/**
 * TripTally - Main Styles
 * Dark mode, mobile-first design
 */

/* ========================================
   CSS Variables - Dark Mode Theme
   ======================================== */
:root {
    /* Colors */
    --color-background: #1a1a1a;
    --color-surface: #2d2d2d;
    --color-surface-light: #3a3a3a;
    --color-surface-hover: #404040;
    --color-primary: #4a9eff;
    --color-primary-dark: #3a7ed9;
    --color-success: #4caf50;
    --color-warning: #e09030;
    --color-error: #f44336;
    --color-info: #2196f3;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-text-disabled: #6b6b6b;
    --color-border: #404040;
    --color-border-light: #353535;

    /* Purpose colors */
    --color-business: #4caf50;
    --color-medical: #2196f3;
    --color-charitable: #00bcd4;
    --color-moving: #9c27b0;
    --color-personal: #607d8b;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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: 32px;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-index */
    --z-base: 1;
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-toast: 3000;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin: 0 0 var(--spacing-md) 0;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

/* ========================================
   Layout
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.screen {
    min-height: 100vh;
}

#main-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ========================================
   Loading Screen
   ======================================== */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--color-background);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--color-surface);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

/* ========================================
   Impersonation Banner
   ======================================== */
.impersonation-banner {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.impersonation-banner .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#impersonation-text {
    font-weight: 500;
}

/* ========================================
   Header
   ======================================== */
.app-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 99;
}

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

.header-left {
    display: flex;
    align-items: center;
}

.app-title {
    font-size: var(--font-size-xl);
    margin: 0;
}

.header-right {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* User Menu Dropdown */
.user-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    overflow: hidden;
}

.user-menu-header {
    padding: var(--spacing-md);
    background-color: var(--color-surface-light);
    border-bottom: 1px solid var(--color-border);
}

.user-menu-name {
    font-weight: 600;
    color: var(--color-text-primary);
    display: block;
}

.user-menu-divider {
    height: 1px;
    background-color: var(--color-border);
}

.user-menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.user-menu-item:hover {
    background-color: var(--color-surface-hover);
}

.user-menu-item .menu-icon {
    font-size: var(--font-size-lg);
    width: 24px;
    display: inline-block;
    text-align: center;
}

/* ========================================
   Navigation
   ======================================== */
.app-nav {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 60px;
    z-index: 98;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.app-nav .container {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-btn:hover {
    background-color: var(--color-surface-hover);
    color: var(--color-text-primary);
}

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

/* ========================================
   Content
   ======================================== */
.app-content {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

.view {
    display: none;
}

.view.active {
    display: block;
}

.view-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.view-header h2 {
    margin: 0;
}

.view-controls {
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Floating Action Button (FAB)
   ======================================== */
.fab {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    border: none;
    font-size: 28px;
    font-weight: 300;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.6);
}

.fab:active {
    transform: scale(0.95);
}

/* ========================================
   Empty States
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-secondary);
}

.empty-state p {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
}

/* ========================================
   Message Boxes
   ======================================== */
.error-message,
.warning-message,
.info-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.error-message {
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid var(--color-error);
    color: var(--color-error);
}

.warning-message {
    background-color: rgba(255, 152, 0, 0.1);
    border: 1px solid var(--color-warning);
    color: var(--color-warning);
}

.info-message {
    background-color: rgba(33, 150, 243, 0.1);
    border: 1px solid var(--color-info);
    color: var(--color-info);
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-secondary {
    color: var(--color-text-secondary);
}

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

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }