@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Lora:wght@400;500&family=Space+Mono:wght@400;700&display=swap');

:root {
    --navy: #0F1F3D;
    --navy-light: #1A2F55;
    --teal: #0D9488;
    --teal-light: #CCFBF1;
    --amber: #D97706;
    --bg: #F4F6FB;
    --bg2: #EEF1F9;
    --white: #FFFFFF;
    --text: #1E2A3A;
    --text2: #4A5568;
    --text3: #718096;
    --border: #D8DEE9;
    --serif: 'Playfair Display', Georgia, serif;
    --body: 'Lora', Georgia, serif;
    --mono: 'Space Mono', monospace;
}

.wc-wrapper {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    max-width: 680px;
    font-family: var(--body);
    margin: 0 auto;
    box-sizing: border-box;
}

/* Animated wave header */
.wc-wave-header {
    background: linear-gradient(135deg, #0F1F3D, #1A3A5C);
    height: 80px;
    border-radius: 10px 10px 0 0;
    overflow: hidden;
    position: relative;
}

.wc-wave-svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* Body */
.wc-body {
    padding: 28px;
}

.wc-label {
    font-family: var(--mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--teal);
    margin: 0 0 8px 0;
}

.wc-title {
    font-family: var(--serif);
    font-size: 28px;
    font-weight: 700;
    color: var(--navy);
    margin: 0 0 6px 0;
}

.wc-subtitle {
    font-family: var(--body);
    font-size: 14px;
    color: var(--text3);
    margin: 0 0 20px 0;
}

.wc-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.wc-tab {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 18px;
    cursor: pointer;
    font-family: var(--mono);
    font-size: 11px;
    background: var(--bg);
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.wc-tab-active {
    background: var(--navy);
    color: var(--white);
    border-color: var(--navy);
}

.wc-field-group {
    margin-bottom: 18px;
}

.wc-field-label {
    display: block;
    font-family: var(--mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text2);
    margin-bottom: 6px;
}

.wc-select,
.wc-input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
    font-family: var(--body);
    font-size: 14px;
    background: var(--bg);
    color: var(--text);
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s;
}

.wc-select:focus,
.wc-input:focus {
    border-color: var(--teal);
}

.wc-inputs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 20px;
}

@media (max-width: 480px) {
    .wc-inputs-grid { grid-template-columns: 1fr; }
}

.wc-btn-row {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.wc-btn-primary {
    background: var(--teal);
    color: var(--white);
    font-family: var(--mono);
    font-size: 13px;
    padding: 12px 24px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.wc-btn-primary:hover { background: #0b7a70; }

.wc-btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text2);
    font-family: var(--mono);
    font-size: 13px;
    padding: 12px 24px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}

.wc-btn-secondary:hover { border-color: var(--text2); color: var(--navy); }

.wc-error {
    background: #FEE2E2;
    border: 1px solid #FECACA;
    border-radius: 8px;
    padding: 12px 16px;
    color: #DC2626;
    font-family: var(--body);
    font-size: 14px;
    margin-bottom: 16px;
}

.wc-result-box {
    background: linear-gradient(135deg, #0F1F3D, #1A2F55);
    border-radius: 10px;
    padding: 20px;
    color: var(--white);
    font-family: var(--mono);
    margin-bottom: 12px;
}

.wc-result-label {
    font-size: 10px;
    color: #5EEAD4;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 6px;
}

.wc-result-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.wc-formula-used {
    font-size: 12px;
    color: #94A3B8;
}

/* Secondary cards */
.wc-secondary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

@media (max-width: 480px) {
    .wc-secondary-grid { grid-template-columns: 1fr; }
}

.wc-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.wc-card-label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--teal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.wc-card-value {
    font-family: var(--mono);
    font-size: 16px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 2px;
    word-break: break-all;
}

.wc-card-unit {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text3);
}

/* Steps */
.wc-steps {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    font-size: 13.5px;
    color: var(--text2);
    font-family: var(--body);
    margin-bottom: 16px;
}

.wc-steps-title {
    font-family: var(--mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--teal);
    margin-bottom: 12px;
}

.wc-step-item {
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    line-height: 1.6;
}

.wc-step-item:last-child { border-bottom: none; }

/* Reference panel */
.wc-ref-panel {
    background: var(--bg2);
    border-radius: 8px;
    padding: 14px;
}

.wc-ref-title {
    font-family: var(--mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--teal);
    margin-bottom: 10px;
}

.wc-ref-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--mono);
    font-size: 12px;
}

.wc-ref-table th {
    background: var(--teal);
    color: var(--white);
    padding: 8px 10px;
    text-align: left;
    font-weight: 700;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.wc-ref-table td {
    padding: 7px 10px;
    border-bottom: 1px solid var(--border);
    color: var(--text2);
}

.wc-ref-table tr:last-child td { border-bottom: none; }