/* ============================================================
   Titan Arc Link Co., Ltd. — Common CSS
   © 2026 Titan Arc Link Co., Ltd.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* ── CSS Variables ── */
:root {
  --bg-primary:    #060810;
  --bg-secondary:  #0b0f1a;
  --bg-card:       #0f1525;
  --bg-card2:      #131b2e;
  --accent-cyan:   #00d4ff;
  --accent-blue:   #0055ff;
  --accent-glow:   rgba(0, 212, 255, 0.12);
  --text-primary:  #e8eaf2;
  --text-secondary:#8892a8;
  --text-muted:    #4a5568;
  --border:        rgba(0, 212, 255, 0.18);
  --metallic:      #c8d0e0;
  --font-heading:  'Orbitron', sans-serif;
  --font-body:     'Noto Sans JP', sans-serif;
  --nav-height:    72px;
  --radius-sm:     6px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --transition:    0.3s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: var(--accent-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: #fff; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--accent-cyan); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #00b8e0; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  background: rgba(6, 8, 16, 0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition), background var(--transition);
}
.nav.scrolled {
  box-shadow: 0 4px 40px rgba(0, 212, 255, 0.10);
  background: rgba(6, 8, 16, 0.92);
}
.nav-inner {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  gap: 0;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-text {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--metallic);
  letter-spacing: 0.04em;
  line-height: 1.2;
}
.nav-logo-text span { display: block; font-size: 0.62rem; font-weight: 400; color: var(--text-secondary); letter-spacing: 0.08em; }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: auto;
}
.nav-item {
  position: relative;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--accent-cyan); background: var(--accent-glow); }
.nav-link .arrow {
  width: 10px; height: 10px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--transition);
  flex-shrink: 0;
  opacity: 0.6;
}
.nav-item:hover > .nav-link .arrow { transform: rotate(225deg) translateY(-2px); }

/* Dropdowns */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 200px;
  background: rgba(11, 15, 26, 0.97);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: 0 16px 40px rgba(0,0,0,0.6), 0 0 0 1px var(--border);
}
.nav-item:hover > .nav-dropdown {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.81rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-dropdown a:hover { color: var(--accent-cyan); background: var(--accent-glow); }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  margin-left: auto;
  cursor: pointer;
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--metallic);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  background: rgba(6, 8, 16, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  z-index: 999;
  max-height: calc(100vh - var(--nav-height));
  overflow-y: auto;
}
.nav-mobile.open { display: block; }
.nav-mobile-link {
  display: block;
  padding: 0.6rem 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-mobile-link:hover { color: var(--accent-cyan); background: var(--accent-glow); }
.nav-mobile-group { margin-bottom: 0.5rem; }
.nav-mobile-group-label {
  padding: 0.5rem 1rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-heading);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem 2rem;
}
.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.footer-brand { }
.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}
.footer-logo-text {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--metallic);
}
.footer-logo-text span { display: block; font-size: 0.6rem; font-weight: 400; color: var(--text-secondary); }
.footer-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.footer-contact { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.9; }
.footer-contact a { color: var(--accent-cyan); }
.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.footer-col a {
  display: block;
  font-size: 0.81rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent-cyan); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-copy a { color: var(--text-muted); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.40);
  color: #fff;
  opacity: 0.92;
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--accent-glow);
  color: var(--accent-cyan);
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
}
.btn-secondary:hover {
  transform: translateY(-2px);
  background: rgba(0, 212, 255, 0.18);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.2);
  color: var(--accent-cyan);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  text-decoration: none;
}
.btn-outline:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 212, 255, 0.10);
}
.card-glow {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card-glow::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
}
.card-glow:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 48px rgba(0, 212, 255, 0.14), 0 0 0 1px rgba(0, 212, 255, 0.2);
}
.card-dark {
  background: var(--bg-card2);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition), border-color var(--transition);
}
.card-dark:hover { transform: translateY(-3px); border-color: var(--border); }

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: 6rem 2rem;
}
.section-dark {
  padding: 6rem 2rem;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}
.section-alt {
  padding: 6rem 2rem;
  background: var(--bg-card);
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-inner-wide {
  max-width: 1400px;
  margin: 0 auto;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
.title-xl {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.title-lg {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.title-md {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}
.subtitle {
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.85;
  max-width: 640px;
}
.body-text {
  font-size: 0.92rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.9;
}
.label-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: var(--accent-glow);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 0.7rem;
  margin-bottom: 1rem;
}
.section-header { margin-bottom: 3.5rem; }
.section-header .subtitle { margin-top: 0.75rem; }

/* ============================================================
   ARC DECORATIVE ELEMENTS
   ============================================================ */
.arc-deco {
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
}
.arc-deco-1 {
  width: 500px; height: 500px;
  top: -200px; right: -150px;
  border: 1px solid rgba(0, 212, 255, 0.08);
  box-shadow: inset 0 0 80px rgba(0, 212, 255, 0.04);
}
.arc-deco-2 {
  width: 300px; height: 300px;
  bottom: -100px; left: -100px;
  border: 1px solid rgba(0, 85, 255, 0.10);
}
.arc-line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.2;
  pointer-events: none;
}

/* ============================================================
   GRID LAYOUTS
   ============================================================ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.breadcrumb a { color: var(--text-secondary); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--accent-cyan); }
.breadcrumb-sep { opacity: 0.4; }

/* ============================================================
   PAGE HERO (inner pages)
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-height) + 4rem) 2rem 4rem;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.page-hero::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 700px; height: 700px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible {
  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; }

/* ============================================================
   NOTIFICATION SYSTEM
   ============================================================ */
.notif {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  padding: 0.9rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-family: var(--font-body);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  background: rgba(15, 21, 37, 0.92);
  color: var(--text-primary);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s ease, transform 0.35s ease;
  max-width: 340px;
}
.notif.show { opacity: 1; transform: translateY(0); }
.notif-success { border-color: rgba(0, 212, 255, 0.4); }
.notif-success::before { content: '✓ '; color: var(--accent-cyan); font-weight: 700; }
.notif-error { border-color: rgba(255, 60, 80, 0.4); }
.notif-error::before { content: '✗ '; color: #ff3c50; font-weight: 700; }
.notif-info { border-color: rgba(0, 85, 255, 0.4); }
.notif-info::before { content: 'i '; color: var(--accent-blue); font-weight: 700; }

/* ============================================================
   KEYFRAME ANIMATIONS
   ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.15); }
  50%       { box-shadow: 0 0 40px rgba(0, 212, 255, 0.35); }
}
@keyframes arcRotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
@keyframes borderGlow {
  0%, 100% { border-color: rgba(0, 212, 255, 0.18); }
  50%       { border-color: rgba(0, 212, 255, 0.45); }
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

/* ============================================================
   UTILITY
   ============================================================ */
.text-center { text-align: center; }
.text-cyan { color: var(--accent-cyan); }
.text-muted { color: var(--text-muted); }
.text-secondary-color { color: var(--text-secondary); }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-6 { margin-bottom: 3rem; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.w-full { width: 100%; }

/* Divider */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 3rem 0;
}

/* Icon box */
.icon-box {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: var(--accent-glow);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-bottom: 1rem;
}
.icon-box svg { width: 26px; height: 26px; }

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table th, .data-table td {
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.data-table th {
  color: var(--text-secondary);
  font-weight: 500;
  width: 200px;
  background: var(--bg-card2);
}
.data-table td { color: var(--text-primary); }
.data-table tr:last-child th,
.data-table tr:last-child td { border-bottom: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .footer-brand { grid-column: 1 / -1; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; text-align: center; }

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

  .section { padding: 4rem 1.25rem; }
  .section-dark { padding: 4rem 1.25rem; }
  .section-alt { padding: 4rem 1.25rem; }
  .page-hero { padding: calc(var(--nav-height) + 2.5rem) 1.25rem 2.5rem; }
  .data-table th { width: 120px; }

  .notif { right: 1rem; bottom: 1rem; left: 1rem; max-width: none; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .btn-primary, .btn-secondary { font-size: 0.72rem; padding: 0.65rem 1.25rem; }
}