/* Pavithra Tutions - Native Mobile App CSS Design System */

:root {
  --color-surface: #f4f6fa;
  --color-surface-dim: #d1dbec;
  --color-surface-bright: #f4f6fa;
  --color-surface-container-lowest: #ffffff;
  --color-surface-container-low: #eef4ff;
  --color-surface-container: #e5eeff;
  --color-surface-container-high: #dfe9fa;
  --color-surface-container-highest: #d9e3f4;
  --color-on-surface: #121c28;
  --color-on-surface-variant: #525765;
  --color-outline: #737784;
  --color-outline-variant: #e2e6f0;
  --color-primary: #0f52ba;
  --color-primary-dark: #003c90;
  --color-on-primary: #ffffff;
  --color-primary-container: #0f52ba;
  --color-on-primary-container: #bcceff;
  --color-secondary: #006c49;
  --color-secondary-success: #10b981;
  --color-on-secondary: #ffffff;
  --color-secondary-container: #d1fae5;
  --color-on-secondary-container: #065f46;
  --color-warning: #f59e0b;
  --color-warning-container: #fef3c7;
  --color-on-warning-container: #92400e;
  --color-error: #ba1a1a;
  --color-error-container: #ffdad6;
  --color-on-error-container: #93000a;
  --radius-sm: 0.35rem;
  --radius-md: 0.65rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;
  --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  min-height: 100vh;
  line-height: 1.45;
  padding-bottom: 85px; /* Space for bottom nav */
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 22px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
}

/* App Header - Native Mobile App Bar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface-container-lowest);
  border-bottom: 1px solid var(--color-outline-variant);
  box-shadow: 0 1px 6px rgba(0,0,0,0.02);
}

.header-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.65rem 0.75rem; /* Tight mobile padding */
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  background: var(--color-surface-container-low);
  color: var(--color-primary);
  padding: 6px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Container & Mobile Card Padding */
.main-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 0.5rem; /* Minimal edge padding for native mobile look */
}

/* Native App Cards */
.app-card {
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 1.1rem 0.9rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
  transition: all 0.2s ease;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-outline-variant);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-on-surface);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.card-title .material-symbols-outlined {
  color: var(--color-primary);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-on-surface-variant);
  text-transform: uppercase;
}

.form-control, .form-select, textarea.form-control {
  width: 100%;
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.85rem;
  font-size: 0.925rem;
  font-family: inherit;
  color: var(--color-on-surface);
  transition: all 0.15s ease;
}

.form-control:focus, .form-select:focus, textarea.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.12);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
  touch-action: manipulation;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:active {
  background-color: var(--color-primary-dark);
  transform: scale(0.98);
}

.btn-secondary {
  background-color: var(--color-surface-container-low);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
}

.btn-secondary:active {
  background-color: var(--color-surface-container);
}

.btn-success {
  background-color: var(--color-secondary-success);
  color: #ffffff;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-full {
  width: 100%;
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-pending {
  background-color: var(--color-warning-container);
  color: var(--color-on-warning-container);
}

.badge-completed {
  background-color: var(--color-secondary-container);
  color: var(--color-on-secondary-container);
}

.badge-role {
  background-color: var(--color-surface-container-high);
  color: var(--color-primary);
}

/* Child Selector Tabs (Multi-Student Parent View) */
.child-selector-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.child-tab {
  flex: 0 0 auto;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-on-surface-variant);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.15s ease;
}

.child-tab.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(15, 82, 186, 0.2);
}

/* File Upload Zone */
.upload-zone {
  border: 2px dashed var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: 1.5rem 0.75rem;
  text-align: center;
  background: var(--color-surface-container-low);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--color-primary);
  background: var(--color-surface-container);
}

.upload-icon {
  font-size: 36px;
  color: var(--color-primary);
}

.preview-image {
  max-width: 100%;
  max-height: 220px;
  border-radius: var(--radius-md);
  object-fit: cover;
  border: 1px solid var(--color-outline-variant);
  margin-top: 0.5rem;
}

/* Simulated Progress Bar */
.progress-bar-container {
  display: none;
  width: 100%;
  background: var(--color-surface-container-high);
  border-radius: var(--radius-full);
  height: 12px;
  overflow: hidden;
  margin-top: 1rem;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary-success));
  border-radius: var(--radius-full);
  transition: width 0.15s linear;
}

.progress-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-align: center;
  margin-top: 0.35rem;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.stat-card {
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-container-low);
  color: var(--color-primary);
  flex-shrink: 0;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-on-surface-variant);
  font-weight: 500;
}

/* Bottom Navigation Bar for Mobile */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--color-surface-container-lowest);
  border-top: 1px solid var(--color-outline-variant);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 50;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.03);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  text-decoration: none;
  color: var(--color-on-surface-variant);
  font-size: 0.7rem;
  font-weight: 500;
  width: 25%;
  text-align: center;
}

.nav-item.active {
  color: var(--color-primary);
  font-weight: 700;
}

.nav-item .material-symbols-outlined {
  font-size: 22px;
}

/* Lightbox Modal & Photo Zoom */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(12, 18, 26, 0.85);
  backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: var(--color-surface-container-lowest);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 92vh;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0,0,0,0.3);
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.1rem;
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--color-surface-container);
  border: none;
  border-radius: var(--radius-full);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
}

.image-zoom-viewport {
  overflow: auto;
  max-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0d131c;
  border-radius: var(--radius-md);
  margin: 0.75rem 0;
  padding: 0.5rem;
}

.zoom-image {
  max-width: 100%;
  transition: transform 0.2s ease;
  transform-origin: center center;
}

.zoom-controls {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
}

/* Utilities */
.text-muted { color: var(--color-on-surface-variant); }
.text-primary { color: var(--color-primary); }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0.75rem; }

@media (min-width: 768px) {
  body { padding-bottom: 20px; }
  .bottom-nav { display: none; }
  .main-container { padding: 1.5rem 1rem; }
}