/* ================================================================
   AISkill.US — Main Site Stylesheet
   All shared styles for every frontend page
   ================================================================ */

/* ── Google Fonts Import ───────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,600;0,700;1,600&family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  --primary:        #0066cc;
  --primary-dark:   #004fa3;
  --primary-light:  #e6f1fb;
  --accent:         #00b478;
  --accent-2:       #0a9e6e;
  --navy:           #0a1628;
  --navy-mid:       #0a2a4a;
  --text:           #1a2332;
  --text-muted:     #6b7280;
  --gray-50:        #f8f9fa;
  --gray-100:       #f1f3f5;
  --gray-200:       #e5e7eb;
  --white:          #ffffff;
  --font-serif:     'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm:      8px;
  --radius-md:      12px;
  --radius-lg:      16px;
  --radius-xl:      24px;
  --shadow-sm:      0 2px 8px rgba(0,0,0,.06);
  --shadow-md:      0 4px 20px rgba(0,0,0,.1);
  --shadow-lg:      0 16px 48px rgba(0,0,0,.14);
  --transition:     .25s cubic-bezier(.4,0,.2,1);
}

/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.25;
  color: var(--navy);
}
h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; margin-bottom: 12px; }
h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
h5 { font-size: .95rem; font-weight: 600; margin-bottom: 4px; }
p  { margin-bottom: .75rem; color: var(--text-muted); line-height: 1.7; }
p:last-child { margin-bottom: 0; }

/* ── Layout ───────────────────────────────────────────────── */
.container   { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section     { padding: 80px 0; }
.section-sm  { padding: 56px 0; }
.text-center { text-align: center; }
.d-flex      { display: flex; }
.gap-1       { gap: 8px; }
.gap-2       { gap: 16px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 32px; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}
.section-header p { font-size: 1.05rem; color: var(--text-muted); }

/* ── Section Label ────────────────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(0,102,204,.18);
  border-radius: 100px;
  padding: 5px 14px;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 18px;
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:hover  { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: var(--white); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); box-shadow: 0 6px 18px rgba(0,102,204,.3); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-dark   { background: var(--navy); color: var(--white); border-color: var(--navy); }
.btn-dark:hover { background: #0d1e35; box-shadow: 0 6px 18px rgba(10,22,40,.3); }
.btn-sm  { padding: 8px 18px; font-size: .85rem; }
.btn-lg  { padding: 13px 28px; font-size: 1rem; border-radius: var(--radius-lg); }

/* ── NAVBAR ───────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 24px;
  transition: all var(--transition);
}
.navbar.scrolled {
  background: rgba(10,22,40,.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 4px 24px rgba(0,0,0,.2);
}
.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: white;
  letter-spacing: -.01em;
}
.navbar-logo-icon {
  width: 38px; height: 38px;
  background: var(--primary);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.navbar-nav a {
  color: rgba(255,255,255,.78);
  font-size: .88rem;
  font-weight: 500;
  padding: 7px 13px;
  border-radius: 8px;
  transition: all var(--transition);
  font-family: var(--font-sans);
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: white;
  background: rgba(255,255,255,.1);
}
.navbar-actions { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
}

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 60%, #0a3d6b 100%);
  color: var(--white);
  padding: 100px 0 120px;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 100px;
  padding: 6px 18px;
  font-size: .82rem;
  font-weight: 500;
  color: rgba(255,255,255,.9);
  margin-bottom: 28px;
  letter-spacing: .03em;
}
.hero h1 { color: var(--white); margin-bottom: 20px; }
.hero h1 em { font-style: italic; color: rgba(255,255,255,.75); }
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.72);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }
.hero .btn-outline { color: var(--white); border-color: rgba(255,255,255,.4); background: rgba(255,255,255,.07); }
.hero .btn-outline:hover { background: rgba(255,255,255,.15); border-color: rgba(255,255,255,.6); }

/* ── PAGE HERO (inner pages) ──────────────────────────────── */
.page-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  padding: 110px 0 60px;
  text-align: center;
}
.page-hero h1 { color: white; margin-bottom: 12px; font-size: clamp(1.8rem, 4vw, 2.8rem); }
.page-hero p  { color: rgba(255,255,255,.65); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: .83rem;
  color: rgba(255,255,255,.5);
  font-family: var(--font-sans);
}
.breadcrumb a { color: var(--accent); }
.breadcrumb span { color: rgba(255,255,255,.3); }

/* ── Alerts ───────────────────────────────────────────────── */
.alert {
  padding: 13px 18px;
  border-radius: var(--radius-md);
  font-size: .9rem;
  margin-bottom: 18px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-family: var(--font-sans);
}
.alert-success { background: rgba(0,180,120,.08); color: #0a9e6e; border: 1px solid rgba(0,180,120,.2); }
.alert-error   { background: rgba(239,68,68,.08);  color: #dc2626; border: 1px solid rgba(239,68,68,.2); }
.alert-info    { background: rgba(0,102,204,.08);  color: var(--primary); border: 1px solid rgba(0,102,204,.2); }
.alert ul { margin: 6px 0 0 0; padding-left: 18px; }
.alert ul li { margin-bottom: 2px; }

/* ── Service Cards ────────────────────────────────────────── */
.service-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover { box-shadow: var(--shadow-md); transform: translateY(-5px); border-color: rgba(0,102,204,.15); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 52px; height: 52px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
  font-size: 1.3rem;
  margin-bottom: 18px;
}
.service-card h3 { color: var(--navy); margin-bottom: 10px; }
.service-card p  { font-size: .92rem; color: var(--text-muted); margin-bottom: 16px; }
.service-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--primary); font-weight: 600; font-size: .88rem;
  transition: gap var(--transition);
}
.service-link:hover { gap: 10px; }

/* ── Research Cards ───────────────────────────────────────── */
.research-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.research-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.research-card-img {
  height: 180px;
  background: var(--gray-100);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  overflow: hidden;
}
.research-card-img img { width: 100%; height: 100%; object-fit: cover; }
.research-card-body    { padding: 22px 20px; }
.research-category {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 100px;
  padding: 3px 12px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 12px;
}
.research-card-body h4 { color: var(--navy); margin-bottom: 8px; font-size: 1rem; }
.research-card-body p  { font-size: .88rem; color: var(--text-muted); }

/* ── Team Cards ───────────────────────────────────────────── */
.team-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}
.team-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.team-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  font-size: 1.8rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 18px;
  overflow: hidden;
  font-family: var(--font-serif);
}
.team-avatar img { width: 100%; height: 100%; object-fit: cover; }
.team-card h4    { color: var(--navy); margin-bottom: 4px; }
.team-card .position {
  font-size: .82rem; font-weight: 600; color: var(--primary);
  text-transform: uppercase; letter-spacing: .05em; margin-bottom: 12px;
  font-family: var(--font-sans);
}
.team-card p { font-size: .88rem; color: var(--text-muted); margin-bottom: 18px; }
.team-socials { display: flex; justify-content: center; gap: 10px; }
.team-socials a {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--gray-100); color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; transition: all var(--transition);
}
.team-socials a:hover { background: var(--primary); color: var(--white); }

/* ── CTA Section ──────────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, #e8f4fd 0%, #f0faf6 100%);
  padding: 80px 0;
  text-align: center;
}
.cta-section h2 { color: var(--navy); margin-bottom: 16px; }
.cta-section p  { color: var(--text-muted); max-width: 600px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ── FOOTER ───────────────────────────────────────────────── */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,.7);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand p { font-size: .9rem; line-height: 1.7; margin-top: 16px; }
.footer-col h5 {
  color: white;
  font-family: var(--font-sans);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: .88rem; color: rgba(255,255,255,.55); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  font-size: .82rem; color: rgba(255,255,255,.38);
  font-family: var(--font-sans);
}

/* ── ABOUT Features ───────────────────────────────────────── */
.about-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-feature {
  display: flex; align-items: flex-start; gap: 14px;
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius-md); padding: 16px 14px;
}
.about-feature-icon {
  width: 40px; height: 40px; min-width: 40px;
  border-radius: 10px; display: flex; align-items: center;
  justify-content: center; font-size: 1rem;
}
.icon-blue  { background: rgba(0,102,204,.12); color: #0066cc; }
.icon-green { background: rgba(0,180,120,.12); color: var(--accent); }
.icon-amber { background: rgba(245,166,35,.12); color: #f5a623; }
.about-feature h5 { color: var(--text); }
.about-feature p  { color: var(--text-muted); font-size: .88rem; margin: 0; }

/* ── BADGE / TAG ──────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-family: var(--font-sans);
}
.badge-blue  { background: var(--primary-light); color: var(--primary); }
.badge-green { background: rgba(0,180,120,.1); color: var(--accent); }
.badge-navy  { background: rgba(10,22,40,.08); color: var(--navy); }

/* ── Contact ──────────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 64px; align-items: start; }
.contact-detail { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 24px; }
.contact-detail-icon {
  width: 44px; height: 44px; background: var(--primary-light);
  border-radius: 10px; display: flex; align-items: center;
  justify-content: center; color: var(--primary); flex-shrink: 0;
}
.contact-detail h5 { color: var(--text); font-size: .9rem; font-family: var(--font-sans); }
.contact-detail p  { font-size: .88rem; margin: 0; }
.form-card {
  background: white; border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--shadow-sm);
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: .85rem; font-weight: 600; color: var(--text); margin-bottom: 7px; font-family: var(--font-sans); }
.form-control {
  width: 100%; padding: 11px 14px; border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm); font-family: var(--font-sans);
  font-size: .9rem; color: var(--text); background: var(--gray-50);
  outline: none; transition: all var(--transition);
}
.form-control:focus { border-color: var(--primary); background: white; box-shadow: 0 0 0 3px rgba(0,102,204,.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
textarea.form-control { resize: vertical; min-height: 120px; }

/* ── Auth ─────────────────────────────────────────────────── */
.auth-wrap { width: 100%; max-width: 420px; }
.auth-wrap-wide { width: 100%; max-width: 480px; }
.auth-logo { text-align: center; margin-bottom: 28px; }
.auth-card {
  background: white; border-radius: 20px; padding: 40px;
  box-shadow: 0 20px 60px rgba(10,22,40,.12); border: 1px solid var(--gray-200);
}
.auth-card h2 { text-align: center; margin-bottom: 6px; }
.auth-card>p  { text-align: center; margin-bottom: 28px; }
.auth-footer  { text-align: center; margin-top: 20px; font-size: .88rem; color: var(--text-muted); font-family: var(--font-sans); }
.auth-footer a { color: var(--primary); font-weight: 600; }
.input-icon { position: relative; }
.input-icon i { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: .88rem; }
.input-icon .form-control { padding-left: 38px; }
.divider { display: flex; align-items: center; gap: 12px; margin: 20px 0; color: var(--text-muted); font-size: .8rem; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--gray-200); }
.btn-full { width: 100%; justify-content: center; padding: 13px; font-size: 1rem; border-radius: var(--radius-md); margin-top: 8px; }
.back-home { display: flex; align-items: center; gap: 6px; color: var(--text-muted); font-size: .85rem; margin-bottom: 24px; justify-content: center; }
.back-home:hover { color: var(--primary); }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ── Scroll Animations ────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: .1s; }
.fade-up-delay-2 { transition-delay: .2s; }
.fade-up-delay-3 { transition-delay: .3s; }
.fade-up-delay-4 { transition-delay: .4s; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .about-wrap, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .container { padding: 0 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row, .form-row-2 { grid-template-columns: 1fr; }
  .navbar-nav { display: none; }
  .navbar-nav.open {
    display: flex; flex-direction: column;
    position: fixed; top: 68px; left: 0; right: 0;
    background: rgba(10,22,40,.98);
    padding: 16px 24px 24px;
    border-top: 1px solid rgba(255,255,255,.08); gap: 4px;
  }
  .nav-toggle { display: block; }
  .hero { padding: 80px 0 80px; }
  .hero h1 { font-size: 1.9rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .cta-actions  { flex-direction: column; align-items: center; }
  .footer-grid  { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .auth-card { padding: 28px 20px; }
}
@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.35rem; }
  .btn-lg { padding: 11px 22px; font-size: .92rem; }
}