/* SRM CGPA Calculator — Styles */

.srm-cgpa-wrapper {
    --srm-teal: #14b8a6;
    --srm-teal-dark: #0d9488;
    --srm-bg: #f4f6f8;
    --srm-card-bg: #ffffff;
    --srm-border: #e2e8f0;
    --srm-text-dark: #1e293b;
    --srm-text-muted: #64748b;
    --srm-radius: 12px;

    max-width: 720px;
    margin: 0 auto;
    padding: 32px 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    box-sizing: border-box;
}

.srm-cgpa-wrapper *,
.srm-cgpa-wrapper *::before,
.srm-cgpa-wrapper *::after {
    box-sizing: border-box;
}

.srm-cgpa-header {
    text-align: center;
    margin-bottom: 28px;
}

.srm-cgpa-title {
    font-size: 30px;
    font-weight: 800;
    color: var(--srm-text-dark);
    margin: 0 0 12px 0;
}

.srm-cgpa-subtitle {
    font-size: 15px;
    line-height: 1.6;
    color: var(--srm-text-muted);
    margin: 0 auto;
    max-width: 560px;
}

.srm-cgpa-card {
    background: var(--srm-card-bg);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
    border: 1px solid var(--srm-border);
}

/* Table head labels (desktop) */
.srm-cgpa-table-head {
    display: grid;
    grid-template-columns: 2fr 1fr 1.6fr 36px;
    gap: 12px;
    padding: 0 4px 8px 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--srm-text-dark);
}

.srm-info {
    color: #94a3b8;
    cursor: help;
    font-size: 12px;
}

.srm-cgpa-rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.srm-cgpa-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1.6fr 36px;
    gap: 12px;
    align-items: center;
}

.srm-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--srm-border);
    border-radius: 10px;
    font-size: 14px;
    color: var(--srm-text-dark);
    background: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    height: 46px;
}

.srm-input:focus {
    outline: none;
    border-color: var(--srm-teal);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.15);
}

select.srm-input {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath fill='%2364748b' d='M0 0l6 8 6-8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 34px;
    cursor: pointer;
}

.srm-remove-row {
    width: 36px;
    height: 36px;
    border: none;
    background: #fee2e2;
    color: #dc2626;
    border-radius: 8px;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s ease;
}

.srm-remove-row:hover {
    background: #fecaca;
}

.srm-cgpa-rows .srm-cgpa-row:only-child .srm-remove-row {
    opacity: 0.4;
    pointer-events: none;
}

.srm-add-subject-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #ecfdf9;
    color: var(--srm-teal-dark);
    border: 1px dashed var(--srm-teal);
    border-radius: 10px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 24px;
    transition: background 0.15s ease;
}

.srm-add-subject-btn:hover {
    background: #d1faf2;
}

.srm-plus {
    font-size: 16px;
    font-weight: 800;
}

.srm-cgpa-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.srm-btn {
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.15s ease;
}

.srm-btn-primary {
    background: var(--srm-teal);
    color: #fff;
    border-color: var(--srm-teal);
}

.srm-btn-primary:hover {
    background: var(--srm-teal-dark);
    border-color: var(--srm-teal-dark);
}

.srm-btn-secondary {
    background: #fff;
    color: var(--srm-teal-dark);
    border-color: var(--srm-teal);
}

.srm-btn-secondary:hover {
    background: #ecfdf9;
}

.srm-cgpa-result {
    margin-top: 22px;
    background: linear-gradient(135deg, #0f766e, #14b8a6);
    border-radius: 12px;
    padding: 22px;
    text-align: center;
    animation: srmFadeIn 0.3s ease;
}

@keyframes srmFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.srm-result-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.85);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.srm-result-value {
    display: block;
    font-size: 42px;
    font-weight: 800;
    color: #fff;
}

.srm-cgpa-error {
    margin-top: 16px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #b91c1c;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
}

/* Responsive: stack rows on small screens */
@media (max-width: 640px) {
    .srm-cgpa-table-head {
        display: none;
    }

    .srm-cgpa-row {
        grid-template-columns: 1fr;
        grid-template-areas:
            "subject"
            "credit"
            "grade"
            "remove";
        background: #f8fafc;
        border: 1px solid var(--srm-border);
        border-radius: 10px;
        padding: 12px;
        position: relative;
    }

    .srm-remove-row {
        position: absolute;
        top: 10px;
        right: 10px;
        width: 30px;
        height: 30px;
    }

    .srm-cgpa-actions {
        grid-template-columns: 1fr;
    }

    .srm-cgpa-title {
        font-size: 24px;
    }

    .srm-result-value {
        font-size: 34px;
    }
}