:root {
    --bg: #f4f7f6;
    --surface: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    --border: #e2e8f0;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #edf2f7;
    --secondary-hover: #e2e8f0;
    --success: #10b981;
    --error: #ef4444;
    --warning-bg: #fffbeb;
    --warning-text: #b45309;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    padding: 40px 20px;
    margin: 0;
}

.container { max-width: 950px; margin: 0 auto; }
header { text-align: center; margin-bottom: 30px; }
h1 { margin: 0 0 8px 0; color: #1a202c; font-size: 2.2rem; }
header p { color: var(--text-muted); font-size: 1.1rem; margin: 0; }

/* Cards & Layout */
.card {
    background: var(--surface);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    margin-bottom: 24px;
    border: 1px solid var(--border);
}
.hidden { display: none !important; }
.mt-20 { margin-top: 20px; }
.divider { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }

/* Inputs & Buttons aligned perfectly */
.input-row, .controls-row { display: flex; align-items: flex-end; gap: 15px; flex-wrap: wrap; }
.input-group { display: flex; flex-direction: column; gap: 6px; }
label { font-weight: 600; font-size: 0.9rem; color: var(--text-main); }

input, select {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s;
    background: #f8fafc;
}
input:focus, select:focus { border-color: var(--primary); outline: none; background: #fff; box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    height: 42px; /* Matches input height */
    display: flex;
    align-items: center;
    justify-content: center;
}
.primary { background: var(--primary); color: white; }
.primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.secondary { background: var(--secondary); color: var(--text-main); border: 1px solid var(--border); }
.secondary:hover { background: var(--secondary-hover); }
.run-btn { margin-left: auto; padding: 10px 30px; } /* Pushes to the right */

/* Mode Toggle */
.mode-toggle { display: flex; gap: 30px; }
.radio-label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-weight: 600; color: var(--primary); font-size: 1.05rem; }
.radio-label input { width: 18px; height: 18px; accent-color: var(--primary); cursor: pointer; }

/* Modern Tables */
.table-wrapper { overflow-x: auto; border-radius: 8px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 14px 20px; border-bottom: 1px solid var(--border); }
th { background: #f8fafc; font-weight: 600; color: var(--text-muted); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }
tbody tr:hover { background: #f8fafc; }
tbody tr:last-child td { border-bottom: none; }

/* Gantt Chart */
.gantt-wrapper { display: flex; height: 60px; border-radius: 8px; overflow: hidden; margin-top: 15px; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06); background: #e2e8f0; }
.gantt-block { display: flex; align-items: center; justify-content: center; position: relative; font-weight: 600; color: #fff; border-right: 1px solid rgba(255,255,255,0.2); transition: filter 0.2s; }
.gantt-block:hover { filter: brightness(0.9); }
.gantt-block:last-child { border-right: none; }
.gantt-block.idle { background: repeating-linear-gradient(45deg, #cbd5e1, #cbd5e1 10px, #e2e8f0 10px, #e2e8f0 20px) !important; color: #475569; font-weight: normal; }
.gantt-time { position: absolute; bottom: -28px; right: 0; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); transform: translateX(50%); }
.start-time { position: absolute; bottom: -28px; left: 0; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); transform: translateX(-50%); }

/* Pure CSS Bar Chart */
.chart-container { display: flex; align-items: flex-end; justify-content: space-around; height: 250px; padding: 20px 10px 40px 10px; border-bottom: 2px solid var(--border); border-left: 2px solid var(--border); margin-top: 20px; }
.bar-wrapper { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; width: 12%; position: relative; }
.bar { width: 100%; background: var(--primary); border-radius: 6px 6px 0 0; transition: height 0.5s ease-out; position: relative; min-height: 2px; }
.bar:hover { background: var(--primary-hover); }
.bar-value { position: absolute; top: -25px; font-weight: bold; font-size: 0.9rem; color: var(--text-main); }
.bar-label { position: absolute; bottom: -35px; text-align: center; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); width: 150%; word-wrap: break-word; }

/* Explanation & Winners */
.explanation-box { background: var(--warning-bg); border-left: 4px solid #f59e0b; padding: 20px; border-radius: 0 8px 8px 0; margin-bottom: 24px; color: var(--warning-text); }
.explanation-box h3 { margin: 0 0 10px 0; color: #92400e; }
.winner-card { background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%); border: 1px solid #a7f3d0; text-align: center; }
.winner-card h2 { color: #065f46; margin: 0 0 10px 0; font-size: 1.8rem; }

/* Badges & Logs */
.header-with-badges { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.badges-container { display: flex; gap: 15px; }
.badge { background: #eff6ff; color: #1e40af; padding: 6px 12px; border-radius: 20px; font-weight: 600; font-size: 0.9rem; border: 1px solid #bfdbfe; }
.log-list { list-style: none; padding: 0; margin: 0; font-family: 'Courier New', monospace; font-size: 0.9rem; max-height: 250px; overflow-y: auto; background: #f8fafc; padding: 15px; border-radius: 8px; border: 1px solid var(--border); }
.log-list li { margin-bottom: 8px; color: #475569; }

/* Error box */
.error-box { background: #fee2e2; border-left: 4px solid var(--error); color: #991b1b; padding: 15px; margin-bottom: 20px; border-radius: 0 8px 8px 0; font-weight: 600; }