/* ═══════════════════════════════════════════════════════
   Grade Calculator Pro — Stylesheet
   Design: deep navy + electric violet + mint accent
   Typeface: system-ui for body, 'Sora' (Google) for headers
═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700&display=swap');

/* ── TOKENS ── */
:root {
    --gcp-bg:         #0F1117;
    --gcp-surface:    #181C27;
    --gcp-surface-2:  #1E2336;
    --gcp-border:     #2A3050;
    --gcp-violet:     #6C63FF;
    --gcp-violet-lt:  #8B85FF;
    --gcp-mint:       #48C9B0;
    --gcp-gold:       #F5C518;
    --gcp-red:        #FF5C6A;
    --gcp-text:       #E8EAF6;
    --gcp-muted:      #8892B0;
    --gcp-radius:     14px;
    --gcp-radius-sm:  8px;
    --gcp-shadow:     0 8px 40px rgba(0,0,0,.45);
    --gcp-font:       'Sora', system-ui, -apple-system, sans-serif;
    --gcp-pass:       #48C9B0;
    --gcp-fail:       #FF5C6A;
}

/* ── WRAP ── */
.gcp-wrap {
    font-family: var(--gcp-font);
    background: var(--gcp-bg);
    border-radius: var(--gcp-radius);
    box-shadow: var(--gcp-shadow);
    padding: 0;
    overflow: hidden;
    max-width: 860px;
    margin: 32px auto;
    color: var(--gcp-text);
    border: 1px solid var(--gcp-border);
}

/* ── HEADER ── */
.gcp-header {
    background: linear-gradient(135deg, #12162B 0%, #1A1F38 60%, #0D1020 100%);
    padding: 32px 36px 28px;
    display: flex;
    align-items: center;
    gap: 18px;
    border-bottom: 1px solid var(--gcp-border);
    position: relative;
    overflow: hidden;
}
.gcp-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(108,99,255,.12) 0%, transparent 70%);
    pointer-events: none;
}
.gcp-header__icon svg {
    width: 48px;
    height: 48px;
    filter: drop-shadow(0 4px 12px rgba(108,99,255,.4));
}
.gcp-header__title {
    margin: 0 0 4px;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -.3px;
    color: #fff;
}
.gcp-header__sub {
    margin: 0;
    font-size: .78rem;
    color: var(--gcp-muted);
    letter-spacing: .4px;
    text-transform: uppercase;
}

/* ── TABS ── */
.gcp-tabs {
    display: flex;
    background: var(--gcp-surface);
    border-bottom: 1px solid var(--gcp-border);
    padding: 0 24px;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
}
.gcp-tabs::-webkit-scrollbar { display: none; }

.gcp-tab {
    background: transparent;
    border: none;
    color: var(--gcp-muted);
    font-family: var(--gcp-font);
    font-size: .85rem;
    font-weight: 500;
    padding: 16px 18px 14px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color .2s, border-color .2s;
    white-space: nowrap;
}
.gcp-tab:hover { color: var(--gcp-text); }
.gcp-tab--active {
    color: var(--gcp-violet-lt);
    border-bottom-color: var(--gcp-violet);
}

/* ── PANELS ── */
.gcp-panel {
    display: none;
    padding: 28px 32px 24px;
}
.gcp-panel--active { display: block; }

.gcp-panel__desc {
    color: var(--gcp-muted);
    font-size: .86rem;
    margin: 0 0 22px;
    line-height: 1.6;
}

/* ── TABLE ── */
.gcp-table-wrap {
    overflow-x: auto;
    border-radius: var(--gcp-radius-sm);
    border: 1px solid var(--gcp-border);
    margin-bottom: 18px;
}
.gcp-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .875rem;
}
.gcp-table thead tr {
    background: var(--gcp-surface-2);
}
.gcp-table th {
    text-align: left;
    padding: 12px 14px;
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--gcp-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--gcp-border);
}
.gcp-table td {
    padding: 8px 10px;
    border-bottom: 1px solid rgba(42,48,80,.6);
    vertical-align: middle;
}
.gcp-table tbody tr:last-child td { border-bottom: none; }
.gcp-table tbody tr:hover { background: rgba(108,99,255,.05); }

/* ── INPUTS ── */
.gcp-input,
.gcp-select {
    width: 100%;
    background: var(--gcp-surface-2);
    border: 1px solid var(--gcp-border);
    border-radius: var(--gcp-radius-sm);
    color: var(--gcp-text);
    font-family: var(--gcp-font);
    font-size: .875rem;
    padding: 8px 11px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    box-sizing: border-box;
}
.gcp-input:focus,
.gcp-select:focus {
    border-color: var(--gcp-violet);
    box-shadow: 0 0 0 3px rgba(108,99,255,.2);
}
.gcp-input::placeholder { color: #3D4668; }
.gcp-select option { background: var(--gcp-surface-2); }
.gcp-textarea {
    width: 100%;
    background: var(--gcp-surface-2);
    border: 1px solid var(--gcp-border);
    border-radius: var(--gcp-radius-sm);
    color: var(--gcp-text);
    font-family: var(--gcp-font);
    font-size: .875rem;
    padding: 12px 14px;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
    transition: border-color .2s, box-shadow .2s;
    margin-bottom: 18px;
}
.gcp-textarea:focus {
    border-color: var(--gcp-violet);
    box-shadow: 0 0 0 3px rgba(108,99,255,.2);
}
.gcp-textarea::placeholder { color: #3D4668; }

/* ── LABELS ── */
.gcp-label {
    display: block;
    font-size: .75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--gcp-muted);
    margin-bottom: 7px;
}

/* ── FIELD LAYOUT ── */
.gcp-field { margin-bottom: 18px; }
.gcp-grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 8px;
}
.gcp-row-inline {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}
.gcp-row-inline .gcp-field { flex: 1; min-width: 150px; }

.gcp-field--inline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
    align-items: end;
    margin-bottom: 18px;
}
.gcp-field--inline .gcp-label { margin-top: 12px; }

/* ── BUTTONS ── */
.gcp-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 8px;
    margin-bottom: 20px;
}
.gcp-btn {
    font-family: var(--gcp-font);
    font-size: .85rem;
    font-weight: 600;
    padding: 10px 22px;
    border-radius: var(--gcp-radius-sm);
    border: none;
    cursor: pointer;
    transition: all .18s;
    letter-spacing: .2px;
}
.gcp-btn--primary {
    background: var(--gcp-violet);
    color: #fff;
    box-shadow: 0 4px 18px rgba(108,99,255,.35);
}
.gcp-btn--primary:hover {
    background: var(--gcp-violet-lt);
    box-shadow: 0 6px 24px rgba(108,99,255,.5);
    transform: translateY(-1px);
}
.gcp-btn--ghost {
    background: transparent;
    color: var(--gcp-muted);
    border: 1px solid var(--gcp-border);
}
.gcp-btn--ghost:hover {
    color: var(--gcp-text);
    border-color: var(--gcp-violet);
}
.gcp-btn-remove {
    background: transparent;
    border: none;
    color: #3D4668;
    cursor: pointer;
    font-size: 1rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color .15s, background .15s;
    line-height: 1;
}
.gcp-btn-remove:hover {
    color: var(--gcp-red);
    background: rgba(255,92,106,.1);
}

/* ── RESULT AREA ── */
.gcp-result-area {
    border-radius: var(--gcp-radius);
    background: var(--gcp-surface-2);
    border: 1px solid var(--gcp-border);
    padding: 24px 28px;
    margin-top: 4px;
    animation: gcpFadeIn .3s ease;
}
@keyframes gcpFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Big number display */
.gcp-score-display {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.gcp-score-number {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -1px;
}
.gcp-score-number--pass  { color: var(--gcp-mint); }
.gcp-score-number--fail  { color: var(--gcp-red); }
.gcp-score-number--neutral { color: var(--gcp-violet-lt); }

.gcp-score-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-bottom: 4px;
}
.gcp-score-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: .8rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    letter-spacing: .3px;
}
.gcp-score-badge--pass { background: rgba(72,201,176,.15); color: var(--gcp-mint); border: 1px solid rgba(72,201,176,.3); }
.gcp-score-badge--fail { background: rgba(255,92,106,.12); color: var(--gcp-red); border: 1px solid rgba(255,92,106,.3); }
.gcp-score-badge--info { background: rgba(108,99,255,.15); color: var(--gcp-violet-lt); border: 1px solid rgba(108,99,255,.3); }

.gcp-letter-grade {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gcp-gold);
}

/* Stats row */
.gcp-stats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}
.gcp-stat {
    background: var(--gcp-surface);
    border: 1px solid var(--gcp-border);
    border-radius: var(--gcp-radius-sm);
    padding: 12px 14px;
}
.gcp-stat__label {
    font-size: .68rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--gcp-muted);
    margin-bottom: 4px;
}
.gcp-stat__value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gcp-text);
}

/* Progress bar */
.gcp-progress-wrap { margin-bottom: 20px; }
.gcp-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: .74rem;
    color: var(--gcp-muted);
    margin-bottom: 7px;
}
.gcp-progress-bar {
    height: 8px;
    background: var(--gcp-surface);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--gcp-border);
}
.gcp-progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width .6s cubic-bezier(.4,0,.2,1);
}
.gcp-progress-fill--high   { background: linear-gradient(90deg, #48C9B0, #6CE5CF); }
.gcp-progress-fill--mid    { background: linear-gradient(90deg, #F5C518, #FFD85C); }
.gcp-progress-fill--low    { background: linear-gradient(90deg, #FF5C6A, #FF8C96); }

/* Breakdown table */
.gcp-breakdown { margin-top: 16px; }
.gcp-breakdown__title {
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--gcp-muted);
    margin: 0 0 10px;
    font-weight: 600;
}
.gcp-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .82rem;
}
.gcp-breakdown-table th {
    text-align: left;
    padding: 8px 10px;
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--gcp-muted);
    border-bottom: 1px solid var(--gcp-border);
}
.gcp-breakdown-table td {
    padding: 8px 10px;
    border-bottom: 1px solid rgba(42,48,80,.5);
    color: var(--gcp-text);
}
.gcp-breakdown-table tbody tr:last-child td { border-bottom: none; }
.gcp-breakdown-table .col-right { text-align: right; }
.gcp-breakdown-table .row-total td {
    font-weight: 700;
    color: var(--gcp-violet-lt);
    border-top: 1px solid var(--gcp-border);
}

/* Error */
.gcp-error {
    background: rgba(255,92,106,.1);
    border: 1px solid rgba(255,92,106,.3);
    border-radius: var(--gcp-radius-sm);
    color: var(--gcp-red);
    padding: 12px 16px;
    font-size: .86rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ── GRADE SCALE REFERENCE ── */
.gcp-reference {
    border-top: 1px solid var(--gcp-border);
    padding: 0;
}
.gcp-reference__toggle {
    list-style: none;
    padding: 16px 32px;
    font-size: .82rem;
    font-weight: 600;
    color: var(--gcp-muted);
    cursor: pointer;
    transition: color .15s;
    user-select: none;
}
.gcp-reference__toggle:hover { color: var(--gcp-text); }
.gcp-reference[open] .gcp-reference__toggle { color: var(--gcp-text); }

.gcp-scale-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 8px;
    padding: 0 32px 24px;
}
.gcp-scale-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: .8rem;
    color: var(--gcp-muted);
}
.gcp-badge {
    display: inline-block;
    width: 40px;
    text-align: center;
    padding: 3px 0;
    border-radius: 5px;
    font-size: .75rem;
    font-weight: 700;
    flex-shrink: 0;
}
.gcp-badge--a   { background: rgba(72,201,176,.2); color: #48C9B0; }
.gcp-badge--am  { background: rgba(72,201,176,.15); color: #4BBDA5; }
.gcp-badge--bp  { background: rgba(108,99,255,.2); color: #8B85FF; }
.gcp-badge--b   { background: rgba(108,99,255,.15); color: #7B74FF; }
.gcp-badge--bm  { background: rgba(108,99,255,.12); color: #6B64EE; }
.gcp-badge--cp  { background: rgba(245,197,24,.2); color: #F5C518; }
.gcp-badge--c   { background: rgba(245,197,24,.15); color: #DDB015; }
.gcp-badge--cm  { background: rgba(245,197,24,.1); color: #CC9F10; }
.gcp-badge--dp  { background: rgba(255,140,96,.15); color: #FF8C60; }
.gcp-badge--d   { background: rgba(255,110,80,.1); color: #FF6E50; }
.gcp-badge--f   { background: rgba(255,92,106,.15); color: #FF5C6A; }

/* ── FOOTER NOTE ── */
.gcp-footer-note {
    text-align: center;
    font-size: .72rem;
    color: #3D4668;
    padding: 14px 20px 18px;
    margin: 0;
    border-top: 1px solid var(--gcp-border);
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
    .gcp-panel { padding: 20px 18px 18px; }
    .gcp-header { padding: 22px 18px 18px; }
    .gcp-tabs { padding: 0 12px; }
    .gcp-tab { padding: 14px 12px 12px; font-size: .8rem; }
    .gcp-score-number { font-size: 2.8rem; }
    .gcp-grid-2 { grid-template-columns: 1fr; }
    .gcp-scale-grid { padding: 0 18px 18px; }
    .gcp-reference__toggle { padding: 14px 18px; }
    .gcp-field--inline { grid-template-columns: 1fr; }
}