
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  z-index: 0;
}
.hero-inner { position: relative; z-index: 1; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 13px; font-weight: 500; color: var(--text-2); margin-bottom: 28px;
}
.eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--success); box-shadow: 0 0 12px var(--success);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero h1 {
  font-size: clamp(40px, 6.5vw, 76px); font-weight: 700;
  letter-spacing: -0.035em; line-height: 1.05;
  max-width: 900px; margin: 0 auto 24px;
  background: linear-gradient(180deg, #ffffff 0%, #b0b0c0 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  text-wrap: balance;
}
.hero h1 .grad {
  background: var(--gradient); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: clamp(17px, 1.6vw, 20px); color: var(--text-2);
  max-width: 640px; margin: 0 auto 40px; line-height: 1.55;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 10px;
  font-size: 15px; font-weight: 500; cursor: pointer;
  border: 1px solid transparent; transition: all 0.2s;
  font-family: inherit; text-align: center;
}
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary:hover { background: white; transform: translateY(-1px); box-shadow: 0 10px 30px -5px rgba(255, 255, 255, 0.2); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--surface-2); border-color: rgba(255, 255, 255, 0.25); }
.btn .arrow { transition: transform 0.2s; }
.btn:hover .arrow { transform: translateX(2px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.hero-strip {
  margin-top: 72px; display: flex; justify-content: center;
  align-items: center; gap: 32px; flex-wrap: wrap;
  color: var(--text-3); font-size: 13.5px;
}
.hero-strip-item { display: flex; align-items: center; gap: 8px; }
.hero-strip-item svg { color: var(--success); }

/* ====== Section heading ====== */
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head h2 {
  font-size: clamp(30px, 4vw, 44px); font-weight: 700;
  letter-spacing: -0.025em; line-height: 1.15;
  margin-bottom: 16px; text-wrap: balance;
}
.section-head p { font-size: 17px; color: var(--text-2); line-height: 1.55; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }

/* ====== Services ====== */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 720px) { .services-grid { grid-template-columns: 1fr; } }
.service-card {
  position: relative; padding: 32px; border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border);
  transition: all 0.3s; overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; inset: 0;
  background: var(--gradient-soft); opacity: 0;
  transition: opacity 0.3s; z-index: 0;
}
.service-card > * { position: relative; z-index: 1; }
.service-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.service-card:hover::before { opacity: 1; }
.service-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--surface-2); border: 1px solid var(--border);
  display: grid; place-items: center; margin-bottom: 20px; color: var(--accent);
}
.service-card h3 { font-size: 21px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 8px; }
.service-card p { color: var(--text-2); font-size: 15px; line-height: 1.55; margin-bottom: 20px; }
.service-card ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.service-card li {
  font-size: 14px; color: var(--text-2);
  display: flex; align-items: center; gap: 10px;
}
.service-card li::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--accent-2); flex-shrink: 0;
}

/* ====== Process ====== */
.process { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.process-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border); border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid var(--border);
}
@media (max-width: 720px) { .process-grid { grid-template-columns: 1fr; } }
.process-step { background: var(--bg-2); padding: 32px; transition: background 0.2s; }
.process-step:hover { background: var(--surface); }
.process-step .num {
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
  color: var(--accent); font-weight: 500; margin-bottom: 16px; letter-spacing: 0.05em;
}
.process-step h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; letter-spacing: -0.01em; }
.process-step p { color: var(--text-2); font-size: 14.5px; line-height: 1.55; }

/* ====== Stack ====== */
.stack-grid { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 800px; margin: 0 auto; }
.stack-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 14px; color: var(--text-2); font-weight: 500;
  transition: all 0.2s;
}
.stack-chip:hover { border-color: var(--border-strong); color: var(--text); transform: translateY(-1px); }
.stack-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gradient); }

/* ====== CTA + Form ====== */
.cta-section { padding: 96px 0; }
.cta-box {
  position: relative; padding: 56px 48px;
  border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border-strong);
  overflow: hidden;
}
.cta-box::before {
  content: ''; position: absolute; top: 0; left: 50%;
  transform: translateX(-50%); width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.2) 0%, transparent 60%);
  filter: blur(60px); z-index: 0; pointer-events: none;
}
.cta-box > * { position: relative; z-index: 1; }
.cta-box h2 {
  font-size: clamp(28px, 3.5vw, 40px); font-weight: 700;
  letter-spacing: -0.025em; margin-bottom: 14px; text-wrap: balance; text-align: center;
}
.cta-box > p { color: var(--text-2); font-size: 17px; margin-bottom: 32px; text-align: center; max-width: 480px; margin-left: auto; margin-right: auto; }
@media (max-width: 720px) { .cta-box { padding: 40px 24px; } }

.contact-form { display: flex; flex-direction: column; gap: 16px; max-width: 600px; margin: 0 auto; }
.contact-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .contact-form .form-row { grid-template-columns: 1fr; } }
.contact-form label { display: flex; flex-direction: column; gap: 6px; }
.contact-form label span { font-size: 13px; color: var(--text-2); font-weight: 500; }
.contact-form input,
.contact-form textarea {
  width: 100%; padding: 12px 14px;
  background: var(--bg-2); border: 1px solid var(--border-strong);
  border-radius: 8px; color: var(--text); font-size: 15px;
  font-family: inherit; transition: border-color 0.2s, background 0.2s;
  resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none; border-color: var(--accent);
  background: var(--bg);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: var(--text-3); }
.contact-form .form-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 4px; }
.form-status { font-size: 14px; color: var(--text-2); }
.form-status.success { color: var(--success); }
.form-status.error { color: var(--error); }

/* ====== Newsletter ====== */
.newsletter-section { padding: 80px 0 96px; border-top: 1px solid var(--border); }
.newsletter-form {
  display: flex; gap: 8px; max-width: 540px; margin: 0 auto 16px;
  flex-wrap: wrap;
}
.newsletter-form input {
  flex: 1; min-width: 180px; padding: 12px 14px;
  background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: 8px; color: var(--text); font-size: 15px;
  font-family: inherit; transition: border-color 0.2s;
}
.newsletter-form input:focus { outline: none; border-color: var(--accent); }
.newsletter-form input::placeholder { color: var(--text-3); }
.newsletter-form .form-status { width: 100%; text-align: center; }
.newsletter-meta { text-align: center; color: var(--text-3); font-size: 14px; }
.newsletter-meta a { color: var(--text-2); text-decoration: underline; text-underline-offset: 3px; }
.newsletter-meta a:hover { color: var(--text); }

/* ====== Blog page ====== */
.page-wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.page-header { padding: 140px 0 32px; }
.page-header h1 { font-size: clamp(32px, 5vw, 48px); font-weight: 700; letter-spacing: -0.025em; margin-bottom: 12px; }
.page-header p { color: var(--text-2); font-size: 17px; }

.post-list { display: flex; flex-direction: column; gap: 24px; padding: 32px 0 80px; }
.post-card {
  display: block; padding: 24px; border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border);
  transition: all 0.2s;
}
.post-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.post-card .date { font-family: 'JetBrains Mono', monospace; font-size: 12.5px; color: var(--text-3); margin-bottom: 8px; }
.post-card h2 { font-size: 22px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 8px; }
.post-card p { color: var(--text-2); font-size: 15px; line-height: 1.55; }
.post-card .tags { display: flex; gap: 6px; margin-top: 12px; flex-wrap: wrap; }
.post-card .tag {
  font-size: 12px; padding: 2px 10px; border-radius: 999px;
  background: var(--bg-2); border: 1px solid var(--border);
  color: var(--text-3);
}

.post-content { padding: 32px 0 80px; }
.post-content h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; letter-spacing: -0.025em; margin-bottom: 8px; }
.post-content .meta { color: var(--text-3); font-size: 14px; margin-bottom: 32px; }
.post-content .body { font-size: 17px; line-height: 1.7; color: var(--text); }
.post-content .body h2 { font-size: 24px; font-weight: 600; margin: 40px 0 12px; letter-spacing: -0.015em; }
.post-content .body h3 { font-size: 19px; font-weight: 600; margin: 32px 0 10px; }
.post-content .body p { margin-bottom: 16px; }
.post-content .body code { font-family: 'JetBrains Mono', monospace; font-size: 14.5px; background: var(--surface); padding: 2px 6px; border-radius: 4px; }
.post-content .body pre { background: var(--surface); padding: 16px; border-radius: 8px; overflow-x: auto; margin-bottom: 20px; }
.post-content .body pre code { background: none; padding: 0; }
.post-content .body ul, .post-content .body ol { margin: 0 0 16px 24px; }
.post-content .body li { margin-bottom: 6px; }
.post-content .body a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }
.post-content .body blockquote { border-left: 3px solid var(--accent); padding-left: 16px; color: var(--text-2); margin: 16px 0; }
.back-link { display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); font-size: 14px; margin-bottom: 24px; }
.back-link:hover { color: var(--text); }

/* ====== Portfolio page ====== */
.project-list { display: flex; flex-direction: column; gap: 20px; padding: 32px 0 80px; }
.project-card {
  padding: 32px; border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border);
  transition: all 0.2s;
}
.project-card:hover { border-color: var(--border-strong); }
.project-card .head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 8px; flex-wrap: wrap; }
.project-card h2 { font-size: 24px; font-weight: 600; letter-spacing: -0.015em; }
.project-card .year { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-3); }
.project-card .summary { color: var(--text-2); font-size: 15.5px; margin-bottom: 16px; }
.project-card .role { font-size: 13px; color: var(--text-3); margin-bottom: 16px; }
.project-card ul { list-style: none; margin-bottom: 16px; }
.project-card li { font-size: 14.5px; color: var(--text-2); padding: 4px 0; padding-left: 18px; position: relative; }
.project-card li::before { content: '→'; position: absolute; left: 0; color: var(--accent); }
.project-card .stack { display: flex; gap: 6px; flex-wrap: wrap; }
.project-card .stack span {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  background: var(--bg-2); border: 1px solid var(--border); color: var(--text-2); font-family: 'JetBrains Mono', monospace;
}

/* ====== Admin ====== */
.admin-wrap { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.admin-header { padding: 110px 0 24px; display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 12px; }
.admin-header h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
.admin-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.admin-tab { padding: 10px 16px; background: none; border: none; color: var(--text-2); font-size: 14px; cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.2s; font-family: inherit; }
.admin-tab.active { color: var(--text); border-bottom-color: var(--accent); }
.admin-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 32px; }
.stat-card { padding: 20px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.stat-card .label { font-size: 12px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px; }
.stat-card .value { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
.stat-card .value small { font-size: 14px; color: var(--text-3); font-weight: 400; margin-left: 4px; }
.admin-section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.admin-section h3 { font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.admin-table th, .admin-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
.admin-table th { color: var(--text-3); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.admin-table tr:last-child td { border-bottom: none; }
.bar-chart { display: flex; align-items: flex-end; gap: 6px; height: 100px; padding: 12px 0; }
.bar { flex: 1; background: var(--gradient); border-radius: 4px 4px 0 0; min-height: 2px; transition: opacity 0.2s; position: relative; }
.bar:hover { opacity: 0.8; }
.bar-labels { display: flex; gap: 6px; font-size: 11px; color: var(--text-3); }
.bar-labels span { flex: 1; text-align: center; }
.empty { color: var(--text-3); font-style: italic; padding: 24px; text-align: center; }

/* ====== Footer ====== */
footer { border-top: 1px solid var(--border); padding: 40px 0; color: var(--text-3); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--text); }

/* ====== Motion ====== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}
.fade-in { opacity: 0; transform: translateY(12px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: none; }