/* ==========================================================================
   Thái Thị Thu Hằng — Business Analyst
   Bản dựng lại tĩnh của thuhang.io.vn (không cần build, không Tailwind)
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --color-paper: oklch(96.8% 0.008 92);
  --color-paper-2: oklch(93.8% 0.01 92);
  --color-ink: oklch(20% 0.02 55);
  --color-ink-soft: oklch(40% 0.016 55);
  --color-accent: oklch(46% 0.085 152);
  --color-accent-soft: oklch(46% 0.085 152 / 0.14);
  --color-rule: oklch(20% 0.02 55 / 0.12);

  --ease-out-expo: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out-soft: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);

  --font-display: "Fraunces Variable", "Fraunces", Georgia, "Times New Roman", serif;
  --font-sans: "Source Sans 3 Variable", "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

html.dark {
  color-scheme: dark;
  --color-paper: oklch(17% 0.014 55);
  --color-paper-2: oklch(21% 0.016 55);
  --color-ink: oklch(94% 0.008 92);
  --color-ink-soft: oklch(72% 0.012 92);
  --color-accent: oklch(74% 0.095 152);
  --color-accent-soft: oklch(74% 0.095 152 / 0.18);
  --color-rule: oklch(94% 0.008 92 / 0.12);
}

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

html {
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  color-scheme: light;
  scroll-padding-top: 5rem;
  overflow-x: clip;
}
html.dark { color-scheme: dark; }

h1, h2, h3, h4, h5, h6 { font-size: inherit; font-weight: inherit; }
a { color: inherit; text-decoration: inherit; }
ol, ul, menu { list-style: none; }
img, svg { display: block; vertical-align: middle; }
img { max-width: 100%; height: auto; }
button {
  font: inherit;
  letter-spacing: inherit;
  color: inherit;
  background-color: transparent;
  border-radius: 0;
  appearance: button;
}
[hidden]:where(:not([hidden="until-found"])) { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@media (width >= 768px) {
  html { scroll-padding-top: 5.5rem; }
}

#top, #about, #work, #experience, #skills, #contact { scroll-margin-top: 5rem; }
@media (width >= 768px) {
  #top, #about, #work, #experience, #skills, #contact { scroll-margin-top: 5.5rem; }
}

/* ---------- Nền giấy + hạt nhiễu ---------- */
body {
  position: relative;
  z-index: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-paper);
  min-height: 100dvh;
  color: var(--color-ink);
  font-family: var(--font-sans);
  background-image:
    radial-gradient(ellipse 90% 55% at 0% -5%, var(--color-accent-soft), transparent 52%),
    radial-gradient(ellipse 55% 40% at 100% 8%, oklch(94% 0.01 92 / 0.7), transparent 48%);
  background-attachment: fixed;
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: clip;
}

html.dark body {
  background-image:
    radial-gradient(ellipse 80% 50% at 5% -8%, var(--color-accent-soft), transparent 55%),
    radial-gradient(ellipse 45% 35% at 100% 0%, oklch(22% 0.016 55 / 0.85), transparent 50%);
}

body::before {
  content: "";
  pointer-events: none;
  z-index: 50;
  opacity: 0.045;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  position: fixed;
  inset: 0;
}
html.dark body::before { opacity: 0.07; mix-blend-mode: soft-light; }

::selection { background: var(--color-accent-soft); color: var(--color-ink); }
h1, h2, h3 { text-wrap: balance; }
p, dd, li, figcaption { text-wrap: pretty; }

:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
main:focus, main:focus-visible { outline: none; }

/* ---------- Typography helpers ---------- */
.font-display {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-style: normal;
}

.label {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  font-weight: 500;
}

.c-soft { color: var(--color-ink-soft); }
.sep { margin-inline: 0.5rem; color: var(--color-rule); }

/* ---------- Layout container ---------- */
.letter {
  box-sizing: border-box;
  width: 100%;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
@media (width >= 768px) {
  .letter { max-width: 56rem; padding-left: 1.75rem; padding-right: 1.75rem; }
}
@media (width >= 1100px) {
  .letter { max-width: 68rem; padding-left: 2.5rem; padding-right: 2.5rem; }
}
@media (width >= 1440px) {
  .letter { max-width: 72rem; }
}

.page {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  width: 100%;
}

.site-main {
  width: 100%;
  flex: 1;
  padding-top: 1.5rem;
  padding-bottom: max(4rem, 38vh);
}
@media (width >= 48rem) {
  .site-main { padding-top: 4rem; padding-bottom: max(7rem, 45vh); }
}

.site-header,
.site-footer { width: 100%; max-width: none; margin-left: 0; margin-right: 0; }

.section-space { margin-bottom: 4rem; }
@media (width >= 768px) {
  .section-space { margin-bottom: 9.5rem; }
}

/* ---------- Hiện dần khi cuộn ---------- */
.reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
    transform: translateY(16px);
  }
  .reveal.is-in { opacity: 1; transform: translateY(0); }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--color-rule);
  background-color: var(--color-paper);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
@supports (color: color-mix(in lab, red, red)) {
  .site-header { background-color: color-mix(in oklch, var(--color-paper) 86%, transparent); }
}

.nav {
  display: flex;
  height: 3.5rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.875rem;
}
@media (width >= 48rem) {
  .nav { height: 4rem; padding-block: 1rem; }
}

.brand {
  font-size: 1.25rem;
  line-height: 1.4;
  letter-spacing: -0.025em;
  color: var(--color-ink);
  text-decoration: none;
}

.nav-actions { display: flex; align-items: center; gap: 1rem; }
@media (width >= 40rem) {
  .nav-actions { gap: 1.5rem; }
}

.nav-links { display: none; align-items: center; gap: 1.25rem; }
@media (width >= 48rem) {
  .nav-links { display: flex; gap: 1.75rem; }
}

.nav-a {
  color: var(--color-ink-soft);
  transition: color 0.3s var(--ease-out-soft), border-color 0.3s var(--ease-out-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 0.2rem;
  text-decoration: none;
}
.nav-a:hover,
.nav-a:focus-visible { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.nav-a[aria-current="location"] { color: var(--color-ink); border-bottom-color: var(--color-accent); }

/* Nút sáng / tối */
.theme-toggle {
  cursor: pointer;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--color-ink-soft);
  transition: color 0.15s var(--ease-default), background-color 0.15s var(--ease-default),
    border-color 0.15s var(--ease-default);
  justify-content: center;
  align-items: center;
  width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
}
@media (hover: hover) {
  .theme-toggle:hover { color: var(--color-accent); }
}
.theme-toggle:active { scale: 0.97; }
.theme-toggle .theme-icon { line-height: 0; display: none; }
.theme-toggle .theme-icon svg { width: 1.15rem; height: 1.15rem; display: block; }
html:not(.dark) .theme-toggle .theme-icon-moon,
html.dark .theme-toggle .theme-icon-sun { display: block; }

/* Nút hamburger */
.menu-toggle {
  position: relative;
  display: flex;
  height: 2.5rem;
  width: 2.5rem;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  padding: 0;
  transition: transform 0.16s var(--ease-out-expo);
}
.menu-toggle:active { transform: scale(0.97); }
@media (width >= 48rem) {
  .menu-toggle { display: none; }
}
.menu-toggle:focus-visible,
.theme-toggle:focus-visible { outline-offset: 4px; }

html.menu-open { overflow: hidden; }
.menu-toggle-bars { width: 1.25rem; height: 0.75rem; display: block; position: relative; }
.menu-bar {
  background: var(--color-ink);
  width: 100%;
  height: 1.5px;
  transition: transform 0.35s var(--ease-out-soft);
  display: block;
  position: absolute;
  left: 0;
}
.menu-bar-1 { top: 0.15rem; }
.menu-bar-2 { top: 0.55rem; }
html.menu-open .menu-bar-1 { transform: translateY(0.2rem) rotate(45deg); }
html.menu-open .menu-bar-2 { transform: translateY(-0.2rem) rotate(-45deg); }

/* Menu trượt trên điện thoại */
.menu-backdrop {
  z-index: 45;
  background: var(--color-ink);
  position: fixed;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.32s var(--ease-out-soft);
}
@supports (color: color-mix(in lab, red, red)) {
  .menu-backdrop { background: color-mix(in oklch, var(--color-ink) 28%, transparent); }
}
.menu-backdrop.is-open { opacity: 1; pointer-events: auto; }

.mobile-drawer {
  z-index: 50;
  background: var(--color-paper);
  width: min(100vw - 3rem, 20rem);
  height: 100dvh;
  position: fixed;
  top: 0;
  right: 0;
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-left: 1px solid var(--color-rule);
  opacity: 0.96;
  pointer-events: none;
  transition: transform 0.38s var(--ease-out-soft), opacity 0.38s var(--ease-out-soft);
  transform: translate(100%);
}
@supports (color: color-mix(in lab, red, red)) {
  .mobile-drawer { background: color-mix(in oklch, var(--color-paper) 92%, transparent); }
}
.mobile-drawer.is-open { opacity: 1; pointer-events: auto; transform: translate(0); }

.mobile-drawer-inner {
  flex-direction: column;
  height: 100%;
  padding: 5.5rem 1.5rem 2rem;
  display: flex;
}
.drawer-label { margin-bottom: 2rem; color: var(--color-ink-soft); }
.drawer-nav { display: flex; flex-direction: column; gap: 0.25rem; }

.drawer-link {
  font-size: 2.2rem;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-rule);
  opacity: 0;
  transition: opacity 0.22s var(--ease-out-soft), transform 0.22s var(--ease-out-soft),
    color 0.3s var(--ease-out-soft), border-color 0.3s var(--ease-out-soft);
  padding: 0.65rem 0;
  transition-delay: 0s;
  transform: translateY(12px);
}
.mobile-drawer.is-open .drawer-link {
  opacity: 1;
  transition-duration: 0.4s, 0.4s, 0.2s, 0.2s;
  transition-delay: calc(var(--i, 0) * 50ms + 60ms);
  transform: translateY(0);
}
.drawer-link:hover,
.drawer-link:focus-visible { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.drawer-link[aria-current="location"] { color: var(--color-accent); border-bottom-color: var(--color-accent); }

@media (width >= 768px) {
  .menu-backdrop, .mobile-drawer { display: none !important; }
}

/* Skip link */
.skip-link {
  z-index: 60;
  background: var(--color-ink);
  color: var(--color-paper);
  box-shadow: 0 12px 30px -18px var(--color-ink);
  padding: 0.7rem 1.1rem;
  text-decoration: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  transition: transform 0.28s var(--ease-out-soft);
  transform: translateY(calc(-100% - 1rem));
}
@supports (color: color-mix(in lab, red, red)) {
  .skip-link { box-shadow: 0 12px 30px -18px color-mix(in oklch, var(--color-ink) 60%, transparent); }
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- Hero ---------- */
.hero-grid { align-items: end; gap: 1.75rem 2rem; display: grid; }
@media (width >= 900px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(14rem, 0.85fr);
    align-items: center;
    gap: 2.75rem 3.25rem;
    min-height: min(70vh, 38rem);
  }
}
.hero-copy { min-width: 0; }

.hero-eyebrow { margin-bottom: 1.25rem; color: var(--color-accent); }

.hero-name {
  max-width: 14ch;
  font-size: clamp(2.85rem, 12vw, 5.85rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  text-wrap: balance;
  color: var(--color-ink);
}

.hero-tagline {
  margin-top: 1.75rem;
  max-width: min(34ch, 100%);
  font-size: 1.2rem;
  line-height: 1.375;
  letter-spacing: -0.015em;
  color: var(--color-ink);
}

.hero-actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 1.5rem;
  row-gap: 0.75rem;
}

@media (width >= 48rem) {
  .hero-eyebrow { margin-bottom: 1.5rem; }
  .hero-name { line-height: 0.96; }
  .hero-tagline { margin-top: 2.25rem; font-size: 1.55rem; line-height: 1.25; }
  .hero-actions { margin-top: 2.25rem; }
}

.hero-visual { justify-self: start; width: min(100%, 16rem); margin: 0; position: relative; }
@media (width >= 900px) {
  .hero-visual { justify-self: end; width: min(100%, 20rem); }
}

.hero-portrait {
  aspect-ratio: 3 / 4;
  background: var(--color-paper-2);
  box-shadow: 0 1px 0 var(--color-ink), 0 22px 48px -26px var(--color-ink), 0 8px 20px -16px var(--color-accent);
  position: relative;
  overflow: hidden;
}
@supports (color: color-mix(in lab, red, red)) {
  .hero-portrait {
    box-shadow:
      0 1px 0 color-mix(in oklch, var(--color-ink) 6%, transparent),
      0 22px 48px -26px color-mix(in oklch, var(--color-ink) 28%, transparent),
      0 8px 20px -16px color-mix(in oklch, var(--color-accent) 18%, transparent);
  }
}

/* Vạch xanh chạy dọc mép trái ảnh khi hero xuất hiện */
.hero-portrait::before {
  content: "";
  z-index: 2;
  background: var(--color-accent);
  opacity: 0.85;
  transform-origin: top;
  width: 2px;
  transition: transform 0.95s var(--ease-out-expo) 0.18s;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  transform: scaleY(0);
}
.hero.is-in .hero-portrait::before { transform: scaleY(1); }

.hero-portrait::after {
  content: "";
  z-index: 2;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px var(--color-rule);
  position: absolute;
  inset: 0;
}

/* Ảnh thu nhỏ nhẹ từ 1.05 về 1 */
.hero-portrait-img {
  object-fit: cover;
  object-position: center 12%;
  width: 100%;
  height: 100%;
  transition: transform 1.2s var(--ease-out-expo);
  display: block;
  transform: scale(1.05);
}
.hero.is-in .hero-portrait-img { transform: scale(1); }

.hero-visual-caption {
  color: var(--color-ink-soft);
  opacity: 0;
  transition: opacity 0.6s var(--ease-out-expo) 0.32s, transform 0.6s var(--ease-out-expo) 0.32s;
  margin-top: 0.85rem;
  transform: translateY(8px);
}
.hero.is-in .hero-visual-caption { opacity: 1; transform: translateY(0); }

@media (width <= 899px) {
  .hero-visual { order: -1; justify-self: start; width: min(72vw, 15.5rem); }
  .hero-visual-caption { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-portrait::before { transition: none; transform: scaleY(1); }
  .hero-portrait-img { transition: none; transform: none; }
  .hero-visual-caption { opacity: 1; transition: opacity 0.2s; transform: none; }
}

/* ---------- Nút & liên kết ---------- */
.cta-solid {
  background: var(--color-ink);
  color: var(--color-paper);
  letter-spacing: 0.01em;
  box-shadow: 0 10px 28px -18px var(--color-ink);
  justify-content: center;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.45rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  transition: background-color 0.35s var(--ease-out-soft), transform 0.2s var(--ease-out-soft),
    box-shadow 0.35s var(--ease-out-soft);
}
@supports (color: color-mix(in lab, red, red)) {
  .cta-solid { box-shadow: 0 10px 28px -18px color-mix(in oklch, var(--color-ink) 55%, transparent); }
}
.cta-solid::after {
  content: "→";
  opacity: 0.72;
  transition: transform 0.35s var(--ease-out-expo), opacity 0.35s var(--ease-out-soft);
  font-size: 0.95em;
}
.cta-solid:hover {
  background: var(--color-accent);
  box-shadow: 0 14px 32px -16px var(--color-accent);
}
@supports (color: color-mix(in lab, red, red)) {
  .cta-solid:hover { box-shadow: 0 14px 32px -16px color-mix(in oklch, var(--color-accent) 45%, transparent); }
}
.cta-solid:hover::after { opacity: 1; transform: translate(3px); }
.cta-solid:active { transform: scale(0.98); }

.cta-solid-responsive { width: 100%; }
@media (width >= 480px) {
  .cta-solid-responsive { width: auto; }
}

.cta-text {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-rule);
  transition: color 0.3s var(--ease-out-soft), border-color 0.3s var(--ease-out-soft),
    transform 0.16s var(--ease-out-expo);
  align-items: baseline;
  gap: 0.4rem;
  padding-bottom: 0.2rem;
  text-decoration: none;
  display: inline-flex;
}
.cta-text:hover { color: var(--color-accent); border-color: var(--color-accent); }
.cta-text:active { transform: scale(0.97); }
.cta-text-break { overflow-wrap: anywhere; word-break: break-word; max-width: 100%; }

.to-top {
  color: var(--color-ink-soft);
  transition: color 0.3s var(--ease-out-soft), transform 0.16s var(--ease-out-expo);
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  display: inline-flex;
}
.to-top::after { content: "↑"; transition: transform 0.35s var(--ease-out-expo); }
.to-top:hover,
.to-top:focus-visible { color: var(--color-accent); }
.to-top:hover::after { transform: translateY(-3px); }
.to-top:active { transform: scale(0.97); }

/* ---------- Tiêu đề section ---------- */
.section-title {
  font-size: clamp(2.05rem, 5.25vw, 3rem);
  letter-spacing: -0.02em;
}
.section-title--spaced { margin-bottom: 2rem; }
@media (width >= 48rem) {
  .section-title--spaced { margin-bottom: 2.5rem; }
}

/* Quầng sáng xanh nhạt khi rê chuột vào section */
.section-atmosphere { position: relative; }
.section-atmosphere::before {
  content: "";
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(ellipse 60% 40% at 0% 0%, var(--color-accent-soft), transparent 70%);
  opacity: 0;
  transition: opacity 0.7s var(--ease-out-soft);
  border-radius: 1rem;
  position: absolute;
  inset: -4rem -2rem;
}
.section-atmosphere:hover::before,
.section-atmosphere:focus-within::before { opacity: 1; }

/* ---------- Về tôi ---------- */
.pull {
  border-left: 2px solid var(--color-accent);
  padding-left: 1.25rem;
  max-width: min(46ch, 100%);
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-ink);
}
@media (width >= 48rem) {
  .pull { font-size: 1.4rem; }
}

/* ---------- Công việc ---------- */
.work-intro {
  margin-top: 0.75rem;
  max-width: min(40ch, 100%);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-ink-soft);
}
@media (width >= 48rem) {
  .work-intro { margin-top: 1rem; font-size: 1.125rem; line-height: calc(1.75 / 1.125); }
}

.work-list { margin-top: 2rem; padding: 0; }
@media (width >= 48rem) {
  .work-list { margin-top: 3rem; }
}

.work-item {
  border-top: 1px solid var(--color-rule);
  opacity: 1;
  background-color: transparent;
  border-left: 2px solid transparent;
  margin-left: -2px;
  padding: 1.5rem 0.75rem 1.5rem 0.85rem;
  transition: opacity 0.2s, background-color 0.2s, border-color 0.2s;
}
.work-item:last-child { border-bottom: 1px solid var(--color-rule); }
@media (width >= 768px) {
  .work-item { padding: 2.25rem 1.25rem 2.25rem 1.15rem; }
  .work-item-offset { padding-left: 2.75rem; }
}
.work-item:focus-within {
  opacity: 1;
  background-color: var(--color-accent-soft);
  border-left-color: var(--color-accent);
}
/* Rê chuột vào một case: các case còn lại mờ đi */
@media (hover: hover) and (pointer: fine) {
  .work-list:hover .work-item:not(:hover):not(:focus-within) { opacity: 0.4; }
  .work-item:hover {
    opacity: 1;
    background-color: var(--color-accent-soft);
    border-left-color: var(--color-accent);
  }
}

.work-case { gap: 1rem 1.25rem; display: grid; }
@media (width >= 768px) {
  .work-case { grid-template-columns: 4.5rem minmax(0, 1fr); gap: 0.5rem 1.75rem; }
  .work-case-mark { grid-column: 2; }
}
@media (width >= 1100px) {
  .work-case { grid-template-columns: 4.75rem minmax(0, 1fr) 7.5rem; align-items: start; gap: 0.75rem 2rem; }
  .work-case-mark { grid-column: auto; margin-top: 0.35rem; }
}
.work-case-body { min-width: 0; }

.work-case-index {
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  font-size: 1.85rem;
  line-height: 1;
}
@media (width >= 768px) {
  .work-case-index { padding-top: 0.2rem; font-size: 2.25rem; }
}

.work-case-title { letter-spacing: -0.02em; font-size: 1.45rem; line-height: 1.15; }
@media (width >= 768px) {
  .work-case-title { font-size: 1.9rem; }
}

.work-case-meta { color: var(--color-ink-soft); margin: 0.35rem 0 0; font-size: 0.98rem; }
.work-case-meta-sep { color: var(--color-rule); margin: 0 0.35rem; }

.work-case-steps { gap: 0.85rem; margin: 1.15rem 0 0; display: grid; }
@media (width >= 768px) {
  .work-case-steps { gap: 1rem; margin-top: 1.35rem; }
}

.work-step { gap: 0.3rem; max-width: 52ch; display: grid; }
.work-step dt { color: var(--color-accent); }
.work-step dd { color: var(--color-ink); margin: 0; font-size: 1.05rem; line-height: 1.55; }
.work-step-result dd { font-weight: 500; }

.work-case-note { color: var(--color-ink-soft); margin: 0.85rem 0 0; font-size: 0.98rem; }
.work-case-tags { color: var(--color-ink-soft); margin: 0.9rem 0 0; }

/* Ký hiệu hình học nhỏ cạnh mỗi case */
.mark {
  border-top: 1px solid var(--color-rule);
  width: 100%;
  height: 3.5rem;
  margin-top: 1rem;
  position: relative;
  overflow: hidden;
}
@media (hover: hover) and (pointer: fine) {
  .work-item:hover .mark::before,
  .work-item:hover .mark::after,
  .work-item:focus-within .mark::before,
  .work-item:focus-within .mark::after { transform: translateY(-2px); }
  .mark::before,
  .mark::after { transition: transform 0.45s var(--ease-out-expo); }
}
@media (width >= 768px) {
  .mark { height: 4.5rem; margin-top: 1.25rem; }
}
.mark::before,
.mark::after { content: ""; background: var(--color-accent); opacity: 0.55; position: absolute; }

.mark-orbit::before {
  border: 1px solid var(--color-accent);
  background: 0 0;
  border-radius: 50%;
  width: 3.25rem;
  height: 3.25rem;
  top: 0.65rem;
  left: 0;
}
.mark-orbit::after { border-radius: 50%; width: 0.4rem; height: 0.4rem; top: 1.1rem; left: 2.9rem; }

.mark-stack::before { width: 4.5rem; height: 1px; top: 1.4rem; left: 0; }
.mark-stack::after {
  opacity: 0.35;
  width: 3rem;
  height: 1px;
  box-shadow: 0 0.8rem 0 var(--color-accent);
  top: 2.2rem;
  left: 0;
}

.mark-grid::before {
  background:
    linear-gradient(var(--color-accent), var(--color-accent)) 0 0 / 100% 1px no-repeat,
    linear-gradient(var(--color-accent), var(--color-accent)) 0 100% / 100% 1px no-repeat,
    linear-gradient(var(--color-accent), var(--color-accent)) 0 0 / 1px 100% no-repeat,
    linear-gradient(var(--color-accent), var(--color-accent)) 100% 0 / 1px 100% no-repeat;
  opacity: 0.7;
  width: 2.75rem;
  height: 2.75rem;
  top: 0.85rem;
  left: 0;
}
.mark-grid::after {
  opacity: 0.35;
  width: 1px;
  height: 2.75rem;
  box-shadow: 1.35rem 0 0 var(--color-accent);
  top: 0.85rem;
  left: 1.35rem;
}

.mark-pulse::before { border-radius: 50%; width: 0.55rem; height: 0.55rem; top: 1.7rem; left: 0; }
.mark-pulse::after {
  opacity: 0.4;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  width: 5rem;
  height: 1px;
  top: 1.95rem;
  left: 0.9rem;
}

.mark-flow::before {
  border-left: 5rem solid transparent;
  border-bottom: 1px solid var(--color-accent);
  opacity: 0.7;
  background: 0 0;
  width: 0;
  height: 0;
  top: 2rem;
  left: 0;
  transform: skew(-28deg);
}
.mark-flow::after { border-radius: 1px; width: 0.45rem; height: 0.45rem; top: 1.55rem; left: 4.4rem; }

.work-case-mark.mark { border-top: none; height: 2.75rem; margin-top: 0.25rem; }
@media (width >= 768px) {
  .work-case-mark.mark { height: 3.25rem; }
}
@media (width >= 1100px) {
  .work-case-mark.mark { border-top: none; height: 5.5rem; }
}

/* ---------- Kinh nghiệm ---------- */
.exp-grid { display: grid; gap: 2rem; }
@media (width >= 48rem) {
  .exp-grid { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 4rem; }
}
.exp-edu { font-size: 1.125rem; line-height: 1.625; color: var(--color-ink-soft); }

.timeline {
  margin: 0;
  padding: 0 0 0 1.25rem;
  border-left: 1px solid var(--color-rule);
}
.timeline li { position: relative; padding-bottom: 1.75rem; }
.timeline-dot {
  position: absolute;
  top: 0.375rem;
  left: -1.45rem;
  height: 0.5rem;
  width: 0.5rem;
  border-radius: 9999px;
  background-color: var(--color-accent);
}
@media (width >= 48rem) {
  .timeline { padding-left: 1.5rem; }
  .timeline li { padding-bottom: 2rem; }
  .timeline-dot { left: -1.7rem; }
}
.timeline li:last-child { padding-bottom: 0; }

.timeline-date { color: var(--color-ink-soft); }
.timeline-company { margin-top: 0.5rem; color: var(--color-ink-soft); }
.timeline-company.is-strong { font-weight: 500; color: var(--color-ink); }
.timeline-role { margin-top: 0.25rem; font-size: 1rem; line-height: 1.5; color: var(--color-ink-soft); }

/* ---------- Kỹ năng ---------- */
.skills-grid { margin-top: 2rem; display: grid; gap: 2rem; }
.skills-stack { display: grid; gap: 2rem; }
@media (width >= 48rem) {
  .skills-grid { margin-top: 3rem; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem; }
}

.skill-col { border-top: 1px solid var(--color-rule); padding-top: 1.25rem; }
.skill-col-title { margin-bottom: 0.75rem; color: var(--color-accent); }
@media (width >= 48rem) {
  .skill-col-title { margin-bottom: 1rem; }
}
.skill-col ul { margin: 0.75rem 0 0; padding: 0; }
.skill-col li {
  border-bottom: 1px solid var(--color-rule);
  margin: 0;
  padding: 0.35rem 0;
  font-size: 1.05rem;
  line-height: 1.4;
  list-style: none;
}

/* ---------- Liên hệ ---------- */
.contact-inner { padding-top: 2.5rem; }
.contact-lead {
  margin-top: 1rem;
  max-width: min(28ch, 100%);
  font-size: clamp(1.55rem, 4.5vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.contact-list { margin: 2.5rem 0 0; display: grid; gap: 1.5rem; }
.contact-list > div { min-width: 0; }
.contact-list dt { color: var(--color-ink-soft); }
.contact-list dd { margin: 0.5rem 0 0; }
.contact-link { font-size: 1.125rem; line-height: calc(1.75 / 1.125); }

@media (width >= 40rem) {
  .contact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
}
@media (width >= 48rem) {
  .contact-inner { padding-top: 3.5rem; }
  .contact-lead { margin-top: 1.25rem; }
  .contact-list { margin-top: 3rem; }
  .contact-link { font-size: 1.25rem; line-height: 1.4; }
}

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-rule); }
.footer-inner { padding-block: 2.5rem; }
.footer-top { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-name { font-size: 1.25rem; line-height: 1.4; letter-spacing: -0.025em; }
.footer-bottom {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  border-top: 1px solid var(--color-rule);
  padding-top: 1.5rem;
}
.footer-links { display: flex; flex-wrap: wrap; align-items: center; column-gap: 1.5rem; row-gap: 0.75rem; }

@media (width >= 40rem) {
  .footer-top { flex-direction: row; align-items: baseline; justify-content: space-between; gap: 0.75rem; }
  .footer-bottom { flex-direction: row; align-items: center; justify-content: space-between; gap: 1rem; }
}
@media (width >= 48rem) {
  .footer-inner { padding-block: 3rem; }
  .footer-name { font-size: 1.5rem; line-height: calc(2 / 1.5); }
  .footer-bottom { margin-top: 2.5rem; }
}

/* ---------- Giảm chuyển động ---------- */
@media (prefers-reduced-motion: reduce) {
  .skip-link { transition: none; }
  .work-item { transition: none; }
  .to-top, .to-top::after { transition: color 0.2s; }
  .to-top:active, .to-top:hover::after { transform: none; }
  .section-atmosphere::before { transition: opacity 0.2s; }
  .menu-bar, .mobile-drawer { transition: none; }
  .menu-backdrop { transition: opacity 0.15s; }
  .drawer-link { opacity: 1; transition: none; transform: none; transition-delay: 0s !important; }
  .cta-text { transition: color 0.2s, border-color 0.2s; }
  .cta-text:active, .menu-toggle:active { transform: none; }
  .menu-toggle { transition: none; }
}