/* ============================================
   0xKAF — Portfolio Stylesheet
   Author  : Kasirun Sitorus
   GitHub  : github.com/AdanaTatuyaHatsumi
   ============================================ */

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

:root {
  --bg:      #0a0a0f;
  --surface: #111118;
  --border:  #1e1e2e;
  --accent:  #00e5c3;
  --accent2: #7c3aed;
  --text:    #e8e8f0;
  --muted:   #6b6b80;
  --card:    #13131c;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 14px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── NOISE OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
  opacity: 0.35;
}

/* ── CUSTOM CURSOR ── */
.cursor {
  width: 10px; height: 10px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transition: transform 0.15s ease;
  mix-blend-mode: screen;
}
.cursor-ring {
  width: 36px; height: 36px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  transition: all 0.25s ease;
  opacity: 0.5;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Syne', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 3rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 30%, transparent 100%);
}

.hero-glow {
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,229,195,0.08) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 900px;
}

.hero-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.3rem 0.8rem;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.6s 0.2s forwards;
}

.hero-name {
  font-family: 'Syne', sans-serif;
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.6s 0.4s forwards;
}

.hero-name span {
  display: block;
  color: transparent;
  -webkit-text-stroke: 1px var(--muted);
}

.hero-role {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.6s 0.6s forwards;
}
.hero-role em { color: var(--accent); font-style: normal; }

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s 0.8s forwards;
}

/* ── BUTTONS ── */
.btn {
  padding: 0.75rem 2rem;
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: #00ffda; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── SCROLL INDICATOR ── */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp 0.6s 1.2s forwards;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s infinite;
}

/* ── SECTIONS ── */
section {
  padding: 6rem 3rem;
  max-width: 1100px;
  margin: 0 auto;
}
.section-label {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 3rem;
}

/* ── DIVIDER ── */
.divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  max-width: 1100px;
  margin: 0 auto;
}

/* ── ABOUT ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.about-text p { color: var(--muted); line-height: 1.9; margin-bottom: 1.2rem; }
.about-text p strong { color: var(--text); }

.info-list { display: flex; flex-direction: column; gap: 1rem; }
.info-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
}
.info-key {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  min-width: 90px;
}
.info-val { color: var(--text); font-size: 13px; }
.info-val a { color: var(--accent); text-decoration: none; }
.info-val a:hover { text-decoration: underline; }

/* ── SKILLS ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
  cursor: default;
}
.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,229,195,0.04), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.skill-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.skill-card:hover::before { opacity: 1; }
.skill-icon { font-size: 1.8rem; margin-bottom: 1rem; }
.skill-name { font-family: 'Syne', sans-serif; font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.skill-desc { color: var(--muted); font-size: 12px; line-height: 1.7; }

/* ── TIMELINE ── */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0.5rem; bottom: 0;
  width: 1px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.5s;
}
.timeline-item.visible { opacity: 1; transform: translateX(0); }
.timeline-dot {
  position: absolute;
  left: -2.375rem; top: 0.35rem;
  width: 10px; height: 10px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
}
.timeline-date {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
}
.timeline-title { font-family: 'Syne', sans-serif; font-size: 1.2rem; font-weight: 700; margin-bottom: 0.3rem; }
.timeline-sub { color: var(--muted); font-size: 12px; margin-bottom: 0.75rem; }
.timeline-desc {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
  border-left: 2px solid var(--border);
  padding-left: 1rem;
}
.timeline-desc a { color: var(--accent); text-decoration: none; font-size: 12px; }
.timeline-desc a:hover { text-decoration: underline; }

/* ── LANGUAGES ── */
.lang-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.lang-card { background: var(--card); border: 1px solid var(--border); padding: 2rem; }
.lang-name { font-family: 'Syne', sans-serif; font-size: 1.1rem; font-weight: 700; margin-bottom: 0.75rem; }
.lang-bar-bg { height: 3px; background: var(--border); position: relative; overflow: hidden; }
.lang-bar {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  background: var(--accent);
  width: 0;
  transition: width 1.2s cubic-bezier(0.25, 1, 0.5, 1);
}
.lang-level { font-size: 11px; color: var(--muted); margin-top: 0.5rem; letter-spacing: 0.05em; }

/* ── SOCIALS ── */
.socials-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.social-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  font-size: 13px;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}
.social-link::after {
  content: '↗';
  position: absolute;
  right: 1rem; top: 50%;
  transform: translateY(-50%) translateX(10px);
  opacity: 0;
  transition: all 0.25s;
  color: var(--accent);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }
.social-link:hover::after { transform: translateY(-50%) translateX(0); opacity: 1; }
.social-icon { font-size: 1.2rem; display: flex; align-items: center; }

/* ── BADGE ── */
.badge {
  display: inline-block;
  background: rgba(0,229,195,0.08);
  border: 1px solid rgba(0,229,195,0.2);
  color: var(--accent);
  font-size: 11px;
  padding: 0.2rem 0.6rem;
  letter-spacing: 0.05em;
  margin: 0.25rem 0.25rem 0.25rem 0;
}

/* ── FOOTER ── */
footer {
  text-align: center;
  padding: 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}
footer span { color: var(--accent); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 1; }
}

/* ── REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s, transform 0.6s;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  section { padding: 4rem 1.5rem; }
  #hero { padding: 7rem 1.5rem 3rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .socials-grid { grid-template-columns: 1fr 1fr; }
  .lang-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
  .socials-grid { grid-template-columns: 1fr; }
}