:root {
  --bg: #060b18;
  --bg-soft: #0a1224;
  --bg-gradient-start: #0e1d3e;
  --card: rgba(15, 27, 52, 0.72);
  --text: #e7eefc;
  --muted: #9cb0d3;
  --line: rgba(120, 155, 214, 0.2);
  --primary: #2d85ff;
  --secondary: #00d08a;
  --gold: #d0ab47;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] {
  --bg: #f4f7fe;
  --bg-soft: #e8eefc;
  --bg-gradient-start: #dbe7ff;
  --card: rgba(255, 255, 255, 0.9);
  --text: #0a1833;
  --muted: #425b84;
  --line: rgba(43, 95, 178, 0.2);
  --primary: #1f6fff;
  --secondary: #00b073;
  --gold: #b08b2f;
  --shadow: 0 10px 24px rgba(21, 47, 89, 0.14);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background: radial-gradient(circle at 20% 5%, var(--bg-gradient-start) 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.6;
}

.background-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(61, 96, 158, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 96, 158, 0.09) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 95%);
  z-index: -2;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.section {
  padding: 5.2rem 0;
}

.section-title {
  margin: 0 0 1.4rem;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
}

.section-text {
  color: var(--muted);
  max-width: 900px;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  border-bottom: 1px solid var(--line);
  z-index: 99;
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 0;
  margin: 0;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a.active-link {
  color: #cfe1ff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.theme-toggle {
  font-size: 1rem;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

.menu-toggle {
  display: none;
  font-size: 1.2rem;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
}

.hero {
  padding-top: 6.5rem;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2.2rem;
  align-items: center;
}

.eyebrow {
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.12;
  margin: 0;
}

h2 {
  margin: 0.8rem 0 1.2rem;
  color: var(--muted);
  font-weight: 500;
  font-size: clamp(1rem, 2.4vw, 1.25rem);
}

h2 span {
  color: #c5d7ff;
}

.hero-tagline {
  max-width: 760px;
  margin-bottom: 1.5rem;
  color: var(--muted);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-decoration: none;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 0.72rem 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--primary), #1f5fdd);
  box-shadow: 0 8px 20px rgba(45, 133, 255, 0.35);
}

.btn-secondary {
  color: #021521;
  background: linear-gradient(135deg, #00f2a4, #00c685);
  box-shadow: 0 8px 20px rgba(0, 208, 138, 0.25);
}

.btn-ghost {
  color: var(--text);
  background: rgba(13, 24, 47, 0.66);
  border-color: var(--line);
}

.hero-panel {
  display: grid;
  gap: 0.9rem;
}

.metric-card,
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.metric-card {
  position: relative;
  overflow: hidden;
}

.metric-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--gold));
}

.chart-card {
  padding-bottom: 0.85rem;
}

.profile-card {
  padding: 0.8rem;
}

.profile-photo {
  display: block;
  width: 100%;
  max-width: 260px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid rgba(120, 155, 214, 0.42);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.mini-chart {
  width: 100%;
  height: auto;
  margin-top: 0.5rem;
}

.chart-axis {
  stroke: rgba(132, 164, 225, 0.35);
  stroke-width: 1;
}

.chart-line {
  fill: none;
  stroke: var(--secondary);
  stroke-width: 2.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-line.animate {
  animation: drawLine 1.7s ease-out forwards;
}

@keyframes drawLine {
  from {
    stroke-dashoffset: var(--path-length, 0);
  }
  to {
    stroke-dashoffset: 0;
  }
}

.metric-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-value {
  margin: 0.2rem 0 0;
  font-size: 1.05rem;
  font-weight: 650;
}

.grid {
  display: grid;
  gap: 1rem;
}

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

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card h4 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.subtitle {
  color: #c8d6f2;
  margin-bottom: 0.75rem !important;
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.project-meta {
  font-size: 0.9rem;
  color: #b8c9e8 !important;
}

.project-link {
  color: #9ec5ff;
  text-decoration: none;
  font-weight: 600;
}

.project-link:hover {
  color: #d2e5ff;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tags span {
  font-size: 0.77rem;
  color: #cde0ff;
  border: 1px solid rgba(93, 142, 220, 0.4);
  background: rgba(23, 41, 78, 0.85);
  border-radius: 100px;
  padding: 0.2rem 0.55rem;
}

.full-width {
  grid-column: span 2;
}

.roadmap {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  max-width: 880px;
}

.roadmap li {
  padding-left: 0.15rem;
}

.roadmap li + li {
  margin-top: 0.6rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem 1rem;
  margin: 1rem 0 1.2rem;
}

.contact-grid a {
  color: #9bc3ff;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}

.contact-form {
  margin-top: 0.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.hp-field {
  position: absolute;
  left: -9999px;
  top: -9999px;
  opacity: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.contact-form label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.contact-form span {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  color: var(--text);
  padding: 0.75rem 0.85rem;
  outline: none;
}

.contact-form textarea {
  resize: vertical;
  min-height: 130px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(107, 168, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(45, 133, 255, 0.16);
}

.form-actions {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.35rem;
}

.form-note {
  margin: 0;
  color: var(--muted) !important;
  font-size: 0.9rem;
}

.form-note a {
  color: #9bc3ff;
}

.form-status {
  margin: 0.7rem 0 0;
  font-weight: 650;
  color: #cfe1ff;
}

.form-status.error {
  color: #ffb4b4;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.2rem 0 2rem;
  color: var(--muted);
}

/* Reveal animation classes managed by script.js */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.card,
.metric-card {
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover,
.metric-card:hover {
  transform: translateY(-4px);
  border-color: rgba(107, 168, 255, 0.45);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.45);
}

/* Responsive styles */
@media (max-width: 980px) {
  .hero-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    right: 4vw;
    top: 72px;
    width: min(250px, 90vw);
    display: none;
    flex-direction: column;
    padding: 0.85rem;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: rgba(10, 18, 36, 0.98);
  }

  .nav-links.open {
    display: flex;
  }

  .two-col,
  .three-col,
  .contact-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .full-width {
    grid-column: auto;
  }

  .section {
    padding: 4.2rem 0;
  }
}