/* ════════════════════════════════════════════════════════
   YCFONE Technology — Company Website Stylesheet
   ════════════════════════════════════════════════════════ */

/* ── CSS Variables ──────────────────────────────────────── */
:root {
  --navy:       #0d1f3c;
  --navy-mid:   #14315e;
  --navy-light: #1e4a8a;
  --cyan:       #00b4d8;
  --cyan-light: #48cae4;
  --cyan-dark:  #0096b7;
  --white:      #ffffff;
  --gray-50:    #f8fafc;
  --gray-100:   #f0f4f8;
  --gray-200:   #e2e8f0;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-800:   #1e293b;
  --text:       #1a202c;
  --text-mid:   #4a5568;

  --font-zh: 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
  --font-en: 'Inter', 'Segoe UI', sans-serif;

  --nav-h: 68px;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.10);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.16);

  --transition: .35s cubic-bezier(.4,0,.2,1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font-zh);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Section Layout ─────────────────────────────────────── */
.section {
  padding: 100px 0;
}
.section-dark {
  background: var(--navy);
  color: var(--white);
}
.section-dark .section-title,
.section-dark .section-label { color: var(--white); }

.section-label {
  font-family: var(--font-en);
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.3;
  margin-bottom: 48px;
}

/* ── Fade-up Animation ──────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s var(--transition), transform .7s var(--transition);
}
.fade-up.visible {
  opacity: 1;
  transform: none;
}
.delay-1 { transition-delay: .12s; }
.delay-2 { transition-delay: .24s; }
.delay-3 { transition-delay: .36s; }
.delay-4 { transition-delay: .48s; }

/* ── NAVBAR ─────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(13, 31, 60, .92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.07);
  transition: background var(--transition), box-shadow var(--transition);
}
#navbar.scrolled {
  background: rgba(13, 31, 60, .98);
  box-shadow: var(--shadow);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.logo-zh {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: .04em;
}
.logo-en {
  font-family: var(--font-en);
  font-size: .78rem;
  font-weight: 500;
  color: var(--cyan);
  letter-spacing: .12em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: .92rem;
  font-weight: 400;
  color: rgba(255,255,255,.78);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--white); }

.btn-nav {
  padding: 8px 20px;
  border: 1.5px solid var(--cyan);
  border-radius: 100px;
  color: var(--cyan) !important;
  font-weight: 500;
  font-size: .88rem !important;
  transition: background var(--transition), color var(--transition) !important;
}
.btn-nav:hover {
  background: var(--cyan);
  color: var(--navy) !important;
}

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

.mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 12px 0 20px;
}
.mobile-menu.open { display: flex; }
.mobile-link {
  padding: 12px 28px;
  font-size: .95rem;
  color: rgba(255,255,255,.85);
  transition: color var(--transition), background var(--transition);
}
.mobile-link:hover { color: var(--cyan); background: rgba(255,255,255,.04); }

/* ── HERO ───────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--navy);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 40%, rgba(0,180,216,.18) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 10% 80%, rgba(30,74,138,.35) 0%, transparent 55%),
    linear-gradient(135deg, #0d1f3c 0%, #071428 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,180,216,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,180,216,.07) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 50%, black 30%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: var(--nav-h);
}

.hero-eyebrow {
  font-family: var(--font-en);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  letter-spacing: .04em;
  margin-bottom: 24px;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 300;
  color: rgba(255,255,255,.9);
  letter-spacing: .06em;
  margin-bottom: 8px;
}

.hero-sub {
  font-family: var(--font-en);
  font-size: .9rem;
  color: var(--cyan-light);
  letter-spacing: .12em;
  margin-bottom: 40px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: var(--cyan);
  color: var(--navy);
  font-weight: 700;
  font-size: .95rem;
  border-radius: 100px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(0,180,216,.4);
}
.btn-primary:hover {
  background: var(--cyan-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,180,216,.5);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}
.scroll-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: bounce 1.8s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); opacity: .9; }
  50%       { transform: translateY(10px); opacity: .3; }
}

/* ── ABOUT ──────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  font-size: 1rem;
  color: var(--text-mid);
  margin-bottom: 20px;
  line-height: 1.85;
}
.about-text strong { color: var(--navy); font-weight: 600; }
.about-en {
  font-family: var(--font-en);
  font-size: .9rem !important;
  color: var(--gray-400) !important;
  border-left: 3px solid var(--cyan);
  padding-left: 14px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--cyan);
}
.stat-icon {
  font-size: 2rem;
  margin-bottom: 10px;
  line-height: 1;
}
.stat-label {
  font-size: .95rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 2px;
}
.stat-sub {
  font-family: var(--font-en);
  font-size: .72rem;
  color: var(--cyan-dark);
  letter-spacing: .06em;
}

/* ── SERVICES ───────────────────────────────────────────── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.09);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.service-card:hover {
  background: rgba(255,255,255,.07);
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.service-icon-wrap {
  width: 56px;
  height: 56px;
  color: var(--cyan);
  margin-bottom: 20px;
}
.service-icon-wrap svg { width: 100%; height: 100%; }

.service-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 20px;
}
.service-title span {
  font-family: var(--font-en);
  font-size: .75rem;
  font-weight: 400;
  color: var(--cyan-light);
  letter-spacing: .08em;
  display: block;
  margin-top: 2px;
}

.service-list li {
  font-size: .9rem;
  color: rgba(255,255,255,.72);
  padding: 7px 0;
  border-bottom: 1px solid rgba(255,255,255,.06);
  padding-left: 14px;
  position: relative;
}
.service-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}
.service-list li:last-child { border-bottom: none; }

/* ── INDUSTRIES ─────────────────────────────────────────── */
.industry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.industry-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.industry-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--cyan);
}

.industry-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}
.industry-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  color: var(--navy-light);
  background: linear-gradient(135deg, var(--gray-100), var(--white));
  border-radius: 14px;
  padding: 12px;
  border: 1px solid var(--gray-200);
}
.industry-icon svg { width: 100%; height: 100%; }

.industry-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2px;
}
.industry-en {
  font-family: var(--font-en);
  font-size: .78rem;
  color: var(--cyan-dark);
  letter-spacing: .1em;
}

.industry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.tag {
  display: inline-block;
  padding: 4px 13px;
  background: rgba(0,180,216,.08);
  border: 1px solid rgba(0,180,216,.25);
  border-radius: 100px;
  font-size: .78rem;
  color: var(--cyan-dark);
  font-weight: 500;
}

.industry-desc {
  font-size: .92rem;
  color: var(--text-mid);
  line-height: 1.8;
}

/* ── CONTACT ────────────────────────────────────────────── */
.contact-intro {
  font-size: 1rem;
  color: rgba(255,255,255,.65);
  margin-bottom: 48px;
  margin-top: -28px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.09);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: background var(--transition), border-color var(--transition);
}
.contact-card:hover {
  background: rgba(255,255,255,.08);
  border-color: var(--cyan);
}

.contact-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-label {
  font-family: var(--font-en);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--cyan-light);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.contact-info a {
  font-size: .98rem;
  font-weight: 500;
  color: var(--white);
  transition: color var(--transition);
}
.contact-info a:hover { color: var(--cyan); }
.contact-info span {
  font-size: .95rem;
  color: rgba(255,255,255,.85);
}
.addr-en {
  font-family: var(--font-en);
  font-size: .78rem !important;
  color: rgba(255,255,255,.45) !important;
  margin-top: 4px;
}

/* ── FOOTER ─────────────────────────────────────────────── */
#footer {
  background: #071428;
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer-logo .logo-zh {
  font-size: .95rem;
  font-weight: 600;
  color: var(--white);
}
.footer-logo .logo-en {
  font-family: var(--font-en);
  font-size: .72rem;
  color: var(--cyan);
  letter-spacing: .1em;
}
.footer-tax {
  font-size: .72rem;
  color: var(--gray-400);
  margin-top: 2px;
}

.footer-copy {
  font-family: var(--font-en);
  font-size: .78rem;
  color: var(--gray-400);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  /* Nav */
  .nav-links { display: none; }
  .hamburger { display: flex; }

  /* Hero */
  .hero-title { font-size: clamp(2.2rem, 10vw, 3.2rem); }

  /* About */
  .about-grid { grid-template-columns: 1fr; gap: 40px; }

  /* Services */
  .services-grid { grid-template-columns: 1fr; }

  /* Industries */
  .industry-grid { grid-template-columns: 1fr; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr 1fr; }
  .contact-card { padding: 20px; }
}