/* =============================================
   AI App Factory — Billing UI
   Design: Large fonts, easy for general users
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700;800&family=Inter:wght@400;600;700;900&display=swap');

:root {
  --primary:      #6366f1;
  --primary-dark: #4f46e5;
  --primary-light:#a5b4fc;
  --success:      #10b981;
  --danger:       #ef4444;
  --warning:      #f59e0b;
  --info:         #3b82f6;
  --dark:         #0f172a;
  --gray-900:     #111827;
  --gray-700:     #374151;
  --gray-500:     #6b7280;
  --gray-300:     #d1d5db;
  --gray-100:     #f3f4f6;
  --gray-50:      #f9fafb;
  --white:        #ffffff;
  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 4px 12px rgba(0,0,0,.08);
  --shadow-md:    0 8px 24px rgba(0,0,0,.12);
  --shadow-lg:    0 20px 40px rgba(0,0,0,.15);
  --transition:   all .2s ease;

  /* Large base font for readability */
  --font-base:   18px;
  --font-sm:     16px;
  --font-xs:     14px;
  --font-lg:     20px;
  --font-xl:     24px;
  --font-2xl:    30px;
  --font-3xl:    38px;
  --font-4xl:    48px;
}

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

body {
  font-family: 'Sarabun', 'Inter', sans-serif;
  font-size: var(--font-base);
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.65;
}

/* ── Layout ── */
.app-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 280px; min-height: 100vh; background: var(--dark);
  position: fixed; left: 0; top: 0; bottom: 0;
  display: flex; flex-direction: column; z-index: 50;
  transition: transform .3s;
}
.main-wrap { margin-left: 280px; flex: 1; }
.page-container { padding: 2rem 2.5rem; max-width: 1100px; }

/* ── Sidebar ── */
.sidebar-logo {
  padding: 1.75rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.sidebar-logo a {
  color: #fff; text-decoration: none;
  font-size: var(--font-xl); font-weight: 800;
  display: flex; align-items: center; gap: .5rem;
}
.sidebar-logo span { color: var(--primary-light); }
.sidebar-nav { flex: 1; padding: 1.25rem 0; overflow-y: auto; }
.nav-section {
  padding: .5rem 1.5rem .25rem;
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .12em;
  color: rgba(255,255,255,.3);
  margin-top: .75rem;
}
.nav-link {
  display: flex; align-items: center; gap: 1rem;
  padding: .9rem 1.5rem;
  color: rgba(255,255,255,.65);
  text-decoration: none;
  font-size: var(--font-sm); font-weight: 500;
  transition: var(--transition);
  border-right: 3px solid transparent;
}
.nav-link:hover, .nav-link.active {
  background: rgba(99,102,241,.2);
  color: #fff;
  border-right-color: var(--primary-light);
}
.nav-link .icon { font-size: 1.25rem; flex-shrink: 0; }
.sidebar-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,.1);
}
.user-chip {
  display: flex; align-items: center; gap: .875rem;
  padding: .75rem 1rem;
  background: rgba(255,255,255,.08);
  border-radius: var(--radius-sm);
  cursor: pointer; text-decoration: none;
}
.user-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--font-lg); font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.user-name { color: #fff; font-size: var(--font-sm); font-weight: 700; }
.user-plan { color: rgba(255,255,255,.5); font-size: var(--font-xs); margin-top: .1rem; }

/* ── Top bar ── */
.topbar {
  background: #fff; padding: 1.25rem 2.5rem;
  border-bottom: 1px solid var(--gray-300);
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 40;
  box-shadow: var(--shadow);
}
.topbar-title { font-size: var(--font-xl); font-weight: 800; color: var(--gray-900); }
.topbar-subtitle { font-size: var(--font-sm); color: var(--gray-500); margin-top: .2rem; }
.topbar-actions { display: flex; gap: .75rem; align-items: center; }

/* ── Balance Hero Card ── */
.balance-hero {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 60%, #2563eb 100%);
  color: #fff; border-radius: var(--radius);
  padding: 2.5rem; position: relative; overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.balance-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4z'/%3E%3C/g%3E%3C/svg%3E");
}
.balance-label { font-size: var(--font-lg); opacity: .8; margin-bottom: .5rem; }
.balance-amount {
  font-size: var(--font-4xl); font-weight: 900;
  line-height: 1; margin-bottom: 1.5rem;
}
.balance-amount sup { font-size: var(--font-2xl); vertical-align: super; font-weight: 700; }
.balance-stats { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.balance-stat-item .val { font-size: var(--font-xl); font-weight: 700; }
.balance-stat-item .lbl { font-size: var(--font-xs); opacity: .7; margin-top: .15rem; }
.balance-actions {
  display: flex; gap: 1rem; flex-wrap: wrap;
  margin-top: 2rem; position: relative; z-index: 1;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-sm); font-weight: 700;
  cursor: pointer; border: none;
  transition: var(--transition); text-decoration: none;
  white-space: nowrap; font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: #f5f3ff; transform: translateY(-2px); }
.btn-outline-white { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.5); }
.btn-outline-white:hover { background: rgba(255,255,255,.1); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-danger:hover  { background: #dc2626; }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-300); }
.btn-ghost { background: transparent; color: var(--gray-500); }
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-900); }
.btn-lg { padding: 1.1rem 2.25rem; font-size: var(--font-lg); border-radius: var(--radius); }
.btn-sm { padding: .5rem 1.1rem; font-size: var(--font-xs); }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ── Cards ── */
.card {
  background: #fff; border-radius: var(--radius);
  border: 1px solid var(--gray-300); box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--gray-100);
  display: flex; align-items: center; justify-content: space-between;
}
.card-title { font-size: var(--font-lg); font-weight: 800; }
.card-body { padding: 1.75rem; }
.card-footer { padding: 1.25rem 1.75rem; background: var(--gray-50); border-top: 1px solid var(--gray-100); }

/* ── Stat Cards ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 1.25rem; }
.stat-card {
  background: #fff; border-radius: var(--radius);
  border: 1px solid var(--gray-300); padding: 1.75rem;
  display: flex; align-items: center; gap: 1.25rem;
  box-shadow: var(--shadow);
}
.stat-icon {
  width: 60px; height: 60px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem; flex-shrink: 0;
}
.stat-value { font-size: var(--font-2xl); font-weight: 900; line-height: 1.1; }
.stat-label { font-size: var(--font-sm); color: var(--gray-500); margin-top: .25rem; }

/* ── Form ── */
.form-group { margin-bottom: 1.5rem; }
.form-label {
  display: block; font-size: var(--font-sm); font-weight: 700;
  color: var(--gray-700); margin-bottom: .6rem;
}
.form-control {
  width: 100%; padding: .9rem 1.1rem;
  border: 2px solid var(--gray-300); border-radius: var(--radius-sm);
  font-size: var(--font-base); color: var(--gray-900);
  background: #fff; transition: var(--transition); outline: none;
  font-family: inherit;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.form-control::placeholder { color: #aaa; }
.form-hint { font-size: var(--font-xs); color: var(--gray-500); margin-top: .4rem; }
.form-error { font-size: var(--font-xs); color: var(--danger); margin-top: .4rem; font-weight: 600; }

/* ── Amount selector ── */
.amount-pills { display: flex; gap: .75rem; flex-wrap: wrap; margin-bottom: 1rem; }
.amount-pill {
  padding: .7rem 1.4rem; border-radius: 999px;
  border: 2px solid var(--gray-300); background: #fff;
  font-size: var(--font-sm); font-weight: 700; cursor: pointer;
  transition: var(--transition); color: var(--gray-700);
}
.amount-pill:hover, .amount-pill.selected {
  border-color: var(--primary); background: var(--primary); color: #fff;
}

/* ── Table ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: var(--font-sm); }
thead tr { background: var(--gray-50); border-bottom: 2px solid var(--gray-300); }
th { padding: 1rem 1.25rem; text-align: left; font-weight: 700; color: var(--gray-500); font-size: var(--font-xs); text-transform: uppercase; letter-spacing: .05em; }
td { padding: 1rem 1.25rem; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); vertical-align: middle; font-size: var(--font-sm); }
tr:hover td { background: var(--gray-50); }
tr:last-child td { border-bottom: none; }

/* ── Badge ── */
.badge {
  display: inline-flex; align-items: center;
  padding: .35rem .875rem; border-radius: 999px;
  font-size: var(--font-xs); font-weight: 700;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger  { background: #fee2e2; color: #991b1b; }
.badge-primary { background: #ede9fe; color: #4f46e5; }
.badge-gray    { background: var(--gray-100); color: var(--gray-600); }
.badge-info    { background: #dbeafe; color: #1e40af; }

/* ── Transaction type colors ── */
.tx-TOP_UP         { color: var(--success); }
.tx-HOSTING_MONTHLY{ color: var(--primary); }
.tx-AI_USAGE       { color: #7c3aed; }
.tx-DEPLOYMENT_FEE { color: var(--info); }
.tx-ADJUSTMENT     { color: var(--warning); }
.tx-REFUND         { color: var(--success); }
.tx-BONUS          { color: var(--success); }
.tx-MEMBERSHIP_FEE { color: #0891b2; }
.tx-negative       { color: var(--danger); font-weight: 700; }
.tx-positive       { color: var(--success); font-weight: 700; }

/* ── Upload area ── */
.upload-area {
  border: 3px dashed var(--gray-300); border-radius: var(--radius);
  padding: 3rem 2rem; text-align: center; cursor: pointer;
  transition: var(--transition); background: var(--gray-50);
}
.upload-area:hover { border-color: var(--primary); background: #f5f3ff; }
.upload-area .upload-icon { font-size: 3.5rem; margin-bottom: 1rem; }
.upload-area .upload-title { font-size: var(--font-lg); font-weight: 700; margin-bottom: .5rem; }
.upload-area .upload-hint  { font-size: var(--font-sm); color: var(--gray-500); }

/* ── Status timeline ── */
.timeline { position: relative; }
.tl-item { display: flex; gap: 1rem; padding-bottom: 2rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; flex-shrink: 0; position: relative; z-index: 1;
  border: 3px solid var(--gray-300); background: #fff;
}
.tl-dot.done    { background: var(--success); border-color: var(--success); color: #fff; }
.tl-dot.active  { background: var(--primary); border-color: var(--primary); color: #fff; }
.tl-dot.pending { background: var(--gray-100); color: var(--gray-400); }
.tl-item:not(:last-child) .tl-dot::after {
  content: ''; position: absolute; left: 50%; top: 100%;
  width: 2px; height: calc(2rem - 4px);
  background: var(--gray-300); transform: translateX(-50%);
}
.tl-content { flex: 1; padding-top: .65rem; }
.tl-title { font-size: var(--font-base); font-weight: 700; }
.tl-desc  { font-size: var(--font-sm); color: var(--gray-500); margin-top: .2rem; }

/* ── Alert ── */
.alert {
  padding: 1.25rem 1.5rem; border-radius: var(--radius-sm);
  display: flex; align-items: flex-start; gap: 1rem;
  font-size: var(--font-sm); margin-bottom: 1.25rem;
}
.alert-icon { font-size: 1.5rem; flex-shrink: 0; }
.alert-info    { background: #eff6ff; border-left: 5px solid var(--info);    color: #1e40af; }
.alert-success { background: #f0fdf4; border-left: 5px solid var(--success); color: #166534; }
.alert-warning { background: #fffbeb; border-left: 5px solid var(--warning); color: #92400e; }
.alert-danger  { background: #fef2f2; border-left: 5px solid var(--danger);  color: #991b1b; }

/* ── Plan cards ── */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 1.5rem; }
.plan-card {
  background: #fff; border: 2px solid var(--gray-300);
  border-radius: var(--radius); padding: 2rem;
  text-align: center; transition: var(--transition); cursor: pointer;
}
.plan-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.plan-card.selected { border-color: var(--primary); background: #f5f3ff; box-shadow: 0 0 0 4px rgba(99,102,241,.1); }
.plan-card.popular { border-color: var(--primary); }
.plan-popular-badge {
  display: inline-block; background: var(--primary); color: #fff;
  font-size: var(--font-xs); font-weight: 700; padding: .3rem .875rem;
  border-radius: 999px; margin-bottom: 1rem;
}
.plan-name     { font-size: var(--font-xl); font-weight: 800; margin-bottom: .5rem; }
.plan-price    { font-size: var(--font-3xl); font-weight: 900; color: var(--primary); }
.plan-price sup{ font-size: var(--font-lg); vertical-align: super; }
.plan-period   { font-size: var(--font-sm); color: var(--gray-500); margin-bottom: 1.5rem; }
.plan-features { list-style: none; text-align: left; }
.plan-features li {
  display: flex; align-items: center; gap: .75rem;
  padding: .5rem 0; font-size: var(--font-sm);
  border-bottom: 1px solid var(--gray-100);
}
.plan-features li:last-child { border-bottom: none; }
.plan-features .check { color: var(--success); font-size: 1rem; }

/* ── API Key card ── */
.key-card {
  border: 2px solid var(--gray-300); border-radius: var(--radius);
  padding: 1.5rem; transition: var(--transition);
}
.key-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.key-prefix {
  font-family: 'Courier New', monospace; font-size: var(--font-xl);
  font-weight: 700; color: var(--primary); letter-spacing: .05em;
  background: #f5f3ff; padding: .5rem 1rem; border-radius: var(--radius-sm);
  display: inline-block; margin-bottom: .75rem;
}
.key-stats { display: flex; gap: 2rem; flex-wrap: wrap; margin-top: 1rem; }
.key-stat .val { font-size: var(--font-lg); font-weight: 800; }
.key-stat .lbl { font-size: var(--font-xs); color: var(--gray-500); }

/* ── Modal ── */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,.5);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; padding: 1rem;
}
.modal {
  background: #fff; border-radius: var(--radius);
  width: 100%; max-width: 520px;
  box-shadow: var(--shadow-lg); animation: modalIn .25s ease;
}
@keyframes modalIn { from { transform: scale(.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-header { padding: 1.5rem 1.75rem; border-bottom: 1px solid var(--gray-100); display: flex; align-items: center; justify-content: space-between; }
.modal-title  { font-size: var(--font-xl); font-weight: 800; }
.modal-body   { padding: 1.75rem; }
.modal-footer { padding: 1.25rem 1.75rem; border-top: 1px solid var(--gray-100); display: flex; gap: .75rem; justify-content: flex-end; }
.modal-close  { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--gray-500); line-height: 1; }

/* ── Progress bar ── */
.progress { height: 10px; background: var(--gray-200); border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--primary-light)); transition: width .5s ease; }

/* ── Toast ── */
.toast-container { position: fixed; bottom: 2rem; right: 2rem; z-index: 9999; display: flex; flex-direction: column; gap: .75rem; }
.toast {
  padding: 1.1rem 1.5rem; border-radius: var(--radius-sm);
  color: #fff; font-size: var(--font-sm); font-weight: 600;
  display: flex; align-items: center; gap: .875rem;
  box-shadow: var(--shadow-lg); animation: toastIn .3s ease;
  min-width: 300px; max-width: 420px;
}
@keyframes toastIn { from { transform: translateX(120%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.toast-success { background: var(--success); }
.toast-danger  { background: var(--danger); }
.toast-warning { background: var(--warning); }
.toast-info    { background: var(--info); }
.toast-close   { background: none; border: none; color: rgba(255,255,255,.8); font-size: 1.1rem; cursor: pointer; margin-left: auto; }

/* ── Grid helpers ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }
.flex    { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: .5rem; }
.gap-3 { gap: .75rem; }
.gap-4 { gap: 1rem; }
.mt-2  { margin-top: .5rem; }
.mt-4  { margin-top: 1rem; }
.mt-6  { margin-top: 1.5rem; }
.mt-8  { margin-top: 2rem; }
.mb-4  { margin-bottom: 1rem; }
.mb-6  { margin-bottom: 1.5rem; }
.text-muted  { color: var(--gray-500); }
.text-sm     { font-size: var(--font-sm); }
.text-xs     { font-size: var(--font-xs); }
.fw-bold     { font-weight: 700; }
.fw-black    { font-weight: 900; }
.divider     { height: 1px; background: var(--gray-100); margin: 1.5rem 0; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-wrap { margin-left: 0; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .page-container { padding: 1.25rem; }
  .balance-amount { font-size: var(--font-3xl); }
  .plan-grid { grid-template-columns: 1fr; }
}