/* ==========================================================================
   Krishnaditya Kancharla — Modern Dark Mode Design System
   Curated HSL Dark Palette · Editorial Typography · Fluid Responsive Layout
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  /* Base Dark Surfaces (Obsidian & Slate — Zero Purple) */
  --bg-canvas: hsl(220, 22%, 6%);
  --bg-elevated: hsl(220, 18%, 9.5%);
  --bg-surface: hsl(220, 16%, 12%);
  --bg-surface-hover: hsl(220, 15%, 15%);
  --bg-glass: hsla(220, 20%, 8%, 0.84);

  /* Subtle Surface Texture & Depth */
  --surface-highlight: inset 0 1px 0 0 hsla(210, 30%, 96%, 0.06);
  --shadow-sm: 0 2px 8px -2px hsla(220, 40%, 2%, 0.5);
  --shadow-md: 0 12px 32px -8px hsla(220, 45%, 2%, 0.65);
  --shadow-lg: 0 24px 48px -12px hsla(220, 50%, 2%, 0.8);

  /* Neutral Hairline Borders */
  --border-subtle: hsla(215, 20%, 88%, 0.08);
  --border-default: hsla(215, 20%, 88%, 0.13);
  --border-strong: hsla(215, 20%, 88%, 0.22);

  /* Typography Colors */
  --text-primary: hsl(210, 25%, 96%);
  --text-secondary: hsl(215, 14%, 72%);
  --text-muted: hsl(215, 12%, 52%);

  /* Harmonious Accents (Sky Cyan, Emerald, Warm Amber) */
  --accent-primary: hsl(196, 88%, 56%);
  --accent-primary-soft: hsla(196, 88%, 56%, 0.12);
  --accent-emerald: hsl(158, 68%, 48%);
  --accent-emerald-soft: hsla(158, 68%, 48%, 0.12);
  --accent-amber: hsl(38, 92%, 60%);
  --accent-amber-soft: hsla(38, 92%, 60%, 0.12);

  /* Typography Families */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Layout & Spacing */
  --container-max: 1160px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition-fast: 160ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-base: 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-canvas);
  background-image: radial-gradient(
    ellipse 80% 50% at 50% -10%,
    hsla(196, 80%, 45%, 0.08),
    transparent 70%
  );
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  selection-background-color: var(--accent-primary-soft);
}

::selection {
  background: hsla(196, 88%, 56%, 0.25);
  color: var(--text-primary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

/* Container */
.site-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 1.5rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  box-shadow: var(--surface-highlight);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-primary);
  letter-spacing: 0.04em;
}

.brand-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link-item {
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link-item:hover,
.nav-link-item.active {
  color: var(--text-primary);
  background: hsla(215, 20%, 88%, 0.06);
}

.nav-divider {
  width: 1px;
  height: 18px;
  background: var(--border-default);
  margin: 0 0.35rem;
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--bg-canvas);
  background: var(--text-primary);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.nav-cta:hover {
  background: var(--accent-primary);
  color: var(--bg-canvas);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* ==========================================================================
   Hero / Intro Section
   ========================================================================== */
.hero-section {
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.6vw, 3.75rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.015em;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.hero-subtitle strong {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-typed-line {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--accent-emerald);
  margin-bottom: 1.5rem;
  min-height: 1.5em;
}

.hero-summary {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.72;
  margin-bottom: 1rem;
  max-width: 64ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.72rem 1.35rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-canvas);
}

.btn-primary:hover {
  background: var(--accent-primary);
  color: var(--bg-canvas);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-default);
  box-shadow: var(--surface-highlight);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--surface-highlight);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-pill:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
  border-color: var(--border-default);
  transform: translateY(-1px);
}

.social-pill svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

/* Profile Card in Hero */
.hero-profile-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--surface-highlight), var(--shadow-lg);
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  margin-bottom: 1.5rem;
}

.profile-avatar {
  width: 84px;
  height: 84px;
  border-radius: var(--radius-md);
  object-fit: cover;
  border: 1px solid var(--border-strong);
  flex-shrink: 0;
}

.profile-identity h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.profile-identity .role-line {
  font-size: 0.9rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-top: 0.15rem;
}

.profile-identity .loc-line {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.profile-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.35rem;
}

.stat-tile {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  box-shadow: var(--surface-highlight);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.profile-current-focus {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.profile-current-focus .focus-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  margin-bottom: 0.3rem;
  display: block;
}

/* ==========================================================================
   Section Layout & Headings
   ========================================================================== */
.section-block {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2.75rem;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  margin-bottom: 0.45rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.15;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  max-width: 58ch;
  margin-top: 0.5rem;
}

/* Filter Tabs */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  background: var(--bg-elevated);
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.42rem 0.85rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
}

.filter-btn.active {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  box-shadow: var(--surface-highlight), var(--shadow-sm);
}

/* ==========================================================================
   Experience / Career Timeline (#my-journey)
   ========================================================================== */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.exp-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--surface-highlight), var(--shadow-sm);
  transition: border-color var(--transition-base), background var(--transition-base);
}

.exp-card:hover {
  border-color: var(--border-default);
  background: hsl(220, 17%, 10.5%);
}

.exp-card[hidden] {
  display: none !important;
}

.exp-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.exp-org-group {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.exp-logo-box {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.exp-logo-box img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.exp-logo-box svg {
  width: 24px;
  height: 24px;
}

.exp-role-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.exp-company-line {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.exp-meta-right {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.exp-meta-right .exp-period {
  color: var(--text-secondary);
  font-weight: 500;
  display: block;
}

.exp-badge-current {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--accent-emerald-soft);
  color: var(--accent-emerald);
  margin-left: 0.5rem;
  vertical-align: middle;
}

.exp-subroles {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  margin-top: 0.85rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border-default);
}

.exp-subrole-item {
  position: relative;
}

.exp-subrole-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.exp-subrole-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.exp-subrole-date {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.exp-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.exp-bullets li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.exp-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
}

.exp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.1rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* ==========================================================================
   Skills & Areas of Expertise (#skills)
   ========================================================================== */
.expertise-banner {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin-bottom: 2rem;
  box-shadow: var(--surface-highlight);
}

.expertise-banner-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.expertise-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.expertise-pill {
  padding: 0.42rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 1.25rem;
}

.skill-group-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--surface-highlight), var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.skill-group-card:hover {
  border-color: var(--border-default);
}

.skill-group-card[hidden] {
  display: none !important;
}

.skill-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.skill-group-title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.skill-group-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.skill-items-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.skill-chip {
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: 0.83rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.skill-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-surface-hover);
}

.skill-chip.skill-featured {
  color: var(--text-primary);
  border-color: hsla(196, 88%, 56%, 0.3);
  background: var(--accent-primary-soft);
}

/* ==========================================================================
   Publications, Projects & Articles (#publications)
   ========================================================================== */
.pub-featured-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--surface-highlight), var(--shadow-md);
}

.pub-badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.badge-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.22rem 0.65rem;
  border-radius: 4px;
  background: var(--accent-amber-soft);
  color: var(--accent-amber);
}

.pub-doi {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.pub-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.pub-authors {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.pub-abstract {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 1.15rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  margin-top: 1rem;
}

.projects-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.work-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--surface-highlight), var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.work-card:hover {
  border-color: var(--border-default);
  transform: translateY(-2px);
}

.work-type {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 0.55rem;
}

.work-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
  line-height: 1.35;
}

.work-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.15rem;
}

.work-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.work-link {
  color: var(--text-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.work-link:hover {
  color: var(--accent-primary);
}

/* ==========================================================================
   Education, Certifications & Honors (#education)
   ========================================================================== */
.edu-honors-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.column-subhead {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stack-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--surface-highlight);
}

.stack-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
}

.stack-card-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.stack-card-date {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.stack-card-subtitle {
  font-size: 0.9rem;
  color: var(--accent-primary);
  font-weight: 500;
  margin-top: 0.2rem;
}

.stack-card-note {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.45rem;
}

/* ==========================================================================
   Quotes & Philosophy (#programming-quotes)
   ========================================================================== */
.quotes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.quote-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.65rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--surface-highlight);
}

.quote-text {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.68;
  font-style: italic;
  margin-bottom: 1.25rem;
}

.quote-author {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Bucket List Interactive Grid (Used on /bucketlist and preview)
   ========================================================================== */
.bucket-stats-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.75rem;
}

.bucket-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.85rem;
}

.bucket-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  box-shadow: var(--surface-highlight);
  transition: border-color var(--transition-fast);
}

.bucket-item.completed {
  border-color: hsla(158, 68%, 48%, 0.28);
  background: hsla(158, 68%, 48%, 0.05);
}

.bucket-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 24px;
  padding-top: 0.1rem;
}

.bucket-item.completed .bucket-index {
  color: var(--accent-emerald);
}

.bucket-text {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.bucket-item.completed .bucket-text {
  text-decoration: line-through;
  color: var(--text-secondary);
}

.bucket-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-emerald);
  margin-top: 0.2rem;
}

/* ==========================================================================
   Contact & Footer (#home-footer)
   ========================================================================== */
.footer-section {
  padding: 5rem 0 3.5rem;
  background: hsl(220, 24%, 4.5%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.contact-channel-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--surface-highlight);
  transition: all var(--transition-fast);
}

.contact-channel-item:hover {
  border-color: var(--border-default);
  background: var(--bg-surface);
}

.channel-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.channel-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.channel-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-form-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--surface-highlight), var(--shadow-md);
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-bottom: 0.45rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 0.95rem;
  border-radius: var(--radius-sm);
  background: var(--bg-canvas);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
}

textarea.form-control {
  resize: vertical;
  min-height: 110px;
}

.footer-bottom {
  margin-top: 4rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Toast Notification */
.copy-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  padding: 0.75rem 1.15rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 200;
}

.copy-toast.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 960px) {
  .hero-grid,
  .edu-honors-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .quotes-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-default);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.5rem;
    gap: 0.35rem;
    display: none;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-divider {
    width: 100%;
    height: 1px;
    margin: 0.4rem 0;
  }

  .hero-section {
    padding: 3.5rem 0 3rem;
  }

  .section-block {
    padding: 3.5rem 0;
  }

  .exp-meta-right {
    text-align: left;
  }
}