/* ============================================================
   PORTFOLIO — style.css
   Brutalist Minimalism | Black & White | Dark + Light Theme
   ============================================================ */

/* ============================================================
   CSS VARIABLES — DARK (default)
   ============================================================ */
:root,
[data-theme="dark"] {
  --bg:           #000000;
  --bg-alt:       #111111;
  --bg-card:      #1a1a1a;
  --text:         #ffffff;
  --text-muted:   #888888;
  --text-dim:     #444444;
  --border:       #333333;
  --border-light: rgba(255,255,255,0.08);
  --shadow:       rgba(0,0,0,0.6);
  --accent:       #ffffff;

  /* Cert placeholder gradient */
  --cert-ph-a: #1a1a1a;
  --cert-ph-b: #2a2a2a;
}

/* ============================================================
   CSS VARIABLES — LIGHT
   ============================================================ */
[data-theme="light"] {
  --bg:           #f8f8f8;
  --bg-alt:       #efefef;
  --bg-card:      #e8e8e8;
  --text:         #0a0a0a;
  --text-muted:   #555555;
  --text-dim:     #aaaaaa;
  --border:       #d0d0d0;
  --border-light: rgba(0,0,0,0.08);
  --shadow:       rgba(0,0,0,0.12);
  --accent:       #0a0a0a;

  --cert-ph-a: #e0e0e0;
  --cert-ph-b: #d0d0d0;
}

/* ============================================================
   SHARED TOKENS
   ============================================================ */
:root {
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
  --section-pad:  120px;
  --container:    1200px;
  --ease:         cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out:     cubic-bezier(0.0, 0.0, 0.2, 1);
  --dur-fast:     0.2s;
  --dur-med:      0.4s;
  --dur-slow:     0.7s;
}

/* ============================================================
   RESET
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  cursor: none;
  overflow-x: hidden;
  transition: background-color var(--dur-med) var(--ease),
              color var(--dur-med) var(--ease);
}
@media (hover: none) { body { cursor: auto; } }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
::selection { background: var(--text); color: var(--bg); }
:focus-visible { outline: 2px solid var(--text); outline-offset: 4px; }
.mono { font-family: var(--font-mono); font-weight: 400; letter-spacing: -0.01em; }

/* ============================================================
   SCROLL PROGRESS
   ============================================================ */
#scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px;
  background: var(--text); width: 0%; z-index: 9999;
  transition: width 0.1s linear;
}

/* ============================================================
   CUSTOM CURSOR
   ============================================================ */
#cursor {
  position: fixed; width: 8px; height: 8px;
  background: var(--text); border-radius: 50%;
  pointer-events: none; z-index: 9998;
  transform: translate(-50%, -50%);
  transition: width var(--dur-fast), height var(--dur-fast), background var(--dur-fast);
}
#cursor-follower {
  position: fixed; width: 32px; height: 32px;
  border: 1px solid rgba(128,128,128,0.5); border-radius: 50%;
  pointer-events: none; z-index: 9997;
  transform: translate(-50%, -50%);
  transition: transform 0.12s var(--ease), opacity var(--dur-fast);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container { max-width: var(--container); margin: 0 auto; padding: 0 48px; }
section { padding: var(--section-pad) 0; position: relative; }
#about    { background: var(--bg); }
#skills   { background: var(--bg-alt); }
#projects { background: var(--bg); }
#experience  { background: var(--bg-alt); }
#certificates { background: var(--bg); }
#contact  { background: var(--bg-alt); }

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-header { display: flex; align-items: center; gap: 16px; margin-bottom: 72px; }
.section-num { color: var(--text-muted); font-size: 0.85rem; flex-shrink: 0; }
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700; line-height: 1; letter-spacing: -0.04em; flex-shrink: 0;
}
.section-line { flex: 1; height: 1px; background: var(--border); max-width: 400px; }

/* ============================================================
   NAVBAR
   ============================================================ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 20px 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background var(--dur-med), padding var(--dur-med), border-color var(--dur-med), box-shadow var(--dur-med);
}
#navbar.scrolled {
  padding: 14px 0;
  box-shadow: 0 4px 24px var(--shadow);
  border-color: var(--border);
}
.nav-container {
  max-width: var(--container); margin: 0 auto; padding: 0 48px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 800;
  letter-spacing: -0.02em; transition: opacity var(--dur-fast);
}
.nav-logo:hover { opacity: 0.6; }
.logo-bracket { color: var(--text-muted); font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: 36px; }
.nav-link {
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted);
  letter-spacing: 0.08em; text-transform: uppercase; transition: color var(--dur-fast);
  position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--text); transform: scaleX(0);
  transition: transform var(--dur-fast) var(--ease); transform-origin: right;
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-actions { display: flex; align-items: center; gap: 12px; }

/* ============================================================
   THEME TOGGLE
   ============================================================ */
.theme-toggle {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); color: var(--text-muted);
  transition: color var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
  border-radius: 0;
  position: relative; overflow: hidden;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text); }
.theme-toggle svg { width: 16px; height: 16px; position: absolute; transition: opacity var(--dur-med), transform var(--dur-med) var(--ease); }

/* Dark mode: show moon, hide sun */
[data-theme="dark"]  .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="dark"]  .icon-sun  { opacity: 0; transform: rotate(90deg) scale(0.5); }
/* Light mode: show sun, hide moon */
[data-theme="light"] .icon-sun  { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="light"] .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.5); }

/* ============================================================
   HAMBURGER
   ============================================================ */
.hamburger { display: none; flex-direction: column; gap: 5px; width: 28px; padding: 4px; }
.hamburger span {
  display: block; height: 1.5px; background: var(--text);
  transition: transform var(--dur-med) var(--ease), opacity var(--dur-fast);
  transform-origin: center;
}
.hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
#hero {
  min-height: 100svh; display: flex; align-items: center;
  justify-content: center; position: relative;
  padding: 120px 0 80px; overflow: hidden;
}
.hero-bg-grid {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, color-mix(in srgb, var(--text) 8%, transparent) 1px, transparent 1px);
  background-size: 40px 40px; pointer-events: none;
}
.hero-content { position: relative; z-index: 2; max-width: 900px; padding: 0 48px; }
.hero-pre { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 28px; opacity: 0; animation: fadeSlideUp 0.6s var(--ease-out) 0.2s forwards; }
.hero-name {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.4rem, 9vw, 8rem); line-height: 0.95;
  letter-spacing: -0.04em; margin-bottom: 32px; display: flex; flex-direction: column;
  word-break: break-word; overflow-wrap: break-word;
}
.name-line { display: block; opacity: 0; animation: fadeSlideUp 0.7s var(--ease-out) 0.4s forwards; }
.accent-line { animation-delay: 0.55s; }
.hero-tagline {
  font-family: var(--font-mono); font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-muted); margin-bottom: 24px;
  opacity: 0; animation: fadeSlideUp 0.6s var(--ease-out) 0.8s forwards;
  display: flex; align-items: center; gap: 12px;
}
.tagline-prefix { color: var(--text-dim); }
.cursor-blink { animation: blink 1s step-end infinite; color: var(--text); }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.1rem); color: var(--text-muted); line-height: 1.8;
  max-width: 520px; margin-bottom: 48px;
  opacity: 0; animation: fadeSlideUp 0.6s var(--ease-out) 1s forwards;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; opacity: 0; animation: fadeSlideUp 0.6s var(--ease-out) 1.1s forwards; }
.hero-scroll-hint {
  position: absolute; bottom: 40px; left: 48px;
  display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
  opacity: 0; animation: fadeIn 0.6s var(--ease-out) 1.5s forwards;
}
.hero-scroll-hint .mono { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.12em; writing-mode: vertical-lr; transform: rotate(180deg); }
.scroll-line { width: 1px; height: 48px; background: linear-gradient(to bottom, var(--text-dim), transparent); animation: pulse-line 2s ease-in-out infinite; }
@keyframes pulse-line { 0%,100%{opacity:1} 50%{opacity:0.3} }
.hero-deco { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.deco-box { position: absolute; border: 1px solid color-mix(in srgb, var(--text) 6%, transparent); animation: float 8s ease-in-out infinite; }
.deco-1 { width: 80px; height: 80px; top: 20%; right: 15%; animation-delay: 0s; }
.deco-2 { width: 40px; height: 40px; top: 60%; right: 25%; animation-delay: 3s; }
.deco-circle { position: absolute; width: 300px; height: 300px; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--text) 4%, transparent); bottom: -100px; right: -60px; }
@keyframes float { 0%,100%{transform:translateY(0) rotate(0)} 50%{transform:translateY(-12px) rotate(3deg)} }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 14px 32px; border: 1px solid transparent;
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast), transform var(--dur-fast);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--text); color: var(--bg); border-color: var(--text); }
.btn-primary:hover { opacity: 0.85; }
.btn-outline { background: transparent; color: var(--text); border-color: var(--text-dim); }
.btn-outline:hover { border-color: var(--text); }

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid { display: grid; grid-template-columns: 1fr 380px; gap: 80px; align-items: start; }
.about-lead { font-family: var(--font-display); font-size: clamp(1.3rem, 2.5vw, 1.6rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.4; margin-bottom: 28px; }
.about-body { font-size: 1.05rem; color: var(--text-muted); margin-bottom: 20px; line-height: 1.8; }
.about-body strong { color: var(--text); font-weight: 500; }
.about-stats { display: flex; gap: 48px; margin-top: 48px; padding-top: 40px; border-top: 1px solid var(--border); }
.stat-item { display: flex; flex-direction: column; gap: 4px; }
.stat-num { font-family: var(--font-display); font-size: 2.5rem; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.stat-label { font-size: 0.78rem; color: var(--text-muted); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; }
.about-card { border: 1px solid var(--border); padding: 28px; margin-bottom: 20px; transition: border-color var(--dur-fast); }
.about-card:last-child { margin-bottom: 0; }
.about-card:hover { border-color: var(--text-muted); }
.card-title { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 20px; }
.stack-list { display: flex; flex-direction: column; gap: 12px; }
.stack-item { display: flex; align-items: center; gap: 12px; font-size: 0.95rem; color: var(--text-muted); transition: color var(--dur-fast); }
.stack-item:hover { color: var(--text); }
.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--text-dim); flex-shrink: 0; }
.focus-text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.7; }

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; border: 1px solid var(--border); }
.skill-category { padding: 44px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); transition: background var(--dur-fast); }
.skill-category:nth-child(even) { border-right: none; }
.skill-category:nth-child(3), .skill-category:nth-child(4) { border-bottom: none; }
.skill-category:hover { background: var(--bg-card); }
.cat-title { display: flex; align-items: center; gap: 12px; font-family: var(--font-display); font-size: 1.1rem; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 28px; }
.cat-icon { width: 20px; height: 20px; color: var(--text-muted); }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag { font-family: var(--font-mono); font-size: 0.78rem; padding: 6px 14px; border: 1px solid var(--border); color: var(--text-muted); letter-spacing: 0.03em; transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast); }
.skill-tag:hover { border-color: var(--text); color: var(--text); background: color-mix(in srgb, var(--text) 4%, transparent); }

/* ============================================================
   PROJECTS
   ============================================================ */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 48px; }
.filter-btn { font-family: var(--font-mono); font-size: 0.75rem; padding: 8px 18px; border: 1px solid var(--border); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; transition: all var(--dur-fast); }
.filter-btn:hover, .filter-btn.active { background: var(--text); color: var(--bg); border-color: var(--text); }
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; }
.project-card { border: 1px solid var(--border); position: relative; transition: background var(--dur-med) var(--ease), transform var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); overflow: hidden; }
.project-card:hover { background: var(--bg-card); transform: translateY(-4px); box-shadow: 0 20px 60px var(--shadow); border-color: var(--text-muted); z-index: 2; }
.project-card.hidden { display: none; }
.project-body { padding: 28px 32px 32px; }

/* ── Project image slideshow ── */
.proj-slides {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}
/* All images stacked, fade between them */
.proj-slides .ps-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
  filter: grayscale(20%);
}
.proj-slides .ps-img.active { opacity: 1; }
.project-card:hover .proj-slides .ps-img.active { filter: grayscale(0%); }

/* Prev / Next arrow overlays */
.ps-prev, .ps-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px; z-index: 10;
  background: rgba(0,0,0,0.55); border: 1px solid rgba(255,255,255,0.15);
  color: #fff; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--dur-fast), background var(--dur-fast);
  cursor: pointer;
}
.ps-prev { left: 10px; }
.ps-next { right: 10px; }
.ps-prev svg, .ps-next svg { width: 16px; height: 16px; pointer-events: none; }
.proj-slides:hover .ps-prev,
.proj-slides:hover .ps-next { opacity: 1; }
.ps-prev:hover, .ps-next:hover { background: rgba(0,0,0,0.85); }
/* Hide arrows when only 1 image */
.proj-slides.single .ps-prev,
.proj-slides.single .ps-next { display: none; }

/* Dot indicators */
.ps-dots {
  position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 5px; z-index: 10;
}
.ps-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: rgba(255,255,255,0.35); border: none; padding: 0; cursor: pointer;
  transition: background var(--dur-fast), transform var(--dur-fast);
}
.ps-dot.active { background: #fff; transform: scale(1.3); }
/* Hide dots when only 1 image */
.proj-slides.single .ps-dots { display: none; }

/* Counter badge top-right */
.ps-counter {
  position: absolute; top: 8px; right: 10px; z-index: 10;
  font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.05em;
  color: rgba(255,255,255,0.6);
  background: rgba(0,0,0,0.45);
  padding: 2px 7px;
  pointer-events: none;
}
.proj-slides.single .ps-counter { display: none; }

.project-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 24px; }
.project-icon { width: 44px; height: 44px; border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--text-muted); transition: border-color var(--dur-fast), color var(--dur-fast); }
.project-card:hover .project-icon { border-color: var(--text); color: var(--text); }
.project-icon svg { width: 20px; height: 20px; }
.project-links { display: flex; gap: 12px; opacity: 0; transform: translateY(-4px); transition: opacity var(--dur-fast), transform var(--dur-fast); }
.project-card:hover .project-links { opacity: 1; transform: translateY(0); }
.icon-link { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); transition: color var(--dur-fast); }
.icon-link:hover { color: var(--text); }
.icon-link svg { width: 18px; height: 18px; }
.project-title { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.3; margin-bottom: 16px; }
.project-desc { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 28px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); padding: 4px 10px; border: 1px solid var(--border); letter-spacing: 0.03em; transition: color var(--dur-fast), border-color var(--dur-fast); }
.project-card:hover .tag { color: var(--text-muted); border-color: var(--text-dim); }

/* ============================================================
   EXPERIENCE / TIMELINE
   ============================================================ */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px; background: var(--border); }
.timeline-item { position: relative; margin-bottom: 64px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker { position: absolute; left: -30px; top: 8px; width: 12px; height: 12px; border: 2px solid var(--text-dim); border-radius: 50%; background: var(--bg-alt); transition: border-color var(--dur-fast), background var(--dur-fast); }
.timeline-item:hover .timeline-marker { border-color: var(--text); background: var(--text); }
.timeline-content { padding: 32px 36px; border: 1px solid var(--border); transition: border-color var(--dur-fast), background var(--dur-fast); }
.timeline-item:hover .timeline-content { background: var(--bg-card); border-color: var(--text-muted); }
.timeline-meta { display: flex; align-items: center; gap: 16px; margin-bottom: 12px; }
.timeline-date { font-size: 0.78rem; color: var(--text-dim); }
.timeline-type { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); padding: 3px 10px; border: 1px solid var(--border); text-transform: uppercase; letter-spacing: 0.08em; }
.timeline-title { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 4px; }
.timeline-company { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 20px; }
.timeline-list { list-style: none; margin-bottom: 24px; display: flex; flex-direction: column; gap: 10px; }
.timeline-list li { font-size: 0.92rem; color: var(--text-muted); padding-left: 16px; position: relative; line-height: 1.6; }
.timeline-list li::before { content: '—'; position: absolute; left: 0; color: var(--text-dim); }
.timeline-tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* ============================================================
   CERTIFICATES SLIDER
   ============================================================ */
.cert-intro {
  font-size: 0.8rem; color: var(--text-dim); margin-bottom: 40px;
  margin-top: -40px;
}
.cert-intro code {
  font-family: var(--font-mono); color: var(--text-muted);
  background: var(--bg-card); padding: 2px 6px;
}

.cert-slider-wrap {
  display: flex; align-items: center; gap: 20px; position: relative;
}

.cert-viewport {
  flex: 1; overflow: hidden; cursor: grab; user-select: none;
}
.cert-viewport:active { cursor: grabbing; }

.cert-track {
  display: flex; gap: 24px;
  transition: transform 0.5s var(--ease);
  will-change: transform;
}

.cert-slide {
  flex: 0 0 calc(33.333% - 16px);
  min-width: 0;
  border: 1px solid var(--border);
  transition: border-color var(--dur-fast), transform var(--dur-med) var(--ease);
  overflow: hidden;
}
.cert-slide:hover { border-color: var(--text-muted); transform: translateY(-4px); }

.cert-img-wrap {
  width: 100%; aspect-ratio: 4/3; overflow: hidden;
  background: var(--bg-card);
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.cert-img-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--dur-slow) var(--ease), filter var(--dur-med);
  filter: grayscale(20%);
}
.cert-slide:hover .cert-img-wrap img {
  transform: scale(1.04);
  filter: grayscale(0%);
}

/* Placeholder SVG styling */
.cert-img-wrap img[src$=".svg"] { object-fit: contain; padding: 24px; }

.cert-info {
  padding: 20px 24px 24px;
  display: flex; flex-direction: column; gap: 6px;
  border-top: 1px solid var(--border);
}
.cert-issuer { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; }
.cert-name { font-family: var(--font-display); font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.3; }
.cert-date { font-size: 0.72rem; color: var(--text-dim); }
.cert-link {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 12px;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.cert-link svg { width: 11px; height: 11px; flex-shrink: 0; transition: transform var(--dur-fast); }
.cert-link:hover { color: var(--text); border-color: var(--text); }
.cert-link:hover svg { transform: translate(2px, -2px); }

/* Arrow buttons */
.cert-arrow {
  width: 44px; height: 44px; flex-shrink: 0;
  border: 1px solid var(--border); color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
  align-self: center;
}
.cert-arrow:hover { background: var(--text); color: var(--bg); border-color: var(--text); }
.cert-arrow:disabled { opacity: 0.25; pointer-events: none; }
.cert-arrow svg { width: 20px; height: 20px; }

/* Dots */
.cert-dots {
  display: flex; justify-content: center; gap: 8px; margin-top: 32px;
}
.cert-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--border); border: none; padding: 0;
  transition: background var(--dur-fast), transform var(--dur-fast);
  cursor: pointer;
}
.cert-dot.active { background: var(--text); transform: scale(1.4); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.contact-heading { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3.2rem); font-weight: 800; letter-spacing: -0.05em; line-height: 1.1; margin-bottom: 20px; }
.contact-accent { color: var(--text-muted); }
.contact-sub { font-size: 1rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 48px; }
.contact-links { display: flex; flex-direction: column; gap: 16px; }
.contact-link { display: flex; align-items: center; gap: 14px; font-size: 0.92rem; color: var(--text-muted); padding: 16px 0; border-bottom: 1px solid var(--border); transition: color var(--dur-fast), border-color var(--dur-fast); }
.contact-link:last-child { border-bottom: none; }
.contact-link svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--text-dim); transition: color var(--dur-fast); }
.contact-link:hover { color: var(--text); }
.contact-link:hover svg { color: var(--text); }
.contact-form { display: flex; flex-direction: column; gap: 24px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-label { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; }
.form-input { background: transparent; border: 1px solid var(--border); color: var(--text); font-family: var(--font-body); font-size: 0.95rem; padding: 14px 18px; transition: border-color var(--dur-fast); outline: none; width: 100%; appearance: none; -webkit-appearance: none; }
.form-input::placeholder { color: var(--text-dim); }
.form-input:focus { border-color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 140px; font-family: var(--font-body); }
.form-submit { align-self: flex-start; }
.form-submit svg { width: 14px; height: 14px; }
.form-note { font-size: 0.8rem; color: var(--text-muted); min-height: 1.2em; }

/* ============================================================
   FOOTER
   ============================================================ */
#footer { background: var(--bg-alt); padding: 60px 0 40px; border-top: 1px solid var(--border); }
.footer-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; }
.footer-logo { font-family: var(--font-display); font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; transition: opacity var(--dur-fast); }
.footer-logo:hover { opacity: 0.6; }
.footer-tagline { font-size: 0.78rem; color: var(--text-dim); }
.footer-divider { height: 1px; background: var(--border); margin-bottom: 32px; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-copy { font-size: 0.82rem; color: var(--text-dim); }
.footer-copy strong { color: var(--text-muted); font-weight: 500; }

/* ============================================================
   BACK TO TOP
   ============================================================ */
#back-to-top {
  position: fixed; bottom: 32px; right: 32px; width: 44px; height: 44px;
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text);
  display: flex; align-items: center; justify-content: center; z-index: 100;
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: opacity var(--dur-fast), transform var(--dur-fast), background var(--dur-fast), border-color var(--dur-fast);
}
#back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
#back-to-top:hover { background: var(--text); color: var(--bg); border-color: var(--text); }
#back-to-top svg { width: 18px; height: 18px; }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.skill-category.reveal:nth-child(1) { transition-delay: 0s; }
.skill-category.reveal:nth-child(2) { transition-delay: 0.1s; }
.skill-category.reveal:nth-child(3) { transition-delay: 0.2s; }
.skill-category.reveal:nth-child(4) { transition-delay: 0.3s; }
.project-card.reveal:nth-child(1) { transition-delay: 0s; }
.project-card.reveal:nth-child(2) { transition-delay: 0.1s; }
.project-card.reveal:nth-child(3) { transition-delay: 0.2s; }
.project-card.reveal:nth-child(4) { transition-delay: 0.3s; }

/* ============================================================
   KEYFRAMES
   ============================================================ */
@keyframes fadeSlideUp { from{opacity:0;transform:translateY(24px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn      { from{opacity:0} to{opacity:1} }

/* ============================================================
   RESPONSIVE — TABLET
   ============================================================ */
@media (max-width: 1024px) {
  .container, .nav-container { padding: 0 32px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 60px; }
  .cert-slide { flex: 0 0 calc(50% - 12px); }
}

/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */
@media (max-width: 768px) {
  :root { --section-pad: 80px; }
  .container, .nav-container { padding: 0 24px; }
  #cursor, #cursor-follower { display: none; }
  body { cursor: auto; }

  .nav-links {
    position: fixed; inset: 0; background: var(--bg);
    flex-direction: column; align-items: center; justify-content: center;
    gap: 32px; opacity: 0; pointer-events: none;
    transition: opacity var(--dur-med) var(--ease); z-index: 999;
  }
  .nav-links.open { opacity: 1; pointer-events: auto; }
  .nav-link { font-size: 1rem; letter-spacing: 0.15em; }
  .hamburger { display: flex; z-index: 1001; }

  .hero-content { padding: 0 20px; }
  .hero-name { font-size: clamp(2rem, 11vw, 5rem); letter-spacing: -0.03em; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .hero-scroll-hint { left: 20px; }

  .about-stats { gap: 32px; flex-wrap: wrap; }

  .skills-grid { grid-template-columns: 1fr; border: none; gap: 2px; }
  .skill-category { padding: 32px 24px; border: 1px solid var(--border) !important; }

  .timeline { padding-left: 24px; }
  .timeline-content { padding: 24px; }
  .timeline-marker { left: -22px; }

  /* Cert slider: 1 up on mobile */
  .cert-slide { flex: 0 0 100%; }
  .cert-arrow { display: flex; }

  .footer-top { flex-direction: column; align-items: flex-start; gap: 12px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
  #back-to-top { bottom: 20px; right: 20px; }
}

@media (max-width: 480px) {
  .filter-bar { gap: 6px; }
  .filter-btn { padding: 7px 14px; font-size: 0.7rem; }
  .project-card { padding: 28px 24px; }
  .btn { padding: 12px 24px; font-size: 0.78rem; }
  .cert-slider-wrap { gap: 10px; }
  .cert-arrow { width: 36px; height: 36px; }
}