/* Stillgestanden Marine GPS Chartplotter v1.1 - Monochrome Sketch Layout */

:root {
    --bg-dark: #07090e;
    --panel-bg: rgba(11, 15, 25, 0.90);
    --panel-border: #cbd5e1;
    --text-primary: #ffffff;
    --text-muted: #94a3b8;
    --font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    
    /* Functional Alert Colors */
    --accent-green: #34d399;
    --accent-amber: #fbbf24;
    --accent-red: #f87171;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

html, body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: var(--font-family);
    color: var(--text-primary);
}

#gpsContainer {
    position: relative;
    width: 100vw;
    height: 100vh;
    background: #020617;
}

/* Map Canvas */
#mapCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* Security Overlay */
.overlay-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(2, 6, 23, 0.97);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.security-card {
    background: var(--panel-bg);
    border: 4px solid var(--panel-border);
    border-radius: 3vw;
    padding: 5vw 4vw;
    text-align: center;
    max-width: 80vw;
    box-shadow: 0 30px 50px rgba(0, 0, 0, 0.9);
}

.security-icon {
    font-size: 8vw;
    margin-bottom: 2vh;
}

.security-card h2 {
    font-size: 4vw;
    letter-spacing: 2px;
    color: #ffffff;
    margin-bottom: 2vh;
}

.security-card p {
    color: var(--text-muted);
    font-size: 2.5vw;
    line-height: 1.5;
    margin-bottom: 3vh;
}

.spinner {
    width: 6vw;
    height: 6vw;
    margin: 0 auto;
    border: 0.6vw solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* HUD Overlay Layer */
.hud-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 10;
}

.hidden {
    display: none !important;
}

.hud-block {
    position: absolute;
    pointer-events: auto;
}

/* Base Panel Styling (Monochrome Black & Silver) */
.hud-panel {
    background: var(--panel-bg);
    border: 0.5vw solid var(--panel-border);
    border-radius: 2.5vw;
    padding: 1.5vh 2.5vw;
    backdrop-filter: blur(10px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.85);
}

.label {
    font-size: 1.8vw;
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.2vh;
}

.value {
    color: #ffffff;
}

.unit {
    font-size: 3.0vw;
    color: var(--text-muted);
    font-weight: 700;
    margin-left: 0.4vw;
}

/* Top-Left Telemetry (Heading & Speed - Sketch Layout) */
.top-left-block {
    top: 3.5vh;
    left: 3.5vw;
    display: flex;
    flex-direction: column;
    gap: 1vh;
}

.heading-row .value {
    font-size: 7.8vw;
    font-weight: 900;
    letter-spacing: 1px;
    line-height: 1.0;
}

.speed-row .value {
    font-size: 7.5vw;
    font-weight: 900;
    letter-spacing: 1px;
    line-height: 1.0;
}

/* Top-Right Sonar Depth Sounder Box */
.top-right-block {
    top: 3.5vh;
    right: 3.5vw;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 1vh;
}

.depth-header {
    text-align: right;
    padding: 1vh 2vw;
}

.depth-header .value {
    font-size: 4.8vw;
    font-weight: 900;
}

.sonar-box {
    width: 21vw;
    height: 33vh;
    overflow: hidden;
    padding: 0;
}

#sonarCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Right Touch Controls (Zoom + / -) */
.right-controls {
    right: 3.5vw;
    bottom: 8vh;
    display: flex;
    flex-direction: column;
    gap: 2.2vh;
}

.hud-btn {
    background: var(--panel-bg);
    border: 0.5vw solid var(--panel-border);
    color: #ffffff;
    width: 21vw;
    height: 21vw;
    border-radius: 3.8vw;
    font-size: 13vw;
    font-weight: 900;
    cursor: pointer;
    backdrop-filter: blur(10px);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.85);
    transition: all 0.15s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 0;
}

.hud-btn:hover {
    background: #1e293b;
    border-color: #ffffff;
    transform: scale(1.05);
}

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

/* Status Alerts (Functional Colors) */
.hud-alerts {
    position: absolute;
    top: 28vh;
    left: 3.5vw;
    display: flex;
    flex-direction: column;
    gap: 1.5vh;
    pointer-events: auto;
}

.alert-badge {
    padding: 1vh 2vw;
    border-radius: 1.5vw;
    font-size: 2.4vw;
    font-weight: 900;
    letter-spacing: 1px;
    backdrop-filter: blur(8px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.8);
}

.alert-badge.warning {
    background: rgba(251, 191, 36, 0.4);
    border: 0.4vw solid var(--accent-amber);
    color: var(--accent-amber);
}

.alert-badge.danger {
    background: rgba(248, 113, 113, 0.4);
    border: 0.4vw solid var(--accent-red);
    color: var(--accent-red);
}

/* Bottom-Left Telemetry (Region) */
.bottom-left-block {
    bottom: 8vh;
    left: 3.5vw;
}

.sim-title {
    font-size: 5.0vw;
    font-weight: 900;
    letter-spacing: 2px;
    color: #ffffff;
}

/* FIXED BOTTOM FOOTER BAR */
.hud-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 6vh;
    background: #0b0f19;
    border-top: 0.4vw solid var(--panel-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 3.5vw;
    font-size: 2.4vw;
    color: var(--text-muted);
    pointer-events: auto;
    z-index: 20;
}

.hud-footer strong {
    color: #ffffff;
}

.hud-footer .sep {
    margin: 0 1.5vw;
    color: var(--panel-border);
}

.brand-box {
    display: flex;
    align-items: center;
    font-size: 2.4vw;
    font-weight: 900;
    letter-spacing: 2px;
    color: #ffffff;
}