:root {
    --primary-color: #0284c7;
    /* Deep Sky Blue */
    --primary-light: #38bdf8;
    /* Sky Blue 400 */
    --accent-color: #f59e0b;
    /* Amber */
    --success-color: #10b981;
    /* Emerald */
    --danger-color: #ef4444;
    /* Red 500 */
    --text-color: #0f172a;
    /* Slate 900 */
    --text-light: #f1f5f9;
    /* Slate 100 */
    --bg-color: #f0f9ff;
    /* Sky 50 */
    --card-bg: #ffffff;
    --border-color: #e0f2fe;
    /* Sky 100 */
    --header-bg: #e0f2fe;
    /* Sky 100 */
}

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

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

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(41, 128, 185, 0.1);
    border: 1px solid #d4e6f1;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--bg-color);
}

h1 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.controls {
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.btn {
    padding: 15px 40px;
    font-size: 1.2rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn.start {
    background-color: var(--success-color);
    color: white;
}

.btn.start:hover {
    background-color: #219150;
}

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

.btn.stop:hover {
    background-color: #a93226;
}

.btn.secondary {
    background-color: var(--primary-light);
    color: white;
    font-size: 1rem;
    padding: 12px 25px;
    /* Unified padding */
}

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

.btn.danger-outline {
    background-color: transparent;
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
    font-size: 1rem;
    padding: 10px 25px;
    box-shadow: none;
}

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

.hidden {
    display: none;
}

#currentTimer {
    margin-top: 5px;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    background: var(--header-bg);
    padding: 10px 20px;
    border-radius: 8px;
}

.prediction-area {
    margin-bottom: 30px;
    text-align: center;
}

.card {
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    background: white;
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.prediction-text {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 15px 0;
    text-shadow: 1px 1px 0px rgba(0, 0, 0, 0.05);
}

.chart-area {
    margin-bottom: 30px;
    height: 400px;
    background: white;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.table-container {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

/* Data Management Styles */
.data-manage-area {
    margin: 20px 0 30px 0;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    background: #fdfefe;
}

.data-manage-area h3 {
    margin-bottom: 15px;
    color: var(--text-color);
    font-size: 1.1rem;
    opacity: 0.8;
}

.actions-row {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}


table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--header-bg);
    font-weight: 700;
    color: var(--primary-color);
}

tr:last-child td {
    border-bottom: none;
}

tr:nth-child(even) {
    background-color: #fafbfd;
}

td .delete-btn {
    color: var(--danger-color);
    cursor: pointer;
    background: none;
    border: none;
    font-weight: 600;
    transition: color 0.2s;
}

td .delete-btn:hover {
    color: #922b21;
    text-decoration: underline;
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    .btn {
        width: 100%;
    }

    .actions-row {
        flex-direction: column;
    }
}