/* ═══════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul { list-style: none; }

/* ═══════════════════════════════════════
   M3 COLOR SYSTEM
   --h: hue angle (0–360)
   --c: chroma scale (0%–100%)
═══════════════════════════════════════ */
:root {
  --h: 212;
  --c: 100%;

  /* LIGHT MODE TOKENS */
  --primary:              hsl(var(--h), calc(var(--c) * 0.60), 34%);
  --on-primary:           hsl(var(--h), 20%, 99%);
  --primary-container:    hsl(var(--h), calc(var(--c) * 0.72), 91%);
  --on-primary-container: hsl(var(--h), calc(var(--c) * 0.55), 11%);

  --secondary:              hsl(calc(var(--h) + 35), calc(var(--c) * 0.26), 38%);
  --on-secondary:           hsl(0, 0%, 100%);
  --secondary-container:    hsl(calc(var(--h) + 35), calc(var(--c) * 0.30), 88%);
  --on-secondary-container: hsl(calc(var(--h) + 35), calc(var(--c) * 0.26), 11%);

  --tertiary:              hsl(calc(var(--h) + 70), calc(var(--c) * 0.32), 38%);
  --on-tertiary:           hsl(0, 0%, 100%);
  --tertiary-container:    hsl(calc(var(--h) + 70), calc(var(--c) * 0.36), 88%);
  --on-tertiary-container: hsl(calc(var(--h) + 70), calc(var(--c) * 0.32), 11%);

  --surface:          hsl(var(--h), calc(var(--c) * 0.09), 99%);
  --surface-variant:  hsl(var(--h), calc(var(--c) * 0.16), 89%);
  --on-surface:       hsl(var(--h), calc(var(--c) * 0.06), 10%);
  --on-surface-var:   hsl(var(--h), calc(var(--c) * 0.06), 30%);

  --bg:               hsl(var(--h), calc(var(--c) * 0.08), 98%);
  --on-bg:            hsl(var(--h), calc(var(--c) * 0.06), 10%);

  --cnt-lowest:  hsl(var(--h), calc(var(--c) * 0.08), 100%);
  --cnt-low:     hsl(var(--h), calc(var(--c) * 0.10), 96%);
  --cnt:         hsl(var(--h), calc(var(--c) * 0.12), 94%);
  --cnt-high:    hsl(var(--h), calc(var(--c) * 0.14), 90%);
  --cnt-highest: hsl(var(--h), calc(var(--c) * 0.16), 87%);

  --outline:     hsl(var(--h), calc(var(--c) * 0.07), 47%);
  --outline-var: hsl(var(--h), calc(var(--c) * 0.13), 79%);

  --shadow: 0 0 0 0 transparent;
  --shadow-sm: 0 2px 8px hsl(var(--h), 30%, 20%, 0.10);
  --shadow-md: 0 4px 20px hsl(var(--h), 30%, 20%, 0.14);
  --shadow-lg: 0 12px 40px hsl(var(--h), 30%, 20%, 0.18);

  /* EASING */
  --spring:       cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-soft:  cubic-bezier(0.22, 1.1, 0.36, 1);
  --standard:     cubic-bezier(0.2, 0, 0, 1);
  --decelerate:   cubic-bezier(0, 0, 0, 1);
  --accelerate:   cubic-bezier(0.3, 0, 1, 1);

  /* DURATION */
  --dt1: 200ms; --dt2: 300ms; --dt3: 450ms; --dt4: 550ms;

  /* LAYOUT */
  --rail-w: 80px;
  --bnav-h: 72px;
  --tbar-h: 0px;
}

/* ═══════════════════════════════════════
   DARK MODE
═══════════════════════════════════════ */
[data-mode="dark"] {
  --primary:              hsl(var(--h), calc(var(--c) * 0.65), 76%);
  --on-primary:           hsl(var(--h), calc(var(--c) * 0.50), 16%);
  --primary-container:    hsl(var(--h), calc(var(--c) * 0.48), 26%);
  --on-primary-container: hsl(var(--h), calc(var(--c) * 0.65), 91%);

  --secondary:              hsl(calc(var(--h) + 35), calc(var(--c) * 0.24), 71%);
  --on-secondary:           hsl(calc(var(--h) + 35), calc(var(--c) * 0.24), 18%);
  --secondary-container:    hsl(calc(var(--h) + 35), calc(var(--c) * 0.21), 28%);
  --on-secondary-container: hsl(calc(var(--h) + 35), calc(var(--c) * 0.24), 89%);

  --tertiary:              hsl(calc(var(--h) + 70), calc(var(--c) * 0.28), 72%);
  --on-tertiary:           hsl(calc(var(--h) + 70), calc(var(--c) * 0.28), 18%);
  --tertiary-container:    hsl(calc(var(--h) + 70), calc(var(--c) * 0.25), 28%);
  --on-tertiary-container: hsl(calc(var(--h) + 70), calc(var(--c) * 0.28), 89%);

  --surface:         hsl(var(--h), calc(var(--c) * 0.07), 7%);
  --surface-variant: hsl(var(--h), calc(var(--c) * 0.10), 20%);
  --on-surface:      hsl(var(--h), calc(var(--c) * 0.04), 93%);
  --on-surface-var:  hsl(var(--h), calc(var(--c) * 0.04), 70%);

  --bg:    hsl(var(--h), calc(var(--c) * 0.07), 6%);
  --on-bg: hsl(var(--h), calc(var(--c) * 0.04), 93%);

  --cnt-lowest:  hsl(var(--h), calc(var(--c) * 0.07), 4%);
  --cnt-low:     hsl(var(--h), calc(var(--c) * 0.07), 10%);
  --cnt:         hsl(var(--h), calc(var(--c) * 0.08), 14%);
  --cnt-high:    hsl(var(--h), calc(var(--c) * 0.09), 18%);
  --cnt-highest: hsl(var(--h), calc(var(--c) * 0.10), 22%);

  --outline:     hsl(var(--h), calc(var(--c) * 0.06), 46%);
  --outline-var: hsl(var(--h), calc(var(--c) * 0.09), 29%);

  --shadow-sm: 0 2px 8px hsl(0, 0%, 0%, 0.30);
  --shadow-md: 0 4px 20px hsl(0, 0%, 0%, 0.40);
  --shadow-lg: 0 12px 40px hsl(0, 0%, 0%, 0.50);
}

/* ═══════════════════════════════════════
   GLOBAL TRANSITIONS FOR THEME SWITCH
═══════════════════════════════════════ */
html {
  transition:
    background-color var(--dt2) var(--standard),
    color var(--dt2) var(--standard);
}
body, .nav-rail, .top-app-bar, .bottom-nav,
.card, .chip, .btn, .tag, .fab {
  transition:
    background-color var(--dt2) var(--standard),
    color var(--dt2) var(--standard),
    border-color var(--dt2) var(--standard),
    box-shadow var(--dt2) var(--standard);
}

/* ═══════════════════════════════════════
   TYPOGRAPHY
═══════════════════════════════════════ */
body {
  font-family: 'DM Sans', sans-serif;
  background-color: var(--bg);
  color: var(--on-bg);
  line-height: 1.5;
  overflow-x: hidden;
}
.font-display { font-family: 'Nunito', sans-serif; }
.material-symbols-rounded {
  font-family: 'Material Symbols Rounded';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  user-select: none;
}

/* ═══════════════════════════════════════
   MATERIAL SYMBOLS ICON BUTTON UTIL
═══════════════════════════════════════ */
.icon-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  transition:
    transform var(--dt2) var(--spring),
    background-color var(--dt1) var(--standard);
}
.icon-btn:active { transform: scale(0.88) !important; }

/* ═══════════════════════════════════════
   LAYOUT FOUNDATION
═══════════════════════════════════════ */
.nav-rail {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: var(--rail-w);
  background-color: var(--cnt-low);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 0 16px;
  z-index: 300;
  gap: 2px;
  border-right: 1px solid var(--outline-var);
}

main {
  margin-left: var(--rail-w);
  min-height: 100vh;
}

/* ═══════════════════════════════════════
   NAV RAIL CONTENT
═══════════════════════════════════════ */
.nav-brand {
  width: 48px; height: 48px;
  background-color: var(--primary);
  color: var(--on-primary);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Nunito', sans-serif;
  font-weight: 900; font-size: 1rem;
  border-radius: 18px 18px 18px 4px;
  margin-bottom: 12px;
  flex-shrink: 0;
  transition: transform var(--dt2) var(--spring), background-color var(--dt2) var(--standard);
}
.nav-brand:hover { transform: rotate(-5deg) scale(1.08); }

.nav-items-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 100%;
  padding: 0 8px;
}

.nav-item {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 4px;
  width: 100%;
  padding: 4px 0 6px;
  border-radius: var(--rail-w);
  color: var(--on-surface-var);
  text-decoration: none;
  position: relative;
  cursor: pointer;
}
.nav-item:hover { color: var(--on-surface); }

.nav-pill {
  width: 56px; height: 32px;
  border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  transition:
    background-color var(--dt2) var(--standard),
    width var(--dt2) var(--spring);
}
.nav-item.active .nav-pill { background-color: var(--secondary-container); }
.nav-item.active { color: var(--on-secondary-container); }
.nav-item.active .material-symbols-rounded { color: var(--on-secondary-container); }
.nav-item:not(.active):hover .nav-pill { background-color: var(--cnt-high); }

.nav-pill .material-symbols-rounded { font-size: 22px; }
.nav-label-text {
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: center;
  font-family: 'DM Sans', sans-serif;
}

.nav-divider {
  width: 40px; height: 1px;
  background-color: var(--outline-var);
  margin: 6px 0;
  flex-shrink: 0;
}

.nav-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  width: 100%;
}

.ctrl-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  transition:
    transform var(--dt2) var(--spring),
    background-color var(--dt1) var(--standard);
}
.ctrl-btn.theme-ctrl {
  background-color: var(--primary-container);
  color: var(--on-primary-container);
}
.ctrl-btn.theme-ctrl:hover { transform: scale(1.12) rotate(20deg); }

.ctrl-btn.dark-ctrl {
  background-color: var(--cnt-high);
  color: var(--on-surface-var);
}
.ctrl-btn.dark-ctrl:hover { transform: scale(1.12); }

/* Theme name label in rail */
.theme-name-label {
  font-size: 0.58rem;
  font-weight: 600;
  color: var(--on-surface-var);
  text-align: center;
  letter-spacing: 0.04em;
  line-height: 1;
}

/* ═══════════════════════════════════════
   TOP APP BAR (MOBILE)
═══════════════════════════════════════ */
.top-app-bar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 64px;
  background-color: var(--cnt-low);
  z-index: 300;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px 0 20px;
  border-bottom: 1px solid var(--outline-var);
}
.tbar-brand {
  font-family: 'Nunito', sans-serif;
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--primary);
}
.tbar-actions { display: flex; gap: 4px; align-items: center; }

/* ═══════════════════════════════════════
   BOTTOM NAVIGATION (MOBILE)
═══════════════════════════════════════ */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--bnav-h);
  background-color: var(--cnt-low);
  z-index: 300;
  align-items: center;
  justify-content: space-around;
  padding: 0 4px env(safe-area-inset-bottom);
  border-top: 1px solid var(--outline-var);
}
.bottom-nav .nav-item { flex: 1; padding: 6px 0 2px; width: auto; }
.bottom-nav .nav-pill { width: 64px; }

/* ═══════════════════════════════════════
   SECTIONS & LAYOUT
═══════════════════════════════════════ */
section {
  padding: 56px 48px;
  max-width: 1040px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════
   SECTION HEADER
═══════════════════════════════════════ */
.sec-head { margin-bottom: 36px; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.sec-eyebrow::before {
  content: '';
  display: block;
  width: 20px; height: 3px;
  background-color: var(--primary);
  border-radius: 3px;
}
.sec-title {
  font-family: 'Nunito', sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--on-surface);
  line-height: 1.15;
}

/* ═══════════════════════════════════════
   HERO SECTION
═══════════════════════════════════════ */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 80px;
  padding-bottom: 48px;
  gap: 40px;
}
.hero-inner {
  display: flex;
  align-items: center;
  gap: 56px;
}
.hero-text { flex: 1; min-width: 0; }

.hero-pill {
  display: inline-flex; align-items: center; gap: 8px;
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
  padding: 6px 16px 6px 8px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-pill .material-symbols-rounded { font-size: 16px; }

.hero-name {
  font-family: 'Nunito', sans-serif;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  color: var(--on-bg);
  margin-bottom: 4px;
}
.hero-name .accent { color: var(--primary); }

.hero-role {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 400;
  color: var(--on-surface-var);
  margin-bottom: 28px;
  line-height: 1.5;
}
.hero-role strong { font-weight: 600; color: var(--on-surface); }

.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 32px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: 'DM Sans', sans-serif;
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard),
    background-color var(--dt1) var(--standard);
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn .material-symbols-rounded { font-size: 18px; }
.btn-filled {
  background-color: var(--primary);
  color: var(--on-primary);
}
.btn-filled:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-tonal {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
}
.btn-tonal:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn-outlined {
  border: 1.5px solid var(--outline);
  color: var(--primary);
  background-color: transparent;
}
.btn-outlined:hover {
  background-color: var(--primary-container);
  border-color: var(--primary);
  transform: translateY(-2px);
}
.btn:active { transform: scale(0.96) translateY(0) !important; }

.hero-stats { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stat {
  background-color: var(--cnt);
  padding: 14px 20px;
  border-radius: 16px 16px 4px 16px;
  flex: 1; min-width: 110px;
}
.stat-val {
  font-family: 'Nunito', sans-serif;
  font-size: 1.6rem; font-weight: 900;
  color: var(--primary); line-height: 1; margin-bottom: 4px;
}
.stat-lbl { font-size: 0.73rem; color: var(--on-surface-var); font-weight: 500; }

.hero-avatar {
  width: 220px; height: 220px;
  flex-shrink: 0;
  background-color: var(--primary-container);
  border-radius: 60% 40% 55% 45% / 45% 55% 40% 60%;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Nunito', sans-serif;
  font-size: 5rem; font-weight: 900;
  color: var(--primary);
  animation: blob 9s ease-in-out infinite;
  overflow: hidden;
  position: relative;
}
@keyframes blob {
  0%,100% { border-radius: 60% 40% 55% 45% / 45% 55% 40% 60%; }
  25%      { border-radius: 45% 55% 40% 60% / 55% 45% 60% 40%; }
  50%      { border-radius: 50% 50% 45% 55% / 40% 60% 55% 45%; }
  75%      { border-radius: 40% 60% 60% 40% / 60% 40% 45% 55%; }
}

/* ═══════════════════════════════════════
   WORK EXPERIENCE
═══════════════════════════════════════ */
.timeline {
  display: flex; flex-direction: column; gap: 0;
  position: relative;
  padding-left: 52px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 19px; top: 20px; bottom: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--outline-var));
  border-radius: 2px;
}
.t-item {
  position: relative;
  padding-bottom: 28px;
}
.t-item:last-child { padding-bottom: 0; }

.t-dot {
  position: absolute;
  left: -44px; top: 4px;
  width: 38px; height: 38px;
  border-radius: 14px 14px 14px 4px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  z-index: 1;
  transition: transform var(--dt2) var(--spring);
}
.t-item:hover .t-dot { transform: scale(1.15) rotate(-6deg); }

.t-card {
  background-color: var(--cnt);
  border-radius: 24px 24px 24px 4px;
  padding: 24px 28px;
  border: 1px solid var(--outline-var);
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard),
    border-color var(--dt1) var(--standard);
}
.t-card:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.exp-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 8px; margin-bottom: 2px;
}
.exp-company {
  font-family: 'Nunito', sans-serif;
  font-size: 1.1rem; font-weight: 800;
  color: var(--primary);
}
.exp-badge {
  font-size: 0.72rem; font-weight: 600;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  padding: 4px 12px; border-radius: 999px;
  white-space: nowrap;
}
.exp-role {
  font-size: 0.875rem; color: var(--on-surface-var);
  margin-bottom: 14px; font-weight: 500;
}
.exp-list { display: flex; flex-direction: column; gap: 8px; }
.exp-list li {
  display: flex; gap: 10px;
  font-size: 0.875rem; line-height: 1.65;
  color: var(--on-surface);
}
.exp-list li::before {
  content: '◆';
  color: var(--primary); font-size: 0.45rem;
  margin-top: 7px; flex-shrink: 0;
}

/* ═══════════════════════════════════════
   PROJECTS
═══════════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}
.proj-card {
  background-color: var(--cnt);
  border-radius: 28px 8px 28px 28px;
  padding: 28px;
  border: 1px solid var(--outline-var);
  display: flex; flex-direction: column; gap: 14px;
  text-decoration: none; color: inherit;
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard),
    border-color var(--dt1) var(--standard);
}
.proj-card:hover {
  transform: translateY(-7px) rotate(0.4deg);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.proj-card:active { transform: translateY(-2px) scale(0.98); }

.proj-icon-row {
  display: flex; justify-content: space-between; align-items: flex-start;
}
.proj-icon {
  width: 52px; height: 52px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 18px 18px 18px 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.proj-arrow {
  width: 36px; height: 36px;
  background-color: var(--primary);
  color: var(--on-primary);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  transition: transform var(--dt2) var(--spring);
  flex-shrink: 0;
}
.proj-card:hover .proj-arrow { transform: translate(4px, -4px); }

.proj-name {
  font-family: 'Nunito', sans-serif;
  font-size: 1.1rem; font-weight: 800; color: var(--on-surface); margin-bottom: 2px;
}
.proj-sub { font-size: 0.73rem; font-weight: 600; color: var(--primary); letter-spacing: 0.03em; }
.proj-desc {
  font-size: 0.875rem; line-height: 1.65;
  color: var(--on-surface-var); flex: 1;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; }
.tag {
  font-size: 0.7rem; font-weight: 600;
  padding: 4px 10px; border-radius: 999px;
}
.tag-p { background-color: var(--primary-container); color: var(--on-primary-container); }
.tag-s { background-color: var(--secondary-container); color: var(--on-secondary-container); }
.tag-t { background-color: var(--tertiary-container); color: var(--on-tertiary-container); }

/* ═══════════════════════════════════════
   SKILLS
═══════════════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}
.skill-grp {
  background-color: var(--cnt);
  border-radius: 24px 24px 4px 24px;
  padding: 24px;
  border: 1px solid var(--outline-var);
  transition: transform var(--dt2) var(--spring);
}
.skill-grp:hover { transform: translateY(-3px); }

.sg-title {
  font-family: 'Nunito', sans-serif;
  font-size: 0.9rem; font-weight: 800; color: var(--primary);
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.sg-title .material-symbols-rounded {
  font-size: 18px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  padding: 4px; border-radius: 8px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 0.78rem; font-weight: 500;
  padding: 5px 13px; border-radius: 999px;
  background-color: var(--cnt-high);
  color: var(--on-surface);
  border: 1px solid var(--outline-var);
  cursor: default;
  transition:
    transform var(--dt2) var(--spring),
    background-color var(--dt1) var(--standard),
    color var(--dt1) var(--standard),
    border-color var(--dt1) var(--standard);
}
.chip:hover {
  transform: scale(1.08) translateY(-1px);
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  border-color: var(--primary);
}

/* ═══════════════════════════════════════
   EDUCATION
═══════════════════════════════════════ */
.edu-stack { display: flex; flex-direction: column; gap: 16px; }
.edu-card {
  background-color: var(--cnt);
  border-radius: 16px 52px 16px 16px;
  padding: 28px;
  border: 1px solid var(--outline-var);
  display: flex; gap: 20px; align-items: flex-start;
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard);
}
.edu-card:hover { transform: translateX(6px); box-shadow: var(--shadow-sm); }

.edu-icon {
  width: 52px; height: 52px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; flex-shrink: 0;
}
.edu-school {
  font-family: 'Nunito', sans-serif;
  font-size: 1.05rem; font-weight: 800; color: var(--on-surface);
}
.edu-degree {
  font-size: 0.875rem; color: var(--on-surface-var); margin: 3px 0 10px; font-weight: 400;
}
.edu-pills { display: flex; gap: 8px; flex-wrap: wrap; }
.edu-pill {
  font-size: 0.73rem; font-weight: 600;
  padding: 3px 12px; border-radius: 999px;
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
}
.edu-pill.year {
  background-color: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

/* ═══════════════════════════════════════
   ACHIEVEMENTS
═══════════════════════════════════════ */
.ach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.ach-item {
  background-color: var(--cnt);
  border-radius: 20px 20px 4px 20px;
  padding: 16px 18px;
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid var(--outline-var);
  transition: transform var(--dt2) var(--spring);
}
.ach-item:hover { transform: scale(1.03) rotate(0.3deg); }
.ach-emoji { font-size: 1.4rem; line-height: 1; flex-shrink: 0; margin-top: 1px; }
.ach-text { font-size: 0.85rem; font-weight: 500; color: var(--on-surface); line-height: 1.45; }

/* ═══════════════════════════════════════
   CERTIFICATIONS
═══════════════════════════════════════ */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 16px;
}
.cert-card {
  background-color: var(--cnt);
  border-radius: 24px 8px 24px 24px;
  padding: 18px 22px;
  border: 1px solid var(--outline-var);
  display: flex; gap: 14px; align-items: center;
  text-decoration: none; color: inherit;
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard),
    border-color var(--dt1) var(--standard);
}
.cert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.cert-icon {
  width: 44px; height: 44px;
  background-color: var(--tertiary-container);
  color: var(--on-tertiary-container);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.cert-name { font-size: 0.875rem; font-weight: 600; color: var(--on-surface); line-height: 1.3; }
.cert-issuer { font-size: 0.73rem; color: var(--on-surface-var); margin-top: 2px; }

/* ═══════════════════════════════════════
   COMPETITIVE PROGRAMMING
═══════════════════════════════════════ */
.cp-row { display: flex; gap: 16px; flex-wrap: wrap; }
.cp-card {
  background-color: var(--primary-container);
  border-radius: 24px 24px 4px 24px;
  padding: 20px 24px;
  flex: 1; min-width: 150px;
  text-decoration: none;
  color: var(--on-primary-container);
  border: 1px solid transparent;
  transition:
    transform var(--dt2) var(--spring),
    box-shadow var(--dt2) var(--standard),
    border-color var(--dt1) var(--standard);
}
.cp-card:hover { transform: translateY(-5px) scale(1.02); box-shadow: var(--shadow-md); border-color: var(--primary); }
.cp-platform { font-size: 0.7rem; font-weight: 700; opacity: 0.65; letter-spacing: 0.07em; text-transform: uppercase; }
.cp-rank { font-family: 'Nunito', sans-serif; font-size: 1.35rem; font-weight: 900; line-height: 1.2; margin: 5px 0 2px; }
.cp-rating { font-size: 0.82rem; font-weight: 500; }

/* ═══════════════════════════════════════
   PUBLICATIONS
═══════════════════════════════════════ */
.pub-stack { display: flex; flex-direction: column; gap: 14px; }
.pub-item {
  background-color: var(--cnt);
  border-radius: 20px 20px 4px 20px;
  padding: 20px 24px;
  border: 1px solid var(--outline-var);
  display: flex; gap: 14px; align-items: flex-start;
  transition: transform var(--dt2) var(--spring);
}
.pub-item:hover { transform: translateX(5px); }
.pub-num {
  font-family: 'Nunito', sans-serif;
  font-size: 1.4rem; font-weight: 900;
  color: var(--primary-container);
  -webkit-text-stroke: 2px var(--primary);
  flex-shrink: 0; line-height: 1; margin-top: 2px; min-width: 28px;
}
.pub-title { font-size: 0.9rem; font-weight: 600; color: var(--on-surface); margin-bottom: 4px; line-height: 1.4; }
.pub-venue { font-size: 0.78rem; color: var(--on-surface-var); }

/* ═══════════════════════════════════════
   SCROLL REVEAL
═══════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--dt3) var(--decelerate),
    transform var(--dt3) var(--spring);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: 80ms; }
.d2 { transition-delay: 160ms; }
.d3 { transition-delay: 240ms; }
.d4 { transition-delay: 320ms; }
.d5 { transition-delay: 400ms; }

/* ═══════════════════════════════════════
   PAGE LOAD HERO ANIMATIONS
═══════════════════════════════════════ */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pop-in {
  from { opacity: 0; transform: scale(0.75); }
  to   { opacity: 1; transform: scale(1); }
}
.hero-pill   { animation: fade-up var(--dt3) var(--decelerate) 80ms  both; }
.hero-name   { animation: fade-up var(--dt4) var(--decelerate) 150ms both; }
.hero-role   { animation: fade-up var(--dt3) var(--decelerate) 240ms both; }
.hero-ctas   { animation: fade-up var(--dt3) var(--decelerate) 320ms both; }
.hero-stats  { animation: fade-up var(--dt3) var(--decelerate) 400ms both; }
.hero-avatar { animation: pop-in  var(--dt4) var(--spring)     100ms both; }

/* ═══════════════════════════════════════
   FAB
═══════════════════════════════════════ */
.fab {
  position: fixed;
  right: 24px; bottom: 28px;
  width: 56px; height: 56px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  box-shadow: var(--shadow-md);
  transition:
    transform var(--dt2) var(--spring),
    opacity var(--dt2) var(--standard),
    background-color var(--dt2) var(--standard);
  opacity: 0; pointer-events: none; z-index: 200;
}
.fab.show { opacity: 1; pointer-events: all; }
.fab:hover { transform: translateY(-4px) scale(1.1); }
.fab:active { transform: scale(0.9); }

/* ═══════════════════════════════════════
   SNACKBAR
═══════════════════════════════════════ */
.snackbar {
  position: fixed;
  bottom: 28px; left: 50%; transform: translateX(-50%) translateY(80px);
  background-color: var(--cnt-highest);
  color: var(--on-surface);
  border: 1px solid var(--outline-var);
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 0.875rem; font-weight: 600;
  display: flex; align-items: center; gap: 10px;
  z-index: 500;
  transition: transform var(--dt2) var(--spring), opacity var(--dt2) var(--standard);
  opacity: 0; pointer-events: none;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
}
.snackbar.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.snackbar .dot {
  width: 12px; height: 12px; border-radius: 50%;
  background-color: var(--primary);
  transition: background-color var(--dt2) var(--standard);
}

/* ═══════════════════════════════════════
   OPEN SOURCE / MISC
═══════════════════════════════════════ */
.os-card {
  background: linear-gradient(135deg, var(--primary-container), var(--secondary-container));
  border-radius: 28px 28px 4px 28px;
  padding: 28px 32px;
  display: flex; gap: 20px; align-items: flex-start;
  flex-wrap: wrap;
  border: 1px solid var(--outline-var);
}
.os-stat {
  text-align: center; flex: 1; min-width: 110px;
}
.os-stat-val {
  font-family: 'Nunito', sans-serif;
  font-size: 2rem; font-weight: 900;
  color: var(--primary); line-height: 1; margin-bottom: 4px;
}
.os-stat-lbl { font-size: 0.78rem; font-weight: 500; color: var(--on-surface-var); }

/* ═══════════════════════════════════════
   FOOTER
═══════════════════════════════════════ */
footer {
  margin-left: var(--rail-w);
  padding: 32px 48px;
  border-top: 1px solid var(--outline-var);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
  font-size: 0.82rem; color: var(--on-surface-var);
}
.footer-links { display: flex; gap: 12px; }
.footer-link { color: var(--primary); font-weight: 600; text-decoration: none; font-size: 0.82rem; }
.footer-link:hover { text-decoration: underline; }

/* ═══════════════════════════════════════
   SCROLLBAR
═══════════════════════════════════════ */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--cnt-low); }
::-webkit-scrollbar-thumb { background: var(--outline-var); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ═══════════════════════════════════════
   RESPONSIVE — TABLET
═══════════════════════════════════════ */
@media (min-width: 769px) and (max-width: 1100px) {
  section { padding: 48px 32px; }
}

/* ═══════════════════════════════════════
   RESPONSIVE — MOBILE
═══════════════════════════════════════ */
@media (max-width: 768px) {
  :root {
    --rail-w: 0px;
    --tbar-h: 64px;
  }

  .nav-rail { display: none; }
  .top-app-bar { display: flex; }
  .bottom-nav { display: flex; }
  .fab { bottom: calc(var(--bnav-h) + 16px); right: 16px; }
  .snackbar { bottom: calc(var(--bnav-h) + 12px); }

  main {
    margin-left: 0;
    padding-top: var(--tbar-h);
    padding-bottom: var(--bnav-h);
  }

  footer {
    margin-left: 0;
    padding: 24px 20px;
    flex-direction: column;
    text-align: center;
  }

  section { padding: 44px 20px; }

  #hero {
    min-height: calc(100vh - var(--tbar-h));
    padding-top: 40px;
    gap: 28px;
  }
  .hero-inner {
    flex-direction: column-reverse;
    align-items: center;
    gap: 28px;
    text-align: center;
  }
  .hero-avatar { width: 150px; height: 150px; font-size: 3.5rem; }
  .hero-ctas { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-stat { min-width: 95px; }

  .timeline { padding-left: 44px; }
  .timeline::before { left: 15px; }
  .t-dot { left: -40px; width: 34px; height: 34px; font-size: 16px; }
  .t-card { padding: 18px 20px; border-radius: 20px 20px 20px 4px; }

  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid   { grid-template-columns: 1fr; }
  .ach-grid      { grid-template-columns: 1fr; }
  .certs-grid    { grid-template-columns: 1fr; }
  .cp-row        { flex-direction: column; }
  .cp-card       { min-width: unset; }
  .os-card       { padding: 20px; gap: 16px; }

  .edu-card {
    flex-direction: column; gap: 12px;
    border-radius: 20px 20px 4px 20px;
  }
}

/* ═══════════════════════════════════════
   SECTION DIVIDER
═══════════════════════════════════════ */
.sec-line {
  height: 1px;
  background-color: var(--outline-var);
  margin: 0 calc(var(--rail-w) + 48px) 0 calc(var(--rail-w) + 48px);
  max-width: 100%;
}
@media (max-width: 768px) {
  .sec-line { margin: 0 20px; }
}