:root {
    /* Color Palette */
    --color-navy: #0D1B2A;
    --color-ocean: #1B4F8A;
    --color-sky: #4A9EDE;
    --color-aqua: #00C9B1;
    --color-accent: #FF7043;
    --color-surface: #F0F7FF;
    --color-white: #FFFFFF;
    --color-dark-surface: #1A2C42;
    --color-gray: #64748B;
    --color-light-gray: #E2E8F0;
    
    /* Typography */
    --font-display: 800 32px/1.2 'Inter', sans-serif;
    --font-heading: 700 20px/1.3 'Inter', sans-serif;
    --font-body: 400 15px/1.5 'Inter', sans-serif;
    --font-hero: 300 64px/1.1 'Inter', sans-serif;
    --font-mono: 400 12px/1.5 'JetBrains Mono', monospace;

    /* Theme variables - set to Light by default */
    --bg-color: #FAFCFF;
    --text-color: #0F172A;
    --nav-bg: var(--color-navy);
    --nav-text: var(--color-white);
    --card-bg: var(--color-surface);
    --card-border: var(--color-light-gray);
    --hover-bg: #E0EFFF;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 13, 30, 0.1);
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: var(--color-navy);
    --text-color: #F8FAFC;
    --nav-bg: #08101A;
    --card-bg: var(--color-dark-surface);
    --card-border: #2A3F54;
    --hover-bg: #233A54;
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --color-surface: var(--color-dark-surface); /* For fallback */
}

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

body {
    font: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

h1, h2, h3 { font-family: 'Inter', sans-serif; }
a { color: var(--color-sky); text-decoration: none; }
button { cursor: pointer; font-family: 'Inter', sans-serif; border: none; background: none; }

/* Navbar */
.navbar {
    background-color: var(--nav-bg);
    color: var(--nav-text);
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap; /* responsive */
}

.nav-logo {
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-aqua);
}

.nav-search {
    flex-grow: 1;
    max-width: 500px;
    display: flex;
    position: relative;
}

.nav-search input {
    width: 100%;
    padding: 0.75rem 1rem;
    padding-right: 3rem;
    border-radius: 2rem;
    border: none;
    outline: none;
    font: var(--font-body);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    transition: background 0.3s, box-shadow 0.3s;
}

.nav-search input:focus {
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 0 2px var(--color-sky);
}
.nav-search input::placeholder { color: rgba(255,255,255,0.7); }

.nav-search button {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-white);
    background: var(--color-sky);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.nav-search button:hover { background: var(--color-aqua); }

.nav-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.icon-btn {
    color: var(--color-white);
    font-size: 1.1rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.2s, color 0.2s;
    font-weight: 600;
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.1); color: var(--color-aqua); }

/* Main Content Wrapper */
.main-content {
    flex: 1;
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

/* Hero Section */
.hero-section {
    position: relative;
    border-radius: 1.5rem;
    overflow: hidden;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    background-color: var(--nav-bg); /* Fallback */
}

.hero-background {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-size: cover;
    background-position: center;
    background-image: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?auto=format&fit=crop&q=80&w=1600&h=900'); /* Default Beach */
    transition: background-image 0.5s ease-in-out;
}

.hero-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom right, rgba(13, 27, 42, 0.7), rgba(13, 27, 42, 0.3));
}

.weather-card.glass-panel {
    position: relative;
    z-index: 10;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    padding: 2.5rem;
    color: var(--color-white);
    max-width: 600px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-glass);
}

.weather-header h1 { font: var(--font-display); margin-bottom: 0.25rem; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }
.weather-header p { font-size: 1.1rem; opacity: 0.9; }

.weather-main {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin: 2rem 0;
}

.weather-icon-large { font-size: 4rem; text-shadow: 0 2px 10px rgba(0,0,0,0.2); }
.temp-group { display: flex; align-items: flex-start; }
.temperature { font: var(--font-hero); text-shadow: 0 2px 4px rgba(0,0,0,0.3); line-height: 1; }
.unit-label { font-size: 1.5rem; font-weight: 700; margin-top: 0.5rem; }

.condition { font: var(--font-heading); margin-bottom: 1.5rem; text-transform: capitalize; }

.weather-chips {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.chip {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes pulseWeather {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}
.pulse-anim { animation: pulseWeather 3s infinite ease-in-out; }

@keyframes fadeInMove {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInMove 0.6s ease forwards; }

@keyframes slideInRight {
    0% { transform: translateX(100%); }
    100% { transform: translateX(0); }
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger {
    padding: 0.6rem 1.2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.btn-primary { background: var(--color-sky); color: white; }
.btn-primary:hover { background: var(--color-aqua); transform: translateY(-2px); box-shadow: 0 4px 10px rgba(0,201,177,0.3); }
.btn-secondary { background: var(--card-bg); color: var(--text-color); border: 1px solid var(--card-border); }
.btn-secondary:hover { background: var(--hover-bg); border-color: var(--color-sky); }
.btn-danger { background: #fee2e2; color: #dc2626; }
.btn-danger:hover { background: #fecaca; }

/* Itinerary Area */
.itinerary-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    border-bottom: 2px solid var(--card-border);
    padding-bottom: 1rem;
}
.itinerary-actions h2 { font: var(--font-heading); color: var(--color-ocean); display: flex; align-items: center; gap: 0.5rem; }
body.dark-mode .itinerary-actions h2 { color: var(--color-aqua); }

.action-buttons { display: flex; gap: 1rem; }

.itinerary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.itinerary-card {
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 1px solid var(--card-border);
    transition: transform 0.3s, box-shadow 0.3s;
}
.itinerary-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 1rem 1.5rem;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.morning-header { background: linear-gradient(135deg, #F59E0B, #D97706); }
.afternoon-header { background: linear-gradient(135deg, #3B82F6, #2563EB); }
.evening-header { background: linear-gradient(135deg, #4F46E5, #3730A3); }

.time-title h3 { margin: 0; font-size: 1.2rem; display: flex; align-items: center; gap: 0.4rem; }
.time-range { font-size: 0.8rem; opacity: 0.9; }

.weather-mini {
    font-weight: 700;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.activity-list { list-style: none; padding: 1.5rem; }
.activity-item {
    padding: 1rem;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}
.activity-item:last-child { border-bottom: none; }

.activity-icon { font-size: 1.5rem; width: 32px; text-align: center; }
.activity-details h4 { margin-bottom: 0.25rem; font-weight: 700; }
.activity-details p { font-size: 0.9rem; color: var(--color-gray); margin-bottom: 0.5rem; }

.activity-tags { display: flex; gap: 0.5rem; }
.tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 1rem;
    font-weight: 600;
}
.tag-outdoor { background: #dcfce7; color: #166534; }
.tag-indoor { background: #f3e8ff; color: #6b21a8; }
body.dark-mode .tag-outdoor { background: rgba(22, 101, 52, 0.3); color: #4ade80; }
body.dark-mode .tag-indoor { background: rgba(107, 33, 168, 0.3); color: #d8b4fe; }

.empty-state {
    text-align: center;
    color: var(--color-gray);
    padding: 2rem 0;
    font-style: italic;
}

/* Map Section */
.map-section h2 { font: var(--font-heading); color: var(--color-ocean); margin-bottom: 1rem;}
body.dark-mode .map-section h2 { color: var(--color-aqua); }
.map-container {
    height: 420px;
    width: 100%;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
    z-index: 1; /* Keep map below navbar */
}

/* History Drawer */
.history-drawer {
    position: fixed;
    top: 0;
    right: -350px;
    width: 350px;
    height: 100vh;
    background: var(--card-bg);
    box-shadow: -5px 0 25px rgba(0,0,0,0.1);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
}
.history-drawer.open { right: 0; }

.drawer-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.drawer-header h2 { font: var(--font-heading); }

.drawer-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}
.history-list { list-style: none; }
.history-item {
    padding: 1rem;
    background: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: border-color 0.2s;
}
.history-item:hover { border-color: var(--color-sky); }
.history-info strong { display: block; font-size: 1.1rem; }
.history-info span { font-size: 0.85rem; color: var(--color-gray); }

.del-btn { color: #ef4444; padding: 0.5rem; transition: background 0.2s; border-radius: 0.25rem;}
.del-btn:hover { background: #fee2e2; }

.drawer-footer {
    padding: 1rem;
    border-top: 1px solid var(--card-border);
}
.drawer-footer button { width: 100%; justify-content: center; }

/* Overlay */
.overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 1500;
    display: none;
    opacity: 0;
    transition: opacity 0.3s;
}
.overlay.show { display: block; opacity: 1; }

/* Skeleton Loaders */
.skeleton {
    background: linear-gradient(90deg, rgba(255,255,255,0.1) 25%, rgba(255,255,255,0.2) 50%, rgba(255,255,255,0.1) 75%);
    background-size: 200% 100%;
    animation: skeletonLoading 1.5s infinite;
    border-radius: 4px;
    margin: 1rem auto;
}
.skeleton-text { width: 60%; height: 2rem; }
.skeleton-text-short { width: 40%; height: 1rem; }
.skeleton-box { width: 100%; max-width: 400px; height: 6rem; border-radius: 1rem; }

@keyframes skeletonLoading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Error Card */
.error-card { margin-top: 2rem; }
.error-card i { font-size: 2rem; color: var(--color-accent); margin-bottom: 1rem; }
.error-card .btn-primary { margin-top: 1rem; }

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: var(--nav-bg);
    color: rgba(255,255,255,0.7);
    font: var(--font-mono);
    margin-top: auto;
}

/* --- New Components (Autocomplete, Tabs, Modal, Sidebar) --- */

/* Autocomplete Suggestions */
.search-wrapper { position: relative; width: 100%; }
.suggestions-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    margin-top: 0.5rem;
    max-height: 250px;
    overflow-y: auto;
    list-style: none;
    box-shadow: var(--shadow-md);
    z-index: 2000;
}
.suggestions-list li {
    padding: 0.75rem 1rem;
    cursor: pointer;
    color: var(--text-color);
    border-bottom: 1px solid var(--card-border);
    transition: background 0.2s;
}
.suggestions-list li:last-child { border-bottom: none; }
.suggestions-list li:hover { background: var(--hover-bg); color: var(--color-sky); }

/* Day Tabs */
.day-tabs {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    width: 100%;
}
.day-tab {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 2rem;
    color: var(--text-color);
    font-weight: 600;
    white-space: nowrap;
    transition: all 0.2s;
}
.day-tab.active { background: var(--color-sky); color: white; border-color: var(--color-sky); }
.day-tab:hover:not(.active) { background: var(--hover-bg); }

/* Popular Drawer (Left) */
.popular-drawer {
    position: fixed;
    top: 0;
    left: -350px;
    width: 350px;
    height: 100vh;
    background: var(--card-bg);
    box-shadow: 5px 0 25px rgba(0,0,0,0.1);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    transition: left 0.3s ease;
}
.popular-drawer.open { left: 0; }
.popular-drawer .drawer-header i { color: var(--color-aqua); }

/* Modal Overlay & Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal {
    background: var(--card-bg);
    color: var(--text-color);
    width: 90%;
    max-width: 450px;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}
.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
    background: var(--nav-bg);
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-body { padding: 1.5rem; }
.modal-body p { margin-bottom: 1rem; color: var(--color-gray); }

/* Utility */
.w-100 { width: 100%; }
.itinerary-title-export {
    text-align: center;
    padding: 2rem 0;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-color);
}

/* Responsive constraints */
@media (max-width: 768px) {
    .nav-logo span { display: none; }
    .hero-section { border-radius: 0; }
    .temperature { font-size: 48px; }
    .day-tabs { flex-wrap: nowrap; }
}
@media (max-width: 320px) {
    .action-buttons { flex-direction: column; width: 100%; }
    .action-buttons button { width: 100%; justify-content: center; }
}