/* ═══════════════════════════════════════════════════════════
   site.css – CSS DÙNG CHUNG cho toàn bộ site Power365SME
   Gồm: biến màu & font, reset, kiểu cơ bản, .container, tiện ích chung,
   header và footer. Sửa ở đây là mọi trang cập nhật theo.
   CSS riêng của từng trang vẫn để trong thẻ <style> của trang đó
   (và được đặt SAU file này để có thể ghi đè khi cần).
   ═══════════════════════════════════════════════════════════ */

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

/* ── BIẾN MÀU, FONT ── */
:root {
  --navy:      #08142e;
  --navy-2:    #0d2149;
  --blue:      #1d4ed8;
  --blue-mid:  #2563eb;
  --blue-lt:   #3b82f6;
  --sky:       #0ea5e9;
  --sky-lt:    #38bdf8;
  --blue-100:  #dbeafe;
  --blue-50:   #eff6ff;
  --white:     #ffffff;
  --gray-50:   #f8fafc;
  --gray-100:  #f1f5f9;
  --gray-200:  #e2e8f0;
  --gray-400:  #94a3b8;
  --gray-600:  #475569;
  --gray-800:  #1e293b;
  --accent:    #38bdf8;
  --ok:        #15803d;
  --warn:      #b45309;
  --err:       #b91c1c;

  --display: 'Plus Jakarta Sans', system-ui, sans-serif;
  --body:    'Inter', system-ui, sans-serif;
  --paper:   'Tinos', 'Times New Roman', Times, serif;
  --r:  12px;
  --r2: 20px;
  --sh: 0 4px 24px rgba(8,20,46,.10);
  --sh2: 0 16px 48px rgba(8,20,46,.18);
}

/* ── CƠ BẢN ── */
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--body); color: var(--gray-600); background: var(--white); line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; }

/* ── TIỆN ÍCH CHUNG ── */
.container { max-width: 1160px; margin: 0 auto; padding: 0 1vw; }
.eyebrow { font-size: .72rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--sky); margin-bottom: .6rem; display: block; }
.section-title { font-family: var(--display); font-size: clamp(1.75rem,3vw,2.5rem); font-weight: 800; color: var(--navy); letter-spacing: -.02em; line-height: 1.18; margin-bottom: 1rem; }
.section-sub { font-size: 1rem; color: var(--gray-600); max-width: 560px; line-height: 1.8; }
.text-center { text-align: center; }
.text-center .section-sub { margin: 0 auto; }

@media (max-width: 640px) {
  .container { padding: 0 1.25rem; }
}

/* ═══ HEADER & FOOTER ═══ */
site-header, site-footer { display: block; }

/* ── NAV ── */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 64px;
  background: rgba(8,20,46,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background .3s;
}
.nav-inner { height: 64px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-family: var(--display); font-size: 1.2rem; font-weight: 800; color: var(--white); letter-spacing: -.02em; display: inline-flex; align-items: center;}
.logo img { width: 50px; height: auto; margin-right: 2px; }
.logo span { color: var(--sky); }
.nav-right { display: flex; align-items: center; gap: 1.5rem; }
.nav-links { display: flex; gap: 1.8rem; list-style: none; align-items: center; }
.nav-links a { font-size: .875rem; font-weight: 500; color: rgba(255,255,255,.65); transition: color .2s; }
.nav-links a:hover { color: var(--white); }
.nav-cta { background: var(--blue-mid) !important; color: var(--white) !important; padding: .45rem 1.1rem; border-radius: 6px; }
.nav-cta:hover { background: var(--blue-lt) !important; }

/* Language Toggle Switcher */
.lang-switcher { display: flex;gap: 4px;align-items: center; }
.lang-btn { background: transparent;border: 1px solid transparent;padding: 2px;cursor: pointer;border-radius: 4px;display: flex;align-items: center;justify-content: center;transition: all 0.2s ease;opacity: 0.6; }
.lang-btn:hover { opacity: 0.9; }
.lang-btn.active { opacity: 1;border-color: #007bff; }
.flag-icon { width: 21px;height: 14px;object-fit: cover;border-radius: 2px;box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); }
.sr-only { position: absolute;width: 1px;height: 1px;padding: 0;margin: -1px;overflow: hidden;clip: rect(0, 0, 0, 0);border: 0; }

/* Menu thả xuống "Công cụ" */
.nav-dd { position: relative; }
.nav-dd-btn { display: inline-flex; align-items: center; gap: .3rem; background: none; border: 0; cursor: pointer; padding: 0;
  font: 500 .875rem var(--body); color: rgba(255,255,255,.65); transition: color .2s; }
.nav-dd-btn:hover, .nav-dd.open .nav-dd-btn, .nav-dd.is-current .nav-dd-btn { color: var(--white); }
.nav-dd-btn svg { width: 12px; height: 12px; transition: transform .2s; }
.nav-dd.open .nav-dd-btn svg { transform: rotate(180deg); }
.nav-dd-menu { position: absolute; top: calc(100% + 14px); right: -1rem; width: 560px; max-width: calc(100vw - 2rem);
  background: var(--white); border-radius: 14px; box-shadow: 0 18px 50px rgba(8,20,46,.28); padding: 1rem;
  opacity: 0; visibility: hidden; transition: opacity .15s, visibility .15s; }
.nav-dd-menu::before { content: ""; position: absolute; top: -14px; left: 0; right: 0; height: 14px; }  /* cầu nối để rê chuột không bị mất menu */
.nav-dd.open .nav-dd-menu { opacity: 1; visibility: visible; }
@media (hover: hover) and (min-width: 961px) { .nav-dd:hover .nav-dd-menu { opacity: 1; visibility: visible; } }
.nav-dd-title { font-size: .72rem; font-weight: 700; color: var(--gray-400); margin: 0 .5rem .5rem; }
.nav-dd-title2 { margin-top: .75rem; padding-top: .75rem; border-top: 1px solid var(--gray-100); }
.nav-dd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .15rem; }
.nav-links .nav-dd-grid a { display: block; padding: .55rem .7rem; border-radius: 8px; color: var(--gray-800); line-height: 1.35; }
.nav-links .nav-dd-grid a:hover { background: var(--blue-50); color: var(--blue-mid); }
.nav-dd-grid a b { display: block; font-size: .875rem; font-weight: 600; }
.nav-dd-grid a small { display: block; font-size: .76rem; color: var(--gray-600); font-weight: 400; }
.nav-links .nav-dd-grid a[aria-current="page"] { background: var(--blue-50); color: var(--blue-mid); }
.nav-links a, .nav-dd-btn { white-space: nowrap; }

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 4px; flex-direction: column; gap: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: all .3s; }

/* ── FOOTER ── */
footer { background: var(--navy); border-top: 1px solid rgba(255,255,255,.06); padding: 3rem 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem; }
.footer-logo { font-family: var(--display); font-size: 1.1rem; font-weight: 800; color: var(--white); }
.footer-logo span { color: var(--sky); }
.footer-links { display: flex; gap: 1.5rem; list-style: none; }
.footer-links a { font-size: .82rem; color: rgba(255,255,255,.4); transition: color .2s; }
.footer-links a:hover { color: var(--white); }
.footer-copy { font-size: .78rem; color: rgba(255,255,255,.25); }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; gap: 0; position: fixed; top: 64px; left: 0; right: 0; background: var(--navy); border-bottom: 1px solid rgba(255,255,255,.08); padding: .5rem 0 1rem; max-height: calc(100vh - 64px); overflow-y: auto; }
  .nav-links.open li { width: 100%; }
  .nav-links.open a { display: block; padding: .75rem 1.5rem; }
  .nav-links.open .nav-cta { margin: .5rem 1.5rem 0; display: block; text-align: center; border-radius: 6px; }
  .hamburger { display: flex; }
  .nav-dd-btn { width: 100%; justify-content: space-between; padding: .75rem 1.5rem; }
  .nav-dd-menu { position: static; transform: none; width: auto; max-width: none; background: rgba(255,255,255,.04); border-radius: 0; box-shadow: none; padding: .25rem 0; display: none; opacity: 1; visibility: visible; }
  .nav-dd.open .nav-dd-menu { display: block; }
  .nav-dd-title { display: none; }
  .nav-dd-title2 { display: none; }
  .nav-dd-grid { grid-template-columns: 1fr; }
  .nav-links.open .nav-dd-grid a { padding: .55rem 1.5rem .55rem 2.25rem; color: rgba(255,255,255,.8); border-radius: 0; }
  .nav-links.open .nav-dd-grid a:hover, .nav-links.open .nav-dd-grid a[aria-current="page"] { background: rgba(255,255,255,.06); color: var(--white); }
  .nav-dd-grid a small { color: rgba(255,255,255,.45); }
}

@media (max-width: 640px) {
  .logo { font-size: 1rem; }
  .logo img { width: 30px; }
  .nav-right { gap: 1rem; }
  footer { padding: 2rem 0; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 1rem; }
}