/* =====================================================
   Travel Itinerary App - Main Stylesheet
   Premium Glassmorphism + Dark Theme
   ===================================================== */

:root {
    /* Color Palette */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(30, 30, 50, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.05);
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    
    --accent-blue: #4A90D9;
    --accent-purple: #8B5CF6;
    --accent-green: #10B981;
    --accent-orange: #F59E0B;
    --accent-pink: #EC4899;
    
    /* Category Colors */
    --cat-flight: #4A90D9;
    --cat-hotel: #8B5CF6;
    --cat-activity: #10B981;
    --cat-food: #F59E0B;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(74, 144, 217, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(236, 72, 153, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    animation: bgPulse 15s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% { opacity: 0.8; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.1); }
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.header-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-title h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.user-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-glass);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.nav-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
    background: var(--accent-purple);
    color: white;
    box-shadow: var(--shadow-glow);
}

/* =====================================================
   Card Components
   ===================================================== */

.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Trip Title Card */
.trip-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.trip-title {
    font-size: 2rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.trip-title input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 600;
    padding: var(--spacing-xs);
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-normal);
    width: auto;
    min-width: 200px;
}

.trip-title input:focus {
    outline: none;
    border-bottom-color: var(--accent-purple);
}

.budget-display {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 1.2rem;
    box-shadow: var(--shadow-glow);
}

/* =====================================================
   Timeline / Itinerary
   ===================================================== */

.timeline {
    position: relative;
}

.day-group {
    margin-bottom: var(--spacing-xl);
}

.day-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.day-badge {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.85rem;
}

.day-date {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Itinerary Item */
.itinerary-item {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: var(--spacing-md);
    align-items: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.itinerary-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    transition: background var(--transition-normal);
}

.itinerary-item[data-category="flight"]::before { background: var(--cat-flight); }
.itinerary-item[data-category="hotel"]::before { background: var(--cat-hotel); }
.itinerary-item[data-category="activity"]::before { background: var(--cat-activity); }
.itinerary-item[data-category="food"]::before { background: var(--cat-food); }

.itinerary-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.item-time {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 60px;
}

.item-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--bg-glass);
}

.item-content {
    flex: 1;
}

.item-title {
    font-weight: 500;
    margin-bottom: 2px;
}

.item-note {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.item-cost {
    font-weight: 600;
    color: var(--accent-green);
    font-size: 1rem;
    min-width: 100px;
    text-align: right;
}

.item-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.itinerary-item:hover .item-actions {
    opacity: 1;
}

.item-comments {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.item-comments:hover {
    color: var(--accent-blue);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: none;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--spacing-xs);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.3);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

/* FAB - Floating Action Button */
.fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: white;
    font-size: 1.5rem;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transition: all var(--transition-normal);
    z-index: 90;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

/* =====================================================
   Forms & Inputs
   ===================================================== */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0b0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* =====================================================
   Modal
   ===================================================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

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

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* =====================================================
   Login Screen
   ===================================================== */

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.login-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl) calc(var(--spacing-xl) * 1.5);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-logo {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.login-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.login-form {
    text-align: left;
}

.login-toggle {
    margin-top: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.login-toggle a {
    color: var(--accent-purple);
    text-decoration: none;
    cursor: pointer;
}

.login-toggle a:hover {
    text-decoration: underline;
}

/* =====================================================
   Memo Section (Notion-like)
   ===================================================== */

.memo-editor {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    min-height: 500px;
}

.memo-toolbar {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.memo-content {
    padding: var(--spacing-lg);
}

.memo-textarea {
    width: 100%;
    min-height: 400px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 0.95rem;
    line-height: 1.8;
    resize: vertical;
}

.memo-textarea:focus {
    outline: none;
}

.memo-status {
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

/* =====================================================
   Comments
   ===================================================== */

.comments-panel {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.comment {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.comment:last-child {
    border-bottom: none;
}

.comment-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.comment-content {
    flex: 1;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 4px;
}

.comment-author {
    font-weight: 500;
    font-size: 0.9rem;
}

.comment-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.comment-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.comment-input {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.comment-input .form-input {
    flex: 1;
}

/* =====================================================
   Budget Summary
   ===================================================== */

.budget-section {
    margin-top: var(--spacing-xl);
}

.budget-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.budget-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
}

.budget-card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.budget-card-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}

.budget-card-value {
    font-size: 1.5rem;
    font-weight: 600;
}

.budget-card[data-category="flight"] .budget-card-value { color: var(--cat-flight); }
.budget-card[data-category="hotel"] .budget-card-value { color: var(--cat-hotel); }
.budget-card[data-category="activity"] .budget-card-value { color: var(--cat-activity); }
.budget-card[data-category="food"] .budget-card-value { color: var(--cat-food); }

/* =====================================================
   Utilities
   ===================================================== */

.hidden { display: none !important; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.text-center { text-align: center; }
.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }

/* Loading Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--bg-glass);
    border-top-color: var(--accent-purple);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1100;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    margin-top: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .trip-title {
        font-size: 1.5rem;
    }
    
    .trip-title input {
        font-size: 1.5rem;
    }
    
    .itinerary-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .item-time {
        font-size: 0.9rem;
    }
    
    .item-cost {
        text-align: left;
    }
    
    .item-actions {
        opacity: 1;
    }
    
    .nav-tabs {
        overflow-x: auto;
    }
    
    .fab {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }
    
    .budget-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}