body {
    background: url('../assets/car.jpg') no-repeat center center fixed;
    background-size: cover;
    margin: 0;
    height: 100vh;
    width: 100vw;
    font-family: 'Inter', -apple-system, sans-serif;
}

.interface-content {
    background: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
}

.tracker-panel {
    background-color: aliceblue;
    padding: 2.5rem;
    border-radius: 40px;
    width: 90%;
    max-width: 850px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.status-msg {
    background-color: #fee2e2;
    color: #b91c1c;
    border: 2px solid #fecaca;
    padding: 15px 25px;
    border-radius: 15px;
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0 0 20px 0;
    width: 100%;
    box-sizing: border-box;
    text-align: center;
    display: block;
}

.hidden {
    display: none;
}

.login-size {
    max-width: 420px;
    min-height: auto;
}

/* --- TIMER --- */
.global-timer {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3.5rem;
    font-weight: 800;
    color: #1e293b;
    background: #f1f5f9;
    padding: 10px 40px;
    border-radius: 24px;
    margin-bottom: 25px;
    border: 1px solid rgba(0,0,0,0.1);
}

/* --- 4x2 GRID --- */
.button-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 95px);
    gap: 15px;
    width: 100%;
}

.button-grid button {
    font-size: 2.5rem;
    font-weight: 700;
    border-radius: 20px;
    background: #0f172a;
    color: #ffffff;
    border: none;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.button-grid button:active:not(:disabled) {
    transform: scale(0.94);
    background: #334155;
}

.button-grid button:disabled {
    background: #cbd5e1;
    color: #94a3b8;
    box-shadow: none;
    cursor: not-allowed;
}

/* --- ERROR & LOG STYLES --- */
.error-message {
    color: #e11d48;
    font-weight: 400;
    margin-top: 15px;
}

.history-panel {
    margin-top: 30px;
    width: 100%;
}

.lap-log {
    max-height: 220px;
    overflow-y: auto;
    background: #ffffff;
    border-radius: 20px;
    padding: 15px;
    border: 1px solid #e2e8f0;
    scroll-behavior: smooth;
}

.log-entry {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    padding: 10px;
    border-bottom: 1px solid #f1f5f9;
    display: flex;
    justify-content: space-between;
}

.time { color: #10b981; font-weight: bold; }

@media (max-width: 640px) {
    /* --- 2x4 GRID --- */
.button-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, 95px);
    gap: 15px;
    width: 100%;
}
}