/* =========================================================
   Theme Variables
========================================================= */

:root,
.theme-mode-light {
  --page-bg: #f5f7fb;
  --surface-bg: #ffffff;
  --surface-muted-bg: #f9fafb;
  --border-color: #e5e7eb;

  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --primary-border: #dbeafe;

  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #7f1d1d;
  --danger-heading: #b91c1c;
  --danger-button: #dc2626;
  --danger-button-hover: #b91c1c;

  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-menu: 0 12px 28px rgba(15, 23, 42, 0.14);
}

.theme-mode-dark {
  --page-bg: #0f172a;
  --surface-bg: #111827;
  --surface-muted-bg: #1f2937;
  --border-color: #374151;

  --text-primary: #f9fafb;
  --text-secondary: #e5e7eb;
  --text-muted: #9ca3af;

  --primary-soft: rgba(37, 99, 235, 0.16);
  --primary-border: rgba(96, 165, 250, 0.35);

  --danger-bg: rgba(127, 29, 29, 0.22);
  --danger-border: rgba(248, 113, 113, 0.45);
  --danger-text: #fecaca;
  --danger-heading: #fca5a5;

  --success-bg: rgba(6, 95, 70, 0.25);
  --success-border: rgba(167, 243, 208, 0.35);
  --success-text: #a7f3d0;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.28);
  --shadow-menu: 0 12px 28px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  .theme-mode-system {
    --page-bg: #0f172a;
    --surface-bg: #111827;
    --surface-muted-bg: #1f2937;
    --border-color: #374151;

    --text-primary: #f9fafb;
    --text-secondary: #e5e7eb;
    --text-muted: #9ca3af;

    --primary-soft: rgba(37, 99, 235, 0.16);
    --primary-border: rgba(96, 165, 250, 0.35);

    --danger-bg: rgba(127, 29, 29, 0.22);
    --danger-border: rgba(248, 113, 113, 0.45);
    --danger-text: #fecaca;
    --danger-heading: #fca5a5;

    --success-bg: rgba(6, 95, 70, 0.25);
    --success-border: rgba(167, 243, 208, 0.35);
    --success-text: #a7f3d0;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.18);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.22);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.28);
    --shadow-menu: 0 12px 28px rgba(0, 0, 0, 0.35);
  }
}

.theme-color-default {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --primary-border: #dbeafe;
}

.theme-color-ocean {
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-soft: #e0f2fe;
  --primary-border: #bae6fd;
}

.theme-color-forest {
  --primary: #16a34a;
  --primary-hover: #15803d;
  --primary-soft: #ecfdf5;
  --primary-border: #bbf7d0;
}

.theme-color-sunset {
  --primary: #f97316;
  --primary-hover: #ea580c;
  --primary-soft: #fff7ed;
  --primary-border: #fed7aa;
}

/* =========================================================
   Base
========================================================= */

html {
  min-height: 100%;
  background: var(--page-bg);
}

body {
  min-height: 100vh;
  background: var(--page-bg);
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.app-body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text-primary);
  transition: background 0.2s ease, color 0.2s ease;
}

img {
  max-width: 100%;
}

h1,
h2,
h3 {
  color: var(--text-primary);
  margin-top: 0;
}

p,
li {
  color: var(--text-secondary);
  line-height: 1.6;
}

hr,
.section-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1.5rem 0;
}

/* =========================================================
   Layout
========================================================= */

.page-shell {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1.5rem 2rem;
  flex: 1;
}

.app-footer {
  margin-top: auto;
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: var(--surface-bg);
  font-size: 0.9rem;
  opacity: 0.85;
}

.page-card {
  background: var(--surface-bg);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 2rem;
}

.page-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.page-actions-left,
.page-actions-right,
.page-actions-secondary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-actions-primary {
  flex-grow: 1;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

/* =========================================================
   Navbar
========================================================= */

.navbar {
  background: var(--surface-bg);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.navbar-left,
.navbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.navbar-left {
  flex-shrink: 0;
}

.navbar-right {
  justify-content: flex-end;
  flex: 1;
  min-width: 0;
}

.brand-link {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  margin-right: 1rem;
}

.brand-link:hover {
  color: var(--primary);
}

.nav-link {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  background: transparent;
  transition: all 0.15s ease;
}

.nav-link:hover {
  background: var(--surface-muted-bg);
  border-color: var(--primary-border);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.desktop-nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  width: 100%;
}

.desktop-nav-actions form,
.user-menu-dropdown form {
  margin: 0;
}

.mobile-user-menu {
  display: none;
}

.nav-button {
  font: inherit;
}

/* =========================================================
   User Menu
========================================================= */

.user-menu {
  position: relative;
}

.user-menu-button {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.55rem 0.75rem;
  font-size: 1.2rem;
  line-height: 1;
}

.user-menu-button:hover {
  background: var(--surface-muted-bg);
  color: var(--text-primary);
}

.user-menu-dropdown {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 0.5rem);
  min-width: 180px;
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-menu);
  padding: 0.5rem;
  z-index: 20;
}

.user-menu.open .user-menu-dropdown {
  display: block;
}

.user-menu-link {
  display: block;
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  text-align: left;
  background: transparent;
  border: none;
  box-sizing: border-box;
}

.user-menu-link:hover {
  background: var(--surface-muted-bg);
  color: var(--text-primary);
}

.user-menu-button-link {
  cursor: pointer;
}

/* =========================================================
   Buttons
========================================================= */

.button-link,
input[type="submit"],
button {
  display: inline-block;
  background: var(--primary);
  color: #ffffff;
  text-decoration: none;
  border: 1px solid var(--primary);
  border-radius: 10px;
  padding: 0.7rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button-link:hover,
input[type="submit"]:hover,
button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.button-link.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.button-link.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.button-link.secondary,
.button-secondary,
a.button-link.subtle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.button-link.secondary:hover,
.button-secondary:hover,
a.button-link.subtle:hover,
.button-link.subtle:hover {
  background: var(--surface-muted-bg);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.button-link.large {
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
}

.button-secondary {
  margin-left: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 500;
}

.button-danger {
  background: var(--danger-button);
  color: #ffffff;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 0.5rem;
  font-weight: 600;
}

.button-danger:hover {
  background: var(--danger-button-hover);
}

/* =========================================================
   Flash Messages
========================================================= */

.flash {
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.flash.notice {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.flash.alert {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-border);
}

/* =========================================================
   Forms
========================================================= */

.form-card {
  max-width: 640px;
}

.detail-card,
.form-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 1rem;
}

.stacked-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field label {
  font-weight: 600;
  color: var(--text-secondary);
}

.form-field input,
.form-field select,
.form-field textarea,
.report-filter-field select {
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--surface-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-muted);
}

.form-actions {
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.form-errors {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-border);
  border-radius: 12px;
  padding: 1rem;
}

.form-errors h2 {
  margin-top: 0;
  font-size: 1rem;
  color: var(--danger-heading);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* =========================================================
   Cards + Shared Grids
========================================================= */

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.detail-section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.check-in-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.measurement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
  align-items: stretch;
}

.check-in-card,
.measurement-card,
.photo-card,
.profile-card {
  background: var(--surface-muted-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
}

.check-in-card,
.measurement-card {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.profile-card {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: box-shadow 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.profile-card-link,
.check-in-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.profile-card-link:hover .profile-card,
.check-in-card-link:hover .check-in-card {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-border);
}

.profile-card-link:hover .profile-card {
  transform: translateY(-2px);
}

.profile-card-header h2 {
  margin: 0;
  color: var(--text-primary);
}

.profile-card-body {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.empty-state-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-top: 1rem;
  max-width: 520px;
}

.check-in-card-header h3,
.measurement-card-header h3 {
  margin: 0;
}

.check-in-card-header h3 a,
.measurement-card-header h3 a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
}

.check-in-card-header h3 a:hover,
.measurement-card-header h3 a:hover {
  color: var(--primary);
}

.check-in-card-body p,
.measurement-card-body p {
  margin: 0.35rem 0;
}

.check-in-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.card-hint-row {
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

.card-hint-arrow {
  font-size: 1rem;
  line-height: 1;
  color: var(--primary);
}

.card-hint-mobile {
  display: none;
}

.check-in-card.disabled {
  cursor: default;
  opacity: 0.95;
}

.check-in-card.disabled:hover {
  transform: none;
}

.card-link.muted {
  color: var(--text-muted);
  font-weight: 500;
}

/* =========================================================
   Home Page
========================================================= */

.home-hero {
  background: linear-gradient(135deg, var(--primary-soft), var(--surface-bg));
  border: 1px solid var(--primary-border);
  border-radius: 20px;
  padding: 3rem 2rem;
  margin-bottom: 2rem;
}

/* Dark mode override for hero */
.theme-mode-dark .home-hero {
  background: linear-gradient(135deg, var(--surface-muted-bg), var(--surface-bg));
  border-color: var(--border-color);
}

@media (prefers-color-scheme: dark) {
  .theme-mode-system .home-hero {
    background: linear-gradient(135deg, var(--surface-muted-bg), var(--surface-bg));
    border-color: var(--border-color);
  }
}

.home-hero-content {
  max-width: 720px;
}

.home-hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.home-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 640px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.home-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.info-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.info-card h2 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.info-list {
  margin: 0;
  padding-left: 1.2rem;
}

.info-list li {
  margin-bottom: 0.6rem;
}

/* =========================================================
   Reports + Charts
========================================================= */

.report-header-card,
.report-card,
.chart-card,
.top-chart-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.report-header-card {
  border-radius: 18px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.report-header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.report-subtitle {
  margin: 0.35rem 0 0;
  color: var(--text-secondary);
}

.report-header-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.report-filter-form {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.report-filter-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: end;
}

.report-filter-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 220px;
}

.report-filter-field label {
  font-weight: 600;
  color: var(--text-secondary);
}

.report-filter-actions {
  display: flex;
  align-items: end;
}

.report-filter-label {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.report-card {
  border-radius: 14px;
  padding: 1.25rem;
}

.report-card h2 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.report-card-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.report-summary p {
  margin: 0.35rem 0;
}

.report-history ul {
  padding-left: 1rem;
  margin: 0;
}

.report-history li {
  margin-bottom: 0.35rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  width: 100%;
}

.chart-card,
.top-chart-card {
  border-radius: 18px;
  padding: 1rem;
  width: 100%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.top-chart-card {
  margin-bottom: 1.25rem;
}

.chart-card h2 {
  margin: 0 0 1rem 0;
}

.chart-wrapper {
  width: 90%;
  min-width: 0;
}

.chart-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.chart-card-header h2 {
  margin: 0;
}

.chart-toggle-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.chart-toggle-button {
  display: inline-block;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--surface-bg);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.chart-toggle-button:hover {
  background: var(--surface-muted-bg);
  border-color: var(--primary-border);
  color: var(--text-primary);
}

.chart-toggle-button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

/* =========================================================
   Photos
========================================================= */

.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.photo-card {
  padding: 0.75rem;
}

.photo-card img {
  width: 100%;
  min-width: 0;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 10px;
  display: block;
}

.photo-card p {
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.5rem;
}

.progress-photo {
  object-fit: cover;
  border-radius: 12px;
  display: block;
}

.photo-card-image-wrapper {
  position: relative;
}

.photo-delete-button {
  position: absolute;
  bottom: 0.6rem;
  right: 0.6rem;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.85);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.18);
}

.photo-delete-button:hover {
  background: rgba(185, 28, 28, 0.95);
}

.photo-delete-button form {
  margin: 0;
}

.existing-photo-preview {
  margin: 0.5rem 0;
}

.existing-photo-preview img {
  width: 90px;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.photo-preview-wrapper {
  position: relative;
  display: inline-block;
  margin: 0.4rem 0;
}

.photo-preview-thumbnail {
  height: 38px;
  width: auto;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.photo-preview-wrapper:hover .photo-preview-thumbnail {
  transform: scale(3.5);
  z-index: 10;
  position: relative;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.photo-preview-hint {
  position: absolute;
  bottom: 120%;
  left: 0;
  font-size: 0.75rem;
  background: #111827;
  color: #ffffff;
  padding: 4px 8px;
  border-radius: 6px;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 0.15s ease;
}

.photo-preview-wrapper:hover .photo-preview-hint {
  opacity: 1;
}

.photo-upload-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* =========================================================
   Photo Comparison
========================================================= */

.photo-timeline-frame-content {
  animation: photoFadeIn 260ms ease-out;
}

.photo-comparison-title {
  text-align: center;
  margin-bottom: 0.5rem;
}

.photo-comparison-toggle-row {
  max-width: 520px;
  margin: 0 auto 0.25rem;
  display: flex;
  justify-content: center;
}

.photo-comparison-toggle-row .chart-toggle-group {
  display: flex;
  justify-content: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.photo-comparison {
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
}

.photo-comparison-help {
  margin: 0 0 0.75rem;
  color: var(--text-secondary);
  text-align: center;
}

.photo-comparison-date-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.photo-label-block {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.photo-label-block.right {
  text-align: right;
}

.photo-direction-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
}

.photo-comparison-image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  --comparison-position: 50%;
}

.photo-comparison-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  display: block;
}

.base-image {
  z-index: 1;
}

.photo-comparison-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  clip-path: inset(0 calc(100% - var(--comparison-position)) 0 0);
}

.overlay-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  display: block;
}

.photo-comparison-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--comparison-position);
  width: 3px;
  background: var(--surface-bg);
  box-shadow: 0 0 0 1px rgba(17, 24, 39, 0.2);
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 3;
}

.photo-comparison-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--surface-bg);
  box-shadow: 0 0 0 1px rgba(17, 24, 39, 0.2);
  transform: translate(-50%, -50%);
}

.photo-comparison-slider {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: ew-resize;
  z-index: 5;
}

.photo-comparison-meta {
  margin-top: 0.75rem;
}

.photo-comparison-meta p {
  margin: 0.25rem 0;
  text-align: left;
}

.photo-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.photo-empty-state .button-link {
  margin-top: 0.75rem;
}

/* =========================================================
   Measurement Details
========================================================= */

.measurement-photo-card {
  max-width: 320px;
}

.measurement-summary-list {
  margin: 0;
  padding-left: 1rem;
}

.measurement-summary-list li {
  margin-bottom: 0.5rem;
}

/* =========================================================
   Settings / Danger Zone
========================================================= */

.danger-zone {
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--danger-border);
  background: var(--danger-bg);
  border-radius: 0.75rem;
}

.danger-zone h2 {
  color: var(--danger-heading);
  margin-bottom: 0.5rem;
}

.danger-text {
  color: var(--danger-text);
  margin-bottom: 1rem;
}

/* --- Theme Mode --- */

.theme-mode-toggle-group {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.25rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--surface-muted-bg);
  flex-wrap: wrap;
}

.theme-mode-option {
  cursor: pointer;
}

.theme-mode-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.theme-mode-option span {
  display: inline-block;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}

.theme-mode-option input:checked + span {
  background: var(--primary);
  color: #ffffff;
}

/* --- Theme Swatches --- */

.theme-swatch-row {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  align-items: center;
}

.theme-swatch-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.theme-swatch-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.theme-swatch {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.theme-swatch-default {
  background: #2563eb;
}

.theme-swatch-ocean {
  background: #0ea5e9;
}

.theme-swatch-forest {
  background: #16a34a;
}

.theme-swatch-sunset {
  background: #f97316;
}

.theme-swatch-option input:checked + .theme-swatch {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
  transform: scale(1.08);
}

/* =========================================================
   Animations
========================================================= */

@keyframes photoFadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================================
   Responsive
========================================================= */

@media (max-width: 900px) {
  .check-in-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .desktop-nav-actions {
    display: none;
  }

  .mobile-user-menu {
    display: block;
    margin-left: auto;
  }

  .navbar-right {
    flex: 0;
  }
}

@media (max-width: 768px) {
  .navbar-inner {
    align-items: center;
    justify-content: space-between;
  }

  .navbar-left {
    gap: 0.5rem;
  }

  .brand-link {
    font-size: 1.1rem;
    margin-right: 0.25rem;
  }

  .user-menu {
    margin-left: auto;
  }

  .user-menu-dropdown {
    right: 0;
    left: auto;
  }

  .page-shell {
    margin: 1rem auto;
    padding: 0 1rem 1.5rem;
  }

  .page-card,
  .detail-card,
  .form-card,
  .report-header-card,
  .empty-state-card,
  .info-card {
    padding: 1.25rem;
  }

  .page-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-actions-left,
  .page-actions-right {
    width: 100%;
    flex-wrap: wrap;
  }

  .page-actions-left .button-link,
  .page-actions-right .button-link,
  .page-actions-left form,
  .page-actions-right form,
  .page-actions-left button,
  .page-actions-right button,
  .page-actions-left input[type="submit"],
  .page-actions-right input[type="submit"] {
    width: 100%;
    text-align: center;
  }

  .detail-grid,
  .report-card-body,
  .profile-grid,
  .check-in-grid,
  .measurement-grid,
  .report-grid,
  .photo-grid,
  .home-grid,
  .chart-grid {
    grid-template-columns: 1fr;
  }

  .report-header-top,
  .report-filter-form,
  .report-filter-group {
    flex-direction: column;
    align-items: stretch;
  }

  .report-header-actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .report-header-actions .button-link {
    display: block;
    width: 100%;
    text-align: center;
    box-sizing: border-box;
  }

  .report-filter-field {
    min-width: 0;
    width: 100%;
  }

  .report-filter-field select,
  .form-field input,
  .form-field select,
  .form-field textarea {
    width: 100%;
    box-sizing: border-box;
  }

  .photo-card img,
  .progress-photo {
    width: 100%;
    height: auto;
    max-height: none;
  }

  .photo-preview-wrapper:hover .photo-preview-thumbnail {
    transform: scale(2.2);
  }

  .photo-comparison-date-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    align-items: start;
  }

  .photo-label-block,
  .photo-label-block.right {
    text-align: center;
    font-size: 0.85rem;
  }

  .photo-direction-hint {
    font-size: 0.72rem;
    white-space: nowrap;
  }

  .card-hint-desktop {
    display: none;
  }

  .card-hint-mobile {
    display: inline;
  }

  .home-hero {
    padding: 2rem 1.25rem;
  }

  .home-hero h1 {
    font-size: 1.8rem;
  }

  .home-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    flex-direction: column;
    align-items: stretch;
  }

  .home-actions .button-link {
    width: 100%;
    text-align: center;
    box-sizing: border-box;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  h3 {
    font-size: 1.05rem;
  }
}

@media (max-width: 420px) {
  .photo-comparison-date-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .photo-label-block,
  .photo-label-block.right {
    text-align: center;
  }
}