/* =====================================================
   SECTIONS — header · hero · about · projects · skills
               contact · footer
   ===================================================== */

/* ══════════════════════════════
   HEADER
══════════════════════════════ */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1.1rem 0;
  transition: background var(--t-normal), backdrop-filter var(--t-normal), box-shadow var(--t-normal);
}
#header.scrolled {
  background: rgba(234, 230, 222, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--glass-border);
}
[data-theme="dark"] #header.scrolled {
  background: rgba(28, 25, 23, 0.90);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  flex-shrink: 0;
  transition: color var(--t-normal);
}
.logo:hover .logo-dot { color: var(--accent-1); }
.logo-dot { color: var(--accent-1); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin-left: auto;
}
.nav-link {
  display: block;
  padding: 0.4rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--r-full);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--glass-bg-light);
}
.nav-link.active { color: var(--accent-1); }

.header-cta { margin-left: 0.5rem; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--t-normal), opacity var(--t-fast);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  top: 0; right: 0;
  width: min(300px, 80vw);
  height: 100vh;
  background: rgba(28, 25, 23, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--glass-border);
  z-index: 999;
  transform: translateX(100%);
  transition: transform var(--t-slow);
  display: flex;
  align-items: center;
  justify-content: center;
}
.mobile-nav.open { transform: translateX(0); }

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: center;
}
.mobile-nav-links .nav-link {
  font-size: 1.2rem;
  padding: 0.7rem 2rem;
}

/* ══════════════════════════════
   HERO SCROLL WRAPPER
══════════════════════════════ */
.hero-scroll-wrapper {
  height: 200vh;
  position: relative;
}

/* ── Cursive name splash ── */
.name-splash {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  pointer-events: none;
  will-change: opacity, transform;
}
.name-splash-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.name-cursive {
  font-family: 'Dancing Script', cursive;
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 700;
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  text-align: center;
  letter-spacing: -0.01em;
}
.name-hint {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0;
  animation: hintFade 1s ease 1.5s forwards;
}
@keyframes hintFade {
  to { opacity: 1; }
}

/* ── Scroll-in hero content ── */
.hero-content-layer {
  position: absolute;
  inset: 0;
  opacity: 0;
  will-change: opacity, transform;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
}


/* ══════════════════════════════
   SECTION FADE-IN
══════════════════════════════ */
.section {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.75s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.75s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.section.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ══════════════════════════════
   HERO
══════════════════════════════ */
.hero {
  height: 100vh;
  position: sticky;
  top: 0;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  width: 100%;
}

/* Hero text */
.hero-greeting {
  display: inline-block;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.hero-name {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', 'Inter', sans-serif;
  font-size: clamp(3.8rem, 9vw, 7rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 0.95;
  margin-bottom: 1rem;
  letter-spacing: -0.04em;
}

.hero-role {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  min-height: 2rem;
}
.typewriter-text { color: var(--accent-1); font-weight: 600; }

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 480px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-socials {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  border-radius: var(--r-full);
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  transition: color var(--t-fast), border-color var(--t-fast), transform var(--t-spring);
}
.social-pill:hover {
  color: var(--text-primary);
  border-color: var(--glass-border-glow);
  transform: translateY(-2px);
}

/* Hero avatar */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.avatar-wrapper {
  position: relative;
  width: 340px;
  height: 400px;
}
.avatar {
  position: absolute;
  inset: 0;
  border-radius: var(--r-xl);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 8%;
  display: block;
}
.avatar-initials {
  font-size: 4rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.04em;
}
.avatar-ring {
  position: absolute;
  inset: -6px;
  border-radius: calc(var(--r-xl) + 6px);
  border: 2px solid transparent;
  background:
    linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
    var(--grad-warm) border-box;
  animation: ringRotate 8s linear infinite;
}
.avatar-ring-2 {
  inset: -14px;
  border-width: 1px;
  animation: ringRotate 12s linear infinite reverse;
  opacity: 0.4;
}
@keyframes ringRotate {
  to { transform: rotate(360deg); }
}
.avatar-badge {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(7,7,26,0.9);
  border: 1px solid rgba(16,185,129,0.4);
  border-radius: var(--r-full);
  padding: 0.3rem 0.9rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #10b981;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.status-dot {
  font-size: 0.5rem;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* Scroll indicator */
.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--t-fast);
  animation: bounceDown 2.5s ease-in-out infinite;
}
.scroll-down:hover { color: var(--accent-1); }
.scroll-arrow { font-size: 0.9rem; }
@keyframes bounceDown {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ══════════════════════════════
   ABOUT
══════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-bio p {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
}
.about-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat-card {
  padding: 1.5rem 1rem;
  text-align: center;
  border-radius: var(--r-lg);
  transition: transform var(--t-spring), box-shadow var(--t-normal);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--glass-border-glow);
}
.stat-number {
  display: block;
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-primary);
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stat-plus {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-1);
  vertical-align: top;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 0.4rem;
}

/* ══════════════════════════════
   PROJECTS
══════════════════════════════ */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: var(--sp-md);
  flex-wrap: wrap;
}
.filter-btn {
  padding: 0.5rem 1.4rem;
  border-radius: var(--r-full);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-light);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-normal);
}
.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--glass-border-glow);
}
.filter-btn.active {
  background: var(--grad-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px var(--glow-1);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.12s ease, box-shadow var(--t-normal);
  will-change: transform;
}
.project-card:not(:hover) {
  transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1), box-shadow var(--t-normal);
}
.project-card:hover { box-shadow: 0 24px 60px rgba(0,0,0,0.5), 0 0 0 1px var(--glass-border-glow); }

.project-image {
  position: relative;
  height: 180px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.project-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.15);
  transition: background var(--t-normal);
}
.project-card:hover .project-image::after { background: rgba(0,0,0,0.05); }
.project-image-inner { position: relative; z-index: 1; }
.project-icon { font-size: 2.8rem; color: rgba(255,255,255,0.85); }

.project-badge {
  position: absolute;
  top: 12px; right: 12px;
  z-index: 2;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--r-full);
  padding: 0.2rem 0.65rem;
}

.project-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}
.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.project-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.project-links {
  display: flex;
  gap: 0.6rem;
  margin-top: 0.25rem;
}

/* Hidden/filtered cards */
.project-card.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95);
}
.project-card.filtered-out {
  display: none;
}

/* ══════════════════════════════
   SKILLS
══════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.skill-category {
  padding: 2rem;
  transition: transform var(--t-spring), box-shadow var(--t-normal);
}
.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--glass-border-glow);
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.skill-category-title i { color: var(--accent-1); }

.skill-list { display: flex; flex-direction: column; gap: 1rem; }

.skill-item {}
.skill-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}
.skill-meta span:last-child { color: var(--accent-1); font-weight: 600; }

.skill-bar {
  height: 4px;
  background: rgba(28, 25, 23, 0.08);
  border-radius: var(--r-full);
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--grad-warm);
  border-radius: var(--r-full);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ══════════════════════════════
   CERTIFICATES
══════════════════════════════ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
}
.cert-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--r-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--t-spring), box-shadow var(--t-normal), border-color var(--t-normal);
  position: relative;
}
.cert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
  border-color: var(--glass-border-glow);
}

/* Thumbnail */
.cert-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--glass-bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--glass-border);
  font-size: 2.5rem;
  color: var(--accent-2);
}
.cert-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--t-slow);
}
.cert-card:hover .cert-thumb img { transform: scale(1.04); }

/* Info row */
.cert-card .cert-info {
  flex: 1;
  padding: 1rem 1.25rem 0.75rem;
  min-width: 0;
}
.cert-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  line-height: 1.3;
}
.cert-issuer {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}
.cert-badge {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: var(--glass-bg-dark);
  border-top: 1px solid var(--glass-border);
  padding: 0.45rem 1.25rem;
  display: block;
  width: 100%;
}

/* View Certificate button */
.cert-view {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin: 0 1.25rem 1.25rem;
  padding: 0.55rem 1rem;
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-2);
  transition: background var(--t-fast), border-color var(--t-fast);
}
.cert-view:hover {
  background: var(--glass-border-glow);
  border-color: var(--accent-2);
}

@media (max-width: 768px) {
  .cert-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════
   CONTACT
══════════════════════════════ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-info { display: flex; flex-direction: column; gap: 1rem; }

.contact-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.2rem 1.5rem;
  transition: transform var(--t-spring), border-color var(--t-normal);
}
.contact-item:hover {
  transform: translateX(4px);
  border-color: var(--glass-border-glow);
}
.contact-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-1);
  font-size: 1.05rem;
  flex-shrink: 0;
}
.contact-item h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}
.contact-item a, .contact-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--t-fast);
}
.contact-item a:hover { color: var(--accent-1); }

.contact-socials {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* Form */
.contact-form { padding: 2rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1.1rem; }
.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}
.form-input {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  resize: vertical;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}
textarea.form-input { min-height: 120px; }

.form-success {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: var(--r-md);
  color: #10b981;
  font-size: 0.875rem;
  font-weight: 500;
}
.form-success.visible { display: flex; }

/* ══════════════════════════════
   FOOTER
══════════════════════════════ */
.footer {
  border-top: 1px solid var(--glass-border);
  padding: 3rem 0 2rem;
  margin-top: var(--sp-lg);
}
.footer-inner { display: flex; flex-direction: column; gap: 2rem; }

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--t-fast);
}
.footer-nav a:hover { color: var(--text-primary); }

.footer-socials { display: flex; gap: 0.75rem; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--glass-border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ══════════════════════════════
   RESPONSIVE
══════════════════════════════ */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links, .header-cta { display: none; }
  .hamburger { display: flex; }

  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { order: -1; }
  .hero-bio { margin: 0 auto 2rem; }
  .hero-actions, .hero-socials { justify-content: center; }
  .avatar-wrapper { width: 260px; height: 310px; }

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

  .footer-top { flex-direction: column; align-items: flex-start; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .projects-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}