/* ================================================================
   GPA-CALCULATOR.CSS  —  Premium Bangladesh SSC / HSC GPA Calculator
   ================================================================ */

/* ══════════════════════════════════════════════════════════════════
   MODE TOGGLE
══════════════════════════════════════════════════════════════════ */
.gpa-mode-toggle {
    display: inline-flex;
    background: var(--primary-light);
    border-radius: 50px;
    padding: 4px;
    gap: 4px;
    margin-bottom: 2rem;
}

.gpa-mode-toggle input[type="radio"] { display: none; }

.gpa-mode-toggle label {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .55rem 1.6rem;
    border-radius: 50px;
    font-size: .92rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), box-shadow var(--transition);
    user-select: none;
}

.gpa-mode-toggle input[type="radio"]:checked + label {
    background: var(--grad-hero);
    color: #fff;
    box-shadow: 0 4px 14px rgba(79,70,229,.30);
}

/* ══════════════════════════════════════════════════════════════════
   RESULT SHEET TABLE
══════════════════════════════════════════════════════════════════ */
.gpa-sheet-wrap {
    max-width: 860px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.gpa-sheet-header {
    background: var(--grad-hero);
    color: #fff;
    padding: 1.2rem 1.8rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .8rem;
}

.gpa-sheet-header-title {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    opacity: .95;
}

.gpa-sheet-header-mode {
    font-size: .82rem;
    font-weight: 600;
    background: rgba(255,255,255,.18);
    padding: .3rem .85rem;
    border-radius: 50px;
    letter-spacing: .05em;
}

.gpa-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.gpa-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .95rem;
}

.gpa-table thead th {
    background: #f1f5ff;
    color: var(--text-soft);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    padding: .85rem 1.1rem;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.gpa-table tbody tr {
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.gpa-table tbody tr:last-child { border-bottom: none; }
.gpa-table tbody tr:nth-child(even) { background: #fafbff; }
.gpa-table tbody tr:hover { background: #f0f4ff; }
.gpa-table tbody tr.gpa-row--fail { background: #fff5f5 !important; }
.gpa-table tbody tr.gpa-row--fail td { color: #dc2626; }
.gpa-table tbody tr.gpa-row--fail .gpa-grade-badge { background: #fee2e2; color: #b91c1c; }

.gpa-table td {
    padding: .85rem 1.1rem;
    vertical-align: middle;
    color: var(--text-soft);
}

/* Subject name cell */
.gpa-subject-cell {
    min-width: 160px;
}

.gpa-subject-input {
    width: 100%;
    border: 1.5px solid transparent;
    border-radius: var(--radius-sm);
    padding: .48rem .75rem;
    font-size: .93rem;
    font-family: inherit;
    font-weight: 600;
    color: var(--text);
    background: transparent;
    transition: border-color var(--transition), background var(--transition);
    outline: none;
}

.gpa-subject-input:focus {
    border-color: var(--primary);
    background: #f5f7ff;
}

/* Marks cell */
.gpa-marks-cell { min-width: 110px; }

.gpa-marks-input {
    width: 90px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .5rem .75rem;
    font-size: .97rem;
    font-family: inherit;
    font-weight: 700;
    color: var(--text);
    background: #fff;
    text-align: center;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    -moz-appearance: textfield;
}

.gpa-marks-input::-webkit-outer-spin-button,
.gpa-marks-input::-webkit-inner-spin-button { -webkit-appearance: none; }

.gpa-marks-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,.12);
}

.gpa-marks-input.gpa-input--invalid {
    border-color: #f87171;
    background: #fff5f5;
}

/* Grade badge */
.gpa-grade-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
    padding: .32rem .75rem;
    border-radius: 50px;
    font-size: .85rem;
    font-weight: 700;
    background: #eef2ff;
    color: var(--primary);
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
}

.gpa-grade-badge--aplus  { background: #dcfce7; color: #15803d; }
.gpa-grade-badge--a      { background: #d1fae5; color: #065f46; }
.gpa-grade-badge--aminus { background: #ecfdf5; color: #047857; }
.gpa-grade-badge--b      { background: #eff6ff; color: #1d4ed8; }
.gpa-grade-badge--c      { background: #fef9c3; color: #854d0e; }
.gpa-grade-badge--d      { background: #fff7ed; color: #c2410c; }
.gpa-grade-badge--f      { background: #fee2e2; color: #b91c1c; }
.gpa-grade-badge--empty  { background: #f1f5f9; color: #94a3b8; }

/* Grade point cell */
.gpa-point-cell {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 80px;
    text-align: center;
}

.gpa-point-cell span { transition: opacity .2s; }

/* Optional badge */
.gpa-optional-badge {
    display: inline-block;
    font-size: .68rem;
    font-weight: 700;
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
    border-radius: 50px;
    padding: .1rem .5rem;
    margin-left: .4rem;
    vertical-align: middle;
}

/* Remove row button */
.gpa-remove-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: none;
    background: transparent;
    color: #94a3b8;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    transition: background var(--transition), color var(--transition);
    flex-shrink: 0;
}

.gpa-remove-btn:hover {
    background: #fee2e2;
    color: #dc2626;
}

/* ══════════════════════════════════════════════════════════════════
   TABLE FOOTER (add row + action buttons)
══════════════════════════════════════════════════════════════════ */
.gpa-sheet-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .8rem;
    padding: 1.1rem 1.4rem;
    border-top: 1px solid var(--border);
    background: #fafbff;
}

.gpa-add-row-btn {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    background: transparent;
    border: 1.5px dashed var(--primary);
    color: var(--primary);
    font-size: .87rem;
    font-weight: 600;
    padding: .48rem 1.1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition);
}

.gpa-add-row-btn:hover { background: var(--primary-light); }

.gpa-sheet-actions {
    display: flex;
    gap: .6rem;
    flex-wrap: wrap;
}

.btn-gpa-secondary {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    background: #fff;
    border: 1.5px solid var(--border);
    color: var(--text-soft);
    font-size: .87rem;
    font-weight: 600;
    padding: .5rem 1.1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}

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

/* ══════════════════════════════════════════════════════════════════
   CALCULATE BUTTON
══════════════════════════════════════════════════════════════════ */
.btn-gpa-calculate {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    width: 100%;
    max-width: 340px;
    margin: 2rem auto 0;
    padding: 1rem 2rem;
    font-size: 1.05rem;
    font-weight: 700;
    color: #fff;
    background: var(--grad-hero);
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    box-shadow: 0 6px 22px rgba(79,70,229,.32);
    transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
    letter-spacing: .02em;
}

.btn-gpa-calculate:hover {
    opacity: .92;
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(79,70,229,.38);
}

.btn-gpa-calculate:active { transform: translateY(0); }

/* ══════════════════════════════════════════════════════════════════
   RESULT CARD
══════════════════════════════════════════════════════════════════ */
.gpa-result-card {
    max-width: 860px;
    margin: 2rem auto 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: gpaFadeIn .4s cubic-bezier(.4,0,.2,1);
}

@keyframes gpaFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.gpa-result-hero {
    background: var(--grad-hero);
    color: #fff;
    padding: 2.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    text-align: center;
}

.gpa-result-score-block {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.gpa-result-gpa-label {
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    opacity: .75;
    margin-bottom: .3rem;
}

.gpa-result-gpa-value {
    font-size: clamp(3.5rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -2px;
}

.gpa-result-divider-v {
    width: 1px;
    height: 80px;
    background: rgba(255,255,255,.25);
}

.gpa-result-meta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .8rem;
}

.gpa-result-grade-badge {
    font-size: 2rem;
    font-weight: 900;
    background: rgba(255,255,255,.18);
    padding: .3rem 1.2rem;
    border-radius: 50px;
    letter-spacing: -.5px;
}

.gpa-result-status {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: .95rem;
    font-weight: 700;
    padding: .4rem 1.2rem;
    border-radius: 50px;
    letter-spacing: .02em;
}

.gpa-result-status--pass {
    background: rgba(16,185,129,.25);
    color: #fff;
    border: 1.5px solid rgba(16,185,129,.5);
}

.gpa-result-status--fail {
    background: rgba(239,68,68,.25);
    color: #fff;
    border: 1.5px solid rgba(239,68,68,.5);
}

/* ══════════════════════════════════════════════════════════════════
   BREAKDOWN SECTION
══════════════════════════════════════════════════════════════════ */
.gpa-breakdown {
    padding: 1.8rem;
}

.gpa-breakdown-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.gpa-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
    margin-bottom: 1.4rem;
}

.gpa-breakdown-table thead th {
    background: #f8faff;
    color: var(--text-muted);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    padding: .65rem .9rem;
    border-bottom: 1.5px solid var(--border);
    text-align: left;
}

.gpa-breakdown-table tbody td {
    padding: .7rem .9rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-soft);
}

.gpa-breakdown-table tbody tr:last-child td { border-bottom: none; }
.gpa-breakdown-table tbody tr.bd-row--fail td { color: #dc2626; background: #fff5f5; }

.gpa-formula-box {
    background: linear-gradient(135deg, #f0f4ff, #f7f9ff);
    border: 1px solid #dde5ff;
    border-radius: var(--radius);
    padding: 1.1rem 1.4rem;
    font-size: .92rem;
    color: var(--text-soft);
    line-height: 1.7;
}

.gpa-formula-box strong { color: var(--primary); font-size: 1rem; }

.gpa-formula-equation {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: .5rem;
    font-family: 'Courier New', monospace;
}

/* ══════════════════════════════════════════════════════════════════
   SEO GRADING TABLE
══════════════════════════════════════════════════════════════════ */
.gpa-grading-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
    margin-top: 1rem;
}

.gpa-grading-table th {
    background: #f1f5ff;
    color: var(--text-soft);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    padding: .7rem 1rem;
    border-bottom: 2px solid var(--border);
    text-align: left;
}

.gpa-grading-table td {
    padding: .65rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-soft);
}

.gpa-grading-table tr:last-child td { border-bottom: none; }
.gpa-grading-table tr:nth-child(even) td { background: #fafbff; }

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════════════ */
@media (max-width: 600px) {
    .gpa-result-divider-v { display: none; }
    .gpa-result-hero { gap: 1.2rem; }
    .gpa-sheet-footer { flex-direction: column; align-items: flex-start; }
    .gpa-breakdown { padding: 1.2rem 1rem; }
    .gpa-table td, .gpa-table thead th { padding: .65rem .7rem; }
    .gpa-marks-input { width: 70px; }
}