/* ============================================
   VELORA - Material Design 3 Mobile-First
   ============================================ */

:root {
    /* Material Design 3 Color System */
    --md-primary: #6200EE;
    --md-on-primary: #FFFFFF;
    --md-primary-container: #EADDFF;
    --md-on-primary-container: #21005E;

    --md-secondary: #03DAC6;
    --md-on-secondary: #000000;
    --md-secondary-container: #B2F5EA;
    --md-on-secondary-container: #00201A;

    --md-tertiary: #FF6D00;
    --md-on-tertiary: #FFFFFF;
    --md-tertiary-container: #FFD8B9;
    --md-on-tertiary-container: #330B00;

    --md-error: #F2B8B5;
    --md-on-error: #5F1F1A;
    --md-error-container: #F9DEDC;

    --md-background: #FFFBFE;
    --md-on-background: #1C1B1F;
    --md-surface: #FFFBFE;
    --md-on-surface: #1C1B1F;
    --md-surface-variant: #E7E0EC;
    --md-on-surface-variant: #49454E;

    --md-outline: #79747E;
    --md-outline-variant: #CAC4D0;
    --md-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05);

    /* Elevation shadows */
    --md-elevation-1: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 1px 2px 0 rgba(0, 0, 0, 0.24);
    --md-elevation-2: 0 3px 6px 0 rgba(0, 0, 0, 0.16), 0 3px 6px 0 rgba(0, 0, 0, 0.23);
    --md-elevation-3: 0 10px 20px 0 rgba(0, 0, 0, 0.19), 0 6px 6px 0 rgba(0, 0, 0, 0.23);
    --md-elevation-4: 0 15px 25px 0 rgba(0, 0, 0, 0.15), 0 10px 10px 0 rgba(0, 0, 0, 0.05);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--md-background);
    color: var(--md-on-background);
    transition: var(--transition);
    padding-bottom: 80px;
    margin: 0;
}

body[data-bs-theme="dark"] {
    --md-background: #1C1B1F;
    --md-on-background: #E6E1E6;
    --md-surface: #1C1B1F;
    --md-on-surface: #E6E1E6;
    --md-surface-variant: #49454E;
    --md-on-surface-variant: #CAC4D0;
    background-color: var(--md-background);
    color: var(--md-on-background);
}

/* ============================================
   TOP APP BAR / NAVBAR
   ============================================ */

.navbar {
    background-color: var(--md-primary) !important;
    color: var(--md-on-primary) !important;
    box-shadow: var(--md-elevation-1);
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0;
    transition: var(--transition);
    color: var(--md-on-primary) !important;
}

.navbar-brand:hover {
    opacity: 0.8;
}

.nav-link {
    margin: 0;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--md-on-primary) !important;
    opacity: 0.9;
}

.nav-link:hover,
.nav-link.active {
    opacity: 1;
}

/* ============================================
   MAIN CONTAINER
   ============================================ */

main {
    min-height: calc(100vh - 150px);
}

/* ============================================
   SECTION STYLES
   ============================================ */

.section-content {
    animation: fadeIn 0.3s ease;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--md-on-background);
}

h1.display-5 {
    color: var(--md-primary);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

/* ============================================
   CARDS & STAT CARDS (Material Design 3)
   ============================================ */

.card {
    border-radius: 12px;
    transition: var(--transition);
    background: var(--md-surface);
    border: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
}

.card:hover {
    box-shadow: var(--md-elevation-2);
}

.card-header {
    background-color: var(--md-surface-variant) !important;
    border-color: var(--md-outline-variant) !important;
}

.stat-card {
    border-radius: 12px;
    background: var(--md-surface);
    transition: var(--transition);
    border: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
    padding: 1.25rem;
}

.stat-card:hover {
    box-shadow: var(--md-elevation-2);
}

.stat-card h3 {
    color: var(--md-primary);
    font-weight: 600;
    font-size: 1.75rem;
}

.stat-icon {
    font-size: 1.75rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--md-primary-container);
    color: var(--md-primary);
    border-radius: 12px;
}

/* ============================================
   BUTTONS (Material Design 3)
   ============================================ */

.btn {
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.9rem;
    padding: 0.75rem 1.5rem;
    border: none;
}

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

.btn-primary:hover {
    background-color: #7c3ff2;
    box-shadow: var(--md-elevation-2);
}

.btn-primary:active {
    background-color: #5a189a;
}

.btn-primary:disabled {
    opacity: 0.38;
}

.btn-success {
    background-color: var(--md-secondary);
    color: var(--md-on-secondary);
}

.btn-success:hover {
    background-color: #01c9b3;
    box-shadow: var(--md-elevation-2);
}

.btn-danger {
    background-color: #B3261E;
    color: #F9DEDC;
}

.btn-danger:hover {
    background-color: #F2B8B5;
}

.btn-outline-primary {
    border: 1px solid var(--md-primary);
    color: var(--md-primary);
    background-color: transparent;
}

.btn-outline-primary:hover {
    background-color: rgba(98, 0, 238, 0.08);
}

/* ============================================
   FORMS (Material Design 3)
   ============================================ */

.form-control,
.form-select {
    border-radius: 8px;
    border: 1px solid var(--md-outline);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    font-size: 0.95rem;
    background-color: var(--md-surface);
    color: var(--md-on-surface);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--md-primary);
    box-shadow: 0 0 0 3px rgba(98, 0, 238, 0.1);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--md-on-surface);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* ============================================
   MODALS (Material Design 3)
   ============================================ */

.modal-content {
    border-radius: 28px;
    background-color: var(--md-surface);
    box-shadow: var(--md-elevation-4);
    border: none;
}

.modal-header {
    background-color: var(--md-surface);
    color: var(--md-on-surface);
    border-bottom: 1px solid var(--md-outline-variant);
    padding: 1.5rem;
}

.modal-header h5 {
    color: var(--md-on-surface);
    font-weight: 600;
    font-size: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--md-outline-variant);
    background-color: var(--md-surface);
    padding: 1rem 1.5rem;
}

/* ============================================
   TABS & NAVIGATION
   ============================================ */

.nav-tabs {
    border-bottom: 2px solid #ddd;
    gap: 10px;
}

body[data-bs-theme="dark"] .nav-tabs {
    border-bottom-color: #555;
}

.nav-tabs .nav-link {
    color: #555;
    border: none;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
}

body[data-bs-theme="dark"] .nav-tabs .nav-link {
    color: #bbb;
}

.nav-tabs .nav-link:hover {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

.nav-tabs .nav-link.active {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
    background: none;
}

/* ============================================
   TRIP CARDS (Material Design 3 CardView)
   ============================================ */

.trip-card {
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    background: var(--md-surface);
    border: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
}

.trip-card:hover {
    box-shadow: var(--md-elevation-3);
    transform: translateY(-4px);
}

.trip-card-header {
    background: linear-gradient(135deg, var(--md-primary), #7c3ff2);
    color: var(--md-on-primary);
    padding: 1.25rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.trip-card-body {
    padding: 1.25rem;
}

.trip-badge {
    display: inline-block;
    background: #ecf0f1;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    color: #555;
}

body[data-bs-theme="dark"] .trip-badge {
    background: #444;
    color: #bbb;
}

/* ============================================
   TIMELINE
   ============================================ */

.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--secondary-color), #3498db);
    margin-left: 15px;
}

.timeline-item {
    margin-left: 60px;
    margin-bottom: 30px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -55px;
    top: 8px;
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid var(--secondary-color);
    border-radius: 50%;
    transition: var(--transition);
}

.timeline-item:hover::before {
    transform: scale(1.3);
    background: var(--secondary-color);
}

.timeline-content {
    background: white;
    padding: 1.25rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

body[data-bs-theme="dark"] .timeline-content {
    background: #2a2a2a;
}

.timeline-content:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.timeline-date {
    font-weight: 700;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* ============================================
   CHAT HISTORY
   ============================================ */

.chat-history {
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #f8f9fa;
    padding: 1rem;
}

body[data-bs-theme="dark"] .chat-history {
    background-color: #1a1a1a;
    border-color: #555;
}

.chat-message {
    margin-bottom: 1rem;
    animation: slideIn 0.3s ease;
}

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

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

.message-content {
    display: inline-block;
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    word-wrap: break-word;
}

.message-user .message-content {
    background: var(--secondary-color);
    color: white;
}

.message-ai .message-content {
    background: #ecf0f1;
    color: #333;
}

body[data-bs-theme="dark"] .message-ai .message-content {
    background: #333;
    color: #e0e0e0;
}

/* ============================================
   TRANSLATOR
   ============================================ */

.translator-container {
    gap: 1rem;
}

.language-selector {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.language-selector select {
    flex: 1;
}

/* ============================================
   ALERTS & NOTIFICATIONS (Material Design 3)
   ============================================ */

.alert {
    border-radius: 12px;
    border: none;
    animation: slideDown 0.3s ease;
    padding: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

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

.alert-info {
    background-color: #e3f2fd;
    color: #01579b;
}

body[data-bs-theme="dark"] .alert-info {
    background-color: #1a237e;
    color: #bbdefb;
}

.alert-success {
    background-color: #e8f5e9;
    color: #1b5e20;
}

body[data-bs-theme="dark"] .alert-success {
    background-color: #1b5e20;
    color: #c8e6c9;
}

.alert-warning {
    background-color: #fff3e0;
    color: #e65100;
}

body[data-bs-theme="dark"] .alert-warning {
    background-color: #e65100;
    color: #ffe0b2;
}

.alert-danger {
    background-color: #ffebee;
    color: #b71c1c;
}

body[data-bs-theme="dark"] .alert-danger {
    background-color: #b71c1c;
    color: #ffcdd2;
}

/* ============================================
   LIST GROUPS (Material Design 3)
   ============================================ */

.list-group {
    gap: 0.25rem;
}

.list-group-item {
    border-radius: 8px;
    border: none;
    transition: var(--transition);
    background-color: var(--md-surface);
    color: var(--md-on-surface);
    padding: 1rem;
    box-shadow: var(--md-elevation-1);
    margin-bottom: 0.5rem;
}

.list-group-item:hover {
    background-color: rgba(98, 0, 238, 0.08);
    box-shadow: var(--md-elevation-2);
}

.list-group-item.active {
    background-color: var(--md-primary);
    color: var(--md-on-primary);
}

.list-group-item i {
    margin-right: 0.75rem;
    font-size: 1.25rem;
}

/* ============================================
   BADGES & LABELS
   ============================================ */

.badge {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-weight: 600;
}

.expense-category-badge {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 0.5rem;
}

.category-transport { background: #e8f4f8; color: #0277bd; }
.category-hotel { background: #fff3e0; color: #e65100; }
.category-food { background: #f3e5f5; color: #7b1fa2; }
.category-entertainment { background: #e0f2f1; color: #00695c; }
.category-other { background: #f1f8e9; color: #558b2f; }

body[data-bs-theme="dark"] .expense-category-badge {
    opacity: 0.8;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    background: var(--primary-color);
    margin-top: 4rem;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

footer p {
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

/* ============================================
   VOICE STATUS
   ============================================ */

.voice-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #27ae60;
    animation: pulse 1s infinite;
    margin-right: 0.5rem;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

/* ============================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ============================================ */

@media (max-width: 768px) {
    .navbar {
        padding: 0.6rem 0.75rem;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

    h1.display-5 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }

    .stat-card {
        margin-bottom: 1rem;
        padding: 1rem;
    }

    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }

    .trip-card-body {
        padding: 1rem;
    }

    .modal {
        --bs-modal-margin: 0.5rem;
    }

    .modal-lg {
        max-width: 95vw;
        --bs-modal-width: 95vw;
    }

    .chat-history {
        max-height: 300px !important;
    }

    .message-content {
        max-width: 90%;
    }

    .btn-group-vertical .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    textarea.form-control {
        min-height: 100px;
        font-size: 16px;
    }

    .timeline::before {
        left: -10px;
        width: 2px;
    }

    .timeline-item {
        margin-left: 30px;
    }

    .timeline-item::before {
        left: -28px;
        width: 16px;
        height: 16px;
        top: 4px;
    }

    .card {
        margin-bottom: 0.75rem;
    }

    .card-body {
        padding: 1rem;
    }

    .row {
        --bs-gutter-x: 0.75rem;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    .row {
        margin-left: -0.75rem;
        margin-right: -0.75rem;
    }

    .col,
    [class*="col-"] {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    .stat-icon {
        min-width: 50px;
        font-size: 1.25rem;
    }

    .card-body {
        padding: 1rem;
    }

    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }

    .form-label {
        font-size: 0.9rem;
    }

    .form-control,
    .form-select {
        font-size: 0.9rem;
        padding: 0.5rem 0.75rem;
    }

    .display-5 {
        font-size: 1.5rem !important;
    }

    .nav-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
    }

    .nav-tabs .nav-link {
        padding: 0.5rem 1rem;
        white-space: nowrap;
    }
}

/* ============================================
   DARK MODE ENHANCEMENTS
   ============================================ */

body[data-bs-theme="dark"] {
    --light-bg: #1a1a1a;
}

body[data-bs-theme="dark"] .card-header {
    background-color: #333 !important;
    border-color: #444;
}

body[data-bs-theme="dark"] .bg-light {
    background-color: #2a2a2a !important;
    color: #e0e0e0;
}

body[data-bs-theme="dark"] .text-muted {
    color: #999 !important;
}

body[data-bs-theme="dark"] .alert {
    background-color: #2a2a2a;
    border-color: #444;
    color: #e0e0e0;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .navbar,
    footer,
    .btn,
    [data-bs-toggle],
    .modal {
        display: none !important;
    }

    .trip-card {
        page-break-inside: avoid;
    }

    body {
        background: white;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.fade-in {
    animation: fadeIn 0.5s ease;
}

.slide-in-left {
    animation: slideInLeft 0.5s ease;
}

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

.rotate-in {
    animation: rotateIn 0.5s ease;
}

@keyframes rotateIn {
    from {
        opacity: 0;
        transform: rotate(-10deg);
    }
    to {
        opacity: 1;
        transform: rotate(0);
    }
}

.transition-smooth {
    transition: var(--transition);
}

.shadow-elevation-1 {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.shadow-elevation-2 {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.shadow-elevation-3 {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

/* ============================================
   BOTTOM NAVIGATION (Material Design 3)
   ============================================ */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--md-surface);
    border-top: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-3);
    z-index: 999;
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 0.5rem;
    color: var(--md-on-surface-variant);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    background: none;
    font-size: 0.75rem;
    font-weight: 500;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
    color: var(--md-primary);
}

.bottom-nav-item i {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

/* ============================================
   FLOATING ACTION BUTTON (Material Design 3)
   ============================================ */

.fab {
    position: fixed;
    bottom: 5rem;
    right: 1.5rem;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--md-tertiary);
    color: var(--md-on-tertiary);
    border: none;
    box-shadow: var(--md-elevation-3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    z-index: 100;
    transition: var(--transition);
}

.fab:hover {
    box-shadow: var(--md-elevation-4);
    transform: scale(1.1);
}

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

/* Responsive FAB positioning */
@media (max-width: 768px) {
    .fab {
        bottom: 5.5rem;
        right: 1rem;
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
}