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

:root {
  --primary: #10B981;
  --primary-dark: #059669;
  --primary-light: #D1FAE5;
  --primary-50: #ECFDF5;
  --dark-50: #F8FAFC;
  --dark-100: #F1F5F9;
  --dark-200: #E2E8F0;
  --dark-300: #CBD5E1;
  --dark-400: #94A3B8;
  --dark-500: #64748B;
  --dark-700: #334155;
  --dark-800: #1E293B;
  --dark-900: #0F172A;
  --success: #22C55E;
  --success-light: #DCFCE7;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --error: #EF4444;
  --error-light: #FEE2E2;
  --info: #3B82F6;
  --info-light: #DBEAFE;
  --white: #FFFFFF;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; background: var(--dark-50); color: var(--dark-800); line-height: 1.5; }
a { text-decoration: none; color: var(--primary); }

/* ─── LAYOUT ─────────────────────────────────────────────────────────── */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.mt-1 { margin-top: 4px; } .mt-2 { margin-top: 8px; } .mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; } .mt-6 { margin-top: 24px; } .mt-8 { margin-top: 32px; }
.mb-2 { margin-bottom: 8px; } .mb-4 { margin-bottom: 16px; }
.ml-2 { margin-left: 8px; }
.text-center { text-align: center; } .text-right { text-align: right; }
.text-sm { font-size: 0.875rem; } .text-xs { font-size: 0.75rem; }
.text-muted { color: var(--dark-500); }
.text-success { color: var(--primary); }
.text-error { color: var(--error); }
.font-mono { font-family: 'JetBrains Mono', monospace; }
.flex { display: flex; } .items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; } .gap-3 { gap: 12px; }
.w-full { width: 100%; }

/* ─── NAVBAR ─────────────────────────────────────────────────────────── */
.navbar { background: var(--white); border-bottom: 1px solid var(--dark-200); padding: 14px 0; position: sticky; top: 0; z-index: 100; }
.nav-content { display: flex; justify-content: space-between; align-items: center; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a { padding: 6px 12px; font-weight: 500; color: var(--dark-700); font-size: 0.9rem; border-radius: var(--radius-md); transition: background 0.15s; }
.nav-links a:hover { background: var(--dark-100); }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.2rem; color: var(--dark-900); }
.logo-icon { width: 32px; height: 32px; background: var(--primary); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; }

/* ─── BUTTONS ────────────────────────────────────────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 18px; border-radius: var(--radius-md); font-weight: 600; cursor: pointer; border: none; text-align: center; transition: all 0.18s; font-family: inherit; font-size: 0.9rem; white-space: nowrap; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(16,185,129,0.35); }
.btn-secondary { background: var(--dark-100); color: var(--dark-800); border: 1px solid var(--dark-200); }
.btn-secondary:hover:not(:disabled) { background: var(--dark-200); }
.btn-danger { background: var(--error); color: white; }
.btn-danger:hover:not(:disabled) { background: #DC2626; transform: translateY(-1px); }
.btn-outline { border: 1.5px solid var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover:not(:disabled) { background: var(--primary-50); }
.btn-ghost { background: transparent; color: var(--dark-500); }
.btn-ghost:hover:not(:disabled) { background: var(--dark-100); color: var(--dark-800); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-lg { padding: 12px 24px; font-size: 1rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; }

/* ─── CARDS ──────────────────────────────────────────────────────────── */
.card { background: var(--white); border-radius: var(--radius-lg); border: 1px solid var(--dark-200); padding: 24px; box-shadow: var(--shadow-sm); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card-title { font-size: 1rem; font-weight: 700; color: var(--dark-900); }

/* ─── FORMS ──────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; text-align: left; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.8rem; color: var(--dark-700); text-transform: uppercase; letter-spacing: 0.04em; }
input, select, textarea {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--dark-200); border-radius: var(--radius-md);
  font-family: inherit; font-size: 0.95rem; transition: all 0.18s; background: var(--white); color: var(--dark-800);
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(16,185,129,0.12);
}
input::placeholder, textarea::placeholder { color: var(--dark-400); }

/* ─── BADGES ─────────────────────────────────────────────────────────── */
.badge { display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 20px; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; gap: 4px; }
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-success { background: var(--success-light); color: #15803D; }
.badge-error { background: var(--error-light); color: #B91C1C; }
.badge-warning { background: var(--warning-light); color: #B45309; }
.badge-info { background: var(--info-light); color: #1D4ED8; }
.badge-neutral { background: var(--dark-100); color: var(--dark-600); }
.badge-connected { background: var(--success-light); color: #15803D; }
.badge-disconnected { background: var(--error-light); color: #B91C1C; }
.badge-qr_ready { background: var(--warning-light); color: #B45309; }
.badge-starting { background: var(--info-light); color: #1D4ED8; }

/* ─── STATS GRID ─────────────────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.stat-card { background: var(--white); padding: 20px; border-radius: var(--radius-lg); border: 1px solid var(--dark-200); box-shadow: var(--shadow-sm); }
.stat-label { color: var(--dark-500); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.stat-value { font-size: 1.8rem; font-weight: 800; margin-top: 6px; color: var(--dark-900); }
.stat-sub { font-size: 0.75rem; color: var(--dark-400); margin-top: 2px; }

/* ─── MODAL ──────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(15,23,42,0.6); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 20px; animation: fadeIn 0.18s ease;
}
.modal-box {
  background: var(--white); border-radius: var(--radius-xl);
  width: 100%; max-width: 520px; max-height: 90vh;
  overflow-y: auto; box-shadow: var(--shadow-xl);
  animation: slideUp 0.22s ease;
}
.modal-box.modal-sm { max-width: 400px; }
.modal-box.modal-lg { max-width: 680px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 20px 24px; border-bottom: 1px solid var(--dark-100); }
.modal-header h3 { font-size: 1.1rem; font-weight: 700; }
.modal-close { background: none; border: none; cursor: pointer; color: var(--dark-400); font-size: 1.2rem; width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
.modal-close:hover { background: var(--dark-100); color: var(--dark-800); }
.modal-body { padding: 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--dark-100); display: flex; justify-content: flex-end; gap: 10px; }

/* ─── TOAST ──────────────────────────────────────────────────────────── */
#toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; pointer-events: none; }
.toast {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px; border-radius: var(--radius-lg);
  background: var(--dark-900); color: white;
  font-size: 0.9rem; font-weight: 500;
  box-shadow: var(--shadow-xl); min-width: 280px; max-width: 380px;
  pointer-events: all; animation: slideInRight 0.28s ease;
  border-left: 4px solid transparent;
}
.toast.toast-success { border-color: var(--primary); }
.toast.toast-error { border-color: var(--error); }
.toast.toast-warning { border-color: var(--warning); }
.toast.toast-info { border-color: var(--info); }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }
.toast-msg { flex: 1; }
.toast-close { background: none; border: none; color: #94A3B8; cursor: pointer; font-size: 1rem; padding: 2px; margin-left: 4px; }
.toast-close:hover { color: white; }

/* ─── PAYMENT ALERT ──────────────────────────────────────────────────── */
.payment-alert {
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  border: 1px solid var(--warning); border-radius: var(--radius-lg);
  padding: 16px 20px; margin-bottom: 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.payment-alert.payment-critical {
  background: linear-gradient(135deg, #FEE2E2, #FECACA);
  border-color: var(--error);
}
.payment-alert-text strong { display: block; font-weight: 700; margin-bottom: 2px; }
.payment-alert-text span { font-size: 0.85rem; color: var(--dark-700); }

/* ─── INSTANCE CARD ──────────────────────────────────────────────────── */
.instance-card { background: var(--white); border: 1px solid var(--dark-200); border-radius: var(--radius-lg); overflow: hidden; transition: box-shadow 0.18s; }
.instance-card:hover { box-shadow: var(--shadow-md); }
.instance-card-header { padding: 16px 18px; display: flex; justify-content: space-between; align-items: flex-start; }
.instance-name { font-weight: 700; font-size: 0.95rem; color: var(--dark-900); }
.instance-number { font-size: 0.8rem; color: var(--dark-500); margin-top: 2px; font-family: 'JetBrains Mono', monospace; }
.instance-card-api { background: var(--dark-900); padding: 12px 14px; }
.api-label { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #475569; margin-bottom: 6px; }
.api-row { display: flex; justify-content: space-between; align-items: center; background: #1E293B; border-radius: 6px; padding: 6px 10px; margin-bottom: 4px; gap: 8px; }
.api-row:last-child { margin-bottom: 0; }
.api-row code { font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; color: #38BDF8; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.api-copy { background: transparent; border: 1px solid #334155; color: #94A3B8; cursor: pointer; border-radius: 4px; padding: 2px 8px; font-size: 0.7rem; font-weight: 600; transition: all 0.15s; flex-shrink: 0; }
.api-copy:hover { border-color: var(--primary); color: var(--primary); }
.instance-card-actions { padding: 10px 14px; display: flex; gap: 8px; border-top: 1px solid var(--dark-100); flex-wrap: wrap; }

/* ─── TABS ───────────────────────────────────────────────────────────── */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--dark-200); margin-bottom: 24px; }
.tab-btn { padding: 10px 16px; font-weight: 600; font-size: 0.875rem; cursor: pointer; background: none; border: none; color: var(--dark-500); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all 0.15s; border-radius: var(--radius-md) var(--radius-md) 0 0; }
.tab-btn:hover { color: var(--dark-800); background: var(--dark-50); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); background: var(--primary-50); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.18s ease; }

/* ─── CODE BOX ───────────────────────────────────────────────────────── */
.code-box { background: var(--dark-900); color: #E2E8F0; padding: 14px 16px; border-radius: var(--radius-md); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; line-height: 1.7; white-space: pre; overflow-x: auto; }
.code-keyword { color: #38BDF8; }
.code-string { color: #86EFAC; }
.code-key { color: #F9A8D4; }

/* ─── PLAN CARDS ─────────────────────────────────────────────────────── */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.plan-card { border: 2px solid var(--dark-200); border-radius: var(--radius-lg); padding: 24px; transition: all 0.2s; cursor: pointer; position: relative; background: var(--white); }
.plan-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.plan-card.current { border-color: var(--primary); background: var(--primary-50); }
.plan-card .plan-badge { position: absolute; top: -10px; left: 50%; transform: translateX(-50%); background: var(--primary); color: white; font-size: 0.65rem; font-weight: 800; padding: 3px 10px; border-radius: 20px; white-space: nowrap; }
.plan-name { font-size: 1rem; font-weight: 800; color: var(--dark-900); }
.plan-price { font-size: 1.8rem; font-weight: 800; color: var(--primary); margin: 8px 0; }
.plan-price span { font-size: 0.85rem; font-weight: 500; color: var(--dark-500); }
.plan-features { list-style: none; margin-top: 12px; }
.plan-features li { font-size: 0.82rem; color: var(--dark-600); padding: 4px 0; display: flex; align-items: center; gap: 6px; }
.plan-features li::before { content: '✓'; color: var(--primary); font-weight: 800; }

/* ─── HISTORY TABLE ──────────────────────────────────────────────────── */
.history-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.history-table th { padding: 10px 14px; text-align: left; font-weight: 700; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--dark-500); border-bottom: 2px solid var(--dark-200); }
.history-table td { padding: 10px 14px; border-bottom: 1px solid var(--dark-100); vertical-align: top; }
.history-table tr:hover td { background: var(--dark-50); }
.dir-sent { color: var(--primary); font-weight: 700; font-size: 0.72rem; }
.dir-received { color: var(--info); font-weight: 700; font-size: 0.72rem; }
.msg-text { max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ─── EMPTY STATE ────────────────────────────────────────────────────── */
.empty-state { text-align: center; padding: 60px 20px; }
.empty-state-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { font-size: 1.1rem; font-weight: 700; color: var(--dark-700); margin-bottom: 6px; }
.empty-state p { font-size: 0.875rem; color: var(--dark-500); }

/* ─── SEARCH ─────────────────────────────────────────────────────────── */
.search-bar { position: relative; }
.search-bar input { padding-left: 38px; }
.search-bar::before { content: '🔍'; position: absolute; left: 12px; top: 50%; transform: translateY(-50%); font-size: 0.85rem; pointer-events: none; }

/* ─── ANIMATIONS ─────────────────────────────────────────────────────── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideOutRight { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(100%); } }

/* ─── LOADING SPINNER ────────────────────────────────────────────────── */
.spinner { width: 20px; height: 20px; border: 2px solid rgba(255,255,255,0.3); border-top-color: white; border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── RESPONSIVE ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .grid-dashboard { grid-template-columns: 1fr !important; }
  .nav-links .hide-mobile { display: none; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}