:root {
    --primary-color: #1d1d1f;
    --primary-hover: #000000;
    --accent-color: #0071e3;
    --secondary-color: #f5f5f7;
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    --border-color: #d2d2d7;
    --bg-body: #f5f5f7;
    --bg-card: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
    --radius-md: 12px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 1rem 0;
}

.navbar-brand {
    color: var(--text-main) !important;
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
}

.nav-link {
    color: var(--text-main) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--accent-color) !important;
    background-color: rgba(0, 113, 227, 0.05);
}

.nav-item.btn-nav a {
    background-color: var(--primary-color);
    color: white !important;
    padding: 0.6rem 1.5rem !important;
    border-radius: 999px;
    margin-left: 0.5rem;
    font-weight: 600;
}

.nav-item.btn-nav a:hover {
    background-color: var(--primary-hover);
    transform: scale(1.02);
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

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

/* Card with hover lift — only for billboard cards, NOT for map wrappers */
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-map {
    overflow: visible !important;
}

.card-map .card-body {
    overflow: visible !important;
    padding: 0 !important;
}

.card-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    font-weight: 600;
    padding: 1.5rem;
}

.card-body {
    padding: 2rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 999px;
    font-weight: 600;
    padding: 0.8rem 1.5rem;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
    transform: scale(1.02);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 999px;
    font-weight: 600;
}

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

/* Map */
#billboardMap {
    height: 500px;
    width: 100%;
    display: block;
}

/* Images */
.billboard-thumb {
    height: 240px;
    object-fit: cover;
    width: 100%;
    border-bottom: 1px solid rgba(0,0,0,0.03);
}

.billboard-detail {
    height: 450px;
    object-fit: cover;
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

/* Forms */
.form-control, .form-select {
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 0.8rem 1.2rem;
    background-color: var(--secondary-color);
    font-weight: 500;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    background-color: #ffffff;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
}

.input-group-text {
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

/* Badges */
.badge {
    padding: 0.5em 1em;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* Footer */
.footer {
    background-color: #ffffff;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding: 4rem 0 2rem;
    margin-top: auto;
}

.footer-title {
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 500;
}

.footer-link:hover {
    color: var(--primary-color);
}

/* Utilities */
.text-muted {
    color: var(--text-muted) !important;
}

/* text-primary → accent blue (not dark) so it stays visible on any background */
.text-primary {
    color: var(--accent-color) !important;
}

/* bg-primary stays dark for buttons/backgrounds; use inline styles for tinted bg */
.bg-primary {
    background-color: var(--primary-color) !important;
}

/* Accent text helper */
.text-accent {
    color: var(--accent-color) !important;
}

.page-title {
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

main {
    flex: 1;
}

/* Flatpickr Customization */
.flatpickr-calendar {
    border-radius: var(--radius-md) !important;
    border: none !important;
    box-shadow: var(--shadow-md) !important;
    padding: 10px !important;
}
.flatpickr-day.selected, .flatpickr-day.startRange, .flatpickr-day.endRange,
.flatpickr-day.selected.inRange, .flatpickr-day.startRange.inRange, .flatpickr-day.endRange.inRange,
.flatpickr-day.selected:focus, .flatpickr-day.startRange:focus, .flatpickr-day.endRange:focus,
.flatpickr-day.selected:hover, .flatpickr-day.startRange:hover, .flatpickr-day.endRange:hover,
.flatpickr-day.selected.prevMonthDay, .flatpickr-day.startRange.prevMonthDay, .flatpickr-day.endRange.prevMonthDay,
.flatpickr-day.selected.nextMonthDay, .flatpickr-day.startRange.nextMonthDay, .flatpickr-day.endRange.nextMonthDay {
    background: var(--accent-color) !important;
    border-color: var(--accent-color) !important;
    color: #fff !important;
}

.flatpickr-day.inRange {
    background: rgba(0,113,227,.12) !important;
    border-color: transparent !important;
    color: #0071e3 !important;
}

.flatpickr-day.disabled, .flatpickr-day.disabled:hover {
    background: rgba(234,84,85,.08) !important;
    color: #ea5455 !important;
    text-decoration: line-through;
}

.flatpickr-months .flatpickr-month,
.flatpickr-current-month .flatpickr-monthDropdown-months {
    color: #1d1d1f;
}