/* =========================================================
   LAYOUT.CSS — Nav, Hero, Grid, Footer, Responsive, Animations
   PAN Portfolio v11
   ========================================================= */

/* ===================
   NAVIGATION
   =================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-sticky);
  background: rgba(var(--bg-rgb), 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--duration-base) ease, box-shadow var(--duration-base) ease;
}

.site-nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-logo-icon svg {
  width: 36px;
  height: 36px;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.nav-logo-text span {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Desktop Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 100%;
}

.nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) ease;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.nav-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) ease;
}

.nav-item:hover > .nav-link svg {
  transform: rotate(180deg);
}

/* Mega-Menu Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% - 4px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 240px;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(8px);
  transition: all var(--duration-base) var(--ease-out);
  z-index: var(--z-dropdown);
}

.nav-item:hover > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) ease;
  text-decoration: none;
}

.nav-dropdown-link:hover {
  background: var(--glass-bg);
  color: var(--text-primary);
}

.nav-dropdown-link .dd-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.nav-dropdown-link .dd-icon svg {
  width: 16px;
  height: 16px;
  color: var(--primary-light);
}

.nav-dropdown-link .dd-label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.nav-dropdown-link .dd-star {
  color: var(--accent);
  font-size: var(--text-xs);
  margin-left: var(--space-1);
}

/* Dropdown Group Headers */
.dd-group-header {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-3) var(--space-4) var(--space-1);
  margin-top: var(--space-1);
  border-top: 1px solid var(--border);
  user-select: none;
}

.dd-group-header:first-child {
  border-top: none;
  margin-top: 0;
}

.mobile-nav-group-header {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-3) 0 var(--space-1);
  margin-top: var(--space-2);
  border-top: 1px solid var(--border);
}

.mobile-nav-group-header:first-child {
  border-top: none;
  margin-top: 0;
}

/* Nav Actions (search, theme toggle) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--duration-fast) ease;
  cursor: pointer;
  background: transparent;
  border: none;
}

.nav-icon-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.nav-icon-btn svg {
  width: 20px;
  height: 20px;
}

/* Hamburger */
.hamburger-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  background: transparent;
  border: none;
}

.hamburger-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-overlay);
}

.mobile-drawer.open {
  display: block;
}

.mobile-drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.mobile-drawer-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 360px);
  background: var(--surface);
  border-left: 1px solid var(--border);
  padding: var(--space-5);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
}

.mobile-drawer.open .mobile-drawer-panel {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.mobile-drawer-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  background: transparent;
  border: none;
}

.mobile-drawer-close:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.mobile-nav-group {
  margin-bottom: var(--space-5);
}

.mobile-nav-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-2) var(--space-3);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) ease;
  text-decoration: none;
}

.mobile-nav-link:hover {
  background: var(--glass-bg);
  color: var(--text-primary);
}

.mobile-nav-link.active {
  color: var(--primary-light);
  background: rgba(46, 123, 214, 0.08);
}

/* ===================
   HERO SECTION
   =================== */
.hero-section {
  position: relative;
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-10)) var(--space-5) var(--space-10);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.hero-mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(11, 83, 148, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(46, 123, 214, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(212, 168, 67, 0.06) 0%, transparent 60%);
}

[data-theme="light"] .hero-mesh {
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(11, 83, 148, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(46, 123, 214, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(212, 168, 67, 0.03) 0%, transparent 60%);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: orbFloat 20s ease-in-out infinite;
}

.hero-orb--1 {
  width: clamp(250px, 35vw, 500px);
  height: clamp(250px, 35vw, 500px);
  background: radial-gradient(circle, rgba(11, 83, 148, 0.4) 0%, rgba(46, 123, 214, 0.1) 60%, transparent 80%);
  top: -10%;
  right: -5%;
  animation-delay: 0s;
}

.hero-orb--2 {
  width: clamp(200px, 30vw, 400px);
  height: clamp(200px, 30vw, 400px);
  background: radial-gradient(circle, rgba(212, 168, 67, 0.3) 0%, rgba(212, 168, 67, 0.05) 60%, transparent 80%);
  bottom: -5%;
  left: -5%;
  animation-delay: -10s;
}

.hero-orb--3 {
  width: clamp(150px, 20vw, 300px);
  height: clamp(150px, 20vw, 300px);
  background: radial-gradient(circle, rgba(46, 123, 214, 0.25) 0%, transparent 70%);
  top: 40%;
  left: 30%;
  animation-delay: -5s;
}

[data-theme="light"] .hero-orb {
  opacity: 0.3;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(20px, -30px) scale(1.05); }
  50%      { transform: translate(-15px, 15px) scale(0.95); }
  75%      { transform: translate(10px, 20px) scale(1.02); }
}

/* Grid overlay for hero */
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 80%);
}

[data-theme="light"] .hero-grid-overlay {
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary-light);
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-4);
  background: rgba(46, 123, 214, 0.1);
  border: 1px solid rgba(46, 123, 214, 0.2);
  border-radius: var(--radius-full);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto var(--space-6);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Separate XSIAM hero callout */
.hero-callout {
  margin-top: var(--space-6);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: rgba(212, 168, 67, 0.08);
  border: 1px solid rgba(212, 168, 67, 0.2);
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-out);
}

.hero-callout:hover {
  background: rgba(212, 168, 67, 0.12);
  border-color: rgba(212, 168, 67, 0.35);
  transform: translateY(-2px);
}

.hero-callout-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent);
}

.hero-callout-text span {
  color: var(--text-secondary);
  font-weight: 400;
}

/* ===================
   BREADCRUMB
   =================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.breadcrumb a:hover {
  color: var(--primary-light);
}

.breadcrumb-separator::after {
  content: '/';
  color: var(--text-muted);
  opacity: 0.5;
}

.breadcrumb-current {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================
   SECTIONS
   =================== */
.section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section-alt {
  background: var(--surface);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.section-eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary-light);
  margin-bottom: var(--space-2);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===================
   CARD GRIDS
   =================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

.card-grid--2col {
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
}

.card-grid--3col {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card-grid--4col {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

/* Stat grid — typically 3-4 cols */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
}

/* ===================
   FOOTER
   =================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-8) var(--space-5);
  text-align: center;
  background: var(--surface);
}

.footer-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
}

.footer-attribution {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.footer-line {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-line a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.footer-line a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-separator {
  width: 40px;
  height: 1px;
  background: var(--border);
}

.footer-copyright {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-4);
  opacity: 0.7;
}

/* ===================
   BACK TO TOP
   =================== */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--duration-base) var(--ease-out);
  z-index: var(--z-base);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-light);
}

/* ===================
   SCROLL REVEAL
   =================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.revealed > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.revealed > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-stagger.revealed > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-stagger.revealed > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-stagger.revealed > *:nth-child(6) { transition-delay: 0.3s; }
.reveal-stagger.revealed > *:nth-child(7) { transition-delay: 0.35s; }

.reveal-stagger.revealed > * {
  opacity: 1;
  transform: translateY(0);
}

/* ===================
   RESPONSIVE
   =================== */

/* Mobile ≤ 640px */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hamburger-btn { display: flex; }

  .hero-section {
    min-height: auto;
    padding: calc(var(--nav-height) + var(--space-8)) var(--space-4) var(--space-8);
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 2.75rem);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .card-grid,
  .card-grid--2col,
  .card-grid--3col,
  .card-grid--4col {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-header {
    margin-bottom: var(--space-6);
  }

  .section {
    padding: var(--space-8) 0;
  }

  .container, .container-wide, .container-narrow {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

/* Tablet 641-768px */
@media (min-width: 641px) and (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger-btn { display: flex; }

  .card-grid--4col {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Medium 769-1024px */
@media (min-width: 769px) and (max-width: 1024px) {
  .nav-link {
    font-size: var(--text-xs);
    padding: var(--space-2);
  }

  .card-grid--4col {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Large screens 1280px+ */
@media (min-width: 1280px) {
  .card-grid--4col {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===================
   PRINT
   =================== */
@media print {
  .site-nav,
  .back-to-top,
  .mobile-drawer,
  .hero-bg {
    display: none !important;
  }

  body {
    background: #fff !important;
    color: #000 !important;
  }

  .hero-section {
    min-height: auto !important;
    padding-top: 20px !important;
  }

  .card, .glass-card, .pillar-card {
    break-inside: avoid;
    border: 1px solid #ccc !important;
    box-shadow: none !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}