:root {
    --primary: #007bff;
    --primary-hover: #0056b3;
    --background: #f8f9fa;
    --card-bg: #ffffff;
    --text: #212529;
    --text-muted: #6c757d;
    --border: #dee2e6;
    --user-message-bg: #007bff;
    --user-message-text: #ffffff;
    --ai-message-bg: #f1f1f1;
    --ai-message-text: #212529;
    --animation-speed: 0.3s;
}

[data-theme="dark"] {
    --primary: #0d6efd;
    --primary-hover: #0a58ca;
    --background: #121212;
    --card-bg: #1e1e1e;
    --text: #e0e0e0;
    --text-muted: #adb5bd;
    --border: #343a40;
    --user-message-bg: #0d6efd;
    --user-message-text: #ffffff;
    --ai-message-bg: #2d2d2d;
    --ai-message-text: #e0e0e0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background);
    color: var(--text);
    transition: background-color var(--animation-speed), color var(--animation-speed);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Dynamic Background */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.cloud, .plane {
    position: absolute;
    opacity: 0.2;
    pointer-events: none;
}

.cloud {
    animation: float-cloud 60s linear infinite;
}

.plane {
    animation: fly-plane 40s linear infinite;
}

@keyframes float-cloud {
    0% {
        transform: translateX(-100px);
    }
    100% {
        transform: translateX(calc(100vw + 100px));
    }
}

@keyframes fly-plane {
    0% {
        transform: translateX(-100px) translateY(0);
    }
    50% {
        transform: translateX(calc(50vw)) translateY(-50px);
    }
    100% {
        transform: translateX(calc(100vw + 100px)) translateY(0);
    }
}

.navbar {
    background-color: var(--primary) !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color var(--animation-speed);
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-weight: bold;
    color: white !important;
}

.theme-toggle {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.card {
    background-color: var(--card-bg);
    border-color: var(--border);
    transition: background-color var(--animation-speed), border-color var(--animation-speed), transform 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.nav-tabs {
    border-color: var(--border);
}

.nav-tabs .nav-link {
    color: var(--text);
    transition: color var(--animation-speed);
}

.nav-tabs .nav-link.active {
    color: var(--primary);
    background-color: var(--card-bg);
    border-color: var(--border) var(--border) var(--card-bg);
}

.chat-container {
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    height: 70vh;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    scroll-behavior: smooth;
}

.message-content {
    white-space: pre-wrap;
    padding: 0.75rem;
    border-radius: 1rem;
}

.message-row {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    width: 100%;
    animation: fade-in 0.3s ease-out;
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message {
    margin-bottom: 1rem;
    max-width: 80%;
    border-radius: 1rem;
    transition: background-color var(--animation-speed), color var(--animation-speed);
}

.user-message {
    margin-left: auto;
    background-color: var(--user-message-bg);
    color: var(--user-message-text);
    animation: slide-left 0.3s ease-out;
}

.ai-message {
    margin-right: auto;
    background-color: var(--ai-message-bg);
    color: var(--ai-message-text);
    animation: slide-right 0.3s ease-out;
}

@keyframes slide-right {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-left {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    flex-shrink: 0;
    transition: background-color var(--animation-speed);
}

.user-avatar {
    background-color: var(--user-message-bg);
    color: var(--user-message-text);
    margin-left: 10px;
    margin-right: 0;
}

.ai-avatar {
    background-color: var(--ai-message-bg);
    color: var(--primary);
}

.chat-input {
    padding: 1rem;
    border-top: 1px solid var(--border);
    background-color: var(--card-bg);
    transition: background-color var(--animation-speed), border-color var(--animation-speed);
}

.form-control {
    background-color: var(--card-bg);
    color: var(--text);
    border-color: var(--border);
    transition: background-color var(--animation-speed), color var(--animation-speed), border-color var(--animation-speed);
}

.form-control:focus {
    background-color: var(--card-bg);
    color: var(--text);
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
}

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

.btn-primary:active {
    transform: scale(0.95);
}

.tab-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 0.5rem 0.5rem;
    padding: 1rem;
    transition: background-color var(--animation-speed), border-color var(--animation-speed);
}

.day-card {
    transition: transform 0.2s, background-color var(--animation-speed), border-color var(--animation-speed);
    background-color: var(--card-bg);
    border-color: var(--border);
    margin-bottom: 1.5rem;
}

.day-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--animation-speed), border-color var(--animation-speed);
}

[data-theme="dark"] .card-header {
    background-color: rgba(255, 255, 255, 0.05);
}

.activity {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    margin-bottom: 1rem;
    transition: border-left-color 0.3s;
}

.activity:hover {
    border-left-color: var(--primary-hover);
}

.btn-outline-primary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    border-color: var(--primary);
    transition: color 0.2s, background-color 0.2s, border-color 0.2s, transform 0.1s;
}

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

.btn-outline-primary:active {
    transform: scale(0.95);
}

.itinerary-header {
    background-color: rgba(0, 123, 255, 0.05);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    transition: background-color var(--animation-speed);
}

[data-theme="dark"] .itinerary-header {
    background-color: rgba(13, 110, 253, 0.1);
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 123, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

.preferences .badge {
    background-color: rgba(0, 123, 255, 0.1);
    color: var(--primary);
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    transition: background-color var(--animation-speed), color var(--animation-speed);
    animation: badge-pop 0.3s ease-out;
}

@keyframes badge-pop {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .message {
        max-width: 90%;
    }
}