/* ============================================================
   Smile Vision AI — Common Stylesheet (White Premium Theme)
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Primary */
  --primary: #0066FF;
  --primary-light: #4D94FF;
  --primary-dark: #0044CC;
  --primary-bg: #EBF3FF;

  /* Accent */
  --accent: #00D4AA;
  --accent-light: #33DFBD;
  --accent-dark: #00A888;

  /* Neutral */
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Semantic */
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --info: #3B82F6;

  /* Surface */
  --surface: #FFFFFF;
  --surface-elevated: #FFFFFF;
  --bg: #F8FAFC;

  /* Text Hierarchy */
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-tertiary: #64748B;
  --text-disabled: #CBD5E1;
  --text-on-primary: #FFFFFF;
  --text-on-primary-secondary: #E0E7FF;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.09), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.05);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transition */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 0.25s;

  /* Layout */
  --sidebar-w: 260px;
  --header-h: 64px;
  --content-max: 1400px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, select, textarea { font: inherit; }

/* --- Typography Hierarchy --- */
h1 { font-size: 2.25rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; color: var(--text-primary); }
h2 { font-size: 1.75rem; font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; color: var(--text-primary); }
h3 { font-size: 1.25rem; font-weight: 700; line-height: 1.4; color: var(--text-primary); }
h4 { font-size: 1.1rem; font-weight: 600; line-height: 1.4; color: var(--text-secondary); }
p  { color: var(--text-secondary); line-height: 1.7; }
small, .caption { font-size: 0.8125rem; color: var(--text-tertiary); }

/* --- Sidebar Layout (White Premium) --- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: #FFFFFF;
  border-right: 1px solid var(--gray-200);
  color: var(--text-primary);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform var(--duration) var(--ease);
  box-shadow: 2px 0 12px rgba(0,0,0,0.04);
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--gray-100);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-logo-img {
  width: 100%;
  max-width: 200px;
  height: auto;
  filter: none;
}

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }

.nav-section-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: 16px 12px 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--duration) var(--ease);
  position: relative;
}

.nav-item:hover {
  background: var(--gray-50);
  color: var(--primary);
}
.nav-item:hover .nav-item-icon {
  background: var(--primary-bg);
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 600;
}
.nav-item.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--primary);
  border-radius: 0 2px 2px 0;
}
.nav-item.active .nav-item-icon {
  background: var(--primary-bg);
  color: var(--primary);
}

.nav-item-icon {
  font-size: 1rem;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--duration) var(--ease);
}

.sidebar-footer {
  padding: 12px 12px 16px;
  border-top: 1px solid var(--gray-100);
}

.sidebar-version {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  margin-top: 10px;
  text-align: center;
  letter-spacing: 0.02em;
}

.sidebar-api-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  text-align: left;
}
.sidebar-api-btn:hover {
  background: var(--primary-bg);
  color: var(--primary);
  border-color: rgba(0,102,255,0.2);
}
.sidebar-api-btn.connected {
  border-color: rgba(0,212,170,0.35);
  background: rgba(0,212,170,0.06);
}
.sidebar-api-btn.connected:hover {
  background: rgba(0,212,170,0.1);
}
.sidebar-api-icon { font-size: 1rem; flex-shrink: 0; }
.sidebar-api-text { display: flex; flex-direction: column; min-width: 0; }
.sidebar-api-status {
  font-size: 0.6875rem;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-api-status.on { color: var(--accent-dark); }
.sidebar-api-status.off { color: var(--text-tertiary); }

/* --- Main Content --- */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
}

.header {
  height: var(--header-h);
  background: #FFFFFF;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.header-title { font-size: 1.125rem; font-weight: 700; }
.header-actions { display: flex; align-items: center; gap: 12px; }

.content { padding: 32px; max-width: var(--content-max); margin: 0 auto; }

/* --- Cards (Premium White) --- */
.card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0,102,255,0.2);
}

.card-header { padding: 20px 24px; border-bottom: 1px solid var(--gray-100); }
.card-body { padding: 24px; }
.card-footer { padding: 16px 24px; border-top: 1px solid var(--gray-100); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--duration) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-on-primary);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-secondary {
  background: var(--gray-100);
  color: var(--text-primary);
}
.btn-secondary:hover { background: var(--gray-200); }

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #FFF;
}
.btn-accent:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-outline {
  border: 1.5px solid var(--gray-300);
  color: var(--text-secondary);
  background: transparent;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); }

.btn-danger { background: var(--danger); color: #FFF; }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius-md); }
.btn-sm { padding: 6px 14px; font-size: 0.8125rem; }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: var(--radius-sm); }

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-primary { background: var(--primary-bg); color: var(--primary); }
.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-danger { background: #FEE2E2; color: #991B1B; }

/* --- KPI Cards (Premium White) --- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.kpi-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 0 2px 2px 0;
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0,102,255,0.2);
}

.kpi-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.kpi-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 8px 0 4px;
}

.kpi-change {
  font-size: 0.8125rem;
  font-weight: 600;
}
.kpi-change.up { color: var(--success); }
.kpi-change.down { color: var(--danger); }

/* --- Tables --- */
.table-wrap { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; }
th {
  text-align: left;
  padding: 12px 16px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--gray-200);
  background: var(--gray-50);
}
td {
  padding: 14px 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--gray-100);
}
tr:hover td { background: var(--gray-50); }

/* --- Form Elements --- */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-primary);
  background: #FFFFFF;
  transition: border-color var(--duration) var(--ease);
}
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,102,255,0.1); }

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration) var(--ease);
}
.modal-overlay.active { opacity: 1; pointer-events: all; }

.modal {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-200);
  transform: translateY(20px);
  transition: transform var(--duration) var(--ease);
}
.modal-overlay.active .modal { transform: translateY(0); }
.modal-header { padding: 24px 28px 0; }
.modal-body { padding: 20px 28px; }
.modal-footer { padding: 16px 28px 24px; display: flex; gap: 12px; justify-content: flex-end; }

/* --- Spinner --- */
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Toast --- */
.toast-container {
  position: fixed;
  top: 20px; right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 14px 20px;
  border-radius: var(--radius-md);
  background: var(--gray-900);
  color: #FFF;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s var(--ease);
}
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } }

/* --- Hamburger (mobile) --- */
.hamburger {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }

  .main { margin-left: 0; }

  .hamburger { display: flex; }

  .header { padding: 0 16px; }
  .content { padding: 20px 16px; }

  .kpi-grid { grid-template-columns: 1fr; }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.375rem; }
}

@media (max-width: 480px) {
  .content { padding: 16px 12px; }
  .card-body { padding: 16px; }
  .btn-lg { padding: 12px 20px; font-size: 0.9rem; }
}

/* --- Premium Footer (White) --- */
.premium-footer {
  background: #F8FAFC;
  border-top: 1px solid var(--gray-200);
  color: var(--text-secondary);
  padding: 48px 32px 24px;
  margin-top: 64px;
}
.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--gray-200);
}
.footer-brand-logo {
  max-width: 180px;
  margin-bottom: 16px;
  filter: none;
}
.footer-brand p {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  line-height: 1.7;
  max-width: 320px;
}
.footer-section h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}
.footer-link {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  padding: 5px 0;
  transition: color var(--duration) var(--ease);
}
.footer-link:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.footer-copy {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}
.footer-badges {
  display: flex; gap: 8px; flex-wrap: wrap;
}
.footer-badge {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  font-weight: 600;
  border: 1px solid var(--gray-200);
  color: var(--text-tertiary);
  background: #FFFFFF;
}
.footer-cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.brochure-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: linear-gradient(135deg, #0066FF 0%, #0044CC 100%);
  color: #FFF;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--duration) var(--ease);
  border: none;
  box-shadow: 0 4px 12px rgba(0, 102, 255, 0.2);
}
.brochure-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.3);
  background: linear-gradient(135deg, #0077FF 0%, #0055DD 100%);
}
.brochure-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 102, 255, 0.2);
}
.brochure-icon {
  font-size: 1.1rem;
}
.brochure-text {
  white-space: nowrap;
}

@media (max-width: 768px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }
  .footer-left {
    flex-direction: column;
  }
  .footer-cta {
    width: 100%;
  }
  .brochure-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* --- Utility --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }
.gap-24 { gap: 24px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.w-full { width: 100%; }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}