:root {
    /* Base Colors */
    --primary-color: #ff9900; /* Rich Gold/Orange for accents */
    --secondary-color: #7d8590; /* Soft gray for secondary text */
    --success-color: #17b978; /* Green */
    --error-color: #e54b4b; /* Red */

    /* Dark Mode Palette */
    --bg-main: #14141c;
    --card-bg: #1c1c24;
    --text-color: #f0f3f5;
    --border-color: #333642;
    --input-bg: #21242c;
    --hover-bg: #272a34;
}

/* Base and Background */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

.calculator-container {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    width: 100%;
    max-width: 500px;
}

/* Headers and Titles */
h1 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.subtitle {
    font-size: 0.85em;
    color: var(--secondary-color);
    margin-bottom: 25px;
    text-transform: uppercase;
    font-weight: 500;
}

h2 {
    font-size: 1.2em;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-top: 30px;
    margin-bottom: 20px;
    font-weight: 600;
}

/* Input Fields */
.input-group {
    margin-bottom: 18px;
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-color);
}

.input-group small {
    display: block;
    color: var(--secondary-color);
    margin-top: 4px;
    font-size: 0.8em;
}

input[type="number"], input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.2s, background-color 0.2s;
}

input[type="number"]:focus, input[type="text"]:focus {
    border-color: var(--primary-color);
    background-color: var(--card-bg);
    outline: none;
}

/* --- Target Price Percentage Buttons (GREEN PLUS / RED MINUS) --- */
.target-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.target-btn-group-minus {
    margin-top: 5px;
}

.target-calc-btn {
    padding: 6px 10px;
    font-size: 0.8em;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    flex-grow: 1;
    min-width: 50px;
    background-color: var(--input-bg);
    transition: all 0.2s;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

/* PLUS Buttons (+): Green */
.target-calc-btn:not(.minus) {
    color: var(--success-color);
    border-color: var(--border-color);
}
.target-calc-btn:not(.minus):hover {
    background-color: var(--success-color);
    color: var(--bg-main);
    border-color: var(--success-color);
}

/* MINUS Buttons (-): Red */
.target-calc-btn.minus {
    color: var(--error-color);
    border-color: var(--border-color);
}
.target-calc-btn.minus:hover {
    background-color: var(--error-color);
    color: var(--text-color);
    border-color: var(--error-color);
}

/* Main Action Buttons */
.button-group {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

button {
    padding: 12px 20px;
    font-size: 1em;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    flex-grow: 1;
    transition: background-color 0.2s;
}

#calculate-btn {
    background-color: var(--primary-color);
    color: var(--bg-main);
}

#calculate-btn:hover {
    background-color: #ffb74d;
}

#reset-btn, #clear-history-btn {
    background-color: var(--border-color);
    color: var(--text-color);
}

#reset-btn:hover, #clear-history-btn:hover {
    background-color: var(--secondary-color);
}

/* Results Summary */
.results-summary {
    padding-top: 15px;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px dashed var(--border-color);
}

.result-item .label {
    font-weight: 500;
    color: var(--secondary-color);
}

.result-item .value {
    font-weight: 700;
    font-size: 1.1em;
}

.direction-long, .history-long { color: var(--success-color); }
.direction-short, .history-short { color: var(--error-color); }

/* Alert Box */
.alert {
    background-color: rgba(229, 75, 75, 0.2);
    color: var(--error-color);
    border: 1px solid var(--error-color);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.alert.hidden { display: none; }

/* Scenario Analysis Table */
.scenario-summary { margin-top: 40px; }
.scenario-table { 
    width: 100%; 
    border-collapse: collapse; 
    margin-top: 15px; 
    font-size: 0.85em; 
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}
.scenario-table th, .scenario-table td { 
    padding: 10px; 
    text-align: left; 
    border-bottom: 1px solid var(--border-color);
}
.scenario-table th { background-color: var(--input-bg); font-weight: 600; }
.scenario-table tr:hover { background-color: var(--hover-bg); }
.placeholder-text { text-align: center; color: var(--secondary-color); padding: 20px; }

/* History Section */
.history-item {
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}
.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
}
.history-header strong { color: var(--primary-color); }
.history-header .coin-name-display { font-weight: 600; font-size: 1.1em; }
.history-details p { color: var(--secondary-color); }
.load-history-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--bg-main);
    padding: 8px;
    margin-top: 15px;
    border-radius: 6px;
    cursor: pointer;
}
.load-history-btn:hover { background-color: #ffb74d; }

/* Pagination */
.pagination-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color);
}
.pagination-btn {
    padding: 8px 12px;
    background-color: var(--primary-color);
    color: var(--bg-main);
    border-radius: 6px;
    font-weight: 600;
}
.pagination-btn:disabled {
    background-color: var(--border-color);
    color: var(--secondary-color);
    cursor: not-allowed;
}
.page-info { font-size: 0.9em; color: var(--secondary-color); }

.theme-toggle label {
    background-color: var(--input-bg);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}
#clear-history-btn { width: 100%; margin-top: 15px; padding: 10px; }