@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-base:     #f8fafc;
  --bg-surface:  #f1f5f9;
  --bg-card:     #ffffff;
  --bg-elevated: #f8fafc;
  --border:      #e2e8f0;
  --border-light:#cbd5e1;
  --accent:      #0ea5e9;
  --accent-hover:#0284c7;
  --accent-dim:  rgba(14,165,233,0.10);
  --accent-glow: rgba(14,165,233,0.20);
  --success:     #10b981;
  --warning:     #f59e0b;
  --danger:      #ef4444;
  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg:  0 8px 30px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-glow:0 0 24px rgba(14,165,233,0.18);
  --font: 'Inter', -apple-system, sans-serif;
  --transition: 0.18s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-dim);
  font-weight: 600;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-surface);
  border-color: var(--border-light);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
  background: var(--bg-surface);
}

.btn-danger {
  background: rgba(239,68,68,0.08);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}
.btn-danger:hover { background: rgba(239,68,68,0.14); }

.btn-sm  { padding: 5px 11px; font-size: 0.8rem; }
.btn-lg  { padding: 13px 26px; font-size: 0.95rem; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ── FORM ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.form-label .optional {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
  margin-left: 6px;
  font-size: 0.76rem;
}

.form-input,
.form-textarea,
.form-select {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 10px 13px;
  transition: all var(--transition);
  width: 100%;
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-input::placeholder,
.form-textarea::placeholder { color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 80px; }

/* ── CARD COMPONENT ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── BADGE ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
}
.badge-accent { background: var(--accent-dim); color: var(--accent); }
.badge-gray {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ── TOAST ── */
#toast-container {
  position: fixed;
  bottom: 20px;
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 11px 16px;
  font-size: 0.86rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  animation: slideIn 0.25s ease;
  min-width: 220px;
  max-width: 320px;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.info    { border-left: 3px solid var(--accent); }

@keyframes slideIn {
  from { transform: translateX(110%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
@keyframes fadeOut {
  from { opacity: 1; }
  to   { opacity: 0; transform: translateY(6px); }
}

/* ── MODAL ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.45);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  transform: translateY(12px);
  transition: transform var(--transition);
}
.modal-overlay.open .modal { transform: translateY(0); }

/* ── DIVIDER ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

/* ── EMPTY STATE ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 64px 24px;
  text-align: center;
}
.empty-state-icon { font-size: 2.5rem; opacity: 0.25; }
.empty-state h3   { color: var(--text-secondary); font-weight: 600; }
.empty-state p    { color: var(--text-muted); font-size: 0.88rem; }

/* ── UTILS ── */
.page-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px;
}
.flex           { display: flex; }
.flex-col       { display: flex; flex-direction: column; }
.items-center   { align-items: center; }
.justify-between{ justify-content: space-between; }
.gap-2 { gap: 8px; }  .gap-3 { gap: 12px; }
.gap-4 { gap: 16px; } .gap-6 { gap: 24px; }
.mt-2 { margin-top: 8px; }  .mt-4 { margin-top: 16px; }
.text-muted   { color: var(--text-secondary); font-size: 0.88rem; }
.text-accent  { color: var(--accent); }
.font-bold    { font-weight: 700; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar       { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ── HAMBURGER ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: background var(--transition);
}
.nav-hamburger:hover { background: var(--bg-surface); }
.ham-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all .22s ease;
  transform-origin: center;
}
/* × アニメーション */
.nav-hamburger.open .ham-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open .ham-line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open .ham-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MOBILE ── */
@media (max-width: 768px) {
  .nav-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 10px 16px 16px;
    gap: 2px;
    z-index: 99;
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
  }
  .nav-links.open { display: flex; }

  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: 11px 14px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }
}

@media (max-width: 600px) {
  .nav { padding: 0 14px; height: 52px; }
  .nav-links { top: 52px; }
  .page-wrapper { padding: 20px 14px; }
  .modal { padding: 22px 18px; }
  .grid-2 { grid-template-columns: 1fr; }
}