/* ── CSS Reset ── */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ── CSS Custom Properties ── */
:root {
  --bg: #faf9f7;
  --surface: #f0efe9;
  --surface-hover: #e8e6df;
  --border: #e0ddd6;
  --border-dark: #c8c4bb;
  --text: #1a1916;
  --muted: #5c5a55;
  --muted-light: #9c9990;
  --accent: #4a6fa5;
  --accent-dim: rgba(74, 111, 165, 0.08);
  --accent-hover: #3a5a8a;
  --font-sans: "Inter", sans-serif;
  --radius: 6px;
  --radius-lg: 10px;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ── Utility ── */
.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Nav ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(250, 249, 247, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav-links {
  list-style: none;
  display: flex;
  gap: 2.25rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.15s;
}

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

/* Hamburger (hidden on desktop) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text);
  transition: all 0.3s;
}

/* Mobile nav open state */
.nav-links.open {
  display: flex;
}

/* ── Sections (shared) ── */
section {
  padding: 8rem 0;
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 1.75rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

/* ── About ── */
#about {
  padding-top: 10rem;
  background-color: var(--surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--muted);
  margin-bottom: 1.1rem;
  font-size: 1rem;
  line-height: 1.8;
}

.about-text p strong {
  color: var(--text);
  font-weight: 600;
}

.about-image {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  align-items: flex-start;
}

.profile-photo {
  width: 100%;
  max-width: 260px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: none;
  background-color: var(--border);
  display: block;
}

/* Skill pills */
.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-pill {
  background-color: var(--accent);
  border: 1px solid var(--accent);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  letter-spacing: 0.01em;
}

/* CTA buttons */
.btn-group {
  display: flex;
  gap: 0.875rem;
  flex-wrap: wrap;
  margin-top: 2.25rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.825rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
  border: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(74, 111, 165, 0.25);
}

.btn-outline {
  background-color: transparent;
  color: var(--muted);
  border: 1px solid var(--border-dark);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Projects ── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.project-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(74, 111, 165, 0.1);
}

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.625rem;
}

.project-card p {
  color: var(--muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.tag {
  font-size: 0.685rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-dim);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  letter-spacing: 0.04em;
}

.project-links {
  display: flex;
  gap: 1.25rem;
  margin-top: auto;
}

.project-links a {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius);
  padding: 0.35rem 0.85rem;
  transition: all 0.15s;
}

.project-links a:hover {
  background-color: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

/* ── Skills ── */
.skills-section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
}

.skill-category {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.skill-category h4 {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.skill-category ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.skill-category li {
  color: var(--muted);
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.skill-category li::before {
  content: "";
  display: block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: var(--accent);
  flex-shrink: 0;
}

/* ── Contact ── */
.contact-wrapper {
  max-width: 560px;
}

.contact-wrapper p {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 1rem 1.25rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.15s;
}

.contact-link:hover {
  color: var(--text);
  border-color: var(--accent);
  background-color: var(--bg);
}

.contact-link .label {
  font-size: 0.67rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  width: 58px;
}

/* ── Contact form ── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info p {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.form-group input,
.form-group textarea {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text);
  transition: border-color 0.15s;
  resize: none;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted-light);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-submit {
  align-self: flex-start;
}

.form-success {
  display: none;
  background-color: var(--accent-dim);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.form-success p {
  color: var(--accent);
  font-size: 0.9375rem;
  font-weight: 500;
  margin: 0;
}

@media (max-width: 700px) {
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

/* ── Footer ── */
footer {
  padding: 3rem 2rem;
  text-align: center;
  color: var(--muted-light);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ── Fade-up animation ── */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 700px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 1.25rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .skills-section-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .skills-section-grid {
    grid-template-columns: 1fr;
  }

  h2 {
    font-size: 2.1rem;
  }
}