/* ══════════════════════════════════════════════
   CANARY SOFTWARE — Shared Design System v2
   Yellow · Black · White  |  Responsive + i18n
   ══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Barlow:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400&family=Space+Mono:wght@400;700&display=swap');

/* ── TOKENS ── */
:root {
  --yellow:      #FFD600;
  --yellow-soft: #FFF3A3;
  --yellow-dim:  rgba(255,214,0,0.12);
  --black:       #111111;
  --black-off:   #1A1A1A;
  --white:       #FFFFFF;
  --white-off:   #F7F5F0;
  --gray-100:    #EBEBEB;
  --gray-300:    #BDBDBD;
  --gray-500:    #757575;
  --gray-700:    #424242;
  --border-dark: #2A2A2A;
  --border-light:#E0E0E0;

  /* Semantic */
  --bg-dark:  var(--black);
  --bg-mid:   var(--black-off);
  --bg-light: var(--white-off);
  --text-on-dark:  var(--white);
  --text-on-light: var(--black);

  /* Spacing */
  --sp-1: 0.5rem;
  --sp-2: 1rem;
  --sp-3: 1.5rem;
  --sp-4: 2rem;
  --sp-5: 3rem;
  --sp-6: 4rem;
  --sp-7: 6rem;

  /* Nav height */
  --nav-h: 68px;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ── BASE ── */
body {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ── LANGUAGE SYSTEM ── */
.vi { display: none !important; }
.en { display: block !important; }
.en-inline { display: inline !important; }
.vi-inline { display: none !important; }

body.lang-vi .vi        { display: block !important; }
body.lang-vi .en        { display: none !important; }
body.lang-vi .vi-inline { display: inline !important; }
body.lang-vi .en-inline { display: none !important; }

/* ── CONTAINER ── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}
@media (max-width: 1100px) { .container { padding: 0 var(--sp-4); } }
@media (max-width: 640px)  { .container { padding: 0 var(--sp-3); } }

/* ── SECTION VARIANTS ── */
.section       { padding: var(--sp-6) 0; }
.section-sm    { padding: var(--sp-4) 0; }
.section-xl    { padding: var(--sp-7) 0; }
.sec-dark      { background: var(--bg-dark); color: var(--text-on-dark); }
.sec-mid       { background: var(--bg-mid);  color: var(--text-on-dark); }
.sec-yellow    { background: var(--yellow);  color: var(--black); }
.sec-light     { background: var(--bg-light);color: var(--text-on-light); }
.sec-white     { background: var(--white);   color: var(--text-on-light); }

@media (max-width: 768px) {
  .section    { padding: var(--sp-5) 0; }
  .section-xl { padding: var(--sp-6) 0; }
}

/* ── TYPOGRAPHY ── */
.display {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(52px, 9vw, 128px);
  line-height: 0.93;
  letter-spacing: -0.01em;
}
.title-xl {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(36px, 5vw, 72px);
  line-height: 0.95;
}
.title-lg {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1;
}
.title-md {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(20px, 2.5vw, 32px);
  line-height: 1.05;
}
.label {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
}
.label-dark { color: var(--gray-500); }
.mono {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}
.accent-y { color: var(--yellow); }
.accent-b { color: var(--black); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.7rem 1.6rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: all 0.22s ease;
  white-space: nowrap;
  border-radius: 0;
  font-weight: 400;
}
.btn-yellow  { background: var(--yellow); color: var(--black); }
.btn-yellow:hover { background: var(--black); color: var(--yellow); }
.btn-black   { background: var(--black); color: var(--yellow); }
.btn-black:hover  { background: var(--yellow); color: var(--black); }
.btn-outline-white { border: 1.5px solid rgba(255,255,255,0.35); color: var(--white); }
.btn-outline-white:hover { border-color: var(--yellow); color: var(--yellow); }
.btn-outline-black { border: 1.5px solid var(--black); color: var(--black); }
.btn-outline-black:hover { background: var(--black); color: var(--yellow); }
.btn-sm { padding: 0.5rem 1.1rem; font-size: 0.65rem; }
.btn-lg { padding: 0.9rem 2.2rem; font-size: 0.8rem; }

/* ── NAV ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(17,17,17,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-dark);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}
@media (max-width: 640px) { .nav-inner { padding: 0 var(--sp-3); } }

/* Logo */
.logo { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.logo img { height: 60px; width: auto; }
.logo-text {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.55rem;
  color: var(--white);
  letter-spacing: 0.04em;
  line-height: 1;
}
.logo-dot { color: var(--yellow); }

/* Desktop links */
.nav-links {
  display: flex;
  list-style: none;
  gap: var(--sp-4);
  margin-left: auto;
}
.nav-links a {
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--gray-300);
  transition: color 0.2s;
  letter-spacing: 0.03em;
}
.nav-links a:hover  { color: var(--white); }
.nav-links a.active { color: var(--yellow); }

/* Lang switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--border-dark);
  padding: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}
.lang-btn {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  padding: 4px 8px;
  color: var(--gray-500);
  border-radius: 1px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  background: none;
}
.lang-btn.active { background: var(--yellow); color: var(--black); font-weight: 700; }
.lang-btn:not(.active):hover { color: var(--white); }

/* CTA btn in nav */
.nav-cta { flex-shrink: 0; }
@media (max-width: 900px) { .nav-cta { display: none; } }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--white);
  transition: all 0.3s;
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* Mobile drawer */
.mobile-nav {
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: var(--black);
  border-top: 1px solid var(--border-dark);
  z-index: 999;
  transform: translateY(-110%);
  transition: transform 0.35s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.mobile-nav.open { transform: translateY(0); }
.mobile-nav-inner {
  padding: var(--sp-3) var(--sp-3) var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: 0;
}
.mobile-nav a {
  display: block;
  padding: var(--sp-2) 0;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--gray-300);
  text-decoration: none;
  border-bottom: 1px solid var(--border-dark);
  letter-spacing: 0.03em;
  transition: color 0.2s;
}
.mobile-nav a:hover, .mobile-nav a.active { color: var(--yellow); }
.mobile-nav-footer {
  padding-top: var(--sp-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

/* Responsive nav show/hide */
@media (min-width: 769px) {
  .hamburger { display: none; }
  .nav-links  { display: flex; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
}

/* ── PAGE OFFSET ── */
.page-top { padding-top: var(--nav-h); }

/* ── PAGE HEADER (inner pages) ── */
.page-header {
  background: var(--black);
  padding: calc(var(--nav-h) + var(--sp-6)) 0 var(--sp-6);
  border-bottom: 3px solid var(--yellow);
  position: relative;
  overflow: hidden;
}
.page-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 40px,
    rgba(255,214,0,0.015) 40px,
    rgba(255,214,0,0.015) 41px
  );
  pointer-events: none;
}
.page-header .container { position: relative; z-index: 1; }
.page-header h1 { color: var(--white); margin-top: var(--sp-2); }
.page-header .sub {
  color: var(--gray-300);
  font-size: 1rem;
  line-height: 1.75;
  max-width: 620px;
  margin-top: var(--sp-3);
}
.page-header .sub-vi {
  color: var(--gray-500);
  font-style: italic;
  font-size: 0.9rem;
  margin-top: 0.4rem;
}

/* ── MARQUEE ── */
.marquee-wrap {
  background: var(--yellow);
  overflow: hidden;
  border-top: 1px solid rgba(0,0,0,0.1);
  border-bottom: 1px solid rgba(0,0,0,0.1);
}
.marquee-track {
  display: flex;
  gap: var(--sp-4);
  padding: 0.75rem 0;
  animation: marquee 22s linear infinite;
  width: max-content;
}
.marquee-track:hover { animation-play-state: paused; }
.marquee-item {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--black);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.marquee-sep { color: rgba(0,0,0,0.3); }

/* ── SECTION HEADER ── */
.section-hdr { margin-bottom: var(--sp-5); }
.section-hdr .label { margin-bottom: var(--sp-1); }

/* ── CARDS ── */
.card-border {
  border: 1px solid var(--border-light);
  padding: var(--sp-4);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.card-border:hover {
  border-color: var(--yellow);
  box-shadow: 0 0 0 2px var(--yellow);
}
.card-dark {
  background: var(--bg-mid);
  border: 1px solid var(--border-dark);
  padding: var(--sp-4);
  transition: border-color 0.25s;
}
.card-dark:hover { border-color: var(--yellow); }

/* ── TAG / PILL ── */
.tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border: 1px solid currentColor;
  display: inline-block;
}
.tag-yellow { color: var(--yellow); }
.tag-black  { background: var(--black); color: var(--yellow); border-color: var(--black); }
.tag-outline{ color: var(--gray-500); }

/* ── DIVIDER ── */
.hr-yellow { border: none; border-top: 2px solid var(--yellow); margin: var(--sp-5) 0; }
.hr-dark   { border: none; border-top: 1px solid var(--border-dark); }
.hr-light  { border: none; border-top: 1px solid var(--border-light); }

/* ── HIGHLIGHT ── */
.highlight {
  background: var(--yellow-dim);
  border-left: 3px solid var(--yellow);
  padding: var(--sp-3) var(--sp-4);
}

/* ── STAT BOX ── */
.stat-box { border-top: 2px solid var(--yellow); padding-top: var(--sp-2); }
.stat-num  {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1;
}
.stat-label { font-size: 0.78rem; line-height: 1.4; margin-top: 4px; }

/* ── FOOTER ── */
.footer {
  background: var(--black);
  border-top: 3px solid var(--yellow);
  padding: var(--sp-5) 0 var(--sp-4);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--sp-5);
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-col h4 {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: var(--sp-2);
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col ul a {
  text-decoration: none;
  color: var(--gray-500);
  font-size: 0.88rem;
  transition: color 0.2s;
}
.footer-col ul a:hover { color: var(--white); }
.footer-col p { color: var(--gray-500); font-size: 0.85rem; line-height: 1.7; }
.footer-bottom {
  margin-top: var(--sp-4);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.78rem; color: var(--gray-700); }

/* ── GRID HELPERS ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-4); }
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ── UTILITIES ── */
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.text-center { text-align: center; }
.mt-1 { margin-top: var(--sp-1); } .mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); } .mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); }
.gap-2 { gap: var(--sp-2); } .gap-3 { gap: var(--sp-3); }
.w-full { width: 100%; }

/* ── ANIMATIONS ── */
@keyframes marquee     { to { transform: translateX(-50%); } }
@keyframes fadeUp      { from { opacity:0; transform:translateY(24px); } to { opacity:1; transform:none; } }
@keyframes fadeIn      { from { opacity:0; } to { opacity:1; } }
@keyframes slideRight  { from { transform:scaleX(0); } to { transform:scaleX(1); } }

.anim-up   { opacity:0; animation: fadeUp  0.7s ease forwards; }
.anim-in   { opacity:0; animation: fadeIn  0.6s ease forwards; }
.delay-1   { animation-delay: 0.1s; }
.delay-2   { animation-delay: 0.25s; }
.delay-3   { animation-delay: 0.4s; }
.delay-4   { animation-delay: 0.55s; }
.delay-5   { animation-delay: 0.7s; }
.delay-6   { animation-delay: 0.85s; }