/* ===== DANCE TEM SYSTEM — MAIN STYLES ===== */
:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -1px rgba(0,0,0,.04);
}

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

body {
  font-family: 'Sarabun', sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  /* ป้องกัน zoom เมื่อ tap input บน iOS */
  -webkit-text-size-adjust: 100%;
}

/* ===== LAYOUT ===== */
.app-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  background: var(--primary);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.logo-icon {
  width: 38px; height: 38px;
  background: var(--accent);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px;
  flex-shrink: 0;
}
.logo-name { color: #fff; font-weight: 600; font-size: 15px; }
.logo-sub { color: rgba(255,255,255,.45); font-size: 11px; }

.sidebar-nav {
  flex: 1;
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  color: rgba(255,255,255,.65);
  text-decoration: none;
  border-radius: 8px;
  font-size: 14px;
  transition: all .15s;
  /* touch target */
  min-height: 44px;
}
.nav-link i { width: 18px; text-align: center; flex-shrink: 0; }
.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; }
.nav-link.active { background: var(--accent); color: #fff; font-weight: 500; }

.sidebar-footer {
  padding: 1rem 0.75rem;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.admin-info { display: flex; align-items: center; gap: 8px; }
.admin-avatar {
  width: 32px; height: 32px;
  background: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 13px; font-weight: 600;
  flex-shrink: 0;
}
.admin-name { color: rgba(255,255,255,.8); font-size: 13px; }
.logout-btn {
  color: rgba(255,255,255,.45);
  text-decoration: none;
  padding: 8px;
  border-radius: 6px;
  transition: all .15s;
  min-width: 36px; min-height: 36px;
  display: flex; align-items: center; justify-content: center;
}
.logout-btn:hover { color: var(--danger); background: rgba(239,68,68,.15); }

.main-content {
  margin-left: 240px;
  flex: 1;
  min-height: 100vh;
  /* ป้องกัน overflow แนวนอนบนมือถือ */
  min-width: 0;
  overflow-x: hidden;
}

.page-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
  flex-wrap: wrap;
  gap: 8px;
}
.page-title { font-size: 18px; font-weight: 600; }
.page-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.page-body { padding: 2rem; }

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  flex-wrap: wrap;
}
.card-title i { color: var(--accent); flex-shrink: 0; }

/* ===== STATS ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 1.75rem; }
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}
.stat-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; font-weight: 500; text-transform: uppercase; letter-spacing: .5px; }
.stat-value { font-size: 26px; font-weight: 700; }
.stat-sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.stat-card.accent .stat-value { color: var(--accent); }
.stat-card.success .stat-value { color: var(--success); }
.stat-card.warning .stat-value { color: var(--warning); }
.stat-card.danger .stat-value { color: var(--danger); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-family: 'Sarabun', sans-serif;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: all .15s;
  /* touch-friendly */
  min-height: 40px;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.btn:hover { background: var(--bg); }
.btn:active { opacity: .85; transform: scale(.98); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; }
.btn-sm { padding: 6px 12px; font-size: 13px; min-height: 34px; }
.btn-icon { padding: 7px; width: 36px; height: 36px; }

/* ===== FORMS ===== */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group.full { grid-column: 1 / -1; }
.form-label { font-size: 13px; font-weight: 500; color: var(--text-muted); }
.form-control {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;  /* >=16px ป้องกัน iOS zoom เมื่อ focus */
  font-family: 'Sarabun', sans-serif;
  color: var(--text);
  background: var(--surface);
  transition: border-color .15s;
  width: 100%;
  min-height: 44px; /* touch target */
  -webkit-appearance: none;
  appearance: none;
}
.form-control:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.1); }
.form-control:disabled { background: var(--bg); color: var(--text-muted); }
textarea.form-control { resize: vertical; min-height: 90px; }
select.form-control { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M1 1l5 5 5-5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

.form-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  padding: 1rem 0 0.5rem;
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
  grid-column: 1 / -1;
}

/* ===== TABLE ===== */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.table th {
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: #fafafa; }

/* ===== BADGES ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-gray { background: #f1f5f9; color: #475569; }
.badge-purple { background: #ede9fe; color: #5b21b6; }

/* ===== ALERTS ===== */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 1rem;
}
.alert i { margin-top: 2px; flex-shrink: 0; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger  { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.alert-info    { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }

/* ===== TWO / THREE COL ===== */
.two-col   { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }

/* ===== UPLOAD AREA ===== */
.upload-drop {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
  color: var(--text-muted);
  -webkit-tap-highlight-color: transparent;
}
.upload-drop:hover, .upload-drop.dragover { border-color: var(--accent); background: rgba(99,102,241,.04); }
.upload-drop i { font-size: 2rem; margin-bottom: 8px; display: block; }

/* ===== MODAL ===== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--surface);
  border-radius: 14px;
  padding: 2rem;
  width: min(560px, 96vw);
  max-height: 92vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: var(--shadow-md);
}
.modal-title { font-size: 17px; font-weight: 600; margin-bottom: 1.25rem; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 1.5rem; flex-wrap: wrap; }

/* ===== SIGNATURE PAD ===== */
.sig-container {
  border: 2px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  /* ป้องกัน scroll ขณะเซ็น */
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}
.sig-container canvas {
  display: block;
  width: 100%;
  /* ความสูง default (desktop) */
  height: 200px;
  cursor: crosshair;
  touch-action: none;
}
.sig-container:focus-within,
.sig-container.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}
.sig-hint {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  padding: 6px 0 2px;
  pointer-events: none;
}
.sig-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }

/* ===== CONTRACT PREVIEW ===== */
.contract-doc {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  font-size: 14px;
  line-height: 2;
  background: #fff;
}
.contract-doc h2 { text-align: center; font-size: 16px; margin-bottom: 1rem; }
.contract-doc p { margin-bottom: 0.5rem; }
.contract-doc .contract-clause { margin-bottom: 1rem; }
.contract-doc .contract-clause strong { display: block; font-size: 14px; margin-bottom: 4px; }
.sign-row { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-top: 2rem; }
.sign-box { text-align: center; }
.sign-line { border-bottom: 1px solid var(--text); margin: 0.5rem 2rem 4px; }
.sign-label { font-size: 12px; color: var(--text-muted); }
.sign-img { max-height: 60px; display: block; margin: 0 auto; }

/* ===== LINK BOX ===== */
.link-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
  flex-wrap: wrap;
}
.link-url { font-family: monospace; font-size: 13px; flex: 1; word-break: break-all; color: var(--accent); min-width: 0; }
.timer-badge { font-size: 12px; color: var(--danger); font-weight: 500; white-space: nowrap; }

/* ===== LOGIN PAGE ===== */
.login-page {
  min-height: 100vh;
  min-height: 100dvh; /* dynamic viewport บน iOS */
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-box {
  background: var(--surface);
  border-radius: 16px;
  padding: 2.5rem;
  width: min(400px, 95vw);
  box-shadow: var(--shadow-md);
}
.login-logo { text-align: center; margin-bottom: 2rem; }
.login-logo .logo-icon { margin: 0 auto 12px; width: 56px; height: 56px; font-size: 24px; background: var(--accent); border-radius: 14px; display: flex; align-items: center; justify-content: center; color: #fff; }
.login-logo h1 { font-size: 20px; font-weight: 700; }
.login-logo p { font-size: 13px; color: var(--text-muted); }

/* ===== PUBLIC SIGN PAGE ===== */
.sign-page {
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  padding: 1.25rem 1rem 3rem; /* padding bottom เพิ่มกัน iOS bottom bar */
}
.sign-container { max-width: 680px; margin: 0 auto; }
.sign-topbar {
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 1.5rem;
  text-align: center;
}
.sign-topbar h1 { font-size: 18px; }
.sign-topbar p { font-size: 13px; opacity: .7; }

/* ===== HAMBURGER ===== */
.hamburger {
  display: none;
  position: fixed;
  top: 12px; left: 12px;
  z-index: 300;
  width: 44px; height: 44px;
  background: var(--primary);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  box-shadow: var(--shadow-md);
  -webkit-tap-highlight-color: transparent;
}
.hamburger span {
  display: block;
  width: 20px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all .2s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 99;
}
.sidebar-overlay.open { display: block; }

/* ===== RESPONSIVE — TABLET / MOBILE ===== */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {

  /* Hamburger */
  .hamburger { display: flex; }

  /* Sidebar */
  .sidebar {
    transform: translateX(-100%);
    transition: transform .25s ease;
    z-index: 200;
  }
  .sidebar.open { transform: translateX(0); }

  /* Main */
  .main-content { margin-left: 0; }
  .page-header { padding: 1rem 1rem 1rem 62px; }
  .page-body { padding: 1rem; }

  /* Grids collapse */
  .stats-grid    { grid-template-columns: 1fr 1fr; gap: 10px; }
  .form-grid     { grid-template-columns: 1fr; }
  .form-grid-3   { grid-template-columns: 1fr; }
  .two-col       { grid-template-columns: 1fr; }
  .three-col     { grid-template-columns: 1fr; }

  /* Cards */
  .card { padding: 1rem; }

  /* Table */
  .table th, .table td { padding: 8px 10px; font-size: 13px; }

  /* Buttons */
  .btn { padding: 10px 16px; font-size: 15px; min-height: 44px; }
  .btn-sm { padding: 8px 12px; font-size: 13px; min-height: 38px; }

  /* Modal */
  .modal { padding: 1.25rem; }

  /* Form controls — font-size 16px ป้องกัน iOS zoom แล้ว */
  .form-control { padding: 11px 12px; min-height: 48px; }
  select.form-control { min-height: 48px; }

  /* Signature — ใหญ่ขึ้นบนมือถือ */
  .sig-container canvas { height: 240px; }

  /* Sign page */
  .sign-page { padding: 0.75rem 0.75rem 4rem; }

  /* Contract doc */
  .contract-doc { padding: 1.25rem; font-size: 13px; }
  .sign-row { grid-template-columns: 1fr; gap: 1.25rem; }

  /* Login */
  .login-box { padding: 1.75rem 1.25rem; }

  /* Stat value smaller */
  .stat-value { font-size: 22px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .stat-card { padding: 1rem; }
  .stat-value { font-size: 20px; }
  .stat-label { font-size: 11px; }
  .page-header { flex-wrap: wrap; }
  .page-actions { width: 100%; }

  /* Signature สูงมากขึ้นบน phone เล็ก */
  .sig-container canvas { height: 260px; }

  /* ปุ่มยืนยันเซ็น full width บน mobile */
  .sign-submit-btn { width: 100% !important; padding: 16px !important; font-size: 16px !important; }
}

/* ===== PRINT ===== */
@media print {
  .sidebar, .page-header, .page-actions,
  .modal-backdrop, .hamburger, .sidebar-overlay,
  button, a.btn, .no-print { display: none !important; }
  .main-content { margin-left: 0 !important; }
  .two-col { display: block !important; }
  .card { box-shadow: none !important; border: 1px solid #ddd !important; margin-bottom: 1rem; }
}

/* ===== UTILS ===== */
.text-muted   { color: var(--text-muted); }
.text-danger  { color: var(--danger); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-center  { text-align: center; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: .5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.gap-2 { gap: .5rem; }
.flex { display: flex; align-items: center; }
.flex-end { justify-content: flex-end; }
.flex-between { justify-content: space-between; }
.d-none { display: none; }