@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=swap');

/* === MD3 Color Tokens - Light Theme === */
:root,
[data-theme="light"] {
  --md-sys-color-background: #FFFBFE;
  --md-sys-color-error: #B3261E;
  --md-sys-color-error-container: #F9DEDC;
  --md-sys-color-inverse-on-surface: #F4EFF4;
  --md-sys-color-inverse-primary: #D0BCFF;
  --md-sys-color-inverse-surface: #313033;
  --md-sys-color-on-background: #1C1B1F;
  --md-sys-color-on-error: #FFFFFF;
  --md-sys-color-on-error-container: #410E0B;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-on-primary-container: #21005D;
  --md-sys-color-on-secondary: #FFFFFF;
  --md-sys-color-on-secondary-container: #1D192B;
  --md-sys-color-on-surface: #1C1B1F;
  --md-sys-color-on-surface-variant: #49454F;
  --md-sys-color-on-tertiary: #FFFFFF;
  --md-sys-color-on-tertiary-container: #31111D;
  --md-sys-color-outline: #79747E;
  --md-sys-color-outline-variant: #CAC4D0;
  --md-sys-color-primary: #6750A4;
  --md-sys-color-primary-container: #EADDFF;
  --md-sys-color-scrim: #000000;
  --md-sys-color-secondary: #625B71;
  --md-sys-color-secondary-container: #E8DEF8;
  --md-sys-color-shadow: #000000;
  --md-sys-color-surface: #FFFBFE;
  --md-sys-color-surface-container: #F3EDF7;
  --md-sys-color-surface-container-high: #ECE6F0;
  --md-sys-color-surface-container-highest: #E6E0E9;
  --md-sys-color-surface-container-low: #F7F2FA;
  --md-sys-color-surface-container-lowest: #FFFFFF;
  --md-sys-color-surface-variant: #E7E0EC;
  --md-sys-color-tertiary: #7D5260;
  --md-sys-color-tertiary-container: #FFD8E4;

  --md-elevation-1: 0 1px 2px rgba(0,0,0,0.2), 0 1px 3px 1px rgba(0,0,0,0.1);
  --md-elevation-2: 0 1px 2px rgba(0,0,0,0.2), 0 2px 6px 2px rgba(0,0,0,0.1);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.2);

  --nav-drawer-width: 280px;
}

/* === MD3 Color Tokens - Dark Theme === */
[data-theme="dark"] {
  --md-sys-color-background: #1C1B1F;
  --md-sys-color-error: #F2B8B5;
  --md-sys-color-error-container: #8C1D18;
  --md-sys-color-inverse-on-surface: #313033;
  --md-sys-color-inverse-primary: #6750A4;
  --md-sys-color-inverse-surface: #E6E1E5;
  --md-sys-color-on-background: #E6E1E5;
  --md-sys-color-on-error: #601410;
  --md-sys-color-on-error-container: #F9DEDC;
  --md-sys-color-on-primary: #381E72;
  --md-sys-color-on-primary-container: #EADDFF;
  --md-sys-color-on-secondary: #332D41;
  --md-sys-color-on-secondary-container: #E8DEF8;
  --md-sys-color-on-surface: #E6E1E5;
  --md-sys-color-on-surface-variant: #CAC4D0;
  --md-sys-color-on-tertiary: #492532;
  --md-sys-color-on-tertiary-container: #FFD8E4;
  --md-sys-color-outline: #938F99;
  --md-sys-color-outline-variant: #49454F;
  --md-sys-color-primary: #D0BCFF;
  --md-sys-color-primary-container: #4F378B;
  --md-sys-color-scrim: #000000;
  --md-sys-color-secondary: #CCC2DC;
  --md-sys-color-secondary-container: #4A4458;
  --md-sys-color-shadow: #000000;
  --md-sys-color-surface: #1C1B1F;
  --md-sys-color-surface-container: #211F26;
  --md-sys-color-surface-container-high: #2B2930;
  --md-sys-color-surface-container-highest: #36343B;
  --md-sys-color-surface-container-low: #1D1B20;
  --md-sys-color-surface-container-lowest: #0F0D13;
  --md-sys-color-surface-variant: #49454F;
  --md-sys-color-tertiary: #EFB8C8;
  --md-sys-color-tertiary-container: #633B48;

  --md-elevation-1: 0 1px 2px rgba(0,0,0,0.5), 0 1px 3px 1px rgba(0,0,0,0.3);
  --md-elevation-2: 0 1px 2px rgba(0,0,0,0.5), 0 2px 6px 2px rgba(0,0,0,0.3);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.3), 0 1px 3px rgba(0,0,0,0.5);
}

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

html {
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

body {
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  font-family: 'Roboto', sans-serif;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* === Material Symbols === */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  font-size: 24px;
  line-height: 1;
  user-select: none;
  vertical-align: middle;
}

/* === App Shell === */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* === Navigation Drawer === */
.nav-drawer {
  background-color: var(--md-sys-color-surface-container-low);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  flex-direction: column;
  height: 100vh;
  left: 0;
  overflow-y: auto;
  position: fixed;
  top: 0;
  transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1);
  width: var(--nav-drawer-width);
  z-index: 200;
}

.nav-drawer-header {
  align-items: center;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  gap: 12px;
  height: 64px;
  min-height: 64px;
  padding: 0 20px;
}

.nav-drawer-header .material-symbols-outlined {
  color: var(--md-sys-color-primary);
  font-size: 28px;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 28;
}

.nav-drawer-title {
  color: var(--md-sys-color-on-surface);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.nav-drawer-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 2px;
  padding: 12px 12px 8px;
}

.nav-item {
  align-items: center;
  border-radius: 50px;
  color: var(--md-sys-color-on-surface-variant);
  display: flex;
  font-size: 14px;
  font-weight: 500;
  gap: 12px;
  letter-spacing: 0.1px;
  overflow: hidden;
  padding: 12px 16px;
  position: relative;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.nav-item::before {
  background-color: currentColor;
  border-radius: inherit;
  content: '';
  inset: 0;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  transition: opacity 0.2s;
}

.nav-item:hover {
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
}

.nav-item:hover::before { opacity: 0.08; }
.nav-item:active::before { opacity: 0.12; }

.nav-item--active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.nav-item--active .nav-item-icon {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

.nav-item--active:hover {
  color: var(--md-sys-color-on-secondary-container);
}

.nav-item-icon {
  flex-shrink: 0;
  font-size: 22px;
}

.nav-drawer-footer {
  border-top: 1px solid var(--md-sys-color-outline-variant);
  padding: 8px 12px 16px;
}

.nav-user {
  align-items: center;
  display: flex;
  gap: 12px;
  padding: 12px 16px 8px;
}

.nav-user-avatar {
  align-items: center;
  background-color: var(--md-sys-color-primary-container);
  border-radius: 50%;
  color: var(--md-sys-color-on-primary-container);
  display: flex;
  flex-shrink: 0;
  font-size: 16px;
  font-weight: 500;
  height: 40px;
  justify-content: center;
  width: 40px;
}

.nav-user-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.nav-user-name {
  color: var(--md-sys-color-on-surface);
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-user-role {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* === Nav Overlay (mobile) === */
.nav-overlay {
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  inset: 0;
  opacity: 0;
  position: fixed;
  transition: opacity 0.3s;
  z-index: 199;
}

.nav-overlay.active {
  display: block;
  opacity: 1;
}

/* === Main Container === */
.main-container {
  display: flex;
  flex: 1;
  flex-direction: column;
  margin-left: var(--nav-drawer-width);
  min-height: 100vh;
  transition: margin-left 0.3s cubic-bezier(0.2, 0, 0, 1);
}

/* === Top App Bar === */
.top-app-bar {
  align-items: center;
  background-color: var(--md-sys-color-surface-container);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  gap: 4px;
  height: 64px;
  padding: 0 8px 0 4px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-app-bar-title {
  color: var(--md-sys-color-on-surface);
  flex: 1;
  font-size: 20px;
  font-weight: 500;
  overflow: hidden;
  padding: 0 8px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.top-app-bar-actions {
  align-items: center;
  display: flex;
  gap: 4px;
}

/* === Icon Button === */
.icon-button {
  align-items: center;
  background: transparent;
  border: none;
  border-radius: 50%;
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  display: flex;
  flex-shrink: 0;
  height: 48px;
  justify-content: center;
  overflow: hidden;
  position: relative;
  transition: color 0.2s;
  width: 48px;
}

.icon-button::before {
  background-color: currentColor;
  border-radius: 50%;
  content: '';
  inset: 0;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  transition: opacity 0.2s;
}

.icon-button:hover { color: var(--md-sys-color-on-surface); }
.icon-button:hover::before { opacity: 0.08; }
.icon-button:active::before { opacity: 0.12; }

/* === Main Content === */
.main-content {
  flex: 1;
  padding: 28px 24px;
  width: 100%;
}

/* === Page Content === */
.page-content {
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 1200px;
}

/* === Cards === */
.card {
  background-color: var(--md-sys-color-surface-container);
  border-radius: 12px;
  box-shadow: var(--md-elevation-1);
  padding: 16px;
  transition: box-shadow 0.2s;
}

.card:hover { box-shadow: var(--md-elevation-2); }

.card--elevated {
  background-color: var(--md-sys-color-surface-container-low);
  box-shadow: var(--md-elevation-2);
}

/* === Stats Grid === */
.stats-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

.stat-card {
  align-items: center;
  cursor: default;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
  padding: 24px 16px;
  text-align: center;
}

.stat-card-icon {
  color: var(--md-sys-color-primary);
  font-size: 32px;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 32;
}

.stat-card-value {
  color: var(--md-sys-color-on-surface);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
}

.stat-card-label {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 13px;
  font-weight: 500;
}

/* === Section === */
.section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-header {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.section-title {
  color: var(--md-sys-color-on-surface);
  font-size: 20px;
  font-weight: 500;
}

/* === Card Grid === */
.card-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* === Project Card === */
.project-card {
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  transition: box-shadow 0.2s, transform 0.15s;
}

.project-card:hover {
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
  transform: translateY(-2px);
}

.project-card-header {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.project-card-icon {
  color: var(--md-sys-color-primary);
  font-size: 28px;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 28;
}

.project-card-title {
  color: var(--md-sys-color-on-surface);
  font-size: 16px;
  font-weight: 500;
}

.project-card-desc {
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  color: var(--md-sys-color-on-surface-variant);
  display: -webkit-box;
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

.project-card-footer {
  align-items: center;
  color: var(--md-sys-color-on-surface-variant);
  display: flex;
  font-size: 12px;
  gap: 6px;
  margin-top: 4px;
}

.project-card-footer .material-symbols-outlined {
  font-size: 15px;
}

.project-card-date {
  margin-left: auto;
}

/* === Badges === */
.badge {
  border-radius: 50px;
  display: inline-flex;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.4px;
  padding: 3px 10px;
  text-transform: capitalize;
}

.badge--active {
  background-color: #D4EDDA;
  color: #155724;
}

[data-theme="dark"] .badge--active {
  background-color: #1A4731;
  color: #75D49B;
}

.badge--completed {
  background-color: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface-variant);
}

.badge--planning {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

/* === Buttons === */
.btn {
  align-items: center;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  display: inline-flex;
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  font-weight: 500;
  gap: 8px;
  letter-spacing: 0.1px;
  overflow: hidden;
  padding: 10px 24px;
  position: relative;
  text-decoration: none;
  transition: box-shadow 0.2s;
}

.btn .material-symbols-outlined {
  font-size: 18px;
}

.btn::before {
  content: '';
  inset: 0;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  transition: opacity 0.2s;
}

.btn:hover::before { opacity: 0.08; }
.btn:active::before { opacity: 0.12; }

.btn-filled {
  background-color: var(--md-sys-color-primary);
  box-shadow: var(--md-elevation-1);
  color: var(--md-sys-color-on-primary);
}

.btn-filled::before { background-color: var(--md-sys-color-on-primary); }
.btn-filled:hover { box-shadow: var(--md-elevation-2); color: var(--md-sys-color-on-primary); text-decoration: none; }

.btn-outlined {
  background-color: transparent;
  border: 1px solid var(--md-sys-color-outline);
  color: var(--md-sys-color-primary);
}

.btn-outlined::before { background-color: var(--md-sys-color-primary); }
.btn-outlined:hover { color: var(--md-sys-color-primary); text-decoration: none; }

.btn-text {
  background-color: transparent;
  color: var(--md-sys-color-primary);
  padding: 10px 12px;
}

.btn-text::before { background-color: var(--md-sys-color-primary); }
.btn-text:hover { color: var(--md-sys-color-primary); text-decoration: none; }

/* === Text Fields === */
.text-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.text-field-label {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 12px;
  font-weight: 500;
  padding-left: 4px;
}

.text-field-input {
  background-color: var(--md-sys-color-surface-container-highest);
  border: none;
  border-bottom: 1px solid var(--md-sys-color-outline);
  border-radius: 4px 4px 0 0;
  color: var(--md-sys-color-on-surface);
  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  height: 56px;
  outline: none;
  padding: 0 16px;
  transition: border-bottom-color 0.2s;
}

.text-field-input:focus {
  border-bottom: 2px solid var(--md-sys-color-primary);
}

.text-field-input::placeholder {
  color: var(--md-sys-color-on-surface-variant);
  opacity: 0.7;
}

/* === Breadcrumb === */
.breadcrumb {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  font-size: 13px;
  gap: 2px;
  margin-bottom: 8px;
}

.breadcrumb-item {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
}

.breadcrumb-item:hover {
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

.breadcrumb-sep {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 16px;
  opacity: 0.5;
}

.breadcrumb-current {
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
}

/* === Page Header === */
.page-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-title {
  color: var(--md-sys-color-on-surface);
  font-size: 28px;
  font-weight: 400;
}

.page-title-group {
  align-items: center;
  display: flex;
  gap: 12px;
}

.page-subtitle {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 14px;
}

/* === Actions Row === */
.actions-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}

/* === Detail Card === */
.detail-card {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  padding: 24px;
}

.detail-field label {
  color: var(--md-sys-color-on-surface-variant);
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.detail-field span {
  color: var(--md-sys-color-on-surface);
  font-size: 15px;
}

/* === Session List === */
.session-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.session-item {
  align-items: flex-start;
  background-color: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: 12px;
  color: var(--md-sys-color-on-surface);
  display: flex;
  gap: 16px;
  padding: 16px;
  text-decoration: none;
  transition: background-color 0.15s, box-shadow 0.15s;
}

.session-item:hover {
  background-color: var(--md-sys-color-surface-container-low);
  box-shadow: var(--md-elevation-1);
  color: var(--md-sys-color-on-surface);
  text-decoration: none;
}

.session-item-icon {
  align-items: center;
  background-color: var(--md-sys-color-secondary-container);
  border-radius: 50%;
  display: flex;
  flex-shrink: 0;
  height: 40px;
  justify-content: center;
  width: 40px;
}

.session-item-icon .material-symbols-outlined {
  color: var(--md-sys-color-on-secondary-container);
  font-size: 20px;
}

.session-item-content {
  flex: 1;
  min-width: 0;
}

.session-item-title {
  color: var(--md-sys-color-on-surface);
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.session-item-desc {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-item-meta {
  align-items: flex-end;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  gap: 6px;
}

.session-item-date {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 12px;
}

.session-item-duration {
  align-items: center;
  color: var(--md-sys-color-on-surface-variant);
  display: flex;
  font-size: 12px;
  gap: 3px;
}

.session-item-duration .material-symbols-outlined {
  font-size: 14px;
}

/* === Notes Card === */
.notes-card {
  padding: 20px;
}

.notes-label {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.8px;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.notes-text {
  color: var(--md-sys-color-on-surface);
  font-size: 15px;
  line-height: 1.6;
}

/* === Empty State === */
.empty-state {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
  justify-content: center;
  padding: 56px 24px;
  text-align: center;
}

/* === Error Message === */
.error-message {
  align-items: center;
  background-color: var(--md-sys-color-error-container);
  border-radius: 8px;
  color: var(--md-sys-color-on-error-container);
  display: flex;
  font-size: 14px;
  gap: 8px;
  padding: 12px 16px;
}

.error-message .material-symbols-outlined {
  flex-shrink: 0;
  font-size: 18px;
}

/* === Login Page === */
.login-page {
  align-items: center;
  background-color: var(--md-sys-color-background);
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  position: relative;
  transition: background-color 0.2s;
}

.login-card {
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: 28px;
  box-shadow: var(--md-elevation-3);
  max-width: 400px;
  padding: 40px 32px;
  width: 100%;
}

.login-header {
  margin-bottom: 32px;
  text-align: center;
}

.login-logo {
  align-items: center;
  background-color: var(--md-sys-color-primary-container);
  border-radius: 50%;
  display: flex;
  height: 56px;
  justify-content: center;
  margin: 0 auto 16px;
  width: 56px;
}

.login-logo .material-symbols-outlined {
  color: var(--md-sys-color-on-primary-container);
  font-size: 28px;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 28;
}

.login-title {
  color: var(--md-sys-color-on-surface);
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 6px;
}

.login-subtitle {
  color: var(--md-sys-color-on-surface-variant);
  font-size: 14px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.login-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.login-actions .btn {
  justify-content: center;
  width: 100%;
}

.login-theme-toggle {
  position: absolute;
  right: 16px;
  top: 16px;
}

/* === Responsive === */
@media (max-width: 900px) {
  .nav-drawer {
    transform: translateX(-100%);
  }

  .nav-drawer.open {
    transform: translateX(0);
  }

  .main-container {
    margin-left: 0;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .detail-card {
    grid-template-columns: 1fr;
  }

  .main-content {
    padding: 16px;
  }

  .page-title {
    font-size: 22px;
  }

  .session-item-meta {
    display: none;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}