/* Base64 Encoder — namespace: .b64-* */

/* ── Tool wrapper ──────────────────────────────────────────────────────── */
.b64-tool {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* ── Mode tabs ─────────────────────────────────────────────────────────── */
.b64-tabs {
    display: flex;
    gap: 0.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
}

.b64-tab-btn {
    flex: 1;
    padding: 0.55rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 7px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    min-height: 44px;
    white-space: nowrap;
}

.b64-tab-btn:hover {
    background: rgba(var(--primary-rgb), 0.08);
    color: var(--text);
}

.b64-tab-btn.is-active {
    background: var(--primary);
    color: var(--on-primary);
}

/* ── Options row ───────────────────────────────────────────────────────── */
.b64-options-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.b64-options-row .input-group {
    flex: 1;
    min-width: 160px;
}

.b64-select {
    width: 100%;
}

/* ── Panel ─────────────────────────────────────────────────────────────── */
.b64-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.b64-textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.15s;
    min-height: 120px;
}

.b64-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.b64-textarea.b64-output {
    color: var(--text-muted);
    cursor: default;
    background: var(--bg);
}

.b64-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

/* ── File drop zone ────────────────────────────────────────────────────── */
.b64-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 3rem 2rem;
    border: 2px dashed var(--border);
    border-radius: 12px;
    background: var(--surface);
    text-align: center;
    cursor: default;
    transition: border-color 0.15s, background 0.15s;
}

.b64-dropzone.is-dragover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.06);
}

.b64-drop-icon {
    color: var(--text-muted);
    opacity: 0.5;
    pointer-events: none;
}

.b64-dropzone p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.b64-file-label {
    color: var(--primary);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.b64-file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
}

.b64-file-limit {
    font-size: 0.8125rem;
    color: var(--text-muted);
    opacity: 0.7;
}

.b64-file-name {
    font-size: 0.875rem;
    color: var(--text);
    font-weight: 500;
    min-height: 1.25rem;
    word-break: break-all;
}

/* ── Hero result card ──────────────────────────────────────────────────── */
.b64-hero {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1.25rem 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.12) 0%, rgba(6, 182, 212, 0.08) 100%);
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    border-radius: 12px;
}

.b64-hero-kicker {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
}

.b64-hero-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.1;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.b64-hero-value--success {
    color: var(--success);
}

.b64-hero-value--error {
    color: var(--danger);
}

.b64-hero-detail {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ── Stats grid ────────────────────────────────────────────────────────── */
.b64-stats-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr 1fr;
    gap: 0.5rem 1rem;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    align-items: center;
}

.b64-stat {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.b64-stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.b64-stat-value {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.b64-stat-arrow {
    font-size: 1.25rem;
    color: var(--text-muted);
    text-align: center;
}

.b64-stat-overhead--pos {
    color: var(--warning);
}

.b64-stat-overhead--neg {
    color: var(--success);
}

/* ── Ratio bar (power feature) ─────────────────────────────────────────── */
.b64-ratio-bar {
    display: flex;
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    background: var(--border);
}

.b64-ratio-original {
    background: var(--primary);
    transition: width 0.3s ease;
    height: 100%;
}

.b64-ratio-overhead {
    background: var(--warning);
    transition: width 0.3s ease;
    height: 100%;
}

.b64-ratio-legend {
    display: flex;
    gap: 1.25rem;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin: 0;
}

.b64-legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 0.3rem;
}

.b64-legend-dot--orig {
    background: var(--primary);
}

.b64-legend-dot--overhead {
    background: var(--warning);
}

/* ── Output card ───────────────────────────────────────────────────────── */
.b64-output-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.b64-output-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.b64-output-title {
    margin: 0;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text);
}

.b64-output-actions {
    display: flex;
    gap: 0.5rem;
}

/* ── Status message ────────────────────────────────────────────────────── */
.b64-status {
    font-size: 0.875rem;
    min-height: 1.25rem;
    color: var(--text-muted);
    transition: color 0.15s;
}

.b64-status--error  { color: var(--danger); }
.b64-status--success { color: var(--success); }
.b64-status--info   { color: var(--secondary); }

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .b64-tabs {
        flex-direction: column;
    }

    .b64-tab-btn {
        text-align: center;
    }

    .b64-options-row {
        flex-direction: column;
    }

    .b64-options-row .input-group {
        min-width: unset;
    }

    .b64-stats-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }

    .b64-stat-arrow {
        display: none;
    }

    .b64-hero-value {
        font-size: 1.5rem;
    }

    .b64-output-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .b64-output-actions {
        width: 100%;
    }

    .b64-output-actions .btn {
        flex: 1;
    }

    .b64-actions .btn {
        flex: 1;
    }

    .b64-ratio-legend {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .b64-dropzone { padding: 2rem 1rem; }
}