/*
 * ELVONIS DESIGN SYSTEM — elvonis-style.css
 * ---------------------------------------------------------------
 * Fonts (all open-source / SIL OFL, free for commercial use):
 *   EN:  "Plus Jakarta Sans"   — open source, Google Fonts
 *   ZH:  "Noto Sans SC"        — open source, Google Fonts (covers all CJK)
 *   Mono:"DM Mono"             — open source, Google Fonts
 *
 * These three replace Inter so that Chinese visitors get
 * proper CJK glyph rendering on every OS.
 * ---------------------------------------------------------------
 */

/* ── VARIABLES ─────────────────────────────────────────────── */
:root {
  --navy:       #1a2a3a;
  --navy-lt:    #223347;
  --navy-dk:    #0f1b27;
  --blue:       #2563eb;   /* accent / CTA hover */
  --blue-lt:    #3b82f6;
  --gold:       #c8a06e;
  --gold-lt:    #dbb98a;
  --white:      #ffffff;
  --off-white:  #f8f9fb;
  --gray-50:    #f9fafb;
  --gray-100:   #f3f4f6;
  --gray-200:   #e5e7eb;
  --gray-400:   #9ca3af;
  --gray-500:   #6b7280;
  --gray-600:   #4b5563;
  --gray-700:   #374151;
  --gray-900:   #111827;
  --green:      #16a34a;
  --wa-green:   #25d366;

  /* Typography scale */
  --text-xs:    0.75rem;   /* 12px */
  --text-sm:    0.875rem;  /* 14px */
  --text-base:  1rem;      /* 16px */
  --text-lg:    1.125rem;  /* 18px */
  --text-xl:    1.25rem;   /* 20px */
  --text-2xl:   1.5rem;    /* 24px */
  --text-3xl:   1.875rem;  /* 30px */
  --text-4xl:   2.25rem;   /* 36px */
  --text-5xl:   3rem;      /* 48px */
  --text-6xl:   3.75rem;   /* 60px */
  --text-7xl:   4.5rem;    /* 72px */

  /* Spacing tokens */
  --section-y:  6rem;
}

/* ── RESET ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* ── BASE TYPOGRAPHY ──────────────────────────────────────── */
body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', system-ui, sans-serif;
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--gray-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Chinese content gets Noto Sans SC weight boost */
html[lang="zh"] body {
  font-family: 'Noto Sans SC', 'Plus Jakarta Sans', system-ui, sans-serif;
  letter-spacing: 0.01em;
}
html[lang="zh"] h1,
html[lang="zh"] h2,
html[lang="zh"] h3,
html[lang="zh"] h4 {
  font-weight: 700;
  letter-spacing: 0.02em;
}
/* Chinese text doesn't need uppercase transforms */
html[lang="zh"] .uppercase,
html[lang="zh"] .tracking-widest {
  text-transform: none !important;
  letter-spacing: 0.05em !important;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }

/* ── BILINGUAL SHOW/HIDE ──────────────────────────────────── */
html[lang="en"] .lang-zh { display: none !important; }
html[lang="zh"] .lang-en { display: none !important; }

/* ── LANGUAGE PILL BUTTONS ───────────────────────────────── */
.lang-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid var(--gray-200);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  cursor: pointer;
  background: transparent;
}
.lang-pill-active {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.lang-pill-inactive {
  color: var(--gray-400);
}
.lang-pill-inactive:hover {
  color: var(--navy);
  border-color: var(--gray-400);
}

/* ── NAVBAR ──────────────────────────────────────────────── */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--gray-100);
  transition: box-shadow 0.2s;
}
.nav-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav-logo {
  font-size: 1.375rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  flex-shrink: 0;
  line-height: 1;
}
.nav-links {
  display: none;
  gap: 2.5rem;
  list-style: none;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
}
html[lang="zh"] .nav-links {
  letter-spacing: 0.05em;
  text-transform: none;
}
.nav-links a:hover { color: var(--navy); }
.nav-links a.active { color: var(--navy); border-bottom: 2px solid var(--navy); padding-bottom: 2px; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  background: var(--navy);
  color: var(--white);
  padding: 0.55rem 1.25rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 2px solid var(--navy);
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--blue); border-color: var(--blue); }

/* Mobile toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  transition: 0.3s;
}

/* Mobile drawer */
#mobile-drawer {
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  padding: 1.5rem;
  z-index: 49;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}
#mobile-drawer.hidden { display: none; }
#mobile-drawer nav a {
  display: block;
  padding: 0.875rem 0;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
  transition: color 0.15s;
}
html[lang="zh"] #mobile-drawer nav a {
  text-transform: none;
  letter-spacing: 0.05em;
}
#mobile-drawer nav a:hover { color: var(--navy); }
.drawer-lang-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.25rem;
}
[data-lang-drawer] {
  flex: 1;
  padding: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
  border: 1px solid var(--gray-200);
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
[data-lang-drawer].active {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

@media (min-width: 1024px) {
  .nav-links { display: flex; }
  .menu-toggle { display: none; }
  #mobile-drawer { display: none !important; }
}

/* ── FOOTER ──────────────────────────────────────────────── */
.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,0.65);
  border-top: 4px solid var(--blue);
}
.footer-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 4rem 1.5rem 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 640px)  { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1.2fr; } }

.footer-logo {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--white);
  display: block;
  margin-bottom: 1rem;
}
.footer-tagline {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: rgba(255,255,255,0.5);
  max-width: 22rem;
}
.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 1.25rem;
}
html[lang="zh"] .footer-col-title {
  text-transform: none;
  letter-spacing: 0.05em;
  font-size: var(--text-sm);
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.625rem; }
.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.55);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--gold-lt); }

.footer-email-form {
  display: flex;
  margin-bottom: 1.25rem;
}
.footer-email-input {
  flex: 1;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--white);
  padding: 0.625rem 1rem;
  font-size: var(--text-sm);
  outline: none;
  transition: border-color 0.2s;
  min-width: 0;
}
.footer-email-input::placeholder { color: rgba(255,255,255,0.35); }
.footer-email-input:focus { border-color: var(--blue-lt); }
.footer-email-btn {
  background: var(--blue);
  color: var(--white);
  padding: 0.625rem 1rem;
  font-size: var(--text-sm);
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}
.footer-email-btn:hover { background: var(--blue-lt); }

.footer-bottom {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.3);
}
@media (min-width: 640px) {
  .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
}
.footer-bottom a { color: rgba(255,255,255,0.3); transition: color 0.15s; }
.footer-bottom a:hover { color: var(--white); }

/* Certs strip in footer */
.cert-pills { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1.25rem; }
.cert-pill {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 0.25rem 0.625rem;
}

/* Social icons */
.social-icons { display: flex; gap: 0.625rem; margin-top: 1rem; }
.social-icon {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.social-icon:hover { background: var(--blue); }
.social-icon svg { width: 1rem; height: 1rem; fill: white; }

/* ── WHATSAPP FLOAT ──────────────────────────────────────── */
.wa-float {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
}
.wa-float-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  background: var(--wa-green);
  color: white;
  box-shadow: 0 4px 20px rgba(37,211,102,0.4);
  transition: transform 0.2s;
}
.wa-float-btn:hover { transform: scale(1.1); }
.wa-float-btn svg { width: 1.625rem; height: 1.625rem; fill: white; }
.wa-tooltip {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  right: 0;
  background: var(--navy);
  color: white;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.5rem 0.875rem;
  white-space: nowrap;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 0.2s, transform 0.2s;
}
.wa-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  right: 1rem;
  border: 5px solid transparent;
  border-top-color: var(--navy);
}
.wa-float:hover .wa-tooltip {
  opacity: 1;
  transform: translateY(0);
}

/* ── TRUST BAR ───────────────────────────────────────────── */
.trust-bar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  padding: 1.5rem 0;
}
.trust-bar-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  align-items: center;
  justify-content: center;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-400);
}
html[lang="zh"] .trust-item {
  text-transform: none;
  letter-spacing: 0.05em;
  font-size: var(--text-sm);
}
.trust-item svg { width: 1rem; height: 1rem; color: var(--green); }
.trust-divider {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gray-300);
}

/* ── PAGE HERO (inner pages) ─────────────────────────────── */
.page-hero {
  background: var(--navy);
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 65% 40%, rgba(37,99,235,0.12) 0%, transparent 70%);
}
.page-hero-inner {
  position: relative;
  max-width: 48rem;
  margin: 0 auto;
}
.page-hero .eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue-lt);
  margin-bottom: 1rem;
}
html[lang="zh"] .page-hero .eyebrow {
  text-transform: none;
  letter-spacing: 0.06em;
}
.page-hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.12;
  margin-bottom: 1rem;
}
.page-hero p {
  font-size: var(--text-lg);
  font-weight: 300;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  max-width: 36rem;
  margin: 0 auto;
}

/* ── SECTION UTILITY ─────────────────────────────────────── */
.section { padding: var(--section-y) 0; }
.section-sm { padding: 3rem 0; }
.container { max-width: 80rem; margin: 0 auto; padding: 0 1.5rem; }
.container-md { max-width: 56rem; margin: 0 auto; padding: 0 1.5rem; }
.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  display: block;
  margin-bottom: 0.75rem;
}
html[lang="zh"] .section-label {
  text-transform: none;
  letter-spacing: 0.06em;
  font-size: var(--text-sm);
}
.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--navy);
  line-height: 1.15;
}
.section-sub {
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--gray-500);
  line-height: 1.75;
  max-width: 38rem;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.875rem 1.75rem;
  border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  cursor: pointer;
  white-space: nowrap;
  line-height: 1;
}
html[lang="zh"] .btn {
  text-transform: none;
  letter-spacing: 0.06em;
  font-size: var(--text-sm);
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-primary:hover { background: var(--blue); border-color: var(--blue); }
.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn-outline:hover { background: var(--navy); color: var(--white); }
.btn-white {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}
.btn-white:hover { background: var(--off-white); }
.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline-white:hover { background: var(--white); color: var(--navy); border-color: var(--white); }
.btn-blue {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn-blue:hover { background: var(--blue-lt); border-color: var(--blue-lt); }

/* ── PRODUCT CARD ────────────────────────────────────────── */
.product-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.3s, border-color 0.3s;
  overflow: hidden;
  position: relative;
}
.product-card:hover {
  box-shadow: 0 16px 48px rgba(0,0,0,0.1);
  border-color: var(--gray-200);
}
.product-card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--gray-100);
  position: relative;
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.product-card:hover .product-card-img img { transform: scale(1.05); }
/* Placeholder when no image */
.product-card-img .img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--navy-dk) 0%, var(--navy) 100%);
}
.product-card-img .img-placeholder svg { color: rgba(255,255,255,0.3); }
.product-card-img .img-placeholder span {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.product-card-body { padding: 1.75rem; flex: 1; display: flex; flex-direction: column; }
.product-card-cat {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.5rem;
}
html[lang="zh"] .product-card-cat {
  text-transform: none;
  letter-spacing: 0.05em;
}
.product-card-title {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 0.5rem;
  line-height: 1.25;
}
.product-card-sub {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-bottom: 1.25rem;
  line-height: 1.6;
  flex: 1;
}
.product-card-arrow {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--navy);
  margin-top: auto;
  transition: gap 0.2s;
}
html[lang="zh"] .product-card-arrow {
  text-transform: none;
  letter-spacing: 0.04em;
}
.product-card:hover .product-card-arrow { gap: 0.625rem; }
.product-card-arrow svg { width: 1rem; height: 1rem; }

/* Dark product card variant */
.product-card.dark {
  background: var(--navy);
  border-color: rgba(255,255,255,0.08);
}
.product-card.dark .product-card-title { color: var(--white); }
.product-card.dark .product-card-sub   { color: rgba(255,255,255,0.5); }
.product-card.dark .product-card-arrow { color: var(--blue-lt); }

/* ── OEM / FEATURE CARDS ─────────────────────────────────── */
.feature-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.feature-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: rgba(37,99,235,0.08);
  border: 1px solid rgba(37,99,235,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.feature-icon svg { width: 1.125rem; height: 1.125rem; color: var(--blue); }
.feature-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.25rem;
}
.feature-desc {
  font-size: var(--text-sm);
  color: var(--gray-500);
  line-height: 1.65;
}

/* ── FORM ELEMENTS ───────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
.form-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-500);
}
html[lang="zh"] .form-label { text-transform: none; letter-spacing: 0.04em; font-size: var(--text-sm); }
.form-input, .form-select, .form-textarea {
  width: 100%;
  border: 1px solid var(--gray-200);
  background: var(--gray-50);
  color: var(--gray-900);
  padding: 0.75rem 1rem;
  font-size: var(--text-sm);
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--navy);
  background: var(--white);
}
.form-textarea { resize: vertical; min-height: 7rem; }
.form-select { appearance: none; cursor: pointer; }

/* ── STAT NUMBERS ────────────────────────────────────────── */
.stat-num {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--navy);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-400);
  margin-top: 0.375rem;
}
html[lang="zh"] .stat-label { text-transform: none; letter-spacing: 0.05em; font-size: var(--text-sm); }

/* ── SCROLL REVEAL ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: none;
}

/* ── UTILITY ─────────────────────────────────────────────── */
.divider { width: 2.5rem; height: 2px; background: var(--blue); margin: 1rem 0; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
}
.badge-blue {
  background: rgba(37,99,235,0.1);
  color: var(--blue);
  border: 1px solid rgba(37,99,235,0.2);
}
.badge-navy {
  background: rgba(26,42,58,0.08);
  color: var(--navy);
  border: 1px solid rgba(26,42,58,0.15);
}
.badge-green {
  background: rgba(22,163,74,0.08);
  color: var(--green);
  border: 1px solid rgba(22,163,74,0.2);
}