/* Basic Setup */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --input-bg: #f9fafb;
    --border-color: #d1d5db;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    background: var(--card-bg);
    padding: 15px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-weight: 500;
}

input[type="text"], select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--input-bg);
}

.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
}

/* Panel Styles */
.panel {
    flex: 1;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    transition: all 0.3s ease;
}

.panel h2 {
    font-size: 1.25rem;
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 2px solid var(--bg-color);
    padding-bottom: 10px;
}

.content-area {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #4b5563;
}

textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    background: var(--input-bg);
}

.digest-display {
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    padding: 10px;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.85rem;
    word-break: break-all;
    min-height: 40px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

.danger-btn {
    background: var(--danger-color);
    color: white;
}
.danger-btn:hover { background: var(--danger-hover); }

.secondary-btn {
    background: #9ca3af;
    color: white;
}
.secondary-btn:hover { background: #6b7280; }

/* Computer C Specific Styles */
.computer-c {
    border: 2px dashed var(--danger-color);
    background-color: #fff5f5;
    position: relative;
}

.computer-c.disabled {
    opacity: 0.5;
    pointer-events: none;
    filter: grayscale(100%);
}

.status-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--danger-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    display: none;
}

.computer-c:not(.disabled) .status-badge {
    display: block;
}

/* Verification Results */
.result-box {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
}

.result-box.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #34d399;
}

.result-box.failure {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #f87171;
}

.hidden {
    display: none;
}