/* ============================================================
   Carlos Encalada — Web Personal
   Paleta: #4C6472 slate · #57A4B1 teal (main) · #B0D894 green
            #FADE89 yellow · #DD4124 coral
   ============================================================ */

:root {
  /* Surfaces */
  --bg:           #F7F2E7;   /* cream paper */
  --bg-alt:       #F1EADC;   /* subtle band */
  --surface:      #FFFFFF;
  --surface-soft: #FAF5EA;
  --border:       #E5DDC9;
  --border-soft:  #EDE5D2;

  /* Ink */
  --fg:           #2A3A42;
  --fg-soft:      #4C6472;
  --muted:        #7A8B93;

  /* Brand */
  --teal:         #57A4B1;
  --teal-deep:    #4C6472;
  --teal-soft:    #C8E2E7;
  --teal-pale:    #E4F0F2;

  /* Accents */
  --green:        #B0D894;
  --green-pale:   #E2EFD3;
  --yellow:       #FADE89;
  --yellow-pale:  #FCEFC1;
  --coral:        #DD4124;
  --coral-pale:   #F8D6CB;

  /* Type */
  --font-serif:   'Newsreader', 'Iowan Old Style', 'Charter', Georgia, serif;
  --font-sans:    'Overpass', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono:    ui-monospace, 'JetBrains Mono', 'IBM Plex Mono', Menlo, monospace;

  /* Geometry */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(42, 58, 66, 0.04), 0 1px 3px rgba(42, 58, 66, 0.06);
  --shadow-md: 0 4px 12px rgba(42, 58, 66, 0.06), 0 2px 4px rgba(42, 58, 66, 0.04);
  --shadow-lg: 0 12px 32px rgba(42, 58, 66, 0.10), 0 4px 12px rgba(42, 58, 66, 0.06);
}

html.dark {
  --bg:           #1F2A30;
  --bg-alt:       #243137;
  --surface:      #2A373E;
  --surface-soft: #243137;
  --border:       #3A4951;
  --border-soft:  #324047;

  --fg:           #F4EFE2;
  --fg-soft:      #D4DEE2;
  --muted:        #9FB0B7;

  --teal-soft:    #2F4E55;
  --teal-pale:    #294048;

  --green-pale:   #2D4034;
  --yellow-pale:  #3F3826;
  --coral-pale:   #4A2C25;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.20), 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.25), 0 2px 4px rgba(0,0,0,0.20);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.35), 0 4px 12px rgba(0,0,0,0.25);
}

/* ============================================================
   Base
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  background-color: var(--bg);
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

::selection {
  background-color: var(--teal);
  color: #fff;
}

/* Smooth color transitions on theme switch */
body, .site-header, .section, .timeline-card, .project-card,
.about-card, .btn, .project-link, .tag, .social-links a,
.project-card-footer a {
  transition: background-color 220ms ease, color 220ms ease,
              border-color 220ms ease;
}

/* ============================================================
   Header
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.header-branding {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--fg);
  display: inline-flex;
  align-items: baseline;
  gap: 0;
}

.site-title-mark {
  font-style: italic;
  color: var(--teal);
}

.menu-toggle,
.theme-toggle {
  background: none;
  border: 1px solid transparent;
  color: var(--fg-soft);
  cursor: pointer;
  font-size: 1.5rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--r-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 180ms ease, color 180ms ease;
}

.menu-toggle:hover,
.theme-toggle:hover {
  background-color: var(--teal-pale);
  color: var(--teal-deep);
}

.theme-toggle i {
  font-size: 1.15rem;
}

.main-nav {
  width: 100%;
  display: none;
  border-top: 1px solid var(--border-soft);
  padding-top: 0.5rem;
}

.main-nav.open {
  display: block;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  position: relative;
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--fg-soft);
  padding: 0.5rem 0.75rem;
  border-radius: var(--r-sm);
  transition: color 180ms ease;
}

.nav-link:hover {
  color: var(--teal);
}

.nav-link.active {
  color: var(--teal);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.2rem;
  height: 2px;
  background-color: var(--teal);
  border-radius: 2px;
}

.desktop-only {
  display: none;
}

/* ============================================================
   Layout
   ============================================================ */

.site-main {
  width: 100%;
}

.section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-soft);
  background-color: var(--bg);
}

.section:nth-of-type(even) {
  background-color: var(--bg-alt);
}

.section-hero {
  padding-top: 2.5rem;
  padding-bottom: 0;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Section heads */
.section-head {
  margin-bottom: 2.5rem;
}

.section-head-center {
  text-align: center;
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.85rem;
}

.section-index::before {
  content: "✱";
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--coral);
  line-height: 1;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.65rem, 4.2vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin: 0;
  max-width: 24ch;
}

.section-head-center .section-title {
  margin-left: auto;
  margin-right: auto;
}

.section-title em {
  font-style: italic;
  color: var(--teal);
  font-weight: 400;
}

.section-lede {
  max-width: 56ch;
  margin: 1rem auto 0;
  font-size: 1rem;
  color: var(--fg-soft);
  line-height: 1.65;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-soft);
}

.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--green);
  box-shadow: 0 0 0 4px var(--green-pale);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.6; transform: scale(0.85); }
}

/* ============================================================
   Hero
   ============================================================ */

.section-hero {
  background-color: var(--bg);
  border-bottom: none;
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-top: 2rem;
  padding-bottom: 3rem;
  align-items: center;
}

.hero-text .eyebrow {
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 8vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0 0 1.5rem;
  text-wrap: balance;
}

.hero-title em {
  font-style: italic;
  color: var(--teal);
  font-weight: 500;
  position: relative;
  white-space: nowrap;
}

.hero-title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.05em;
  height: 0.12em;
  background-color: var(--yellow);
  border-radius: 1em;
  z-index: -1;
  opacity: 0.7;
}

.hero-lede {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--fg-soft);
  margin: 0 0 1.75rem;
  max-width: 46ch;
}

.hero-lede strong {
  color: var(--fg);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  border-radius: var(--r-pill);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1),
              background-color 180ms ease,
              color 180ms ease,
              box-shadow 180ms ease;
  text-decoration: none;
}

.btn i {
  font-size: 1rem;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:hover i {
  transform: translateX(3px);
}

.btn-primary {
  background-color: var(--teal);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--teal-deep);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background-color: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal);
  background-color: var(--teal-pale);
}

/* Hero portrait */
.hero-portrait {
  position: relative;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-sunburst {
  position: absolute;
  inset: -10%;
  width: 120%;
  height: 120%;
  color: var(--coral);
  opacity: 0.85;
  animation: spin 60s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hero-portrait-frame {
  position: relative;
  width: 72%;
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  background-color: var(--teal-pale);
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--surface);
  z-index: 2;
}

.hero-portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.hero-portrait-badge {
  position: absolute;
  bottom: 6%;
  right: 4%;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background-color: var(--yellow);
  color: var(--fg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  z-index: 3;
  box-shadow: var(--shadow-md);
  transform: rotate(-8deg);
}

.badge-line {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-soft);
  line-height: 1;
}

.badge-num {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 1.1;
}

/* Hero marquee strip */
.hero-strip {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  justify-content: center;
  padding: 1.25rem 1rem;
  margin-top: 1rem;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background-color: var(--bg-alt);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--fg-soft);
}

.strip-dot {
  color: var(--coral);
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

/* ============================================================
   About
   ============================================================ */

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* aside appears first on mobile (above bio) and on the left on desktop */

.about-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  box-shadow: var(--shadow-sm);
}

.about-card-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.85rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px dashed var(--border);
}

.about-card-row:last-child,
.about-card-row-tag {
  border-bottom: none;
  padding-bottom: 0;
}

.about-card-row-tag {
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0.4rem;
  padding-top: 0.4rem;
}

.about-card-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.about-card-value {
  font-weight: 500;
  color: var(--fg);
  text-align: right;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  border-radius: var(--r-pill);
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.tag-teal {
  background-color: var(--teal-pale);
  color: var(--teal-deep);
}

.tag-coral {
  background-color: var(--coral-pale);
  color: var(--coral);
}

html.dark .tag-teal { color: var(--teal); }

.about-bio {
  color: var(--fg-soft);
}

.about-bio p {
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 1.1rem;
}

.about-bio p:last-child {
  margin-bottom: 0;
}

.about-bio strong {
  color: var(--fg);
  font-weight: 600;
}

.about-bio em {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--teal);
  font-weight: 500;
}

/* ============================================================
   Timeline
   ============================================================ */

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 2.5rem;
}

.timeline-line {
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 1.05rem;
  width: 2px;
  background:
    linear-gradient(to bottom,
      var(--teal) 0%,
      var(--teal) 100%);
  border-radius: 2px;
}

.timeline-line::before,
.timeline-line::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--coral);
  transform: translateX(-50%);
}

.timeline-line::before { top: -8px; }
.timeline-line::after  { bottom: -8px; }

.timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: 1.75rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.5rem;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background-color: var(--surface);
  color: var(--teal);
  border: 2px solid var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 2;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
              background-color 220ms ease, color 220ms ease;
}

.timeline-item:hover .timeline-marker {
  background-color: var(--teal);
  color: #fff;
  transform: scale(1.08);
}

.timeline-card {
  flex: 1;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 240ms cubic-bezier(0.22, 1, 0.36, 1),
              border-color 240ms ease;
}

.timeline-item:hover .timeline-card {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--teal-soft);
}

.timeline-arrow {
  position: absolute;
  top: 1.1rem;
  left: -8px;
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 8px solid var(--surface);
  filter: drop-shadow(-1px 0 0 var(--border));
}

.timeline-content {
  padding: 1.1rem 1.25rem;
}

.timeline-content h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0.4rem 0 0.4rem;
  line-height: 1.25;
  color: var(--fg);
  letter-spacing: -0.005em;
}

.timeline-date {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-deep);
  background-color: var(--teal-pale);
  padding: 0.18rem 0.65rem;
  border-radius: var(--r-pill);
}

.timeline-content p {
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 0 0 0.5rem;
  color: var(--fg-soft);
}

.timeline-content p:last-child {
  margin-bottom: 0;
}

.timeline-content a {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 180ms ease;
}

.timeline-content a:hover {
  color: var(--coral);
}

/* ============================================================
   Projects
   ============================================================ */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.project-card {
  --accent: var(--teal);
  --accent-pale: var(--teal-pale);

  position: relative;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 280ms cubic-bezier(0.22, 1, 0.36, 1),
              border-color 280ms ease;
}

.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  border: 2px solid transparent;
  pointer-events: none;
  transition: border-color 280ms ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card:hover::before {
  border-color: var(--accent);
}

.project-accent-teal   { --accent: var(--teal);   --accent-pale: var(--teal-pale); }
.project-accent-coral  { --accent: var(--coral);  --accent-pale: var(--coral-pale); }
.project-accent-yellow { --accent: var(--yellow); --accent-pale: var(--yellow-pale); }
.project-accent-green  { --accent: var(--green);  --accent-pale: var(--green-pale); }

.project-card-inner {
  position: relative;
  padding: 1.5rem 1.4rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 270px;
  z-index: 1;
}

.project-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.project-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--r-md);
  background-color: var(--accent-pale);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.project-accent-yellow .project-icon { color: #8C6A00; }
.project-accent-green  .project-icon { color: #4A6E32; }

html.dark .project-accent-yellow .project-icon { color: var(--yellow); }
html.dark .project-accent-green  .project-icon { color: var(--green); }

.project-status {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.7rem;
  border-radius: var(--r-pill);
  background-color: var(--bg-alt);
  border: 1px solid var(--border-soft);
  white-space: nowrap;
}

.project-card-body {
  flex: 1;
}

.project-category {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.45rem;
}

.project-accent-yellow .project-category { color: #8C6A00; }
.project-accent-green  .project-category { color: #4A6E32; }
html.dark .project-accent-yellow .project-category { color: var(--yellow); }
html.dark .project-accent-green  .project-category { color: var(--green); }

.project-card-body h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
  line-height: 1.2;
  color: var(--fg);
}

.project-card-body p {
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
  color: var(--fg-soft);
}

.project-card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--r-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg);
  background-color: var(--bg-alt);
  border: 1px solid var(--border);
  transition: background-color 200ms ease, color 200ms ease,
              border-color 200ms ease, transform 200ms ease;
}

.project-link i {
  font-size: 0.9rem;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.project-link:hover {
  background-color: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.project-accent-yellow .project-link:hover { color: var(--fg); }
.project-accent-green  .project-link:hover { color: var(--fg); }

.project-link:hover i {
  transform: translate(2px, -2px);
}

.project-link-ghost {
  background-color: transparent;
}

/* Decorations — softened from the original */
.project-decoration {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 130px;
  height: 130px;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}

.decoration-waves {
  background: radial-gradient(circle at 100% 100%, var(--accent) 0%, transparent 60%);
  opacity: 0.25;
}

.decoration-dots {
  background-image: radial-gradient(circle, var(--accent) 1.5px, transparent 2px);
  background-size: 12px 12px;
  opacity: 0.3;
}

.decoration-lines {
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 5px,
    var(--accent) 5px,
    var(--accent) 6px
  );
  clip-path: circle(70% at 100% 100%);
  opacity: 0.25;
}

.decoration-circles {
  background: radial-gradient(circle at 100% 100%, var(--accent) 0%, transparent 50%);
  opacity: 0.3;
}

.decoration-grid {
  background-image:
    linear-gradient(var(--accent) 1px, transparent 1px),
    linear-gradient(90deg, var(--accent) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: 0.18;
}

.decoration-zigzag {
  background:
    linear-gradient(135deg, var(--accent) 25%, transparent 25%) -8px 0,
    linear-gradient(225deg, var(--accent) 25%, transparent 25%) -8px 0;
  background-size: 16px 16px;
  opacity: 0.22;
}

/* ============================================================
   Contact
   ============================================================ */

.section-contact {
  background-color: var(--bg-alt);
}

.contact-form {
  max-width: 640px;
  margin: 0 auto 2rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.contact-form iframe {
  display: block;
  width: 100%;
  border: none;
  border-radius: var(--r-md);
}

.social-block {
  text-align: center;
}

.social-label {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--fg-soft);
  margin-bottom: 1rem;
}

.social-label::before,
.social-label::after {
  content: "";
  width: 28px;
  height: 1px;
  background-color: var(--border);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: var(--surface);
  border: 1px solid var(--border);
  font-size: 1.15rem;
  color: var(--fg-soft);
  transition: transform 200ms cubic-bezier(0.22, 1, 0.36, 1),
              background-color 200ms ease,
              color 200ms ease,
              border-color 200ms ease;
}

.social-links a:hover {
  background-color: var(--teal);
  color: #fff;
  border-color: var(--teal);
  transform: translateY(-3px);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  padding: 1.75rem 0;
  background-color: var(--bg);
  border-top: 1px solid var(--border-soft);
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.footer-sep {
  color: var(--coral);
}

/* ============================================================
   Responsive — tablet (≥ 768px)
   ============================================================ */

@media (min-width: 768px) {
  .section {
    padding: 5.5rem 0;
  }

  .header-inner {
    flex-direction: row;
    justify-content: space-between;
    padding: 1rem 2rem;
    gap: 2rem;
  }

  .header-branding {
    width: auto;
    gap: 1rem;
  }

  .site-title {
    font-size: 1.5rem;
  }

  .menu-toggle,
  .mobile-only {
    display: none;
  }

  .desktop-only {
    display: inline-flex;
  }

  .main-nav {
    display: block;
    width: auto;
    border-top: none;
    padding-top: 0;
  }

  .nav-list {
    flex-direction: row;
    gap: 0.25rem;
  }

  .nav-link {
    font-size: 0.95rem;
  }

  .container {
    padding: 0 2rem;
  }

  /* Hero */
  .hero-container {
    grid-template-columns: 1.15fr 1fr;
    gap: 3.5rem;
    padding-top: 3.5rem;
    padding-bottom: 4.5rem;
  }

  .hero-portrait {
    max-width: 420px;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr 1.7fr;
    gap: 2.5rem;
    align-items: start;
  }

  .about-aside {
    position: sticky;
    top: 6rem;
  }

  /* Timeline — alternating layout */
  .timeline {
    padding-left: 0;
    max-width: 1000px;
  }

  .timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item {
    margin-bottom: 2.5rem;
    align-items: center;
  }

  .timeline-marker {
    left: 50%;
    transform: translateX(-50%);
    top: auto;
    width: 2.75rem;
    height: 2.75rem;
    background-color: var(--surface);
    box-shadow: 0 0 0 6px var(--bg);
  }

  html.dark .timeline-marker {
    box-shadow: 0 0 0 6px var(--bg);
  }

  .timeline-item:hover .timeline-marker {
    transform: translateX(-50%) scale(1.1);
  }

  .timeline-card {
    width: calc(50% - 2.5rem);
  }

  .timeline-left {
    flex-direction: row;
  }

  .timeline-right {
    flex-direction: row-reverse;
  }

  .timeline-left .timeline-card {
    margin-right: auto;
  }

  .timeline-right .timeline-card {
    margin-left: auto;
  }

  .timeline-left .timeline-arrow {
    left: auto;
    right: -8px;
    border-right: none;
    border-left: 8px solid var(--surface);
    filter: drop-shadow(1px 0 0 var(--border));
  }

  .timeline-right .timeline-arrow {
    left: -8px;
    right: auto;
  }

  /* Projects */
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .project-card-inner {
    padding: 1.75rem 1.6rem 1.5rem;
    min-height: 290px;
  }

  /* Hero strip — single line on tablet+ */
  .hero-strip {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 1.4rem 2rem;
    scrollbar-width: none;
  }

  .hero-strip::-webkit-scrollbar {
    display: none;
  }
}

/* ============================================================
   Responsive — desktop (≥ 1024px)
   ============================================================ */

@media (min-width: 1024px) {
  .section {
    padding: 7rem 0;
  }

  .nav-link {
    font-size: 1rem;
  }

  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-container {
    gap: 5rem;
    padding-top: 5rem;
    padding-bottom: 6rem;
  }

  .hero-portrait {
    max-width: 460px;
  }

  .hero-portrait-badge {
    width: 100px;
    height: 100px;
  }

  .badge-num {
    font-size: 1.7rem;
  }

  .hero-strip {
    font-size: 1.15rem;
    gap: 1.5rem;
  }
}

/* ============================================================
   Reduced motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}