/* ===================================
   DESIGN TOKENS & RESET
   =================================== */
:root {
  /* Colors — warm, muted palette */
  --bg-primary: #fafaf8;
  --bg-secondary: #f2f0ec;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #5a5a5a;
  --text-muted: #8a8a8a;
  --accent: #c47a2a;
  --accent-hover: #a8621d;
  --accent-light: rgba(196, 122, 42, 0.08);
  --border: #e4e0da;
  --border-hover: #c4c0ba;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1080px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ===================================
   NAVIGATION
   =================================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

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

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

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 8px;
}

.hero-name {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 12px;
}

.hero-role {
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 460px;
  margin-bottom: 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image img {
  width: 340px;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-image img:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(196, 122, 42, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

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

.btn-full {
  width: 100%;
}

/* ===================================
   SECTION LAYOUT
   =================================== */
.section {
  padding: 100px 24px;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 48px;
}

/* ===================================
   ABOUT SECTION
   =================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.8;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.detail-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.detail-card:last-child {
  margin-bottom: 0;
}

.detail-card h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.detail-card p {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.detail-sub {
  color: var(--text-muted) !important;
  font-size: 0.85rem !important;
  margin-top: 4px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 5px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition);
}

.tag:hover {
  background: rgba(196, 122, 42, 0.14);
  transform: translateY(-1px);
}

/* ===================================
   PROJECTS SECTION
   =================================== */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  position: relative;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.project-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--border);
  line-height: 1;
  margin-bottom: 16px;
  transition: color var(--transition);
}

.project-card:hover .project-number {
  color: rgba(196, 122, 42, 0.2);
}

.project-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.project-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ===================================
   CERTIFICATES SECTION
   =================================== */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.cert-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.cert-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.cert-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.cert-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.cert-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.cert-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  transition: letter-spacing var(--transition);
}

.cert-card:hover .cert-link {
  letter-spacing: 0.5px;
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-intro {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 32px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  color: var(--text-secondary);
  transition: border-color var(--transition), transform var(--transition);
}

.contact-item:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.contact-icon {
  font-size: 1.1rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  padding: 14px 16px;
  font-size: 0.95rem;
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

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

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(196, 122, 42, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===================================
   FOOTER
   =================================== */
#footer {
  background: var(--text-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-credit {
  font-size: 0.925rem;
  margin-bottom: 20px;
}

.footer-credit strong {
  color: #fff;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--accent);
  transition: opacity var(--transition);
}

.footer-links a:hover {
  opacity: 0.7;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero-desc {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-image {
    order: -1;
  }

  .hero-image img {
    width: 260px;
    height: 260px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 600px) {
  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  .section {
    padding: 72px 20px;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero-image img {
    width: 200px;
    height: 200px;
  }

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

  .section-title {
    margin-bottom: 36px;
  }
}

@media (max-width: 420px) {
  .nav-links {
    gap: 10px;
  }

  .nav-links a {
    font-size: 0.72rem;
  }

  .hero-name {
    font-size: 2.5rem;
  }
}