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

/* === Tokens === */
:root {
  --bg:     #ffffff;
  --bg2:    #f6f6f6;
  --text:   #0c0c0c;
  --muted:  #aaaaaa;
  --border: #e4e4e4;
  --ease:   cubic-bezier(0.16, 1, 0.3, 1);
}

/* === Scroll snap container === */
html {
  height: 100%;
  scroll-snap-type: y mandatory;
  overflow-y: scroll;
  scroll-behavior: smooth;
}

body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 2px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); }

/* === Header === */
#header {
  position: fixed;
  top: 0; right: 0; left: 0;
  z-index: 200;
  padding: 1.4rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  pointer-events: none;
}

#lang-toggle {
  pointer-events: auto;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  border-radius: 2px;
  text-transform: uppercase;
  transition: color 0.2s, border-color 0.2s;
}
#lang-toggle:hover { color: var(--text); border-color: #bbb; }

/* === HERO (snap section) === */
#hero {
  height: 100vh;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--bg);
}

.hero-inner {
  max-width: 860px;
  width: 100%;
  padding: 0 2.5rem;
}

.hero-name {
  display: flex;
  flex-direction: column;
}

.hero-name .line {
  font-size: clamp(4.2rem, 14vw, 11rem);
  font-weight: 900;
  line-height: 0.88;
  letter-spacing: -0.04em;
  color: var(--text);
  font-style: italic;
  display: block;
}

/* Scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-bar {
  width: 1px;
  height: 52px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}

.scroll-bar::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--muted), transparent);
  animation: scrollDown 1.8s ease-in-out infinite;
}

@keyframes scrollDown {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* === PROJECTS (snap section) === */
#projects {
  min-height: 100vh;
  scroll-snap-align: start;
  background: var(--bg2);
  padding: 7rem 2.5rem 5rem;
  position: relative;
}

.projects-inner {
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  overflow: hidden;
}

.section-label {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2.5rem;
  display: block;
}

/* === Project list === */
.project-list { list-style: none; }

.project-item {
  border-top: 1px solid var(--border);
}
.project-item:last-child { border-bottom: 1px solid var(--border); }

.project-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: var(--text);
  padding: 1.1rem 0;
  gap: 1.5rem;
}

.proj-name {
  font-size: clamp(1.8rem, 5vw, 3.8rem);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.035em;
  line-height: 1;
  transition: opacity 0.2s;
}

.proj-arr {
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  color: var(--muted);
  flex-shrink: 0;
  transition: transform 0.3s var(--ease), color 0.2s;
}

.project-item:hover .proj-name { opacity: 0.38; }
.project-item:hover .proj-arr  { transform: translate(4px, -4px); color: var(--text); }

.proj-desc {
  padding-bottom: 1rem;
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.5;
}

/* Skeleton */
.skel { border-top: 1px solid var(--border); padding: 1.4rem 0; }
.skel:last-child { border-bottom: 1px solid var(--border); }
.skel span {
  display: block;
  height: 1rem;
  width: 36%;
  border-radius: 2px;
  background: var(--border);
  animation: sk 1.5s ease-in-out infinite;
}
.skel:nth-child(2) span { width: 50%; animation-delay: .12s; }
.skel:nth-child(3) span { width: 26%; animation-delay: .24s; }
@keyframes sk { 0%,100%{opacity:.3} 50%{opacity:.7} }

/* === Social corner === */
.social-corner {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 150;
}

.social-corner a {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: var(--text);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.25s var(--ease);
}

.social-corner a:hover {
  border-color: #999;
  transform: translateY(-3px);
}

.social-corner svg {
  display: block;
  flex-shrink: 0;
}

/* === Reveal === */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 0.12s; }
.reveal-d2 { transition-delay: 0.22s; }
.reveal-d3 { transition-delay: 0.34s; }

/* === Responsive === */
@media (max-width: 600px) {
  #header { padding: 1rem 1.25rem; }
  .hero-inner { padding: 0 1.25rem; }
  #projects { padding: 5rem 1.25rem 4rem; }
  .social-corner { bottom: 1.25rem; right: 1.25rem; }
}