/* August Technologies — company site
   Distinct from tools.4x.hk (IBM Plex / teal utilitarian) */

:root {
  --bg: #f7f4ef;
  --bg-elev: #ffffff;
  --ink: #161513;
  --muted: #5e5a52;
  --line: #e5dfd4;
  --accent: #c45c26;
  --accent-hover: #a84b1c;
  --accent-soft: rgba(196, 92, 38, 0.12);
  --deep: #1e3a5f;
  --deep-soft: rgba(30, 58, 95, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(22, 21, 19, 0.04), 0 12px 32px rgba(22, 21, 19, 0.06);
  --wrap: min(1120px, calc(100% - 2.5rem));
  --font: "Outfit", "Noto Sans TC", system-ui, sans-serif;
  --font-display: "Fraunces", "Noto Serif TC", Georgia, serif;
  --header-h: 4.25rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 8% -8%, rgba(196, 92, 38, 0.07) 0%, transparent 55%),
    radial-gradient(700px 380px at 100% 0%, rgba(30, 58, 95, 0.06) 0%, transparent 50%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); }
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
h1, h2, h3, .display {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}
h1 { font-size: clamp(2.1rem, 5vw, 3.35rem); }
h2 { font-size: clamp(1.65rem, 3.2vw, 2.25rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
.muted { color: var(--muted); }
.wrap { width: var(--wrap); margin-inline: auto; }

/* Skip link */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 100;
  background: var(--deep);
  color: #fff;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus {
  top: 1rem;
  color: #fff;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Language: show zh by default; .lang-en on html flips */
[data-lang="en"] { display: none !important; }
html.lang-en [data-lang="zh"] { display: none !important; }
html.lang-en [data-lang="en"] { display: revert !important; }
html.lang-en span[data-lang="en"],
html.lang-en a[data-lang="en"],
html.lang-en strong[data-lang="en"] { display: inline !important; }
html.lang-en p[data-lang="en"],
html.lang-en li[data-lang="en"],
html.lang-en h1[data-lang="en"],
html.lang-en h2[data-lang="en"],
html.lang-en h3[data-lang="en"],
html.lang-en div[data-lang="en"],
html.lang-en label[data-lang="en"] { display: block !important; }
span[data-lang="zh"], a[data-lang="zh"], strong[data-lang="zh"] { display: inline; }
p[data-lang="zh"], li[data-lang="zh"], h1[data-lang="zh"], h2[data-lang="zh"],
h3[data-lang="zh"], div[data-lang="zh"], label[data-lang="zh"] { display: block; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 244, 239, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 20px rgba(22, 21, 19, 0.04);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}
.brand:hover { color: inherit; }
.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--deep), #0f2744);
  color: #fff;
  display: grid;
  place-items: center;
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.04em;
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-text strong { font-size: 0.98rem; font-weight: 650; }
.brand-text span { font-size: 0.72rem; color: var(--muted); font-weight: 500; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem 1.35rem;
}
.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--accent); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.lang-toggle {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  min-height: 2.5rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}
.lang-toggle:hover { color: var(--ink); border-color: #d2cbc0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.2rem;
  min-height: 2.75rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: #cfc7ba; color: var(--ink); background: rgba(255,255,255,0.55); }
.btn-ghost-on-dark {
  background: transparent;
  color: #f7f4ef;
  border-color: rgba(247, 244, 239, 0.35);
}
.btn-ghost-on-dark:hover {
  border-color: rgba(247, 244, 239, 0.65);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}
.btn-deep {
  background: var(--deep);
  color: #fff;
}
.btn-deep:hover { background: #162d4a; color: #fff; }

.menu-btn {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.menu-btn span {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.menu-btn span::before,
.menu-btn span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--ink);
}
.menu-btn span::before { top: -5px; }
.menu-btn span::after { top: 5px; }
.menu-btn[aria-expanded="true"] span { background: transparent; }
.menu-btn[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* Hero */
.hero {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(2rem, 4vw, 3rem);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.lead {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--muted);
  max-width: 38rem;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}
.hero-note {
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.hero-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
.hero-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--deep));
}
.hero-card h3 { margin-bottom: 0.35rem; }
.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 1.25rem;
}
.stat {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}
.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--deep);
}
.stat span { font-size: 0.82rem; color: var(--muted); }

/* Sections */
.section { padding: clamp(2.5rem, 5vw, 4rem) 0; }
.section-alt { background: #f1ebe3; border-block: 1px solid var(--line); }
.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.section-head p { max-width: 34rem; color: var(--muted); margin: 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset;
}
.card-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.15rem;
}
.card-icon.deep { background: var(--deep-soft); color: var(--deep); }
.card h3 { margin-bottom: 0.45rem; }
.card p { color: var(--muted); font-size: 0.98rem; }
.card ul {
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
}
.card li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--accent);
}

.work-list {
  display: grid;
  gap: 0.85rem;
}
.work-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  color: inherit;
  text-decoration: none;
}
a.work-item:hover {
  border-color: #d2cbc0;
  color: inherit;
  box-shadow: var(--shadow);
}
.work-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--deep);
  background: var(--deep-soft);
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  white-space: nowrap;
}
.work-item h3 { margin: 0 0 0.2rem; font-size: 1.1rem; color: var(--ink); }
.work-item p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.work-arrow { color: var(--muted); font-size: 1.2rem; }

.cta-band {
  background: linear-gradient(135deg, #1e3a5f 0%, #142848 55%, #1a2f28 100%);
  color: #f7f4ef;
  border-radius: calc(var(--radius) + 6px);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
}
.cta-band h2 { color: #fff; margin-bottom: 0.35rem; }
.cta-band p { color: rgba(247, 244, 239, 0.78); margin: 0; max-width: 36rem; }
.cta-band .btn-primary { background: var(--accent); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 0.65rem; }

/* Page hero (inner) */
.page-hero {
  padding: clamp(2rem, 5vw, 3.25rem) 0 0.5rem;
}
.page-hero .lead { margin-bottom: 0; }

/* About */
.prose { max-width: 42rem; }
.prose h2 { margin-top: 2rem; }
.values {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}
.value {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
}
.value strong { display: block; margin-bottom: 0.35rem; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 1.5rem;
  align-items: start;
}
.contact-panel {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.contact-panel h2 { margin-bottom: 0.5rem; }
.contact-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}
.contact-list li {
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}
.contact-list .label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}
.contact-list a { color: var(--ink); text-decoration: none; font-weight: 600; }
.contact-list a:hover { color: var(--accent); }
.mailto-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.form label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}
.form .field { margin-bottom: 1rem; }
.form input,
.form textarea,
.form select {
  width: 100%;
  font: inherit;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
}
.form input:focus,
.form textarea:focus,
.form select:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}
.form textarea { min-height: 8rem; resize: vertical; }
.form-note { font-size: 0.85rem; color: var(--muted); margin-top: 0.75rem; }
.form-status {
  display: none;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--deep-soft);
  color: var(--deep);
  font-size: 0.92rem;
}
.form-status.show { display: block; }

/* Footer */
.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.25rem;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
}
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }
.footer-legal { margin-top: 1.25rem; font-size: 0.82rem; }

/* Mobile */
@media (max-width: 860px) {
  .hero-grid,
  .cards,
  .contact-grid,
  .values { grid-template-columns: 1fr; }
  .work-item { grid-template-columns: 1fr; }
  .work-arrow { display: none; }
  .menu-btn { display: inline-flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(247, 244, 239, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.25rem 1rem;
    box-shadow: 0 12px 24px rgba(22, 21, 19, 0.06);
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.85rem 0.2rem;
    min-height: 2.75rem;
    border-bottom: 1px solid var(--line);
  }
  .nav-links a:last-child { border-bottom: 0; }
  .nav { position: relative; }
  .nav-actions .btn-primary { display: none; }
}
@media (max-width: 520px) {
  .stat-row { grid-template-columns: 1fr; }
  .brand-text span { display: none; }
  :root { --wrap: min(1120px, calc(100% - 1.75rem)); }
}


/* Free tools cross-link (SEO / traffic) */
.tools-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}
.tool-chip {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.tool-chip:hover {
  border-color: var(--accent);
  color: inherit;
  transform: translateY(-1px);
}
.tool-chip strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink);
}
.tool-chip span {
  font-size: 0.88rem;
  color: var(--muted);
}
@media (max-width: 900px) {
  .tools-links { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .tools-links { grid-template-columns: 1fr; }
}