:root {
    --bg-glass: rgba(15, 23, 42, 0.65);
    --border-glass: rgba(255, 255, 255, 0.15);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-cyan: #06b6d4;
    --accent-cyan-hover: #0891b2;
    --accent-orange: #f97316;
    --status-green: #22c55e;
    --status-red: #ef4444;

    /* Expanded palette */
    --accent-green: #22c55e;
    --accent-violet: #a78bfa;
    --accent-sky: #38bdf8;
    --accent-mint: #34d399;

    /* Surface hierarchy (dark → light) */
    --surface-0: rgba(5, 8, 20, 0.97);      /* deepest: modals, sidebars */
    --surface-1: rgba(10, 16, 36, 0.92);    /* cards */
    --surface-2: rgba(15, 25, 52, 0.80);    /* inset panels, inputs */
    --surface-3: rgba(22, 35, 70, 0.65);    /* hover states */

    /* Border tokens */
    --border-subtle: rgba(255, 255, 255, 0.07);
    --border-medium: rgba(255, 255, 255, 0.13);
    --border-strong: rgba(255, 255, 255, 0.22);
    --border-cyan:   rgba(6, 182, 212, 0.35);
    --border-orange: rgba(249, 115, 22, 0.35);
    --border-green:  rgba(34, 197, 94, 0.35);

    /* Typography scale */
    --text-xs:   10px;
    --text-sm:   11px;
    --text-base: 13px;
    --text-lg:   15px;
    --text-xl:   18px;

    /* Spacing */
    --gap-xs: 4px;
    --gap-sm: 8px;
    --gap-md: 12px;
    --gap-lg: 16px;
    --gap-xl: 24px;

    /* Radius */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  14px;
    --radius-pill: 999px;

    /* Shadows */
    --shadow-panel: 0 8px 40px rgba(0, 0, 0, 0.6), 0 1px 0 rgba(255,255,255,0.04) inset;
    --shadow-glow-cyan:   0 0 16px rgba(6, 182, 212, 0.4);
    --shadow-glow-orange: 0 0 16px rgba(249, 115, 22, 0.4);
    --shadow-glow-green:  0 0 16px rgba(34, 197, 94, 0.4);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-med:  0.25s ease;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    background-color: #000;
    touch-action: manipulation;
}

#cesiumContainer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: var(--radius-pill);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Animations */
@keyframes chip-appear {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes slide-up {
    from { opacity: 0; transform: translate(-50%, 10px); }
    to   { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes dot-pulse {
    0%, 100% { box-shadow: 0 0 6px currentColor; opacity: 0.8; }
    50%      { box-shadow: 0 0 12px currentColor; opacity: 1; }
}

/* Cesium UI Overrides to make it cleaner */
.cesium-widget-credits {
    display: none !important;
}

#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to the globe */
    display: flex;
    flex-direction: column;
    padding: 24px;
    box-sizing: border-box;
    z-index: 10;
}

.glass-panel {
    background: var(--surface-1);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-lg);
    padding: var(--gap-lg);
    pointer-events: auto;
    box-shadow: var(--shadow-panel);
}

h1, h2 {
    margin: 0;
    font-weight: 800;
    letter-spacing: -0.5px;
}

h1 {
    font-size: var(--text-lg);
    font-weight: 800;
    letter-spacing: -0.3px;
    background: linear-gradient(110deg, #ffffff 30%, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* WS status indicator */
#ws-text {
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.4px;
    color: var(--text-secondary);
}

.dot.connected + #ws-text {
    color: var(--accent-green);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    margin-left: auto;
}

/* Desktop: header is part of the sidebar — no separate floating panel needed */
@media (min-width: 1024px) {
    .header {
        position: static;
        background: transparent;
        border: none;
        border-bottom: 1px solid var(--border-subtle);
        border-radius: 0;
        padding: var(--gap-lg) var(--gap-lg) var(--gap-md);
        margin-bottom: 0;
        max-width: 100%;
        box-shadow: none;
        backdrop-filter: none;
    }
}

/* Mobile: keep as floating pill but improve sizing */
@media (max-width: 1023px) {
    .header {
        position: absolute;
        top: 12px;
        left: 12px;
        right: 12px;
        margin-bottom: 0;
        max-width: none;
        padding: 10px 14px;
        border-radius: var(--radius-pill);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
}

h2 {
    font-size: 16px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.dot.connected {
    background-color: var(--status-green);
    box-shadow: 0 0 8px var(--status-green);
}

.dot.disconnected {
    background-color: var(--status-red);
    box-shadow: 0 0 8px var(--status-red);
}

.commander {
    display: none;
    width: 320px;
    box-sizing: border-box;
    flex-direction: column;
    gap: 12px;
    position: absolute;
    bottom: 90px;
    left: 24px;
    right: auto;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}
.commander.show {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Form elements replaced below */

/* ── Telemetry Card ── */
#telemetry-card {
    background: var(--surface-1);
    border: 1px solid var(--border-cyan);
    border-radius: var(--radius-lg);
    padding: var(--gap-sm) var(--gap-md) var(--gap-md);
    box-shadow: var(--shadow-panel), 0 0 0 1px rgba(6,182,212,0.05) inset;
}

.tc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--gap-sm);
    padding-bottom: var(--gap-sm);
    border-bottom: 1px solid var(--border-subtle);
    cursor: default;
}

.tc-boatname {
    font-size: var(--text-base);
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 160px;
}

.tc-coords {
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 9px;
    color: var(--text-secondary);
    opacity: 0.7;
    margin-top: 2px;
    letter-spacing: 0.1px;
}

.tc-status-pill {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: var(--radius-pill);
    background: rgba(6, 182, 212, 0.12);
    color: var(--accent-cyan);
    border: 1px solid var(--border-cyan);
    flex-shrink: 0;
}

.tc-status-pill.grounded {
    background: rgba(239, 68, 68, 0.12);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.35);
}

.tc-section-label {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: rgba(6, 182, 212, 0.6);
    margin: var(--gap-sm) 0 var(--gap-xs);
}

/* 3-column layout */
.tc-columns-container {
    display: grid;
    grid-template-columns: 1.1fr 1fr 1fr;
    gap: var(--gap-sm);
}

.tc-column {
    min-width: 0;
}

/* Instrument cells — navigation grid */
.tc-instr-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-xs);
}

.tc-instr {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 5px 8px;
}

.tc-lbl {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.35);
}

.tc-val { font-size: 1rem; font-weight: 800; line-height: 1; }
.tc-val.cyan   { color: var(--accent-cyan); }
.tc-val.mint   { color: var(--accent-mint); }
.tc-val.sky    { color: var(--accent-sky); }
.tc-val.violet { color: var(--accent-violet); }

.tc-unit {
    font-size: 9px;
    color: rgba(255, 255, 255, 0.3);
    font-weight: 600;
    margin-left: 2px;
}

.tc-val-row {
    display: flex;
    align-items: baseline;
    gap: 1px;
}

/* Wind / Current env panels */
.tc-env-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--gap-xs);
    padding: var(--gap-sm) var(--gap-xs);
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.tc-env-vals { width: 100%; }

.tc-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 1px var(--gap-xs);
    gap: var(--gap-xs);
}

.tc-row .tc-lbl { width: auto; }

.tc-arrow-ring {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(56, 189, 248, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tc-curr-ring { border-color: rgba(167, 139, 250, 0.25); }

.tc-arrow-svg {
    width: 20px;
    height: 20px;
    display: block;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.tc-cardinal {
    font-size: 9px;
    font-weight: 800;
    color: rgba(56, 189, 248, 0.8);
    letter-spacing: 0.5px;
}

.tc-arrow-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
}

.twa-side-badge {
    display: inline-block;
    margin-left: 3px;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 8px;
    font-weight: 800;
    letter-spacing: 0.5px;
    vertical-align: middle;
}

.twa-side-badge.port {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.twa-side-badge.stbd {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}


.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--gap-xs);
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.4px;
    background: rgba(249, 115, 22, 0.1);
    color: var(--accent-orange);
    border: 1px solid var(--border-orange);
}

input, select {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-family: 'Inter', sans-serif;
    font-size: var(--text-sm);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
    box-sizing: border-box;
}

input:focus, select:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.15);
}

label {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 4px;
    display: block;
}

.neon-btn {
    background: var(--accent-cyan);
    color: #000;
    border: none;
    border-radius: var(--radius-sm);
    padding: 9px 14px;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
    font-size: var(--text-xs);
    letter-spacing: 0.6px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1;
}

.neon-btn:hover:not(:disabled) {
    background: #22d3ee;
    box-shadow: var(--shadow-glow-cyan);
    transform: translateY(-1px);
}

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

.neon-btn.secondary {
    background: transparent;
    border: 1px solid var(--border-orange);
    color: var(--accent-orange);
    font-weight: 700;
}

.neon-btn.secondary:hover:not(:disabled) {
    background: rgba(249, 115, 22, 0.1);
    box-shadow: var(--shadow-glow-orange);
    border-color: var(--accent-orange);
    transform: translateY(-1px);
}

.neon-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
    transform: none;
}

.feedback {
    font-size: 10px;
    min-height: 12px;
    text-align: center;
    font-weight: 600;
}

.feedback.success { color: var(--status-green); }
.feedback.error { color: var(--status-red); }

/* Panel tab switcher */
.panel-tabs {
    display: flex;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-md);
    background: var(--surface-2);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.panel-tab {
    flex: 1;
    background: transparent;
    border: none;
    border-radius: calc(var(--radius-sm) - 2px);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.5px;
    padding: 7px 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
}

.panel-tab:hover:not(.active) {
    color: var(--text-primary);
    background: var(--surface-3);
}

.panel-tab.active {
    background: var(--surface-0);
    color: var(--accent-cyan);
    box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

/* Tab content panes */
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── Race panel ────────────────────────────────────────────────────────── */
.race-panel {
    display: flex;
    flex-direction: column;
    gap: 10px;
}




.race-feedback {
    font-size: 10px;
    min-height: 12px;
    text-align: center;
    font-weight: 600;
}
.race-feedback.success { color: var(--status-green); }
.race-feedback.error   { color: var(--status-red); }

/* ── Race selector dropdown ─────────────────────────────────────────────── */
#race-select {
    width: 100%;
    box-sizing: border-box;
    font-size: 11px;
    padding: 6px 8px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

#race-select option {
    background: #0f172a;
    color: #e2e8f0;
}

/* Disabled state for neon-btn */
.neon-btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
    pointer-events: none;
}

/* Active race chip */
.active-race-chip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-sm);
    padding: 8px var(--gap-md);
    background: rgba(249, 115, 22, 0.08);
    border: 1px solid var(--border-orange);
    border-radius: var(--radius-md);
}

.arc-info {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow: hidden;
}

.arc-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-orange);
    box-shadow: var(--shadow-glow-orange);
    flex-shrink: 0;
    animation: dot-pulse-orange 2.5s ease-in-out infinite;
}

.arc-name {
    font-size: var(--text-xs);
    font-weight: 800;
    color: var(--accent-orange);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.arc-leave {
    flex-shrink: 0;
    padding: 4px 8px;
    font-size: 9px;
    border-color: rgba(249, 115, 22, 0.45);
    color: rgba(249, 115, 22, 0.85);
}

.arc-leave:hover {
    background: rgba(249, 115, 22, 0.15) !important;
    box-shadow: 0 0 10px rgba(249, 115, 22, 0.25) !important;
}

/* Practice mode chip variant */
.active-race-chip.practice-mode {
    background: var(--surface-3);
    border-color: var(--border-medium);
}

.active-race-chip.practice-mode .arc-dot {
    background: var(--text-secondary);
    box-shadow: none;
}

.active-race-chip.practice-mode .arc-name {
    color: var(--text-secondary);
}

.active-race-chip.practice-mode .arc-leave {
    border-color: var(--border-medium);
    color: var(--text-secondary);
}


/* ── Leaderboard ────────────────────────────────────────────────────────── */
#leaderboard-section {
    margin-top: 4px;
}

.lb-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.lb-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.lb-refresh-btn {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--text-secondary);
    border-radius: 6px;
    padding: 3px 8px;
    font-size: 10px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: all 0.2s;
}
.lb-refresh-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* Leaderboard */
.lb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-xs);
}

.lb-table th {
    text-align: left;
    color: var(--text-secondary);
    font-weight: 700;
    padding: 4px 6px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lb-table td {
    padding: 6px 6px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
    vertical-align: middle;
    font-size: var(--text-xs);
}

.lb-table tr:last-child td { border-bottom: none; }

.lb-table tr:hover td { background: var(--surface-3); }

.rank-medal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    font-weight: 800;
    font-size: 10px;
}

.rank-1 { background: rgba(255,215,0,0.2);  color: #ffd700; box-shadow: 0 0 6px rgba(255,215,0,0.3); }
.rank-2 { background: rgba(192,192,192,0.2);color: #c0c0c0; box-shadow: 0 0 6px rgba(192,192,192,0.2); }
.rank-3 { background: rgba(205,127,50,0.2); color: #cd7f32; box-shadow: 0 0 6px rgba(205,127,50,0.2); }
.rank-n { background: rgba(255,255,255,0.06); color: var(--text-secondary); }

.lb-wp-badge {
    display: inline-block;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid var(--border-cyan);
    color: var(--accent-cyan);
    border-radius: var(--radius-sm);
    padding: 1px 5px;
    font-size: 9px;
    font-weight: 800;
}

.lb-finish-badge {
    display: inline-block;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--border-green);
    color: var(--accent-green);
    border-radius: var(--radius-sm);
    padding: 1px 5px;
    font-size: 9px;
    font-weight: 800;
}

.lb-finish-badge {
    display: inline-block;
    background: rgba(34,197,94,0.12);
    border: 1px solid rgba(34,197,94,0.3);
    color: #22c55e;
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 10px;
    font-weight: 700;
}

/* Waypoint marker label */
.wp-label-dot {
    animation: wp-pulse 2s ease-in-out infinite;
}

@keyframes wp-pulse {
    0%,100% { opacity: 1; }
    50%      { opacity: 0.5; }
}

/* ── Bottom Navbar ──────────────────────────────────────────────────────── */
.bottom-navbar {
    position: absolute;
    bottom: var(--gap-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--gap-sm);
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    padding: 6px var(--gap-md);
    box-shadow: var(--shadow-panel);
    z-index: 30;
    pointer-events: auto;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    cursor: pointer;
    padding: 6px var(--gap-sm);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    color: var(--text-primary);
    background: var(--surface-2);
}

.nav-btn.active {
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

/* Global Tools Menu */
.tools-menu {
    position: absolute;
    bottom: 80px;
    right: var(--gap-lg);
    z-index: 100;
    min-width: 250px;
    border-radius: var(--radius-lg);
    background: var(--surface-1);
    border: 1px solid var(--border-cyan);
    box-shadow: var(--shadow-panel);
    padding: var(--gap-lg);
    display: none; /* controlled by JS */
    pointer-events: auto;
}

.tools-menu .switch {
    transform: scale(0.85);
    margin-right: -4px;
}

.tools-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--gap-md);
    padding-bottom: var(--gap-sm);
    border-bottom: 1px solid var(--border-subtle);
}

.tools-header h3 {
    margin: 0;
    font-size: var(--text-sm);
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tools-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--gap-sm);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
}

/* ── Toggle Switch ──────────────────────────────────────────────────────── */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.2);
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--accent-cyan);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--accent-cyan);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 24px;
}

.slider.round:before {
  border-radius: 50%;
}


.nav-btn:hover,
.nav-btn.active {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-icon {
    font-size: 20px;
}

.nav-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ── Mobile Responsiveness ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    #ui-overlay {
        padding: 12px;
    }

    .header {
        max-width: 100%;
        margin-bottom: 12px;
    }

    /* Telemetry Card: drawer under header on mobile */
    #telemetry-card {
        width: calc(100% - 24px);
        max-width: 100%;
        box-sizing: border-box;
        margin: 0;
        padding: 8px 10px;
        position: absolute;
        top: 85px; /* Under the header */
        bottom: auto;
        left: 12px;
        z-index: 25;
        border-radius: 12px;
        transition: transform 0.3s ease;
    }

    #telemetry-card.collapsed .tc-columns-container {
        display: none;
    }
    
    #telemetry-card.collapsed .tc-mobile-summary {
        display: flex !important;
    }

    #telemetry-card.collapsed .tc-mobile-toggle {
        transform: rotate(180deg);
    }

    .tc-mobile-toggle {
        display: inline-block;
        transition: transform 0.3s ease;
    }

    .tc-boatname { font-size: 0.8rem; max-width: 140px; }
    .tc-val       { font-size: 0.8rem; }
    .tc-lbl       { font-size: 0.45rem; }
    .tc-unit      { font-size: 0.5rem; }
    .tc-section-label { font-size: 0.5rem; margin: 4px 0 2px; }
    .tc-coords    { font-size: 0.5rem; }
    .tc-instr-grid { gap: 4px; }
    .tc-instr { padding: 4px 6px; }
    .tc-env-row   { gap: 4px; padding: 4px; margin-bottom: 4px; }
    .tc-arrow-ring { width: 24px; height: 24px; }
    .tc-arrow-svg  { width: 14px; height: 14px; }
    .tc-fly-btn { padding: 4px; font-size: 0.6rem; }

    /* Commander Panel */
    .commander {
        display: none; /* hidden by default */
        width: calc(100% - 24px);
        max-width: 300px;
        left: 12px;
        right: auto;
        bottom: 110px;
        box-sizing: border-box;
        max-height: 48vh; /* Prevent it from taking over the whole screen */
        overflow-y: auto; /* Allow scrolling */
        margin-top: 0;
        gap: 8px;
        padding: 8px 10px;
    }

    .commander.show {
        display: flex;
    }

    /* Scale down elements inside commander on mobile */
    .commander .panel-tabs {
        margin-bottom: 10px;
        gap: 4px;
    }

    .commander .panel-tab {
        font-size: 10px;
        padding: 6px 0;
    }

    .commander label {
        font-size: 10px;
    }

    .commander input, 
    .commander select {
        padding: 8px 10px;
        font-size: 12px;
        border-radius: 6px;
    }

    .commander .neon-btn {
        padding: 8px 10px;
        font-size: 11px;
        border-radius: 6px;
    }

    .commander .feedback, 
    .commander .race-feedback {
        font-size: 10px;
        min-height: 12px;
    }

    .commander .observer-notice {
        gap: 8px;
        padding: 8px 10px;
        margin-bottom: 6px;
    }

    .commander .obs-icon {
        font-size: 16px;
    }

    .commander .obs-title {
        font-size: 11px;
        margin-bottom: 1px;
    }

    .commander .obs-sub {
        font-size: 9px;
    }

    .commander .my-boat-chip {
        gap: 6px;
        padding: 6px 10px;
        margin-bottom: 8px;
        border-radius: 8px;
    }

    .commander .my-boat-dot {
        width: 8px;
        height: 8px;
    }

    .commander .my-boat-label {
        font-size: 9px;
    }

    .commander .my-boat-name {
        font-size: 11px;
    }

    .commander .btn-fly-chip {
        padding: 3px 6px !important;
        font-size: 9px !important;
        border-radius: 4px !important;
    }

    .commander .active-race-chip {
        padding: 6px 10px;
        gap: 6px;
        border-radius: 8px;
    }

    .commander .arc-dot {
        width: 6px;
        height: 6px;
    }

    .commander .arc-name {
        font-size: 10px;
    }

    .commander .arc-leave {
        padding: 3px 6px !important;
        font-size: 9px !important;
    }

    .commander .lb-header {
        margin-bottom: 4px;
    }

    .commander .lb-title {
        font-size: 9px;
    }

    .commander .lb-refresh-btn {
        padding: 2px 6px;
        font-size: 9px;
        border-radius: 4px;
    }

    .commander .lb-table th {
        padding: 2px 4px;
        font-size: 9px;
    }

    .commander .lb-table td {
        padding: 4px 4px;
        font-size: 9px;
    }

    .commander .rank-medal {
        width: 16px;
        height: 16px;
        font-size: 9px;
    }

    .commander .lb-wp-badge, 
    .commander .lb-finish-badge {
        padding: 1px 3px;
        font-size: 8px;
    }

    /* Adjust padding in glass panels for tighter fit on small screens */
    .glass-panel {
        padding: 14px;
    }
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: var(--gap-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
    z-index: 2000;
    pointer-events: none;
}

.toast {
    background: var(--surface-1);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-medium);
    border-left: 3px solid var(--accent-cyan);
    color: var(--text-primary);
    padding: var(--gap-md) var(--gap-lg);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    box-shadow: var(--shadow-panel);
    animation: slide-up var(--transition-fast) ease-out;
}
.toast.error { border-left-color: #ef4444; }
.toast.success { border-left-color: var(--accent-green); }

/* ── Regatta Modal ──────────────────────────────────────────────────────── */
/* ── Regatta Modal ──────────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    pointer-events: auto;
}

.regatta-card {
    width: 340px;
    padding: var(--gap-xl);
    text-align: center;
}

.regatta-card h2 {
    color: var(--accent-cyan);
    margin-bottom: var(--gap-sm);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.regatta-card h1 {
    font-size: 28px;
    margin-bottom: var(--gap-lg);
    background: linear-gradient(110deg, #fff 30%, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.regatta-card .countdown {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 32px;
    font-weight: 800;
    color: var(--accent-orange);
    background: rgba(249, 115, 22, 0.1);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(249, 115, 22, 0.3);
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.5);
}

/* ── My Boat identity chip ────────────────────────────────────────────────── */
.my-boat-chip {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    padding: var(--gap-sm) var(--gap-md);
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid var(--border-green);
    border-radius: var(--radius-md);
    margin-bottom: var(--gap-md);
}

/* Fly button on my-boat-chip */
.btn-fly-chip {
    background: rgba(34, 197, 94, 0.15) !important;
    border: 1px solid rgba(34, 197, 94, 0.4) !important;
    color: #22c55e !important;
    padding: 4px 8px !important;
    font-size: 10px !important;
    border-radius: 6px !important;
    text-transform: uppercase !important;
    font-weight: 700 !important;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
    margin-left: auto;
}
.btn-fly-chip:hover {
    background: rgba(34, 197, 94, 0.3) !important;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.3) !important;
}

.my-boat-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: var(--shadow-glow-green);
    flex-shrink: 0;
}

.my-boat-label {
    font-size: 9px;
    font-weight: 800;
    color: var(--accent-green);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.my-boat-name {
    font-size: var(--text-xs);
    font-weight: 800;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── Observer notice ──────────────────────────────────────────────────────── */
.observer-notice {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
    padding: var(--gap-lg);
    background: var(--surface-2);
    border: 1px dashed var(--border-subtle);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-sm);
}

.obs-icon { font-size: 20px; opacity: 0.8; }
.obs-title {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}
.obs-sub { font-size: 10px; color: var(--text-secondary); line-height: 1.4; }

/* ── Leaderboard — highlight my own row ───────────────────────────────────── */
.lb-my-row td {
    background: rgba(34, 197, 94, 0.06) !important;
}

.lb-me-badge {
    display: inline-block;
    background: rgba(34, 197, 94, 0.18);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: #22c55e;
    border-radius: 3px;
    padding: 1px 4px;
    font-size: 8px;
    font-weight: 800;
    letter-spacing: 0.5px;
    margin-right: 3px;
    vertical-align: middle;
}

/* ── Registration modal panes ──────────────────────────────────────────────── */
/* ── Registration modal panes ──────────────────────────────────────────────── */
.auth-card { padding: var(--gap-xl); }

.reg-tabs {
    display: flex;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-lg);
    background: var(--surface-2);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.reg-tab {
    flex: 1;
    background: transparent;
    border: none;
    border-radius: calc(var(--radius-sm) - 2px);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: var(--text-sm);
    font-weight: 700;
    padding: 8px 0;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reg-tab:hover:not(.active) {
    color: var(--text-primary);
    background: var(--surface-3);
}

.reg-tab.active {
    background: var(--surface-0);
    color: var(--accent-cyan);
    box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

/* ── Registration modal panes ──────────────────────────────────────────────── */
.reg-pane { display: none; }
.reg-pane.active { display: block; }

.reg-hint {
    font-size: 11px;
    color: var(--text-secondary);
    margin: 0 0 10px;
    line-height: 1.4;
}

/* ── Maneuver Node System ──────────────────────────────────────────────── */
.maneuver-section {
    margin-top: var(--gap-lg);
    border-top: 1px solid var(--border-subtle);
    padding-top: var(--gap-md);
}

.maneuver-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 9px;
    font-weight: 800;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--gap-sm);
}

.maneuver-list {
    display: flex;
    flex-direction: column;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-md);
}

.maneuver-node {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 6px var(--gap-sm);
    font-size: 10px;
}

.maneuver-node .node-index { color: var(--accent-cyan); font-weight: 800; margin-right: var(--gap-sm); }
.maneuver-node .node-desc { color: var(--text-primary); flex: 1; }
.maneuver-node .node-time { color: var(--accent-orange); font-weight: 700; margin-right: var(--gap-sm); font-size: 9px; }

.maneuver-node .btn-remove-node {
    background: transparent;
    border: none;
    color: var(--status-red);
    cursor: pointer;
    font-size: 14px;
    padding: 0 4px;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.maneuver-node .btn-remove-node:hover { opacity: 1; }

/* Add Maneuver Bottom Sheet */
.bottom-sheet {
    position: fixed;
    bottom: -100%;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px;
    box-sizing: border-box;
    transition: bottom 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
    border-radius: 16px 16px 0 0;
    display: flex;
    justify-content: center;
}

.bottom-sheet.show {
    bottom: 0;
}

.bottom-sheet-content {
    width: 100%;
    max-width: 400px;
}

.bottom-sheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.bottom-sheet-header h3 {
    margin: 0;
    color: var(--accent-cyan);
    font-size: 14px;
}

.bottom-sheet-header .btn-close-sheet {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
}

.stepper-group {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}

.stepper-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 6px 0;
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
}

.stepper-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ── Compass Rose ──────────────────────────────────────────────────────── */
#compass-rose-container { width: 100%; }
#compass-rose-svg {
    border-radius: 50%;
    background: var(--surface-3);
    box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
}

/* ── Desktop Layout ──────────────────────────────────────────────────────── */
@media (min-width: 1024px) {
    #observer-note {
        position: absolute;
        bottom: 80px;
        left: calc(300px + (100vw - 300px) / 2);
        transform: translateX(-50%);
        margin-left: 0;
    }
    .sidebar {
        position: absolute;
        top: 0;
        left: 0;
        width: 300px;           /* tighter than 320px — saves globe space */
        height: 100vh;
        overflow-y: auto;
        overflow-x: hidden;
        padding: 0;             /* header handles its own padding */
        background: var(--surface-0);
        border-right: 1px solid var(--border-subtle);
        backdrop-filter: blur(20px) saturate(1.5);
        display: flex;
        flex-direction: column;
        gap: 0;                 /* sections handle their own spacing */
        z-index: 20;
        pointer-events: auto;
        scrollbar-width: thin;
        scrollbar-color: var(--border-medium) transparent;
    }

    /* Each glass-panel inside sidebar loses its border-radius and merges flush */
    .sidebar .glass-panel {
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: none;
        border-bottom: 1px solid var(--border-subtle);
        box-shadow: none;
        background: transparent;
        padding: var(--gap-md) var(--gap-lg);
    }

    .sidebar .glass-panel:last-child {
        border-bottom: none;
        flex: 1;
    }

    #telemetry-card {
        position: static;
        max-width: 100%;
        border-radius: 0;
        border: none;
        border-bottom: 1px solid var(--border-subtle);
        box-shadow: none;
        background: transparent;
        margin: 0;
        padding: var(--gap-md) var(--gap-lg);
    }
    #telemetry-card.collapsed .tc-columns-container {
        display: flex !important;
    }
    #telemetry-card.collapsed .tc-mobile-summary {
        display: none !important;
    }
    .tc-mobile-toggle {
        display: none !important;
    }
    .commander {
        position: static;
        width: 100%;
        max-height: none;
        display: flex;
        background: transparent;
        border: none;
        box-shadow: none;
        border-radius: 0;
        padding: var(--gap-md) var(--gap-lg);
        flex: 1;
        overflow-y: auto;
    }
    .bottom-navbar {
        position: absolute;
        bottom: var(--gap-xl);
        left: calc(300px + (100vw - 300px) / 2);
        transform: translateX(-50%);
        border-radius: var(--radius-pill);
        gap: var(--gap-lg);
    }
}

/* Task 1 — Lobby race cards */
.race-lobby-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 14px 16px;
    position: relative;
}
.race-lobby-card img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
}
.race-lobby-card-body {
    flex: 1;
    overflow: hidden;
}
.race-lobby-card-name {
    font-size: 16px;
    font-weight: 800;
    color: var(--accent-cyan);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.race-lobby-card-time {
    font-size: 12px;
    color: var(--text-secondary);
}
.race-lobby-card-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    flex-shrink: 0;
}
.race-lobby-boats-badge {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-orange);
}

/* Task 4 — Edit node button */
.btn-edit-node {
    background: transparent;
    border: none;
    color: var(--accent-cyan);
    cursor: pointer;
    font-size: 14px;
    padding: 0 4px;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}
.btn-edit-node:hover { opacity: 1; }