:root {
  --bg: #050816;
  --bg-alt: #0b1020;
  --card: rgba(15, 23, 42, 0.9);
  --accent: #22c55e;
  --accent-soft: rgba(34, 197, 94, 0.12);
  --accent-2: #38bdf8;
  --text-main: #e5e7eb;
  --text-soft: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.65);
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.3s ease-out;
}

[data-theme="light"] {
  --bg: #f3f4f6;
  --bg-alt: #ffffff;
  --card: rgba(255, 255, 255, 0.95);
  --accent: #16a34a;
  --accent-soft: rgba(34, 197, 94, 0.12);
  --accent-2: #0284c7;
  --text-main: #111827;
  --text-soft: #4b5563;
  --border-subtle: rgba(209, 213, 219, 0.9);
  --shadow-soft: 0 18px 30px rgba(15, 23, 42, 0.1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at top, #111827 0, var(--bg) 45%, #020617 100%);
  color: var(--text-main);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
}

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 6vw;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.75), transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.logo {
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav a {
  position: relative;
  text-decoration: none;
  color: var(--text-soft);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width var(--transition-fast);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--text-main);
}

.nav a:hover::after,
.nav a:focus-visible::after {
  width: 100%;
}

.theme-toggle {
  border: 1px solid var(--border-subtle);
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.18), rgba(15, 23, 42, 0.95));
  color: var(--text-main);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.6);
}

.theme-toggle__icon {
  font-size: 1.1rem;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.2fr);
  gap: 3rem;
  padding: 5rem 6vw 3rem;
  align-items: center;
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
}

.hero__title {
  font-size: clamp(2.3rem, 3.4vw + 1rem, 3.6rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}

.highlight {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  color: transparent;
  position: relative;
}

.hero__typing {
  display: block;
  margin-top: 0.35rem;
  font-size: 1.1rem;
  color: var(--text-soft);
  min-height: 1.4em;
}

.hero__subtitle {
  margin-top: 0.5rem;
  color: var(--text-soft);
  max-width: 40rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.75rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b1120;
  box-shadow: var(--shadow-soft);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(34, 197, 94, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn--ghost:hover {
  background: rgba(15, 23, 42, 0.7);
}

.btn--large {
  padding: 0.95rem 2.4rem;
  font-size: 1rem;
}

.btn--full {
  width: 100%;
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(148, 163, 184, 0.35);
  font-size: 0.85rem;
}

.meta-label {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
  font-size: 0.72rem;
}

.meta-value {
  display: block;
  margin-top: 0.25rem;
}

/* Hero photo card */
.hero__photo-card {
  display: flex;
  justify-content: center;
}

.photo-wrapper {
  position: relative;
  padding: 0.4rem;
  border-radius: var(--radius-xl);
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.25), rgba(15, 23, 42, 0.95));
  box-shadow: var(--shadow-soft);
  max-width: 320px;
  width: 100%;
}

.hero__photo {
  display: block;
  width: 100%;
  border-radius: calc(var(--radius-xl) - 0.3rem);
  border: 1px solid rgba(148, 163, 184, 0.55);
}

.photo-badge {
  position: absolute;
  right: -1rem;
  left: auto;
  padding: 0.6rem 0.85rem;
  border-radius: 1rem;
  background: var(--card);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.5);
  max-width: 210px;
}

.photo-badge--primary {
  top: 1.4rem;
}

.photo-badge--secondary {
  bottom: 1.4rem;
}

.badge-label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.badge-value {
  font-size: 0.8rem;
}

/* Sections */
.section {
  padding: 3.5rem 6vw;
}

.section--alt {
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.85), var(--bg-alt));
}

.section__header {
  max-width: 42rem;
  margin: 0 auto 2.5rem;
  text-align: center;
}

.section__header h2 {
  font-size: 1.9rem;
  margin-bottom: 0.5rem;
}

.section__header p {
  color: var(--text-soft);
  margin: 0;
}

.grid {
  display: grid;
}

.grid--2cols {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.align-center {
  align-items: center;
}

.align-start {
  align-items: flex-start;
}

.gap-lg {
  gap: 2.5rem;
}

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.75rem 1.9rem;
  box-shadow: var(--shadow-soft);
}

.card--glass {
  backdrop-filter: blur(18px);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.85rem;
}

.card p {
  margin-top: 0.3rem;
  color: var(--text-soft);
}

/* Skills */
.skills-group {
  margin-bottom: 1.5rem;
}

.skills-group h3 {
  margin-bottom: 0.45rem;
  font-size: 1.1rem;
}

.skills-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.skills-group li {
  position: relative;
  padding-left: 1.2rem;
  margin-bottom: 0.35rem;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.skills-group li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Chart */
.chart-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.8rem 1.8rem 1.3rem;
  box-shadow: var(--shadow-soft);
}

.chart-card h3 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.chart-caption {
  margin-top: 0.85rem;
  color: var(--text-soft);
  font-size: 0.8rem;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.9rem;
}

.project-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.7rem 1.7rem 1.4rem;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.project-card__badge {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  background: var(--accent-soft);
  color: var(--accent);
}

.project-card h3 {
  margin-top: 0.4rem;
  margin-bottom: 0.6rem;
}

.project-card p {
  margin: 0.3rem 0 0.8rem;
  color: var(--text-soft);
  font-size: 0.93rem;
}

.project-card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0;
  margin: 0 0 0.8rem;
  list-style: none;
}

.project-card__stack li {
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.55);
}

.project-card__role {
  margin: 0;
  font-size: 0.86rem;
}

/* Timeline */
.timeline {
  position: relative;
  margin: 0 auto;
  max-width: 720px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 1.1rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2));
  opacity: 0.4;
}

.timeline__item {
  position: relative;
  padding-left: 3rem;
  margin-bottom: 2rem;
}

.timeline__dot {
  position: absolute;
  left: 0.7rem;
  top: 0.3rem;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.2);
}

.timeline__content {
  background: var(--card);
  border-radius: 1.1rem;
  border: 1px solid var(--border-subtle);
  padding: 1.1rem 1.3rem;
  box-shadow: var(--shadow-soft);
}

.timeline__content h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
}

.timeline__period {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.timeline__content p {
  margin-top: 0.5rem;
  color: var(--text-soft);
  font-size: 0.9rem;
}

/* CTA */
.section--cta {
  text-align: center;
  padding: 4rem 6vw 3rem;
  background: radial-gradient(circle at top, rgba(34, 197, 94, 0.18), rgba(15, 23, 42, 0.98));
}

.section--cta .section__header {
  margin-bottom: 2rem;
}

.cta-actions {
  display: flex;
  justify-content: center;
}

/* Contact */
.contact-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.8rem 1.9rem;
}

.contact-card h3 {
  margin-top: 0;
  margin-bottom: 0.9rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.contact-list li {
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.contact-list span {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.contact-note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.contact-form {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 1.8rem 1.9rem;
  box-shadow: var(--shadow-soft);
}

.contact-form .form-row {
  margin-bottom: 1rem;
}

.contact-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.86rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-main);
  outline: none;
  font-family: inherit;
  font-size: 0.9rem;
}

[data-theme="light"] .contact-form input,
[data-theme="light"] .contact-form textarea {
  background: #f9fafb;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.5);
}

.form-hint {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-soft);
}

/* Footer */
.footer {
  padding: 1.5rem 6vw 2.2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-soft);
  border-top: 1px solid rgba(15, 23, 42, 0.9);
  background: linear-gradient(to top, rgba(15, 23, 42, 0.98), transparent);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-med), transform var(--transition-med);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 4rem;
  }

  .hero__photo-card {
    order: -1;
  }

  .hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--2cols {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 720px) {
  .topbar {
    padding-inline: 1.25rem;
    gap: 0.75rem;
  }

  .nav {
    display: none;
  }

  .hero {
    padding-inline: 1.25rem;
  }

  .section {
    padding-inline: 1.25rem;
  }

  .section--cta {
    padding-inline: 1.25rem;
  }

  .hero__meta {
    grid-template-columns: minmax(0, 1fr);
  }

  .timeline::before {
    left: 0.7rem;
  }

  .timeline__item {
    padding-left: 2.5rem;
  }
}