/* ============================================
   Portfolio — Material Design 3
   ============================================ */

:root {
  /* Material 3 color roles — light */
  --md-sys-color-primary: #6750a4;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #eaddff;
  --md-sys-color-on-primary-container: #21005d;
  --md-sys-color-secondary: #625b71;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #e8def8;
  --md-sys-color-on-secondary-container: #1d192b;
  --md-sys-color-tertiary: #7d5260;
  --md-sys-color-on-tertiary: #ffffff;
  --md-sys-color-tertiary-container: #ffd8e4;
  --md-sys-color-on-tertiary-container: #31111d;
  --md-sys-color-surface: #fef7ff;
  --md-sys-color-on-surface: #1d1b20;
  --md-sys-color-surface-container: #f3edf7;
  --md-sys-color-surface-container-high: #ece6f0;
  --md-sys-color-on-surface-variant: #49454f;
  --md-sys-color-outline: #79747e;
  --md-sys-color-outline-variant: #cac4d0;
  --md-sys-color-shadow: rgba(0, 0, 0, 0.2);
  --md-sys-color-scrim: rgba(0, 0, 0, 0.32);
  /* IntelliJ IDEA Light: light code block, dark text (distinct from card) */
  --code-bg: #e5dfed;
  --code-fg: #000000;
  --code-keyword: #000080;
  --code-string: #008000;
  --code-comment: #808080;
  --code-number: #0000ff;
  --code-function: #00627a;
  --code-operator: #000000;
  --code-punctuation: #000000;
  --code-property: #008000;
  --code-class-name: #2080c0;
  --code-boolean: #000080;
  --code-attr-name: #795e26;
  --code-builtin: #00627a;
  --code-variable: #000000;
  --code-regex: #008000;
  --theme-switch-duration: 320ms;
  --theme-switch-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="dark"] {
  --md-sys-color-primary: #d0bcff;
  --md-sys-color-on-primary: #381e72;
  --md-sys-color-primary-container: #4f378b;
  --md-sys-color-on-primary-container: #eaddff;
  --md-sys-color-secondary: #ccc2dc;
  --md-sys-color-on-secondary: #332d41;
  --md-sys-color-secondary-container: #4a4458;
  --md-sys-color-on-secondary-container: #e8def8;
  --md-sys-color-tertiary: #efb8c8;
  --md-sys-color-on-tertiary: #492532;
  --md-sys-color-tertiary-container: #633b48;
  --md-sys-color-on-tertiary-container: #ffd8e4;
  --md-sys-color-surface: #141218;
  --md-sys-color-on-surface: #e6e1e5;
  --md-sys-color-surface-container: #211f26;
  --md-sys-color-surface-container-high: #2b2930;
  --md-sys-color-on-surface-variant: #cac4d0;
  --md-sys-color-outline: #938f99;
  --md-sys-color-outline-variant: #49454f;
  --md-sys-color-shadow: rgba(0, 0, 0, 0.4);
  --md-sys-color-scrim: rgba(0, 0, 0, 0.6);
  --code-bg: #211f26;
  --code-fg: #a9b7c6;
  /* Syntax: IntelliJ Darcula */
  --code-keyword: #cc7832;
  --code-string: #6a8759;
  --code-comment: #808080;
  --code-number: #6897bb;
  --code-function: #ffc66d;
  --code-operator: #a9b7c6;
  --code-punctuation: #a9b7c6;
  --code-property: #9876aa;
  --code-class-name: #9876aa;
  --code-boolean: #cc7832;
  --code-attr-name: #a9b7c6;
  --code-builtin: #ffc66d;
  --code-variable: #a9b7c6;
  --code-regex: #6a8759;
}

/* Legacy aliases for compatibility */
:root {
  --color-bg: var(--md-sys-color-surface);
  --color-surface: var(--md-sys-color-surface-container);
  --color-surface-2: var(--md-sys-color-surface-container-high);
  --color-surface-3: var(--md-sys-color-surface-container-high);
  --color-text: var(--md-sys-color-on-surface);
  --color-text-muted: var(--md-sys-color-on-surface-variant);
  --color-primary: var(--md-sys-color-primary);
  --color-primary-container: var(--md-sys-color-primary-container);
  --color-accent: var(--md-sys-color-tertiary);
  --color-outline: var(--md-sys-color-outline-variant);
  --color-border: var(--md-sys-color-outline-variant);
  --color-shadow: var(--md-sys-color-shadow);
  --color-shadow-elevated: var(--md-sys-color-shadow);
  --font-heading: var(--md-sys-font-family);
  --font-body: var(--md-sys-font-family);
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --container-max: 720px;
  --header-height: 64px;
  --header-height-shrunk: 56px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-smooth: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 0.15s;
  --duration-normal: 0.3s;
  --duration-slow: 0.45s;
  --md-sys-font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--md-sys-color-surface);
}

body {
  font-family: var(--md-sys-font-family);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.015em;
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

ul {
  list-style: none;
}

/* ============================================ Loader ============================================ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--md-sys-color-surface);
  transition: opacity var(--duration-slow) var(--ease-out-expo), visibility 0s linear var(--duration-slow);
}

.loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-line {
  width: 120px;
  height: 4px;
  border-radius: 2px;
  background: var(--md-sys-color-surface-container-high);
  overflow: hidden;
}

.loader-line::after {
  content: '';
  display: block;
  width: 40%;
  height: 100%;
  background: var(--md-sys-color-primary);
  border-radius: 2px;
  animation: loader-indeterminate 1.2s var(--ease-in-out-smooth) infinite;
}

@keyframes loader-indeterminate {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

/* ============================================ Parallax (subtle) ============================================ */
.parallax-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.parallax-gradient {
  position: absolute;
  width: 80%;
  height: 60%;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.08;
  will-change: transform;
}

.parallax-gradient-1 {
  top: -20%;
  right: -20%;
  background: var(--md-sys-color-primary);
}

.parallax-gradient-2 {
  bottom: -20%;
  left: -20%;
  background: var(--md-sys-color-tertiary);
}

.parallax-orb {
  position: absolute;
  width: 200px;
  height: 200px;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 50%;
  opacity: 0.3;
  will-change: transform;
}

.parallax-orb-1 { top: 20%; right: 15%; }
.parallax-orb-2 { bottom: 25%; left: 10%; }

@media (prefers-reduced-motion: reduce) {
  .parallax-gradient,
  .parallax-orb {
    display: none;
  }
}

[data-theme="dark"] .parallax-orb,
[data-theme="dark"] .parallax-gradient-2 {
  display: none;
}

[data-theme="dark"] .parallax-gradient-1 {
  opacity: 0.05;
  filter: blur(80px);
}

/* ============================================ Top app bar (Material 3) ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  transition: height var(--duration-normal) var(--ease-out-expo),
    box-shadow var(--duration-normal);
}

.header.scrolled {
  height: var(--header-height-shrunk);
  box-shadow: 0 1px 2px 0 var(--md-sys-color-shadow);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--md-sys-color-on-surface-variant);
  position: relative;
}

.nav-toggle-line + .nav-toggle-line {
  margin-top: 4px;
}

.logo {
  position: relative;
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  background-image: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  background-size: 200% 100%;
  background-position: 0% 50%;
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  transition: transform var(--duration-fast);
}

.logo::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.18em;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  transform: scaleX(0.2);
  opacity: 0;
  transform-origin: left center;
  transition: transform var(--duration-fast), opacity var(--duration-fast);
}

.logo:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.logo:hover::after,
.logo:focus-visible::after {
  transform: scaleX(1);
  opacity: 1;
}

.logo:focus-visible {
  outline: none;
  transform: translateY(-1px);
}

@media (prefers-reduced-motion: reduce) {
  .logo {
    transition: none;
  }

  .logo:hover,
  .logo:focus-visible {
    transform: none;
  }

  .logo::after {
    transition: none;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 10px 12px;
  border-radius: var(--radius-full);
  color: var(--md-sys-color-on-surface-variant);
  transition: background var(--duration-fast), color var(--duration-fast);
}

.nav-link:hover {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
}

/* M3 Icon button */
.theme-toggle {
  position: relative;
  width: 56px;
  height: 32px;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-full);
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow:
    inset 0 1px 2px color-mix(in srgb, var(--md-sys-color-shadow) 42%, transparent),
    inset 0 -1px 1px color-mix(in srgb, var(--md-sys-color-on-surface) 10%, transparent);
  transition: background var(--duration-fast), color var(--duration-fast), border-color var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  box-shadow: 0 1px 3px var(--md-sys-color-shadow);
  transform: translateX(0);
  transition: transform var(--duration-fast) var(--ease-in-out-smooth), background var(--duration-fast) var(--ease-in-out-smooth);
  z-index: 1;
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(24px);
}

.theme-toggle:hover {
  background: color-mix(in srgb, var(--md-sys-color-surface-container) 82%, var(--md-sys-color-primary-container) 18%);
  border-color: color-mix(in srgb, var(--md-sys-color-primary) 36%, var(--md-sys-color-outline-variant));
  color: var(--md-sys-color-on-surface);
  transform: none;
  box-shadow:
    inset 0 2px 4px color-mix(in srgb, var(--md-sys-color-shadow) 46%, transparent),
    inset 0 -1px 1px color-mix(in srgb, var(--md-sys-color-on-surface) 12%, transparent),
    0 0 0 1px color-mix(in srgb, var(--md-sys-color-primary) 18%, transparent),
    0 4px 12px color-mix(in srgb, var(--md-sys-color-primary) 22%, transparent);
}

.theme-toggle:hover::before {
  transform: translateX(0) scale(1.04);
  box-shadow:
    0 2px 6px color-mix(in srgb, var(--md-sys-color-shadow) 55%, transparent),
    0 0 0 2px color-mix(in srgb, var(--md-sys-color-primary) 20%, transparent);
}

[data-theme="dark"] .theme-toggle:hover::before {
  transform: translateX(24px) scale(1.04);
}

.theme-toggle:hover .icon-sun,
.theme-toggle:hover .icon-moon {
  opacity: 0.65;
}

.theme-toggle svg {
  position: absolute;
  top: 50%;
  width: 15px;
  height: 15px;
  transform: translateY(-50%);
  z-index: 2;
  transition: opacity var(--duration-fast), color var(--duration-fast), transform var(--duration-fast);
}

.theme-toggle .icon-sun {
  left: 7px;
  opacity: 0.45;
  color: var(--md-sys-color-on-surface-variant);
}

.theme-toggle .icon-moon {
  right: 7px;
  opacity: 0.45;
  color: var(--md-sys-color-on-surface-variant);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 1;
  color: var(--md-sys-color-on-primary);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 1;
  color: var(--md-sys-color-on-primary);
}

.theme-toggle:focus-visible {
  outline: none;
  box-shadow:
    inset 0 1px 2px color-mix(in srgb, var(--md-sys-color-shadow) 42%, transparent),
    inset 0 -1px 1px color-mix(in srgb, var(--md-sys-color-on-surface) 10%, transparent),
    0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary) 28%, transparent);
}

html.theme-switching,
html.theme-switching * {
  transition:
    background-color var(--theme-switch-duration) var(--theme-switch-ease),
    border-color var(--theme-switch-duration) var(--theme-switch-ease),
    color var(--theme-switch-duration) var(--theme-switch-ease),
    box-shadow var(--theme-switch-duration) var(--theme-switch-ease),
    fill var(--theme-switch-duration) var(--theme-switch-ease),
    stroke var(--theme-switch-duration) var(--theme-switch-ease) !important;
}

@media (max-width: 640px) {
  .nav-wrap {
    gap: 4px;
  }

  .theme-toggle {
    margin-left: 8px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    padding: 8px 16px 12px;
    background: var(--md-sys-color-surface-container);
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: 0 4px 12px var(--md-sys-color-shadow);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity var(--duration-fast), transform var(--duration-fast);
  }

  .header.nav-open .nav {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    padding: 8px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle,
  .theme-toggle::before,
  .theme-toggle svg,
  html.theme-switching,
  html.theme-switching * {
    transition: none !important;
  }
}

/* ============================================ Main ============================================ */
main {
  padding-top: var(--header-height);
  min-height: 100vh;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Give anchored sections space below the fixed header when scrolled into view */
.hero,
.skills-section,
.impact-section,
.posts-section,
.about-section {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

/* ============================================ Hero — M3 display/headline ============================================ */
.hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
}

.hero-inner {
  display: flex;
  align-items: flex-start;
}

.hero-content {
  max-width: 520px;
}

.hero-overline {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  overflow: hidden;
  color: var(--md-sys-color-on-surface);
  position: relative;
  padding-bottom: 0.35em;
}

.hero-title-line { display: block; }
.hero-title-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.4em);
  animation: heroWordReveal var(--duration-normal) var(--ease-out-expo) forwards;
}

.hero-title-word + .hero-title-word {
  margin-left: 0.25em;
}

.hero-title::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
}

.hero-title-word:nth-child(1) { animation-delay: 0.05s; }
.hero-title-word:nth-child(2) { animation-delay: 0.15s; }
.hero-title-word:nth-child(3) { animation-delay: 0.25s; }

@keyframes heroWordReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

.hero-line {
  width: 64px;
  height: 4px;
  margin: var(--space-xl) 0;
  border-radius: 2px;
  background: var(--md-sys-color-primary-container);
  overflow: hidden;
}

.hero-line-inner {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--md-sys-color-primary);
  animation: shimmer 2s var(--ease-in-out-smooth) 1s infinite;
}

@keyframes shimmer {
  0%, 100% { transform: scaleX(0.5); opacity: 0.6; }
  50% { transform: scaleX(1); opacity: 1; }
}

.hero-subtitle {
  font-size: 1rem;
  font-weight: 400;
  color: var(--md-sys-color-on-surface-variant);
  max-width: 360px;
}

.hero-value {
  font-size: 1rem;
  font-weight: 400;
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: var(--space-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: var(--radius-full);
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--duration-fast),
    color var(--duration-fast),
    border-color var(--duration-fast),
    box-shadow var(--duration-fast),
    transform var(--duration-fast);
}

.hero-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--md-sys-color-shadow) 40%, transparent);
  text-decoration: none;
}

.hero-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px color-mix(in srgb, var(--md-sys-color-shadow) 32%, transparent);
}

.hero-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--md-sys-color-primary) 28%, transparent);
}

.hero-btn-primary {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.hero-btn-primary:hover {
  background: color-mix(in srgb, var(--md-sys-color-primary) 90%, black 10%);
  color: var(--md-sys-color-on-primary);
}

.hero-btn-tonal {
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.hero-btn-tonal:hover {
  background: var(--md-sys-color-secondary);
  color: var(--md-sys-color-on-secondary);
}

.hero-btn-outline {
  background: transparent;
  color: var(--md-sys-color-primary);
  border: 2px solid var(--md-sys-color-primary);
}

.hero-btn-outline:hover {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
}

.hero-btn-ghost {
  background: transparent;
  color: var(--md-sys-color-primary);
}

.hero-btn-ghost:hover {
  background: var(--md-sys-color-surface-container-high);
}

@media (prefers-reduced-motion: reduce) {
  .hero-btn {
    transition: background var(--duration-fast), color var(--duration-fast), border-color var(--duration-fast);
  }

  .hero-btn:hover,
  .hero-btn:active {
    transform: none;
    box-shadow: none;
  }
}

/* ============================================ Reveals ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out-expo), transform var(--duration-slow) var(--ease-out-expo);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================ Section title — M3 headline, bold & styled ============================================ */
.section-title {
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-2xl);
  color: var(--md-sys-color-on-surface);
  position: relative;
  padding-left: 0;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.35em;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
}

[data-theme="dark"] .section-title::before {
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  opacity: 0.9;
}

/* ============================================ Posts — M3 filled cards ============================================ */
.posts-section {
  padding: var(--space-3xl) 0;
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.post-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out-expo), transform var(--duration-slow) var(--ease-out-expo);
  width: 100%;
  max-width: 760px;
  margin-inline: auto;
}

.post-card.revealed {
  opacity: 1;
  transform: translateY(0);
}

.post-card:nth-child(1).revealed { transition-delay: 0.05s; }
.post-card:nth-child(2).revealed { transition-delay: 0.1s; }
.post-card:nth-child(3).revealed { transition-delay: 0.15s; }
.post-card:nth-child(4).revealed { transition-delay: 0.2s; }
.post-card:nth-child(5).revealed { transition-delay: 0.25s; }

.post-card-link {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  position: relative;
  transition: background var(--duration-normal), box-shadow var(--duration-normal), transform var(--duration-normal);
  box-shadow: none;
}

.post-card-link:hover {
  background: var(--md-sys-color-surface-container-high);
  box-shadow: 0 2px 6px 2px var(--md-sys-color-shadow);
  transform: translateY(-2px);
  text-decoration: none;
}

.post-card-number {
  display: none;
}

.post-card-content {
  flex: 1;
  min-width: 0;
}

.post-card-title {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 4px;
  color: var(--md-sys-color-on-surface);
}

.post-card-excerpt {
  display: none;
}

.post-card-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-surface-variant);
}

.post-card-date time {
  font-variant-numeric: tabular-nums;
}

.post-card-date-line {
  display: inline-block;
  width: 0;
  height: 1px;
  background: var(--md-sys-color-primary);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

.post-card-link:hover .post-card-date-line {
  width: 16px;
}

.post-card-arrow {
  flex-shrink: 0;
  font-size: 1.25rem;
  color: var(--md-sys-color-primary);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--duration-normal), transform var(--duration-normal);
}

.post-card-link:hover .post-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* Pagination below posts */
.posts-pagination {
  margin-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.875rem;
}

.pagination-pages {
  display: flex;
  gap: 8px;
}

.pagination-btn,
.pagination-page {
  border: none;
  border-radius: var(--radius-full);
  padding: 6px 12px;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--duration-fast), color var(--duration-fast), opacity var(--duration-fast);
}

.pagination-btn[disabled] {
  opacity: 0.4;
  cursor: default;
}

.pagination-page.is-active {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.pagination-btn:hover:not([disabled]),
.pagination-page:hover {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

/* ============================================ About — M3 body ============================================ */
.about-section {
  padding: var(--space-3xl) 0;
}

.about-content {
  max-width: 600px;
}

.about-intro {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--space-lg);
}

.about-text p {
  margin-bottom: var(--space-lg);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface);
}

/* Focus areas highlighted by text color — high contrast for readability */
.about-tag {
  font-weight: 600;
  color: var(--md-sys-color-on-primary-container);
}

/* LinkedIn & Resume link cards */
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: var(--space-lg);
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-lg);
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--duration-fast), color var(--duration-fast), box-shadow var(--duration-fast), border-color var(--duration-fast), transform var(--duration-fast);
}

.about-link:hover {
  background: var(--md-sys-color-surface-container-high);
  box-shadow: 0 2px 8px var(--md-sys-color-shadow);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
}

.about-link-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-link-icon svg {
  display: block;
}

/* Circle icon container — background and icon use same hover transition */
.about-link-icon-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  transition: background var(--duration-fast), color var(--duration-fast);
}

/* LinkedIn circle — brand color; hover softens both background and icon together */
.about-link-linkedin .about-link-icon-circle {
  background: #0A66C2;
  color: rgba(255, 255, 255, 0.95);
}

.about-link-linkedin:hover .about-link-icon-circle {
  background: #004182;
  color: rgba(255, 255, 255, 0.82);
}

/* PDF / Resume circle — same idea: hover darkens background and softens icon */
.about-link-resume .about-link-icon-circle {
  background: var(--md-sys-color-tertiary-container);
  color: var(--md-sys-color-on-tertiary-container);
}

.about-link-resume:hover .about-link-icon-circle {
  background: var(--md-sys-color-tertiary);
  color: var(--md-sys-color-on-tertiary);
}

.about-link-label {
  flex: 1;
  min-width: 0;
}

.about-link-arrow {
  position: relative;
  display: inline-block;
  width: 12px;
  height: 12px;
  font-size: 0;
  line-height: 0;
  color: currentColor;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--duration-fast), transform var(--duration-fast);
}

.about-link-arrow::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  box-sizing: border-box;
  width: 8px;
  height: 8px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: translate(-50%, -50%) rotate(45deg);
}

.about-link:hover .about-link-arrow {
  opacity: 1;
  transform: translateX(0);
}

.about-text a:not(.about-link) {
  color: var(--md-sys-color-primary);
}

.about-text a:not(.about-link):hover {
  text-decoration: underline;
}

/* Skills / Impact / Posts / About paddings */
.skills-section,
.impact-section,
.posts-section,
.about-section {
  padding: var(--space-4xl) 0 var(--space-3xl);
}

/* Skills grid — card per skill with name + YOE */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.skill-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.skill-card:hover {
  background: var(--md-sys-color-surface-container-high);
}

.skill-card-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--md-sys-color-on-surface);
  line-height: 1.3;
}

.skill-card-yoe {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--md-sys-color-on-surface-variant);
}

@media (max-width: 480px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .skill-card {
    padding: 14px 16px;
  }

  .skill-card-name {
    font-size: 0.95rem;
  }

  .skill-card-yoe {
    font-size: 0.75rem;
  }
}

.impact-list {
  list-style: none;
  padding-left: 0;
}

.impact-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: var(--md-sys-color-on-surface);
}

.impact-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--md-sys-color-primary);
}

/* ============================================ Footer — M3 surface container ============================================ */
.footer {
  padding: var(--space-3xl) 24px;
  margin-top: var(--space-4xl);
  background: var(--md-sys-color-surface-container);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.footer::before {
  display: none;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.footer-email {
  display: block;
  font-size: 1rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--space-lg);
}

.footer-email:hover {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

.footer-social {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
  margin-bottom: var(--space-md);
}

.footer-rss-wrap {
  margin-bottom: var(--space-lg);
}

.footer-rss {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  padding: 10px 16px;
  border-radius: var(--radius-full);
  background: var(--md-sys-color-surface-container-high);
  transition: background var(--duration-fast), color var(--duration-fast);
}

.footer-rss:hover {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  text-decoration: none;
}

.footer-rss svg {
  width: 20px;
  height: 20px;
}

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  padding: 8px 0;
}

.footer-link:hover {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--md-sys-color-on-surface-variant);
}

/* ============================================ Cursor trail ============================================ */
.cursor-trail {
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--md-sys-color-primary);
  opacity: 0.25;
  transform: translate(-50%, -50%);
}

@media (hover: none) or (pointer: coarse) {
  .cursor-trail { display: none; }
}

/* Back to top FAB */
.back-to-top {
  position: fixed;
  right: 16px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  border: none;
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
  color: var(--md-sys-color-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px var(--md-sys-color-shadow);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--duration-fast), transform var(--duration-fast), background var(--duration-fast), color var(--duration-fast);
  z-index: 90;
}

.back-to-top-icon {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.back-to-top-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.back-to-top,
[data-theme="dark"] .back-to-top {
  background: linear-gradient(90deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
}

.back-to-top:hover {
  background: linear-gradient(90deg, var(--md-sys-color-tertiary), var(--md-sys-color-primary));
  color: var(--md-sys-color-on-primary);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 640px) {
  .back-to-top {
    right: 12px;
    bottom: 16px;
    width: 54px;
    height: 54px;
  }

  .back-to-top-icon {
    width: 20px;
    height: 20px;
  }
}

/* ============================================ Responsive ============================================ */
@media (max-width: 640px) {
  .header-inner { padding: 0 16px; }
  .hero { min-height: 60vh; padding: var(--space-3xl) 16px; }
  .container { padding: 0 16px; }
  .post-card-link {
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 8px;
  }
  .post-card-arrow {
    position: absolute;
    top: 16px;
    right: 16px;
  }
  .footer { padding: var(--space-2xl) 16px; }
}