/* --- Root Variables --- */
:root {
    --bg-color: #ddebff;
    --card-bg: #ffffff;
    --primary-text: #2c3e50;
    --secondary-text: #5a6b82;
    --border-color: #e6eaf0;
    --primary-blue: #3498db;
    --safe-green: #2ecc71;
    --warn-yellow: #f1c40f;
    --danger-red: #e74c3c;
    --projected-purple: #9b59b6;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

/* --- Global Reset & Box Model Fixes --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* --- General Tool Styling --- */
#attendance-calculator-tool {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    padding: 2rem;
    border-radius: 16px;
    width: 100%;
    max-width: 700px;
    margin: 1rem auto;
    box-shadow: var(--shadow);
    color: var(--primary-text);
}

.hidden {
    display: none !important;
}

/* --- Form & Inputs --- */
#attendance-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .input-section {
        grid-template-columns: 1fr 1fr;
    }
}

fieldset {
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 12px;
    background: var(--card-bg);
    margin: 0;
}

legend {
    font-weight: 600;
    padding: 0 0.5rem;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.2rem;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-wrapper {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

label {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--secondary-text);
}

input[type="number"] {
    flex-grow: 1;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 1rem;
    transition: all 0.2s ease-in-out;
    width: 100%;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 20px;
    height: 20px;
    background-color: var(--border-color);
    color: var(--secondary-text);
    border-radius: 50%;
    cursor: help;
    font-size: 0.8rem;
    font-weight: bold;
    margin-left: 0.5rem;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-text);
    color: white;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
    z-index: 10;
}

.tooltip:hover::before {
    opacity: 1;
    visibility: visible;
}

/* Buttons */
#calculate-btn, #save-result-btn {
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(45deg, #3498db, #2980b9);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
    width: 100%;
}

#calculate-btn:disabled, #save-result-btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

#calculate-btn:hover, #save-result-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(52, 152, 219, 0.4);
}

/* --- Results Section --- */
#results-wrapper {
    margin-top: 2rem;
    animation: fadeIn 0.5s ease-in-out;
}

#results-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

/* Main Metrics & Chart */
.results-title {
    text-align: center;
    color: var(--primary-text);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.main-metrics {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    max-width: 100%;
    overflow-x: auto;
}

.chart-container {
    flex-basis: 200px;
    flex-shrink: 0;
    max-width: 100%;
}

@property --p {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

.donut-chart {
  --w: 160px;
  --c-safe: var(--safe-green);
  --c-warn: var(--warn-yellow);
  --c-danger: var(--danger-red);
  --b: 18px;
  width: var(--w);
  aspect-ratio: 1;
  position: relative;
  display: inline-grid;
  place-content: center;
  margin: 5px auto;
  font-size: 1.5em;
  font-weight: bold;
  transition: --p 0.5s ease-in-out;
  animation: p 1s 1 forwards;
}

.donut-chart.safe { --c-theme: var(--c-safe); }
.donut-chart.warn { --c-theme: var(--c-warn); }
.donut-chart.danger { --c-theme: var(--c-danger); }

.donut-chart:before {
  content: "";
  position: absolute;
  border-radius: 50%;
  inset: 0;
  background: conic-gradient(var(--c-theme) calc(var(--p) * 1%), var(--border-color) 0);
  -webkit-mask: radial-gradient(farthest-side, #0000 calc(99% - var(--b)), #000 calc(100% - var(--b)));
  mask: radial-gradient(farthest-side, #0000 calc(99% - var(--b)), #000 calc(100% - var(--b)));
}

#chart-percentage {
    font-size: 2.2rem;
}

.chart-label {
    font-weight: 500;
    color: var(--secondary-text);
    margin-top: 0.5rem;
}

/* KPIs */
.kpi-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
    width: 100%;
}

.kpi-box {
    padding: 1.2rem;
    border-radius: 10px;
    text-align: left;
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 100%;
}

.kpi-box.safe { border-left: 5px solid var(--safe-green); background: #f0fdf4; }
.kpi-box.projected { border-left: 5px solid var(--projected-purple); background: #fbf5ff; }

.kpi-title {
    font-weight: 500;
    color: var(--secondary-text);
    font-size: 0.9rem;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
}

.kpi-box.safe .kpi-value { color: var(--safe-green); }
.kpi-box.projected .kpi-value { color: var(--projected-purple); }

.kpi-desc {
    font-size: 0.85rem;
    color: var(--secondary-text);
}

/* Insight Cards */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.insight-card {
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.insight-title {
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.insight-value {
    font-size: 1rem;
    margin: 0;
}

.insight-value strong {
    font-size: 1.5rem;
    font-weight: 700;
}

#bunk-card { background-color: #f0fdf4; border-color: #a7f3d0; }
#bunk-card strong { color: var(--safe-green); }

#attend-card { background-color: #fffbeb; border-color: #fde68a; }
#attend-card strong { color: var(--warn-yellow); }

#status-card { background-color: #eff6ff; border-color: #bfdbfe;}
#status-card strong { color: var(--primary-blue); }

#status-verdict.safe { color: var(--safe-green); }
#status-verdict.warn { color: var(--warn-yellow); }
#status-verdict.danger { color: var(--danger-red); }

/* Summary Details */
.summary-details {
    margin-top: 1rem;
    padding: 1.5rem;
    background: #fafafa;
    border-radius: 8px;
    border: 1px dashed var(--border-color);
    overflow-x: auto;
}

.summary-details ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.summary-details li {
    font-size: 0.95rem;
}

#error-box {
    background-color: #fff1f2;
    color: var(--danger-red);
    border: 1px solid var(--danger-red);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    text-align: center;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}