@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #eab308;
    --display-bg: #020617;
    --display-text: #22c55e;
    --font-ui: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    background-color: var(--panel-bg);
    border-radius: 16px;
    padding: 32px;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 16px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.indicator.disconnected { background-color: var(--danger-color); box-shadow: 0 0 8px rgba(239, 68, 68, 0.5); }
.indicator.connected { background-color: var(--success-color); box-shadow: 0 0 8px rgba(34, 197, 94, 0.5); }

.scale-display {
    background-color: var(--display-bg);
    border-radius: 12px;
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 2px solid rgba(255,255,255,0.05);
}

.weight-container {
    font-family: var(--font-mono);
    display: flex;
    align-items:baseline;
    gap: 8px;
    color: var(--display-text);
    text-shadow: 0 0 10px rgba(34, 197, 94, 0.4);
}

.sign {
    font-size: 3rem;
    width: 1ch;
    text-align: right;
}

.value {
    font-size: 5rem;
    font-weight: 700;
    letter-spacing: -2px;
}

.unit {
    font-size: 2rem;
    color: var(--text-secondary);
}

.status-tags {
    margin-top: 16px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 12px;
    background-color: rgba(255,255,255,0.1);
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
    transition: all 0.3s;
}

.tag.active {
    background-color: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

.error-tag.active {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn.primary:not(:disabled):hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn.secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn.secondary:not(:disabled):hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.btn.warning {
    background-color: var(--danger-color);
    color: white;
}
.btn.warning:not(:disabled):hover {
    background-color: #dc2626;
}

.log-panel {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 16px;
}

.log-panel h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.logs {
    background-color: #0f172a;
    border-radius: 8px;
    height: 120px;
    overflow-y: auto;
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.log-entry {
    word-break: break-all;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding-bottom: 4px;
}
.log-entry.tx { color: var(--accent-color); }
.log-entry.rx { color: var(--success-color); }
.log-entry.error { color: var(--danger-color); }