/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette - Nature Inspired */
  --primary-color: #2c5530;
  --primary-light: #4a7c59;
  --primary-dark: #1a3d1f;
  --secondary-color: #8ba892;
  --accent-color: #d4e6d9;
  
  /* Neutral Colors */
  --white: #ffffff;
  --light-gray: #f8f9fa;
  --gray: #6c757d;
  --dark-gray: #343a40;
  --black: #212529;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  
  /* Text Colors */
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  
  /* Status Colors */
  --success: #28a745;
  --warning: #ffc107;
  --error: #dc3545;
  --info: #17a2b8;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity var(--transition-base);
}

.loading-content {
  text-align: center;
  color: var(--primary-color);
}

.loading-content h2 {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  letter-spacing: -0.5px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--accent-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: var(--spacing-lg) auto 0;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

/* Header */
.app-header {
  background: var(--white);
  border-bottom: 1px solid var(--bg-tertiary);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary-color);
  letter-spacing: -0.5px;
}

/* Bottom Tab Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--white);
  border-top: 1px solid var(--bg-tertiary);
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.tab-bar {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 60px;
  max-width: 100%;
}

.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 100%;
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--transition-base);
  min-width: 0;
  padding: var(--spacing-xs);
}

.tab-item:hover,
.tab-item.active {
  color: var(--primary-color);
}

.tab-item.active .tab-icon {
  background-color: var(--accent-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs);
}

.tab-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-bottom: var(--spacing-xs);
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
}

.tab-icon svg {
  width: 24px;
  height: 24px;
  transition: var(--transition-base);
}

.tab-item.active .tab-icon svg {
  transform: scale(1.1);
}

.tab-label {
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-align: center;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--spacing-lg);
  padding-bottom: calc(60px + var(--spacing-lg) + env(safe-area-inset-bottom));
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
}

/* Weather Section */
.weather-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.current-weather {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-lg);
}

.location-info h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.location-info p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.weather-main {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.weather-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.weather-details h3 {
  font-size: var(--font-size-3xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.weather-details p {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.weather-forecast h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.forecast-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
}

.forecast-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
  transition: var(--transition-base);
}

.forecast-item:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.forecast-time {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.forecast-icon {
  font-size: 24px;
  margin-bottom: var(--spacing-xs);
}

.forecast-temp {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

/* Locations Section */
.locations-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.locations-container h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.locations-list {
  margin-bottom: var(--spacing-lg);
}

.location-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  transition: var(--transition-base);
}

.location-item:hover {
  background: var(--bg-tertiary);
}

.location-info h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.location-info p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.location-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* Diary Section */
.diary-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.diary-container h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.diary-form {
  margin-bottom: var(--spacing-xl);
}

.diary-form textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  resize: vertical;
  transition: var(--transition-base);
}

.diary-form textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(44, 85, 48, 0.1);
}

.diary-history h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.diary-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.diary-entry {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
}

.diary-date {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.diary-content {
  color: var(--text-primary);
  line-height: 1.6;
}

/* Profile Section */
.profile-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.profile-container h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.profile-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.profile-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.profile-details h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.profile-details p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.profile-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

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

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--gray);
  color: var(--white);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--bg-tertiary);
}

.modal-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
}

.modal-close:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-group input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: var(--transition-base);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(44, 85, 48, 0.1);
}

.auth-switch {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--bg-tertiary);
}

.auth-switch a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.auth-switch a:hover {
  text-decoration: underline;
}

/* Mobile-First Design - Fixed Mobile Layout */
.current-weather {
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.weather-main {
  flex-direction: column;
  text-align: center;
}

.forecast-grid {
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.profile-info {
  flex-direction: column;
  text-align: center;
}

.profile-actions {
  flex-direction: column;
  gap: var(--spacing-md);
}

.main-content {
  padding: var(--spacing-md);
}

.weather-container,
.locations-container,
.diary-container,
.profile-container {
  padding: var(--spacing-lg);
}

.modal-content {
  width: 95%;
  margin: var(--spacing-md);
  max-width: 400px;
}

/* Mobile-specific optimizations */
.app-header {
  padding: var(--spacing-sm) var(--spacing-md);
}

.header-content {
  max-width: 100%;
  padding: 0 var(--spacing-sm);
}

.app-title {
  font-size: var(--font-size-lg);
}

.weather-icon {
  width: 80px;
  height: 80px;
}

.forecast-item {
  padding: var(--spacing-sm);
  text-align: center;
}

.forecast-time {
  font-size: var(--font-size-xs);
}

.forecast-temp {
  font-size: var(--font-size-sm);
}

.location-item {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.diary-form textarea {
  min-height: 120px;
  font-size: var(--font-size-sm);
}

.diary-entry {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.profile-avatar {
  width: 80px;
  height: 80px;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 44px;
  touch-action: manipulation;
}

.form-group input {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 44px;
}

/* Touch-friendly interactions */
.btn:active,
.tab-item:active,
.modal-close:active {
  transform: scale(0.98);
}

/* Prevent zoom on input focus */
input, textarea, select {
  font-size: 16px;
}

/* Safe area support for notched devices */
@supports (padding: max(0px)) {
  .app-header {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
  }
  
  .main-content {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
  }
}

/* 가로형 날씨 차트 스타일 */
.weather-chart-box {
    overflow-x: auto;
    background: #fafbfc;
    border-radius: 12px;
    padding: 16px 0;
    margin-bottom: 24px;
}
.weather-chart-scroll {
    display: flex;
    flex-direction: row;
    gap: 24px;
    min-width: 600px;
    scroll-snap-type: x mandatory;
    overflow-x: auto;
}
.weather-chart-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
    scroll-snap-align: center;
}
.chart-time {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 4px;
}
.chart-icon {
    font-size: 1.5rem;
    margin-bottom: 2px;
}
.chart-temp {
    font-weight: bold;
    font-size: 1.1rem;
}