:root {
  --bg: #0a0e17;
  --bg-elevated: #111726;
  --card: #141b2c;
  --border: #232c42;
  --text: #e7ebf5;
  --text-dim: #8b96ad;
  --accent: #4f8cff;
  --accent-2: #7ee0c3;
  --accent-warm: #ffb85c;
  --font-head: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --max-width: 1100px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(79, 140, 255, 0.12), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(126, 224, 195, 0.08), transparent 40%),
    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: auto, auto, 48px 48px, 48px 48px;
}

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 6vw;
  background: rgba(10, 14, 23, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 1px;
}
.logo span { color: var(--accent); }

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

.nav-links a {
  font-size: 0.92rem;
  color: var(--text-dim);
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  padding: 8px 18px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--text) !important;
}
.nav-cta:hover { background: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* HERO */
.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 6vw;
  position: relative;
}

.hero-inner { max-width: 760px; }

.eyebrow {
  color: var(--accent-2);
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 16px;
  animation: fadeUp 0.6s ease both;
}

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.05;
  background: linear-gradient(120deg, #fff, var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fadeUp 0.6s ease 0.05s both;
}

.typewriter {
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 3vw, 1.6rem);
  color: var(--text-dim);
  margin: 14px 0 24px;
  font-weight: 500;
  min-height: 1.6em;
}
.cursor { animation: blink 1s step-end infinite; color: var(--accent); }

.hero-summary {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 620px;
  margin: 0 auto 32px;
  animation: fadeUp 0.6s ease 0.15s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
  animation: fadeUp 0.6s ease 0.2s both;
}

.btn {
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  display: inline-block;
}
.btn-primary {
  background: linear-gradient(120deg, var(--accent), #6aa4ff);
  color: #06101f;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(79,140,255,0.35); }
.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); transform: translateY(-2px); }

.hero-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  animation: fadeUp 0.6s ease 0.25s both;
}
.hero-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.hero-links a:hover { color: var(--accent-2); border-color: var(--accent-2); }

.scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.scroll-cue span { animation: bounce 1.6s ease-in-out infinite; }

/* SECTIONS */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 110px 6vw;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.section.in-view { opacity: 1; transform: translateY(0); }

.section-tag {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 44px;
}

/* ABOUT */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text { color: var(--text-dim); font-size: 1.05rem; }

.about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.fact {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  text-align: center;
}
.fact-num {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-2);
}
.fact-label {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* SKILLS */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.skill-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.skill-card h3 {
  font-family: var(--font-head);
  margin-bottom: 16px;
  font-size: 1.1rem;
  color: var(--accent-2);
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
}

/* TIMELINE */
.timeline {
  position: relative;
  border-left: 2px solid var(--border);
  padding-left: 36px;
}
.timeline-item {
  position: relative;
  margin-bottom: 48px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -43px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}
.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}
.timeline-head h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
}
.timeline-date {
  color: var(--accent-warm);
  font-size: 0.85rem;
  font-weight: 600;
}
.timeline-org {
  color: var(--accent-2);
  font-weight: 600;
  font-size: 0.92rem;
  margin: 4px 0 12px;
}
.timeline-content ul li {
  color: var(--text-dim);
  font-size: 0.94rem;
  padding-left: 18px;
  position: relative;
  margin-bottom: 8px;
}
.timeline-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* PROJECTS */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
}
.project-title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
}
.project-desc {
  color: var(--text-dim);
  font-size: 0.88rem;
  flex-grow: 1;
}
.project-link {
  color: var(--accent-2);
  font-size: 0.85rem;
  font-weight: 600;
}
.project-link:hover { color: var(--accent); }

/* CERT / EDU */
.cert-edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.cert-block h3 {
  font-family: var(--font-head);
  color: var(--accent-2);
  margin-bottom: 20px;
  font-size: 1.15rem;
}
.cert-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-dim);
  font-size: 0.92rem;
}
.cert-list li strong { color: var(--text); font-weight: 600; }
.cert-list li span { color: var(--accent-warm); white-space: nowrap; }

.edu-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}
.edu-item h4 { font-family: var(--font-head); margin-bottom: 6px; }
.edu-item p { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 6px; }
.edu-item span { color: var(--accent-warm); font-size: 0.82rem; font-weight: 600; }

/* CONTACT */
.contact-section { text-align: center; }
.contact-sub {
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 44px;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.contact-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.contact-label {
  color: var(--text-dim);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.contact-value {
  font-weight: 600;
  font-size: 0.95rem;
  word-break: break-word;
}

/* CONTACT FORM */
.contact-form {
  max-width: 640px;
  margin: 56px auto 0;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}
.form-title {
  font-family: var(--font-head);
  font-size: 1.2rem;
  margin-bottom: 20px;
  text-align: center;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.form-field label {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-weight: 500;
}
.form-field input,
.form-field textarea {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.2s ease;
}
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-submit {
  width: 100%;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
}
.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}
.form-status {
  margin-top: 14px;
  text-align: center;
  font-size: 0.9rem;
  min-height: 1.2em;
}
.form-status.success { color: var(--accent-2); }
.form-status.error { color: #ff6b6b; }

@media (max-width: 560px) {
  .form-row { grid-template-columns: 1fr; }
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 32px 6vw 60px;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.2s ease, border-color 0.2s ease;
  z-index: 90;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { border-color: var(--accent); transform: translateY(-3px); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes blink {
  50% { opacity: 0; }
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* RESPONSIVE */
@media (max-width: 860px) {
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    flex-direction: column;
    padding: 20px 6vw 28px;
    border-bottom: 1px solid var(--border);
    display: none;
    gap: 18px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .about-grid, .cert-edu-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .projects-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .section { padding: 80px 6vw; }
}