/* =====================================================================
   CV / PORTFOLIO  —  Fullstack Developer
   Accent: teal/VETC  ·  Light + Dark theme  ·  Print-to-PDF ready
   ===================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --accent:        #0fb5a6;   /* teal VETC */
  --accent-deep:   #0a8d82;
  --accent-soft:   #d4f5f1;
  --grad:          linear-gradient(120deg, #12c2b3 0%, #0a8d82 100%);

  --bg:            #f6f9f9;
  --bg-alt:        #ffffff;
  --surface:       #ffffff;
  --line:          #e3eceb;
  --text:          #0e2a28;
  --text-soft:     #51635f;
  --shadow:        0 10px 30px -12px rgba(10, 60, 56, .18);
  --shadow-lg:     0 24px 60px -20px rgba(10, 60, 56, .30);

  --radius:        16px;
  --radius-sm:     10px;
  --maxw:          1080px;

  --font:    'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono:    'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
}

[data-theme="dark"] {
  --accent:        #2bd4c4;
  --accent-deep:   #14b8a6;
  --accent-soft:   rgba(43, 212, 196, .14);
  --grad:          linear-gradient(120deg, #2bd4c4 0%, #11a899 100%);

  --bg:            #07100f;
  --bg-alt:        #0c1817;
  --surface:       #0f1d1b;
  --line:          #1d302d;
  --text:          #e8f3f1;
  --text-soft:     #9bb3ae;
  --shadow:        0 10px 30px -12px rgba(0, 0, 0, .55);
  --shadow-lg:     0 24px 60px -18px rgba(0, 0, 0, .65);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s ease, color .4s ease;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
::selection { background: var(--accent); color: #fff; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 600 .92rem/1 var(--font);
  padding: .8rem 1.4rem; border-radius: 999px;
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .2s, box-shadow .25s, background .25s, color .25s, border-color .25s;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 8px 22px -8px var(--accent-deep); }
.btn--primary:hover { box-shadow: 0 14px 30px -8px var(--accent-deep); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.icon-btn {
  width: 42px; height: 42px; display: grid; place-items: center;
  background: transparent; border: 1.5px solid var(--line); border-radius: 12px;
  color: var(--text); cursor: pointer; font-size: 1.1rem;
  transition: border-color .25s, color .25s, transform .2s;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 1.2rem;
  padding: .9rem clamp(1rem, 4vw, 2.4rem);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav__brand { display: flex; align-items: center; gap: .55rem; font-weight: 800; font-size: 1.05rem; }
.nav__logo { font-family: var(--mono); color: var(--accent); }
.nav__links { display: flex; gap: .3rem; margin-left: auto; }
.nav__links a {
  position: relative; padding: .5rem .8rem; border-radius: 8px;
  font-weight: 500; font-size: .92rem; color: var(--text-soft);
  transition: color .2s, background .2s;
}
.nav__links a:hover, .nav__links a.active { color: var(--accent); background: var(--accent-soft); }
.nav__actions { display: flex; align-items: center; gap: .6rem; }
.icon-sun, .icon-moon { display: none; }
[data-theme="light"] .icon-moon, :root:not([data-theme="dark"]) .icon-moon { display: inline; }
[data-theme="dark"] .icon-sun { display: inline; }
.nav__burger { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(3.5rem, 9vw, 7rem) clamp(1rem, 5vw, 2.4rem) clamp(3rem, 7vw, 5rem);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(circle at 70% 20%, #000, transparent 70%);
          mask-image: radial-gradient(circle at 70% 20%, #000, transparent 70%);
  opacity: .5;
}
.hero__glow {
  position: absolute; top: -180px; right: -120px; width: 540px; height: 540px;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 38%, transparent), transparent 65%);
  filter: blur(20px); pointer-events: none;
}
.hero__inner {
  position: relative; max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1.5fr .9fr; gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
.hero__hello { font-family: var(--mono); color: var(--text-soft); font-size: .95rem; margin-bottom: 1rem; }
.term { color: var(--accent); }
.type::after { content: '▋'; color: var(--accent); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero__name {
  font-size: clamp(2.4rem, 6.5vw, 4.2rem); font-weight: 900; line-height: 1.05;
  letter-spacing: -.02em; margin-bottom: .5rem;
}
.hero__role { font-size: clamp(1.1rem, 2.4vw, 1.6rem); font-weight: 700; margin-bottom: 1.1rem; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sep { color: var(--accent); margin: 0 .4rem; }
.hero__tag { color: var(--text-soft); font-size: 1.05rem; max-width: 46ch; margin-bottom: 1.8rem; }

.hero__cta { display: flex; flex-wrap: wrap; gap: .8rem; margin-bottom: 1.8rem; }

.hero__chips { list-style: none; display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; }
.hero__chips li { display: flex; align-items: center; gap: .5rem; font-size: .92rem; color: var(--text-soft); }
.hero__chips span { color: var(--accent); }
.hero__chips a:hover { color: var(--accent); }

/* Stats */
.hero__stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem 1.2rem; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: flex-start;
  transition: transform .25s, border-color .25s;
}
.stat:hover { transform: translateY(-4px); border-color: var(--accent); }
.stat__num { font-size: 2.1rem; font-weight: 900; line-height: 1; color: var(--accent); display: inline; }
.stat__plus { font-size: 1.4rem; font-weight: 900; color: var(--accent); }
.stat__label { font-size: .82rem; color: var(--text-soft); margin-top: .4rem; }

.hero__scroll {
  position: absolute; bottom: 1.2rem; left: 50%; transform: translateX(-50%);
  font-size: 1.6rem; color: var(--accent); animation: bob 1.8s ease-in-out infinite;
}
@keyframes bob { 50% { transform: translate(-50%, 8px); } }

/* ---------- Sections ---------- */
.section {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 6rem) clamp(1rem, 5vw, 2.4rem);
}
.section--alt {
  max-width: none; background: var(--bg-alt); border-block: 1px solid var(--line);
}
.section--alt > * { max-width: var(--maxw); margin-inline: auto; }
.section__head { margin-bottom: 2.6rem; }
.section__kicker { font-family: var(--mono); font-size: .82rem; color: var(--accent); letter-spacing: .08em; }
.section__title {
  font-size: clamp(1.7rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -.02em; margin-top: .35rem;
}
.section__sub { color: var(--text-soft); margin-top: .6rem; }

.about { max-width: 70ch; font-size: 1.08rem; color: var(--text-soft); }
.about p + p { margin-top: 1rem; }
.about strong { color: var(--text); }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
.skill-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.6rem; box-shadow: var(--shadow);
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.skill-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.skill-card__title { display: flex; align-items: center; gap: .6rem; font-size: 1.15rem; margin-bottom: 1.2rem; }
.skill-card__ic { font-size: 1.3rem; }
.bars { list-style: none; display: grid; gap: 1rem; }
.bars li { display: grid; gap: .4rem; }
.bars span { font-size: .9rem; font-weight: 500; }
.bars i {
  display: block; height: 8px; border-radius: 999px;
  background: var(--line); position: relative; overflow: hidden;
}
.bars i::after {
  content: ''; position: absolute; inset: 0; width: 0; border-radius: 999px;
  background: var(--grad); transition: width 1.1s cubic-bezier(.2,.8,.2,1);
}
.bars li.show i::after { width: var(--w); }

.tagcloud { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 2rem; }
.tagcloud span {
  font-family: var(--mono); font-size: .8rem; padding: .45rem .85rem; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-deep); border: 1px solid transparent;
  transition: transform .2s, background .2s;
}
[data-theme="dark"] .tagcloud span { color: var(--accent); }
.tagcloud span:hover { transform: translateY(-2px) scale(1.04); }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px;
  background: linear-gradient(var(--accent), transparent);
}
.tl { position: relative; padding-bottom: 2.4rem; }
.tl:last-child { padding-bottom: 0; }
.tl__dot {
  position: absolute; left: -2rem; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent); box-shadow: 0 0 0 4px var(--accent-soft);
}
.tl__body {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem 1.6rem; box-shadow: var(--shadow);
  transition: transform .25s, border-color .25s;
}
.tl__body:hover { transform: translateX(4px); border-color: var(--accent); }
.tl__top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .4rem; align-items: baseline; }
.tl__top h3 { font-size: 1.18rem; }
.tl__lead { color: var(--accent); font-weight: 600; font-size: .92rem; }
.tl__date {
  font-family: var(--mono); font-size: .82rem; color: var(--accent-deep);
  background: var(--accent-soft); padding: .25rem .7rem; border-radius: 999px;
}
[data-theme="dark"] .tl__date { color: var(--accent); }
.tl__org { color: var(--text-soft); font-weight: 600; margin: .3rem 0 .9rem; }
.tl__list { list-style: none; display: grid; gap: .55rem; }
.tl__list li { position: relative; padding-left: 1.3rem; color: var(--text-soft); font-size: .96rem; }
.tl__list li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.tl__list strong { color: var(--text); }
.tl__tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.tl__tags span {
  font-family: var(--mono); font-size: .74rem; padding: .25rem .6rem; border-radius: 6px;
  border: 1px solid var(--line); color: var(--text-soft);
}

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.3rem; }
.proj {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem; box-shadow: var(--shadow); display: flex; flex-direction: column;
  transition: transform .25s, border-color .25s, box-shadow .25s;
  position: relative; overflow: hidden;
}
.proj::before {
  content: ''; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.proj:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.proj:hover::before { transform: scaleX(1); }
.proj__head { display: flex; justify-content: space-between; align-items: start; gap: .6rem; margin-bottom: .4rem; }
.proj__head h3 { font-size: 1.08rem; line-height: 1.3; }
.proj__role {
  flex-shrink: 0; font-size: .72rem; font-weight: 700; color: var(--accent-deep);
  background: var(--accent-soft); padding: .2rem .6rem; border-radius: 999px;
}
[data-theme="dark"] .proj__role { color: var(--accent); }
.proj__client { font-size: .82rem; color: var(--accent); font-weight: 600; margin-bottom: .7rem; }
.proj p { font-size: .92rem; color: var(--text-soft); }
.proj__tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; padding-top: 1rem; }
.proj__tags span {
  font-family: var(--mono); font-size: .72rem; padding: .22rem .55rem; border-radius: 6px;
  border: 1px solid var(--line); color: var(--text-soft);
}
.proj--ghost { border-style: dashed; background: transparent; box-shadow: none; justify-content: center; }
.proj--ghost h3 { color: var(--accent); }

/* ---------- Education ---------- */
.edu-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.edu-col__h { font-size: 1.1rem; margin-bottom: 1rem; }
.edu, .cert, .lang {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem; box-shadow: var(--shadow);
}
.edu__top { display: flex; justify-content: space-between; gap: .5rem; font-size: .95rem; margin-bottom: .3rem; }
.edu__top span { font-family: var(--mono); font-size: .8rem; color: var(--accent); }
.edu p { color: var(--text-soft); font-size: .9rem; }
.cert { list-style: none; display: grid; gap: .6rem; }
.cert li { position: relative; padding-left: 1.4rem; font-size: .92rem; color: var(--text-soft); }
.cert li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.lang { list-style: none; display: grid; gap: .9rem; }
.lang li { display: grid; gap: .15rem; }
.lang span { font-weight: 600; font-size: .95rem; }
.lang b { font-weight: 500; font-size: .85rem; color: var(--text-soft); }

/* ---------- Contact ---------- */
.contact { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 1.3rem; }
.contact__card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.8rem 1.4rem; box-shadow: var(--shadow); text-align: center;
  display: grid; gap: .4rem; justify-items: center;
  font: inherit; color: inherit; cursor: pointer;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.contact__card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow-lg); }
.contact__ic {
  width: 52px; height: 52px; display: grid; place-items: center; font-size: 1.4rem;
  border-radius: 14px; background: var(--accent-soft); color: var(--accent-deep); margin-bottom: .4rem;
}
[data-theme="dark"] .contact__ic { color: var(--accent); }
.contact__label { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-soft); }
.contact__val { font-weight: 700; word-break: break-word; }

/* ---------- Footer ---------- */
.foot {
  text-align: center; padding: 2.4rem 1rem; border-top: 1px solid var(--line);
  color: var(--text-soft); font-size: .9rem;
}
.foot__note { font-size: .8rem; margin-top: .3rem; opacity: .8; }

/* ---------- To-top ---------- */
.totop {
  position: fixed; right: 1.4rem; bottom: 1.4rem; z-index: 40;
  width: 46px; height: 46px; border-radius: 14px; border: none; cursor: pointer;
  background: var(--grad); color: #fff; font-size: 1.2rem; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transform: translateY(12px); transition: opacity .3s, transform .3s;
}
.totop.show { opacity: 1; pointer-events: auto; transform: none; }

/* ---------- Phone button (chip) ---------- */
.chip-btn {
  font: inherit; background: none; border: none; padding: 0; cursor: pointer;
  color: inherit; border-bottom: 1px dashed var(--accent); transition: color .2s;
}
.chip-btn:hover { color: var(--accent); }

/* ---------- Modal (captcha SĐT) ---------- */
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 1rem; }
.modal[hidden] { display: none; }
.modal__overlay { position: absolute; inset: 0; background: rgba(4, 18, 17, .55); backdrop-filter: blur(4px); }
.modal__box {
  position: relative; z-index: 1; width: min(380px, 100%); text-align: center;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.9rem 1.6rem; box-shadow: var(--shadow-lg); animation: pop .25s ease;
}
@keyframes pop { from { transform: translateY(14px) scale(.96); opacity: 0; } }
.modal__x {
  position: absolute; top: .6rem; right: .8rem; background: none; border: none;
  font-size: 1.05rem; cursor: pointer; color: var(--text-soft);
}
.modal__box h3 { font-size: 1.15rem; margin-bottom: .4rem; }
.modal__desc { color: var(--text-soft); font-size: .9rem; margin-bottom: 1.1rem; }
.modal__math {
  font-family: var(--mono); font-size: 1.7rem; font-weight: 700; color: var(--accent-deep);
  background: var(--accent-soft); border-radius: var(--radius-sm); padding: .9rem; margin-bottom: 1rem;
}
[data-theme="dark"] .modal__math { color: var(--accent); }
.modal__input {
  width: 100%; font: 600 1rem var(--font); text-align: center;
  padding: .75rem; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--text); margin-bottom: .9rem;
}
.modal__input:focus { outline: none; border-color: var(--accent); }
.modal__err { color: #e5484d; font-size: .85rem; margin-bottom: .7rem; }
.modal #mathSubmit, .modal__result .btn { width: 100%; justify-content: center; }
.modal__result { margin-top: 1rem; display: grid; gap: .7rem; }
.modal__phone {
  font-family: var(--mono); font-size: 1.5rem; font-weight: 700; letter-spacing: .04em; color: var(--accent);
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; }
  .skills, .projects, .edu-grid, .contact { grid-template-columns: 1fr; }
  .nav__links {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--bg-alt); border-bottom: 1px solid var(--line); padding: .5rem;
    transform: translateY(-130%); transition: transform .3s; margin-left: 0;
  }
  .nav__links.open { transform: none; }
  .nav__burger { display: grid; }
  .printBtn-hide { display: none; }
}
@media (max-width: 520px) {
  .hero__stats { grid-template-columns: 1fr 1fr; }
  #printBtn { display: none; }
}

/* =====================================================================
   PRINT  →  PDF (A4, sạch, trắng đen + accent, gửi HR)
   Mẹo: Ctrl+P → khổ A4 → Margins: Default → BẬT "Background graphics"
   ===================================================================== */
@media print {
  :root {
    --bg: #fff; --bg-alt: #fff; --surface: #fff; --line: #d6e0df;
    --text: #10302d; --text-soft: #3f5350; --shadow: none; --shadow-lg: none;
  }
  @page { size: A4; margin: 12mm 12mm; }

  .nav, .modal, .hero__scroll, .hero__cta, .totop, #burger,
  .hero__grid, .hero__glow, .proj--ghost, .section__kicker { display: none !important; }
  .chip-btn { border-bottom: none; }

  body { background: #fff; font-size: 11px; line-height: 1.45; }
  .hero { padding: 0 0 12px; border: none; }
  .hero__inner { grid-template-columns: 1fr; gap: .4rem; }
  .hero__name { font-size: 26px; }
  .hero__role { font-size: 14px; margin-bottom: .4rem; }
  .hero__hello, .hero__tag { font-size: 10px; margin-bottom: .3rem; }
  .hero__stats {
    grid-template-columns: repeat(4, 1fr); gap: .4rem; margin-top: .6rem;
    page-break-inside: avoid;
  }
  .stat { padding: .5rem; box-shadow: none; }
  .stat__num { font-size: 16px; }

  .section { padding: 10px 0; max-width: none; }
  .section--alt { border: none; }
  .section__head { margin-bottom: .6rem; }
  .section__title { font-size: 15px; border-bottom: 1.5px solid var(--accent); padding-bottom: 3px; }

  .reveal { opacity: 1 !important; transform: none !important; }
  .bars i::after { width: var(--w) !important; transition: none; }

  .skills, .projects, .edu-grid { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .skill-card, .tl__body, .proj, .edu, .cert, .lang, .contact__card, .stat {
    box-shadow: none; border-color: var(--line); page-break-inside: avoid;
  }
  .skill-card, .proj { padding: .7rem .8rem; }
  .timeline { page-break-inside: auto; }
  .tl { page-break-inside: avoid; padding-bottom: .8rem; }
  .contact { grid-template-columns: repeat(2, 1fr); }
  .foot { border: none; padding: 8px 0 0; }
  .totop, .icon-btn { display: none !important; }
  a { color: var(--text) !important; }
}