/* ══════════════════════════════════════════════════
   VARIABLES & RESET
══════════════════════════════════════════════════ */
:root {
  --bg:        #0a0f1e;
  --bg2:       #0d1526;
  --bg3:       #111d35;
  --card:      rgba(10, 20, 40, 0.65);
  --blue:      #00b4ff;
  --cyan:      #00f5d4;
  --green:     #00ff88;
  --red:       #ff4d6d;
  --text:      #e8f0fe;
  --text2:     #94a3b8;
  --text3:     #64748b;
  --border:    rgba(0, 180, 255, 0.14);
  --border-h:  rgba(0, 180, 255, 0.45);
  --glow:      0 0 30px rgba(0, 180, 255, 0.18);
  --glow-c:    0 0 30px rgba(0, 245, 212, 0.18);
  --font-h:    'Space Grotesk', sans-serif;
  --font-b:    'Inter', sans-serif;
  --font-m:    'JetBrains Mono', monospace;
  --radius:    14px;
  --trans:     all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-b);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  opacity: 0;
  transition: opacity 0.45s ease;
}
body.loaded { opacity: 1; }

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ══════════════════════════════════════════════════
   UTILITIES
══════════════════════════════════════════════════ */
.gradient-text {
  background: linear-gradient(135deg, var(--blue) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-blue  { color: var(--blue); }
.text-cyan  { color: var(--cyan); }
.text-green { color: var(--green); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-grid {
  background-image:
    linear-gradient(rgba(0,180,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,180,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

.sec-label {
  font-family: var(--font-m);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.sec-title {
  font-family: var(--font-h);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 16px;
}

.sec-sub {
  color: var(--text2);
  max-width: 560px;
  margin-bottom: 56px;
  font-size: 16px;
}

.tag {
  display: inline-block;
  font-family: var(--font-m);
  font-size: 11px;
  padding: 3px 10px;
  background: rgba(0, 180, 255, 0.1);
  border: 1px solid rgba(0, 180, 255, 0.25);
  border-radius: 6px;
  color: var(--blue);
  letter-spacing: 0.04em;
}

/* FADE UP ANIMATION */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ══════════════════════════════════════════════════
   NAVBAR
══════════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: transform 0.32s ease, background 0.3s, box-shadow 0.3s, padding 0.3s;
}
.navbar.hidden { transform: translateY(-100%); }

.navbar.scrolled {
  background: rgba(10, 15, 30, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
  padding: 12px 0;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-family: var(--font-m);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.nav-logo .lb { color: var(--blue); }
.nav-logo span.logo-name,
.nav-logo { display: flex; align-items: center; gap: 1px; }

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text2);
  padding: 6px 12px;
  border-radius: 8px;
  transition: var(--trans);
}
.nav-link:hover, .nav-link.active {
  color: var(--blue);
  background: rgba(0, 180, 255, 0.08);
}

.btn-resume {
  font-family: var(--font-m);
  font-size: 13px;
  padding: 8px 18px;
  border: 1px solid var(--blue);
  border-radius: 8px;
  color: var(--blue);
  white-space: nowrap;
  transition: var(--trans);
}
.btn-resume:hover {
  background: rgba(0, 180, 255, 0.1);
  box-shadow: var(--glow);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--trans);
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: translateX(-8px); }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ══════════════════════════════════════════════════
   HERO
══════════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,180,255,0.07) 0%, transparent 65%),
              radial-gradient(ellipse 50% 40% at 80% 80%, rgba(0,245,212,0.05) 0%, transparent 50%),
              var(--bg);
}

#particleCanvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.hero-content {
  max-width: 720px;
}

/* Open to Work badge */
.open-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.28);
  color: var(--green);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
  letter-spacing: 0.03em;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 1.8s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,255,136,0.5); }
  50%       { box-shadow: 0 0 0 8px rgba(0,255,136,0); }
}

.hero-title {
  font-family: var(--font-h);
  font-size: clamp(34px, 5.5vw, 68px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: var(--text);
}

.accent-3am {
  font-family: var(--font-m);
  color: var(--blue);
  text-shadow: 0 0 24px rgba(0,180,255,0.5);
}

.hero-sub {
  font-size: clamp(17px, 2vw, 22px);
  color: var(--text2);
  margin-bottom: 20px;
  min-height: 36px;
}

.tw-text {
  color: var(--cyan);
  font-weight: 600;
}

.tw-cursor {
  color: var(--blue);
  font-weight: 300;
  animation: blink 1s step-end infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  color: var(--text3);
  font-size: 15px;
  margin-bottom: 36px;
  max-width: 580px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #0a0f1e;
  font-weight: 700;
  font-size: 15px;
  border-radius: 10px;
  transition: var(--trans);
  letter-spacing: 0.02em;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0,180,255,0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1px solid var(--border-h);
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  border-radius: 10px;
  background: rgba(0,180,255,0.05);
  transition: var(--trans);
}
.btn-secondary:hover {
  border-color: var(--blue);
  background: rgba(0,180,255,0.1);
  transform: translateY(-2px);
  box-shadow: var(--glow);
}

/* Hero stats */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
}

.stat {
  text-align: center;
}

.stat-num {
  font-family: var(--font-h);
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--text3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 4px;
}

.stat-sep {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text3);
  font-size: 12px;
  z-index: 1;
  animation: float 2.5s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(-6px); }
}

.scroll-mouse {
  width: 22px;
  height: 36px;
  border: 2px solid var(--border-h);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.scroll-wheel {
  width: 3px;
  height: 8px;
  background: var(--blue);
  border-radius: 2px;
  animation: scroll-anim 1.8s ease-in-out infinite;
}

@keyframes scroll-anim {
  0%   { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(12px); }
}

/* ══════════════════════════════════════════════════
   ABOUT
══════════════════════════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-top: 48px;
}

.about-p {
  color: var(--text2);
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 20px;
}

.about-p strong { color: var(--text); }
.about-p em { font-style: italic; }

.learning-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: rgba(0,245,212,0.07);
  border: 1px solid rgba(0,245,212,0.2);
  border-radius: 10px;
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 28px;
}
.learning-badge i { color: var(--cyan); }
.learning-badge strong { color: var(--cyan); }

.about-pills {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text2);
  font-size: 14px;
  transition: var(--trans);
}
.pill:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(0,180,255,0.07);
}

/* Terminal widget */
.terminal {
  background: #0b1120;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-m);
  font-size: 14px;
  box-shadow: var(--glow), 0 40px 80px rgba(0,0,0,0.4);
}

.term-bar {
  background: #131e34;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--border);
}
.tb-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: block;
}
.term-title {
  margin-left: 12px;
  font-size: 12px;
  color: var(--text3);
}

.term-body {
  padding: 20px 24px 24px;
  line-height: 1.9;
}

.t-row { display: flex; align-items: center; gap: 4px; }
.t-p   { color: var(--cyan); user-select: none; }
.t-c   { color: var(--text); }
.t-o   { color: var(--text3); padding-left: 16px; }
.t-k   { color: var(--text2); }
.t-v   { color: var(--cyan); }
.t-green { color: var(--green); padding-left: 16px; }

.t-cursor-blink {
  color: var(--blue);
  animation: blink 1s step-end infinite;
}

/* ══════════════════════════════════════════════════
   TECH STACK
══════════════════════════════════════════════════ */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.stack-cat {
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--trans);
}
.stack-cat:hover {
  border-color: rgba(0,180,255,0.3);
  box-shadow: var(--glow);
}

.cat-hd {
  font-family: var(--font-h);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 10px 10px;
  min-width: 64px;
  background: rgba(0, 20, 50, 0.5);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: default;
  transition: var(--trans);
  text-align: center;
}
.chip:hover {
  border-color: var(--blue);
  box-shadow: 0 0 18px rgba(0,180,255,0.2);
  transform: translateY(-3px);
}
.chip i   { font-size: 22px; line-height: 1; }
.chip span { font-size: 11px; color: var(--text2); white-space: nowrap; }

/* Tooltip */
.chip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.88);
  color: #fff;
  font-size: 12px;
  font-family: var(--font-b);
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 10;
}
.chip:hover::after { opacity: 1; }

/* ══════════════════════════════════════════════════
   PROJECTS
══════════════════════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 24px;
}

.proj-card {
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: var(--trans);
}
.proj-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,180,255,0.38);
  box-shadow: 0 24px 60px rgba(0,180,255,0.12);
}

.proj-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.proj-ico {
  width: 44px; height: 44px;
  background: rgba(0,180,255,0.12);
  border: 1px solid rgba(0,180,255,0.25);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--blue);
}

.proj-gh-link {
  font-size: 20px;
  color: var(--text3);
  transition: var(--trans);
}
.proj-gh-link:hover { color: var(--blue); transform: scale(1.1); }

.proj-title {
  font-family: var(--font-h);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.proj-problem {
  display: flex;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255,77,109,0.07);
  border: 1px solid rgba(255,77,109,0.18);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text2);
  line-height: 1.6;
}
.proj-problem i { color: #ff4d6d; flex-shrink: 0; margin-top: 2px; }

.proj-desc {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.75;
}
.proj-desc .proj-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed var(--accent);
  transition: border-color .2s;
}
.proj-desc .proj-link:hover {
  border-bottom-style: solid;
}

.proj-outcome {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 14px;
  background: rgba(0,245,212,0.07);
  border: 1px solid rgba(0,245,212,0.2);
  border-radius: 8px;
  font-size: 13px;
  color: var(--cyan);
}
.proj-outcome i { flex-shrink: 0; margin-top: 2px; }

.proj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 4px;
}

/* ══════════════════════════════════════════════════
   CERTIFICATIONS
══════════════════════════════════════════════════ */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.cert-card {
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: relative;
  transition: var(--trans);
}
.cert-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,180,255,0.35);
  box-shadow: var(--glow);
}

.cert-ico {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
}
.cert-aws { background: rgba(255,153,0,0.12); border: 1px solid rgba(255,153,0,0.25); color: #ff9900; }
.cert-ibm { background: rgba(0,112,255,0.1);  border: 1px solid rgba(0,112,255,0.25); color: #0070ff; }
.cert-gcp { background: rgba(66,133,244,0.1); border: 1px solid rgba(66,133,244,0.25); }

.cert-body { flex: 1; }
.cert-name {
  font-family: var(--font-h);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 5px;
}
.cert-org { font-size: 13px; color: var(--text3); }
.cert-yr  { font-size: 13px; color: var(--text3); }

.cert-badge {
  position: absolute;
  top: 16px; right: 16px;
  font-family: var(--font-m);
  font-size: 11px;
  padding: 3px 9px;
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.28);
  border-radius: 6px;
  color: var(--green);
}

/* ══════════════════════════════════════════════════
   TIMELINE
══════════════════════════════════════════════════ */
.timeline {
  position: relative;
  padding-left: 48px;
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 12px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--cyan), transparent);
  border-radius: 2px;
}

.tl-item {
  position: relative;
  padding-bottom: 48px;
}
.tl-item:last-child { padding-bottom: 0; }

.tl-dot {
  position: absolute;
  left: -42px;
  top: 20px;
  width: 16px; height: 16px;
  background: var(--bg);
  border: 2px solid var(--blue);
  border-radius: 50%;
  transition: var(--trans);
  z-index: 1;
}
.tl-current {
  background: var(--blue);
  box-shadow: 0 0 0 5px rgba(0,180,255,0.2);
}

.tl-card {
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: var(--trans);
}
.tl-card:hover {
  border-color: rgba(0,180,255,0.3);
  box-shadow: var(--glow);
}
.tl-item:hover .tl-dot { border-color: var(--cyan); }

.tl-date {
  font-family: var(--font-m);
  font-size: 12px;
  color: var(--cyan);
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

.tl-title {
  font-family: var(--font-h);
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.tl-org {
  font-size: 14px;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 14px;
}

.tl-list {
  padding-left: 18px;
  list-style: disc;
  color: var(--text2);
  font-size: 14px;
  line-height: 1.85;
  margin-bottom: 14px;
}
.tl-list li::marker { color: var(--blue); }

.tl-tags { display: flex; flex-wrap: wrap; gap: 7px; }

/* ══════════════════════════════════════════════════
   CONTACT
══════════════════════════════════════════════════ */
.contact-wrap {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 60px 0;
}

.contact-wrap .sec-label { margin-bottom: 12px; }
.contact-wrap .sec-title { font-size: clamp(26px, 4vw, 40px); margin-bottom: 16px; }

.contact-sub {
  color: var(--text2);
  margin-bottom: 48px;
  font-size: 16px;
}

.contact-cards {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.cc {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 28px 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 150px;
  transition: var(--trans);
  cursor: pointer;
}
.cc:hover {
  transform: translateY(-6px);
  border-color: rgba(0,180,255,0.45);
  box-shadow: 0 20px 50px rgba(0,180,255,0.15);
}

.cc-ico {
  width: 52px; height: 52px;
  background: rgba(0,180,255,0.1);
  border: 1px solid rgba(0,180,255,0.25);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--blue);
  transition: var(--trans);
}
.cc:hover .cc-ico {
  background: rgba(0,180,255,0.2);
  box-shadow: var(--glow);
}

.cc-label {
  font-family: var(--font-h);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.cc small {
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-m);
}

/* ══════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════ */
.footer {
  background: #070c18;
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.footer-tag {
  font-size: 13px;
  color: var(--text3);
  font-family: var(--font-m);
}
.footer-copy {
  font-size: 12px;
  color: var(--text3);
}

/* ══════════════════════════════════════════════════
   BACK TO TOP
══════════════════════════════════════════════════ */
.btt {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--blue);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: var(--trans);
}
.btt.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.btt:hover {
  background: rgba(0,180,255,0.15);
  border-color: var(--blue);
  box-shadow: var(--glow);
}

/* ══════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .projects-grid { grid-template-columns: 1fr; }
  .about-grid    { grid-template-columns: 1fr; gap: 40px; }

  /* Architecture diagram — horizontal scroll on small screens */
  .arch-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .arch-tag {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-right: 0;
    padding-bottom: 10px;
    margin-bottom: 4px;
    width: 100%;
  }
  .arch-flow {
    overflow-x: auto;
    width: 100%;
    padding-bottom: 6px;
  }
  .arch-flow::-webkit-scrollbar       { height: 3px; }
  .arch-flow::-webkit-scrollbar-track { background: transparent; }
  .arch-flow::-webkit-scrollbar-thumb { background: rgba(0,180,255,0.2); border-radius: 2px; }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .btn-resume { display: none; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(7,12,24,0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open {
    max-height: 400px;
    padding: 12px 0;
  }
  .nav-link {
    display: block;
    padding: 12px 24px;
    border-radius: 0;
  }

  .hero-btns { flex-direction: column; }
  .hero-stats { gap: 20px; }
  .stat-num   { font-size: 22px; }

  .section     { padding: 72px 0; }
  .stack-grid  { grid-template-columns: 1fr; }
  .certs-grid  { grid-template-columns: 1fr; }
  .contact-cards { flex-direction: column; align-items: center; }
  .cc          { width: 100%; max-width: 300px; flex-direction: row; justify-content: flex-start; padding: 18px 24px; }

  .timeline    { padding-left: 32px; }
  .tl-dot      { left: -28px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 28px; }
  .sec-title  { font-size: 24px; }
  .cert-card  { flex-direction: column; align-items: flex-start; }
  .cert-badge { position: static; margin-top: 8px; }
}

/* ══════════════════════════════════════════════════
   SCROLL PROGRESS BAR
══════════════════════════════════════════════════ */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  z-index: 2000;
  transition: width 0.08s linear;
  box-shadow: 0 0 8px rgba(0,180,255,0.5);
}

/* ══════════════════════════════════════════════════
   ARCHITECTURE DIAGRAM
══════════════════════════════════════════════════ */
.arch-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 48px;
}

.arch-row {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 24px;
  overflow-x: auto;
  transition: var(--trans);
}
.arch-row:hover {
  border-color: rgba(0,180,255,0.28);
  box-shadow: var(--glow);
}

.arch-tag {
  font-family: var(--font-m);
  font-size: 10px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  min-width: 88px;
  flex-shrink: 0;
  padding-right: 20px;
  border-right: 1px solid var(--border);
}

.arch-flow {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  min-width: 0;
}

.arch-node {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  background: rgba(0, 15, 40, 0.7);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-m);
  font-size: 12px;
  color: var(--text2);
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--trans);
}
.arch-node:hover {
  border-color: var(--blue);
  color: var(--blue);
  box-shadow: 0 0 14px rgba(0,180,255,0.18);
  transform: translateY(-2px);
}
.arch-node-primary {
  border-color: rgba(0,180,255,0.35);
  color: var(--blue);
  background: rgba(0,180,255,0.08);
}
.arch-node-accent {
  border-color: rgba(0,245,212,0.3);
  color: var(--cyan);
  background: rgba(0,245,212,0.07);
}

/* Animated flowing arrow */
.arch-arrow {
  position: relative;
  flex-shrink: 0;
  width: 40px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-arrow::before {
  content: '';
  position: absolute;
  top: 50%; left: 0;
  transform: translateY(-50%);
  width: 100%; height: 2px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--blue) 0, var(--blue) 4px,
    transparent 4px, transparent 9px
  );
  animation: dash-flow 0.55s linear infinite;
}

.arch-arrow::after {
  content: '';
  position: absolute;
  right: -1px;
  top: 50%; transform: translateY(-50%);
  border-left: 6px solid var(--blue);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  opacity: 0.85;
}

.arch-label-arrow {
  position: absolute;
  top: -16px;
  left: 50%; transform: translateX(-50%);
  font-family: var(--font-m);
  font-size: 9px;
  color: var(--text3);
  white-space: nowrap;
  letter-spacing: 0.05em;
}

@keyframes dash-flow {
  from { background-position: 0 0; }
  to   { background-position: 9px 0; }
}

/* ══════════════════════════════════════════════════
   AVAILABILITY WIDGET
══════════════════════════════════════════════════ */
.avail-widget {
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
  background: rgba(0, 255, 136, 0.06);
  border: 1px solid rgba(0, 255, 136, 0.22);
  border-radius: var(--radius);
  padding: 18px 24px;
  margin-bottom: 40px;
  text-align: left;
}

.avail-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--green);
  font-size: 15px;
}

.avail-dot-big {
  width: 10px; height: 10px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 1.8s ease-in-out infinite;
  flex-shrink: 0;
}

.avail-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text2);
}

.avail-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.avail-meta i { color: var(--text3); }

/* ══════════════════════════════════════════════════
   COPY HINT (contact)
══════════════════════════════════════════════════ */
.copy-hint {
  font-size: 11px;
  color: var(--text3);
  font-family: var(--font-m);
  transition: var(--trans);
}
.copy-hint.copied {
  color: var(--green);
}

/* ══════════════════════════════════════════════════
   SANDBOX TERMINAL
══════════════════════════════════════════════════ */
.sandbox-wrap {
  max-width: 920px;
  margin: 0 auto;
}

.sb-hints {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.sb-hint {
  font-family: var(--font-m);
  font-size: 12px;
  padding: 6px 14px;
  background: rgba(0, 180, 255, 0.07);
  border: 1px solid rgba(0, 180, 255, 0.2);
  border-radius: 6px;
  color: var(--blue);
  cursor: pointer;
  transition: var(--trans);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.sb-hint:hover {
  background: rgba(0, 180, 255, 0.15);
  border-color: var(--blue);
  transform: translateY(-1px);
}
.sb-hint-special {
  background: rgba(0, 255, 136, 0.07);
  border-color: rgba(0, 255, 136, 0.25);
  color: var(--green);
}
.sb-hint-special:hover {
  background: rgba(0, 255, 136, 0.14);
  border-color: var(--green);
}

kbd {
  font-family: var(--font-m);
  font-size: 12px;
  padding: 2px 6px;
  background: rgba(0, 180, 255, 0.1);
  border: 1px solid rgba(0, 180, 255, 0.25);
  border-radius: 4px;
  color: var(--blue);
}

.sandbox-term {
  background: #060d1b;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--glow), 0 40px 80px rgba(0, 0, 0, 0.55);
}

.sb-bar {
  background: #0b1628;
  padding: 11px 16px;
  display: flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--border);
}
.tb-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.sb-bar-title {
  margin-left: 10px;
  font-family: var(--font-m);
  font-size: 12px;
  color: var(--text2);
}
.sb-bar-right {
  margin-left: auto;
  font-family: var(--font-m);
  font-size: 11px;
  color: var(--text3);
}

.sb-output {
  height: 440px;
  overflow-y: auto;
  padding: 20px 24px 10px;
  font-family: var(--font-m);
  font-size: 13.5px;
  line-height: 1.75;
  cursor: text;
}

.sb-line {
  white-space: pre-wrap;
  word-break: break-word;
}

/* Terminal colour classes */
.sb-prompt-echo { color: var(--cyan); }
.sb-cmd-echo    { color: var(--text); }
.sb-blue        { color: var(--blue); }
.sb-cyan        { color: var(--cyan); }
.sb-green       { color: var(--green); }
.sb-yellow      { color: #ffd700; }
.sb-red         { color: #ff4d6d; }
.sb-dim         { color: var(--text3); }

.sb-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px 14px;
  border-top: 1px solid var(--border);
  background: #060d1b;
}

.sb-prompt-label {
  font-family: var(--font-m);
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
  flex-shrink: 0;
}

.sb-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-m);
  font-size: 13.5px;
  color: var(--text);
  caret-color: var(--blue);
}
.sb-input::placeholder { color: var(--text3); }

.sb-output::-webkit-scrollbar       { width: 4px; }
.sb-output::-webkit-scrollbar-track { background: transparent; }
.sb-output::-webkit-scrollbar-thumb { background: rgba(0,180,255,0.2); border-radius: 2px; }

/* ══════════════════════════════════════════════════
   SELECTION & SCROLLBAR
══════════════════════════════════════════════════ */
::selection {
  background: rgba(0,180,255,0.25);
  color: var(--text);
}

::-webkit-scrollbar        { width: 6px; }
::-webkit-scrollbar-track  { background: var(--bg); }
::-webkit-scrollbar-thumb  { background: rgba(0,180,255,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,180,255,0.5); }