/* ============================================================
   BASE.CSS — Design Tokens + CSS dùng chung cho toàn bộ site TechMate
   Nạp file này ở mọi trang thông qua layouts/public.php
   ============================================================ */

/* ── DESIGN TOKENS ── */
:root {
  /* Màu thương hiệu */
  --blue-900: #1E3A8A;
  --blue-700: #1D4ED8;
  --blue-500: #3B82F6;
  --blue-400: #60A5FA;
  --blue-50:  #EFF4FF;
  --blue-100: #DBE7FF;
  /* Trung tính (hơi ám xanh để hài hòa) */
  --ink-900: #0E1730;
  --ink-700: #33415C;
  --ink-500: #64748B;
  --line:    #E5EAF4;
  --white:   #FFFFFF;
  --paper:   #F7F9FD;
  /* Typography */
  --font-head: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  /* Bo góc */
  --r-sm: 10px; --r-md: 16px; --r-lg: 24px; --r-pill: 999px;
  /* Đổ bóng */
  --shadow-sm: 0 1px 2px rgba(14,23,48,.06), 0 2px 6px rgba(14,23,48,.05);
  --shadow-md: 0 8px 24px rgba(30,58,138,.10);
  --shadow-lg: 0 24px 60px rgba(30,58,138,.18);
  /* Layout */
  --maxw: 1200px;
  --gutter: clamp(20px, 5vw, 48px);
}

/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink-700);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { font-family: var(--font-head); color: var(--ink-900); line-height: 1.12; letter-spacing: -0.02em; font-weight: 700; text-wrap: balance; }
p { text-wrap: pretty; }

/* ── LAYOUT HELPERS ── */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(40px, 5.5vw, 76px); }

/* ── EYEBROW TAG ── */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-head); font-weight: 600; font-size: 13px;
  letter-spacing: .08em; text-transform: uppercase; color: var(--blue-700);
  background: var(--blue-50); border: 1px solid var(--blue-100);
  padding: 7px 14px; border-radius: var(--r-pill);
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue-500); }

/* ── SECTION HEADER ── */
.section-head { max-width: 640px; margin-bottom: clamp(36px, 5vw, 56px); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 33px); margin-top: 16px; }
.section-head p { font-size: clamp(16px, 1.6vw, 18px); color: var(--ink-500); margin-top: 14px; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-family: var(--font-head); font-weight: 600; font-size: 15px;
  padding: 14px 24px; border-radius: var(--r-pill);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  will-change: transform; white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-sm { padding: 10px 16px; font-size: 14px; }
.btn-primary { background: var(--blue-900); color: var(--white); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--blue-700); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost { background: var(--white); color: var(--ink-900); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--blue-400); color: var(--blue-700); transform: translateY(-2px); }
.btn-trial { background: var(--blue-500); color: var(--white); box-shadow: 0 6px 18px rgba(59,130,246,.35); }
.btn-trial:hover { background: var(--blue-400); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(59,130,246,.45); }
.btn-soft { background: var(--blue-50); color: var(--blue-700); border: 1px solid var(--blue-100); }
.btn-soft:hover { background: var(--blue-100); transform: translateY(-2px); }
.btn-block { width: 100%; }
@keyframes ctaPulse {
  0%, 100% { transform: scale(1);    box-shadow: 0 6px 18px rgba(59,130,246,.35); }
  50%      { transform: scale(1.06); box-shadow: 0 12px 30px rgba(59,130,246,.55); }
}
.cta-pulse { animation: ctaPulse 1.6s ease-in-out infinite; will-change: transform; }
.cta-pulse:hover { animation-play-state: paused; }
@media (prefers-reduced-motion: reduce) { .cta-pulse { animation: none; } }

/* ── HEADER / NAV ── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.site-header.scrolled { border-bottom-color: var(--line); box-shadow: 0 1px 0 rgba(14,23,48,.02); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-head); font-weight: 800; font-size: 19px; color: var(--ink-900); letter-spacing: -0.01em; }
.brand .logo {
  width: 32px; height: 30px; flex: none;
}
.nav-links { display: none; align-items: center; gap: 34px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--ink-700); transition: color .15s ease; }
.nav-links a:hover, .nav-links a.active { color: var(--blue-700); }
.nav-links a.active { font-weight: 600; }
.nav-more { position: relative; display: flex; align-items: center; }
.nav-more-trigger {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: inherit; font-size: 15px; font-weight: 500; color: var(--ink-700);
  background: none; border: none; cursor: pointer; padding: 0; transition: color .15s ease;
}
.nav-more-trigger svg { width: 14px; height: 14px; transition: transform .2s ease; }
.nav-more:hover .nav-more-trigger,
.nav-more:focus-within .nav-more-trigger { color: var(--blue-700); }
.nav-more:hover .nav-more-trigger svg,
.nav-more:focus-within .nav-more-trigger svg { transform: rotate(180deg); }
.nav-more-panel {
  position: absolute; top: calc(100% + 14px); left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 210px; background: var(--white); border: 1px solid var(--line);
  border-radius: var(--r-md); box-shadow: var(--shadow-lg); padding: 8px;
  display: flex; flex-direction: column; gap: 2px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.nav-more-panel::before { content: ""; position: absolute; left: 0; right: 0; top: -16px; height: 16px; }
.nav-more:hover .nav-more-panel,
.nav-more:focus-within .nav-more-panel { opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0); }
.nav-more-panel a { font-size: 14px; font-weight: 500; color: var(--ink-700); padding: 10px 12px; border-radius: var(--r-sm); transition: background .15s ease, color .15s ease; }
.nav-more-panel a:hover { background: var(--blue-50); color: var(--blue-700); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-actions .btn { padding: 11px 20px; font-size: 14px; }
.nav-cta-desktop { display: none; }

/* ── BỘ CHỌN NGÔN NGỮ ── */
.lang { position: relative; }
.lang-trigger {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-head); font-weight: 600; font-size: 14px; color: var(--ink-700);
  background: var(--white); border: 1px solid var(--line); border-radius: var(--r-pill);
  padding: 9px 13px; transition: border-color .15s ease, color .15s ease, box-shadow .15s ease;
}
.lang-trigger:hover { border-color: var(--blue-400); color: var(--blue-700); }
.lang.open .lang-trigger { border-color: var(--blue-400); color: var(--blue-700); box-shadow: 0 0 0 4px rgba(59,130,246,.12); }
.lang-trigger .flag { width: 22px; height: 16px; border-radius: 3px; object-fit: cover; box-shadow: 0 0 0 1px rgba(14,23,48,.10); flex: none; }
.lang-trigger .chev { width: 14px; height: 14px; transition: transform .2s ease; }
.lang.open .lang-trigger .chev { transform: rotate(180deg); }
.lang-panel {
  position: absolute; top: calc(100% + 12px); right: 0;
  min-width: 184px; background: var(--white); border: 1px solid var(--line);
  border-radius: var(--r-md); box-shadow: var(--shadow-lg); padding: 7px;
  display: flex; flex-direction: column; gap: 2px;
  opacity: 0; visibility: hidden; transform: translateY(8px); pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.lang.open .lang-panel { opacity: 1; visibility: visible; transform: none; pointer-events: auto; }
.lang-opt {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  font-family: var(--font-head); font-weight: 500; font-size: 14px; color: var(--ink-700);
  padding: 10px 12px; border-radius: var(--r-sm); transition: background .15s ease, color .15s ease;
  text-decoration: none; background: none; border: none; cursor: pointer;
}
.lang-opt .flag { width: 24px; height: 17px; border-radius: 3px; object-fit: cover; box-shadow: 0 0 0 1px rgba(14,23,48,.10); flex: none; }
.lang-opt .label { flex: 1; }
.lang-opt .tick { width: 16px; height: 16px; color: var(--blue-700); opacity: 0; flex: none; }
.lang-opt:hover { background: var(--blue-50); color: var(--blue-700); }
.lang-opt.active { color: var(--blue-700); font-weight: 600; }
.lang-opt.active .tick { opacity: 1; }

/* ── HAMBURGER BUTTON (mobile) ── */
.nav-toggle {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); background: var(--white); color: var(--ink-900);
  transition: border-color .15s ease, background .15s ease;
}
.nav-toggle:hover { border-color: var(--blue-400); }
.nav-toggle .bars { position: relative; width: 20px; height: 14px; }
.nav-toggle .bars span {
  position: absolute; left: 0; width: 100%; height: 2px; border-radius: 2px;
  background: currentColor; transition: transform .25s ease, opacity .2s ease, top .25s ease;
}
.nav-toggle .bars span:nth-child(1) { top: 0; }
.nav-toggle .bars span:nth-child(2) { top: 6px; }
.nav-toggle .bars span:nth-child(3) { top: 12px; }
.site-header.menu-open .nav-toggle .bars span:nth-child(1) { top: 6px; transform: rotate(45deg); }
.site-header.menu-open .nav-toggle .bars span:nth-child(2) { opacity: 0; }
.site-header.menu-open .nav-toggle .bars span:nth-child(3) { top: 6px; transform: rotate(-45deg); }

/* ── MOBILE MENU ── */
.mobile-menu {
  display: grid; grid-template-rows: 0fr;
  overflow: hidden; background: var(--white); border-bottom: 1px solid transparent;
  transition: grid-template-rows .3s cubic-bezier(.16,1,.3,1), border-color .3s ease;
}
.site-header.menu-open .mobile-menu { grid-template-rows: 1fr; border-bottom-color: var(--line); }
.mobile-menu-inner { min-height: 0; }
.mobile-menu .container { display: flex; flex-direction: column; padding-block: 8px 22px; }
.mobile-menu a.m-link {
  font-family: var(--font-head); font-weight: 600; font-size: 16px; color: var(--ink-900);
  padding: 14px 4px; border-bottom: 1px solid var(--line);
}
.mobile-menu a.m-link:last-of-type { border-bottom: none; }
.mobile-menu .m-cta { margin-top: 16px; }

@media (min-width: 900px) {
  .nav-links { display: flex; }
  .nav-cta-desktop { display: inline-flex; }
  .nav-toggle { display: none; }
  .mobile-menu { display: none; }
}

/* ── FOOTER ── */
.footer { background: #0B1226; color: rgba(255,255,255,.66); padding-block: clamp(48px,7vw,72px) 0; }
.footer-grid { display: grid; gap: 40px; padding-bottom: 48px; }
.footer .brand { color: #fff; }
.footer-about p { margin-top: 16px; font-size: 14px; max-width: 320px; line-height: 1.7; }
.footer-social { display: flex; gap: 10px; margin-top: 20px; }
.footer-social a { width: 38px; height: 38px; border-radius: 10px; border: 1px solid rgba(255,255,255,.14); display: grid; place-items: center; color: rgba(255,255,255,.7); transition: all .18s ease; }
.footer-social a:hover { background: var(--blue-500); border-color: var(--blue-500); color: #fff; transform: translateY(-2px); }
.footer-social svg { width: 18px; height: 18px; }
.footer-col h4 { color: #fff; font-size: 14px; font-family: var(--font-head); font-weight: 700; letter-spacing: .03em; text-transform: uppercase; margin-bottom: 16px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 11px; }
.footer-col a { font-size: 14px; color: rgba(255,255,255,.62); transition: color .15s ease; }
.footer-col a:hover { color: var(--blue-400); }
.footer-contact { display: grid; gap: 11px; margin-top: 18px; padding: 0; list-style: none; }
.footer-contact li { font-size: 14px; display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 17px; height: 17px; color: var(--blue-400); flex: none; margin-top: 3px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.10); padding-block: 22px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; font-size: 13px; }
.footer-bottom .links { display: flex; gap: 22px; flex-wrap: wrap; }
@media (min-width: 720px) { .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; } }
@media (min-width: 980px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }

/* ── SCROLL FADE-IN ANIMATION ── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}