/* Base variables and design tokens */
:root {
    color-scheme: dark;
    --bg-base: #090a0f;
    --bg-surface: rgba(13, 15, 24, 0.75);
    --bg-elevated: rgba(22, 26, 41, 0.6);
    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(16, 185, 129, 0.4);

    --text: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    /* Accents */
    --accent: #10b981;
    --accent-glow: rgba(16, 185, 129, 0.25);
    --accent-dim: rgba(16, 185, 129, 0.15);
    --accent-cyan: #06b6d4;
    --accent-cyan-glow: rgba(6, 182, 212, 0.25);
    --accent-amber: #f59e0b;

    --font-sans:
        "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --glass-blur: blur(16px);
    --sidebar-w: 320px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    font-size: 14px;
    background: var(--bg-base);
    color: var(--text);
}

/* ── Layout ─────────────────────────────────────────── */

#app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ── Sidebar ─────────────────────────────────────────── */

#sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    height: 100%;
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.subtitle {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-top: 6px;
}

.logo {
    display: block;
    width: calc(var(--sidebar-w) - 48px);
    height: auto;
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

.sidebar-body {
    flex: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.sidebar-body::-webkit-scrollbar {
    width: 4px;
}
.sidebar-body::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar-body::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

/* ── Nav sections ────────────────────────────────────── */

.nav-section {
    padding: 18px 0;
    border-bottom: 1px solid var(--border);
}

.nav-section:last-child {
    border-bottom: none;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text);
    padding: 0 24px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-section-title::before {
    content: "";
    display: inline-block;
    width: 3px;
    height: 10px;
    border-radius: 1.5px;
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow);
}

.nav-section-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 24px;
}

/* ── Controls ────────────────────────────────────────── */

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    padding: 4px 0;
    user-select: none;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.toggle-row:hover {
    color: var(--text);
}

.toggle-row input[type="checkbox"] {
    accent-color: var(--accent);
    cursor: pointer;
    width: 15px;
    height: 15px;
}

.input-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 4px 0;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-row input[type="number"] {
    width: 76px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 5px 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 13px;
    text-align: right;
    outline: none;
    transition: var(--transition-smooth);
}

.input-row input[type="number"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow);
}

.input-row select {
    width: 105px;
    background: rgba(13, 15, 24, 0.9);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 5px 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 13px;
    outline: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.input-row select:focus {
    border-color: var(--accent);
}

.control-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 6px 0;
}

.control-header {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

#sweep-angle-val,
#brightness-val {
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
}

.control-row input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 5px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    transition: var(--transition-smooth);
    margin: 4px 0;
}

.control-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
    transition: var(--transition-smooth);
}

.control-row input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.25);
    background: #059669;
}

.control-row input[type="range"]:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.control-row input[type="range"]:disabled::-webkit-slider-thumb {
    background: var(--text-muted);
    box-shadow: none;
    cursor: not-allowed;
}

/* ── Buttons ─────────────────────────────────────────── */

.btn {
    width: 100%;
    padding: 11px 16px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-smooth);
    border: 1px solid var(--border);
}

.btn-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.9;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #059669);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 15px var(--accent-dim);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    background: var(--text-muted);
    opacity: 0.3;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    box-shadow: none;
}

/* ── Map ─────────────────────────────────────────────── */

#map-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    height: 100%;
}

#map {
    width: 100%;
    height: 100%;
}

/* Leaflet dark overrides */
.leaflet-bar a {
    background-color: #131724 !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-bottom: 1px solid var(--border) !important;
}

.leaflet-bar a:hover {
    background-color: #1e2438 !important;
    color: var(--accent) !important;
}

.leaflet-control-zoom {
    border: none !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5) !important;
    border-radius: 8px !important;
    overflow: hidden;
}

.leaflet-control-attribution {
    background: rgba(9, 10, 15, 0.8) !important;
    color: var(--text-muted) !important;
    font-size: 10px;
    font-family: var(--font-sans);
}

.leaflet-control-attribution a {
    color: var(--text-muted) !important;
}

/* ── Drop zones ──────────────────────────────────────── */

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 16px 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.01);
    transition: var(--transition-smooth);
    cursor: pointer;
}

.drop-icon {
    width: 28px;
    height: 28px;
    color: var(--text-muted);
    margin-bottom: 4px;
    transition: var(--transition-smooth);
    flex-shrink: 0;
}

.drop-zone:hover .drop-icon {
    color: var(--accent);
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

.drop-zone:hover {
    border-color: var(--accent);
    background: rgba(16, 185, 129, 0.03);
}

.drop-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.drop-hint {
    font-size: 11px;
    color: var(--text-muted);
}

.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(16, 185, 129, 0.08);
}

.drop-zone.drag-over .drop-icon {
    color: var(--accent);
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

.drop-zone.has-file {
    border-color: var(--accent);
    border-style: solid;
    background: rgba(16, 185, 129, 0.02);
}

.drop-zone.has-file .drop-icon {
    color: var(--accent);
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

/* ── Zone list ───────────────────────────────────────── */

#zone-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.zone-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: var(--transition-smooth);
}

.zone-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.zone-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 6px currentColor;
}

.zone-name {
    flex: 1;
    font-size: 12px;
    font-weight: 500;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.zone-remove {
    flex-shrink: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 15px;
    line-height: 1;
    padding: 0 4px;
    transition: var(--transition-smooth);
}

.zone-remove:hover {
    color: #ef4444;
    transform: scale(1.2);
}

/* ── Floating Map Controls ───────────────────────────── */

.map-controls-card {
    position: absolute;
    top: 24px;
    right: 24px;
    z-index: 1000;
    background: rgba(13, 15, 24, 0.85);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    width: 170px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    pointer-events: auto;
    transition: var(--transition-smooth);
}

.map-controls-card .card-title {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.06em;
    margin-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 4px;
}

.map-controls-card .toggle-row {
    font-size: 12px;
    gap: 8px;
    padding: 3px 0;
    color: var(--text-secondary);
}

.map-controls-card .toggle-row:hover {
    color: var(--text);
}

.map-controls-card .control-header {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

/* ── Floating Statistics Panel ───────────────────────── */

.stats-panel {
    position: absolute;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    width: 520px;
    background: rgba(13, 15, 24, 0.85);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 16px 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: auto;
}

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

.stats-header h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: var(--transition-smooth);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.06);
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.1;
}

.stat-unit {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 2px;
    font-weight: 500;
}

#stat-area {
    color: var(--accent);
}

#stat-distance {
    color: var(--accent-cyan);
}

#stat-duration {
    color: var(--accent-amber);
}

.map-tile-satellite {
    filter: brightness(var(--map-brightness, 100%));
}

/* ── Units toggle ────────────────────────────────────── */

.units-toggle {
    display: flex;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
}

.units-btn {
    flex: 1;
    padding: 5px 0;
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.units-btn:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
}

.units-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* ── Help Button & Modal ─────────────────────────────── */

.btn-help {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    margin-left: auto;
    transition: var(--transition-smooth);
}

.btn-help svg {
    width: 17px;
    height: 17px;
}

.btn-help:hover {
    color: var(--accent);
    transform: scale(1.15);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(4, 5, 8, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: rgba(18, 20, 32, 0.9);
    border: 1px solid var(--border);
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    background: linear-gradient(90deg, #ffffff 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    transition: var(--transition-smooth);
}

.btn-close svg {
    width: 18px;
    height: 18px;
}

.btn-close:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    font-size: 13.5px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.modal-body p {
    margin-bottom: 16px;
}

.modal-body p strong {
    color: var(--text);
}

.modal-body h4 {
    color: var(--accent);
    margin: 20px 0 8px 0;
    font-size: 14px;
    font-weight: 600;
}

.modal-body h4:first-of-type {
    margin-top: 0;
}

.modal-body code {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
    color: var(--text);
}

.modal-body ul {
    margin-bottom: 16px;
    padding-left: 20px;
}

.modal-body li {
    margin-bottom: 6px;
}

.modal-body li strong {
    color: var(--text);
}

/* Custom scrollbar for modal-body */
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}