*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --font: 'Inter', 'Noto Sans JP', ui-sans-serif, system-ui, sans-serif; --accent: #2563eb; --accent-hover: #1d4ed8; --success: #16a34a; --danger: #dc2626; --warning: #d97706; }
.dark { --bg: #030712; --bg-card: #11182780; --bg-elevated: #1f2937; --text: #f3f4f6; --text-secondary: #9ca3af; --text-muted: #9ca3af; --text-dim: #6b7280; --border: #374151; --border-subtle: #1f2937; --accent-soft: #3b82f640; --overlay: rgba(0,0,0,0.7); --badge-bg: #1e293b; }
:root { --bg: #ffffff; --bg-card: #ffffff; --bg-elevated: #f9fafb; --text: #111827; --text-secondary: #4b5563; --text-muted: #6b7280; --text-dim: #9ca3af; --border: #e5e7eb; --border-subtle: #f3f4f6; --accent-soft: #2563eb20; --overlay: rgba(0,0,0,0.4); --badge-bg: #f0f9ff; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; transition: background 0.3s, color 0.3s; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1024px; margin: 0 auto; padding: 32px 16px; }

.header { position: sticky; top: 0; z-index: 50; background: var(--bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-subtle); padding: 0 16px; }
.header-inner { max-width: 1024px; margin: 0 auto; height: 56px; display: flex; align-items: center; justify-content: space-between; }
.header-title { font-size: 16px; font-weight: 700; letter-spacing: -0.025em; }

.card { background: var(--bg-card); border-radius: 16px; padding: 24px; margin-bottom: 16px; border: 1px solid var(--border); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }

h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.025em; }
h2 { font-size: 17px; font-weight: 600; }
h3 { font-size: 15px; font-weight: 600; }

.form-group { margin-bottom: 16px; }
label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--text-secondary); }
input, select { width: 100%; padding: 9px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; font-family: var(--font); transition: border-color 0.15s; }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: 8px; font-size: 13px; font-weight: 500; cursor: pointer; border: none; font-family: var(--font); transition: all 0.15s; }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #15803d; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-outline:hover { background: var(--bg-elevated); color: var(--text); }
.btn-sm { padding: 5px 14px; font-size: 12px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.theme-btn { background: transparent; border: 1px solid var(--border); cursor: pointer; color: var(--text-muted); padding: 6px 8px; border-radius: 6px; font-size: 15px; line-height: 1; transition: all 0.15s; }
.theme-btn:hover { background: var(--bg-elevated); }

.tabs { display: flex; gap: 2px; margin-bottom: 24px; background: var(--bg-elevated); border-radius: 10px; padding: 3px; }
.tab { flex: 1; padding: 8px 12px; text-align: center; border-radius: 8px; cursor: pointer; font-size: 13px; font-weight: 500; color: var(--text-muted); border: none; background: transparent; font-family: var(--font); transition: all 0.15s; }
.tab:hover { color: var(--text); }
.tab.active { background: var(--accent); color: white; }

.badge { display: inline-flex; align-items: center; padding: 2px 10px; border-radius: 9999px; font-size: 11px; font-weight: 600; }
.badge-pending { background: #f59e0b18; color: var(--warning); }
.badge-approved { background: #22c55e18; color: var(--success); }
.badge-rejected { background: #ef444418; color: var(--danger); }
.badge-completed { background: #3b82f618; color: var(--accent); }

.payment-card { padding: 20px; border: 1px solid var(--border); border-radius: 14px; margin-bottom: 12px; transition: all 0.2s; }
.payment-card:hover { border-color: var(--border); box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
.payment-card:last-child { margin-bottom: 0; }
.payment-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.payment-info { flex: 1; min-width: 0; }
.payment-amount { font-size: 22px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 4px; }
.payment-merchant { color: var(--text-secondary); font-size: 14px; font-weight: 500; }
.payment-desc { color: var(--text-muted); font-size: 13px; margin-top: 6px; line-height: 1.5; }
.payment-meta { color: var(--text-dim); font-size: 12px; margin-top: 10px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.payment-actions { display: flex; gap: 8px; flex-shrink: 0; padding-top: 2px; }

.empty-state { text-align: center; padding: 56px 24px; color: var(--text-dim); }
.empty-state svg { width: 40px; height: 40px; margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 14px; margin-top: 8px; }

.card-item { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 8px; transition: background 0.15s; }
.card-item:hover { background: var(--bg-elevated); }
.card-label { font-weight: 600; font-size: 14px; }
.card-meta { color: var(--text-dim); font-size: 12px; margin-top: 2px; }
.card-actions { display: flex; gap: 8px; }

.key-display { background: var(--bg); padding: 14px; border-radius: 8px; font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace; font-size: 12px; word-break: break-all; margin: 8px 0; color: var(--success); border: 1px solid var(--border); }
.copy-btn { margin-left: 8px; }

.notification { position: fixed; top: 20px; right: 20px; padding: 12px 22px; border-radius: 10px; font-size: 13px; font-weight: 500; z-index: 1000; animation: slideIn 0.3s; box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.notification-success { background: var(--success); color: white; }
.notification-error { background: var(--danger); color: white; }

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.loading { text-align: center; padding: 48px; color: var(--text-dim); }

.modal-overlay { position: fixed; inset: 0; background: var(--overlay); display: flex; align-items: center; justify-content: center; z-index: 100; animation: fadeIn 0.15s; }
.modal { background: var(--bg-card); border-radius: 16px; padding: 28px; width: 90%; max-width: 460px; border: 1px solid var(--border); box-shadow: 0 20px 60px rgba(0,0,0,0.2); }
.modal h3 { font-size: 17px; font-weight: 600; margin-bottom: 20px; letter-spacing: -0.01em; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 24px; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.setup-banner { border: 1px solid #f59e0b40; background: #f59e0b08; border-radius: 12px; padding: 14px 18px; margin-bottom: 24px; font-size: 13px; color: var(--warning); line-height: 1.6; }
.setup-banner strong { color: var(--warning); font-weight: 600; }

@media (max-width: 640px) {
  .container { padding: 20px 12px; }
  .payment-row { flex-direction: column; }
  .payment-actions { padding-top: 8px; align-self: flex-end; }
  .tabs { overflow-x: auto; }
  .tab { flex: none; white-space: nowrap; font-size: 12px; padding: 7px 10px; }
}