:root {
    --bg:
        radial-gradient(circle at top left, rgba(88, 238, 255, 0.2), transparent 30%),
        linear-gradient(180deg, #020611 0%, #071224 100%);
    --surface: rgba(8, 18, 36, 0.84);
    --surface-2: rgba(12, 26, 52, 0.9);
    --border: rgba(120, 235, 255, 0.22);
    --text: #f4f8ff;
    --muted: rgba(214, 228, 255, 0.74);
    --accent: #58eeff;
    --accent-2: #8e63ff;
    --danger: #ff7d96;
}

:root[data-theme="light"] {
    --bg:
        radial-gradient(circle at top left, rgba(31, 165, 255, 0.18), transparent 30%),
        linear-gradient(180deg, #f8fcff 0%, #ebf2ff 100%);
    --surface: rgba(255, 255, 255, 0.92);
    --surface-2: rgba(245, 250, 255, 0.96);
    --border: rgba(48, 120, 218, 0.2);
    --text: #112240;
    --muted: rgba(17, 34, 64, 0.72);
    --accent: #1fa5ff;
    --accent-2: #5f49ff;
    --danger: #e35d77;
}

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

body {
    font-family: "Space Grotesk", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 24px 58px rgba(22, 148, 210, 0.16);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--accent) 0%, #7d9cff 50%, var(--accent-2) 100%);
    color: #04111f;
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.content {
    padding: 40px;
}

section {
    margin-bottom: 40px;
}

h2 {
    color: var(--text);
    margin-bottom: 20px;
    font-size: 1.8em;
    border-bottom: 3px solid var(--accent);
    padding-bottom: 10px;
}

/* Mode Selector */
.mode-selector {
    display: flex;
    align-items: center;
    gap: 30px;
}

.mode-selector label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1em;
    cursor: pointer;
}

.mode-selector input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.info {
    background: rgba(255, 255, 255, 0.04);
    padding: 15px;
    border-radius: 8px;
    color: var(--text);
    margin-top: 10px;
    border-left: 4px solid var(--accent);
}

/* Investment Options */
.investment-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.investment-card {
    background: var(--surface-2);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.investment-card:hover {
    border-color: var(--accent);
    background: rgba(88, 238, 255, 0.08);
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(88, 238, 255, 0.18);
}

.investment-card input[type="checkbox"],
.investment-card input[type="radio"] {
    margin-right: 10px;
    cursor: pointer;
}

.investment-card label {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.investment-card.selected {
    background: linear-gradient(135deg, var(--accent), #7d9cff, var(--accent-2));
    color: #04111f;
    border-color: transparent;
}

.reset-btn {
    background: linear-gradient(135deg, var(--danger), #ffb061);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s ease;
    margin-top: 15px;
}

.reset-btn:hover {
    background: linear-gradient(135deg, #ff6f8f, #ff9d5b);
    transform: scale(1.05);
}

/* Metrics */
.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.metric-card {
    background: linear-gradient(135deg, rgba(8, 18, 36, 0.95) 0%, rgba(13, 30, 59, 0.95) 100%);
    color: var(--text);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 10px 28px rgba(88, 238, 255, 0.14);
}

.metric-card h3 {
    font-size: 0.95em;
    opacity: 0.9;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.metric-card .value {
    font-size: 2em;
    font-weight: bold;
}

/* Transactions Table */
.transactions-table {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border-radius: 10px;
    overflow: hidden;
}

table thead {
    background: linear-gradient(135deg, rgba(8, 18, 36, 0.95), rgba(13, 30, 59, 0.95));
    color: var(--text);
}

table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 15px;
    border-bottom: 1px solid var(--border);
}

table tbody tr:hover {
    background: rgba(88, 238, 255, 0.06);
}

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

.remove-btn {
    background: linear-gradient(135deg, var(--danger), #ffb061);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.remove-btn:hover {
    background: linear-gradient(135deg, #ff6f8f, #ff9d5b);
    transform: scale(1.05);
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.04);
    padding: 20px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .content {
        padding: 20px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .investment-options {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .metrics {
        grid-template-columns: 1fr;
    }

    .mode-selector {
        flex-direction: column;
        align-items: flex-start;
    }
}