/* =========================================================
   WOA ARCHITECTS — base.css
   Reset, biến màu theo mùa, typography, header, song ngữ
   ========================================================= */

:root {
  /* màu chủ đạo — JS đổi theo mùa (data-season trên <html>) */
  --primary: #25408F;
  --primary-soft: rgba(37, 64, 143, 0.08);
  --ink: #1c1c1c;
  --ink-soft: rgba(28, 28, 28, 0.55);
  --bg: #ffffff;
  --line: rgba(37, 64, 143, 0.25);
  --vi-opacity: 0.55;
  --header-h: 76px;
  --gutter: clamp(16px, 4vw, 52px);
  --ease-slow: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-season="spring"] {
  --primary: #2E8B57;
  --primary-soft: rgba(46, 139, 87, 0.08);
  --line: rgba(46, 139, 87, 0.25);
}

html[data-season="summer"] {
  --primary: #25408F;
  --primary-soft: rgba(37, 64, 143, 0.08);
  --line: rgba(37, 64, 143, 0.25);
}

html[data-season="autumn"] {
  --primary: #B45F1D;
  --primary-soft: rgba(180, 95, 29, 0.08);
  --line: rgba(180, 95, 29, 0.25);
}

html[data-season="winter"] {
  --primary: #4A5568;
  --primary-soft: rgba(74, 85, 104, 0.08);
  --line: rgba(74, 85, 104, 0.25);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
}

ul {
  list-style: none;
}

/* ---------- song ngữ: EN trước, VI mờ ngay dưới ---------- */
.vi {
  opacity: var(--vi-opacity);
}

.en {
  color: var(--primary);
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  padding: 0 var(--gutter);
}

.site-header__bar {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--primary);
  flex-shrink: 0;
}

.brand__logo {
  width: 42px;
  height: 42px;
  color: var(--primary);
}

.brand__logo svg {
  width: 100%;
  height: 100%;
}

.brand__name {
  font-size: 18px;
  letter-spacing: 0.18em;
  font-weight: 500;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 38px);
  list-style: none;
}

.site-nav a {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
  transition: color 0.3s;
  padding: 6px 0;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
}

/* đường kẻ + icon tìm kiếm dưới menu */
.site-header__rule {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  /* padding-bottom: 6px; */
  border-bottom: 1px solid var(--line);
}

.site-header__rule::before {
  display: none;
}

.search-toggle {
  color: var(--primary);
  display: flex;
  padding: 4px;
}

.search-toggle svg {
  width: 18px;
  height: 18px;
}

.search-box {
  display: none;
  align-items: center;
  gap: 8px;
}

.search-box.open {
  display: flex;
}

.search-box input {
  border: none;
  outline: none;
  font: inherit;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: transparent;
  width: min(240px, 50vw);
  padding: 4px 2px;
}

/* hamburger (mobile) */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  position: relative;
  z-index: 130;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  position: absolute;
  left: 8px;
  width: 24px;
  height: 2px;
  background: var(--primary);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle span {
  top: 19px;
}

.nav-toggle span::before {
  top: -7px;
  left: 0;
}

.nav-toggle span::after {
  top: 7px;
  left: 0;
}

body.nav-open .nav-toggle span {
  background: transparent;
}

body.nav-open .nav-toggle span::before {
  transform: translateY(7px) rotate(45deg);
}

body.nav-open .nav-toggle span::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- bố cục trang ---------- */
main.page {
  padding: clamp(18px, 3vw, 40px) var(--gutter) 80px;
  min-height: calc(100vh - var(--header-h));
}

main.page.page--detail {
  padding-top: 0 !important;
}

body.page-template-template-gateway {
  padding: 0;
}


.page-title {
  margin-bottom: 28px;
}

.page-title .en {
  font-size: clamp(24px, 3.2vw, 34px);
  letter-spacing: 0.12em;
  font-weight: 600;
}

.page-title .vi {
  font-size: clamp(15px, 2vw, 19px);
  letter-spacing: 0.1em;
  margin-top: 2px;
}

/* ---------- scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-slow), transform 0.9s var(--ease-slow);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- responsive header ---------- */
@media (max-width: 1023px) {
  :root {
    --header-h: 64px;
  }

  .brand__name {
    font-size: 15px;
  }
}

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    background: var(--bg);
    flex-direction: column;
    justify-content: center;
    gap: 30px;
    transform: translateX(100%);
    transition: transform 0.4s var(--ease-slow);
    z-index: 120;
  }

  body.nav-open .site-nav {
    transform: none;
  }

  body.nav-open {
    overflow: hidden;
  }

  .site-nav a {
    font-size: 16px;
  }
}