/* Base64 인코더/디코더 스타일 - mockup-generator 디자인 언어 차용 */
.base64-tool {
    --tool-primary: #0891b2;
    --tool-bg: #ecfeff;
    --tool-gradient: linear-gradient(135deg, #0891b2 0%, #2563eb 100%);
}

/* 히어로 */
.b64-hero {
    background: var(--tool-gradient);
    border-radius: 16px;
    padding: 36px 32px;
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 28px;
}
.b64-hero::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
}
.b64-hero::after {
    content: '';
    position: absolute;
    bottom: -120px;
    left: -60px;
    width: 260px;
    height: 260px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
}
.b64-hero h1 {
    font-size: 28px;
    font-weight: 800;
    position: relative;
    z-index: 1;
    margin: 10px 0 6px;
}
.b64-hero p {
    opacity: 0.85;
    position: relative;
    z-index: 1;
    margin-bottom: 0;
}

/* 에디터 카드 */
.editor-card {
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 14px;
    overflow: hidden;
}
.editor-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid #f1f3f5;
}
.editor-title {
    font-weight: 700;
    font-size: 14px;
    color: #343a40;
}
.editor-title i {
    color: var(--tool-primary);
}
.size-badge {
    font-size: 12px;
    font-weight: 600;
    color: #868e96;
    background: #f1f3f5;
    padding: 3px 10px;
    border-radius: 20px;
}
.editor-body {
    padding: 16px;
}
.editor-textarea {
    width: 100%;
    min-height: 180px;
    resize: vertical;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    background: #f8f9fb;
    padding: 14px 16px;
    font-size: 13px;
    line-height: 1.6;
    color: #212529;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
}
.editor-textarea:focus {
    border-color: var(--tool-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.12);
}
.editor-textarea[readonly] {
    background: #f1f5f9;
    color: #334155;
}

/* 액션 버튼 영역 */
.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin: 18px 0;
}
.btn-action {
    display: inline-flex;
    align-items: center;
    padding: 9px 18px;
    border-radius: 10px;
    border: 1px solid #dee2e6;
    background: #fff;
    color: #495057;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}
.btn-action:hover {
    border-color: var(--tool-primary);
    color: var(--tool-primary);
    background: var(--tool-bg);
}
.btn-action-primary {
    background: var(--tool-gradient);
    border: none;
    color: #fff;
}
.btn-action-primary:hover {
    background: var(--tool-gradient);
    border: none;
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(8, 145, 178, 0.3);
}
.btn-action-success {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    border: none;
    color: #fff;
}
.btn-action-success:hover {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    border: none;
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(22, 163, 74, 0.3);
}

/* 주요 기능 하이라이트 스트립 */
.feature-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 16px;
}
.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 14px;
    padding: 16px;
}
.feature-ico {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}
.feature-ico.ico-cyan { background: #cffafe; color: #0891b2; }
.feature-ico.ico-blue { background: #dbeafe; color: #2563eb; }
.feature-ico.ico-green { background: #dcfce7; color: #16a34a; }
.feature-item strong {
    display: block;
    font-size: 14px;
    color: #212529;
    margin-bottom: 2px;
}
.feature-item p {
    font-size: 12.5px;
    color: #868e96;
    margin: 0;
    line-height: 1.45;
}

/* 서포트 카드 */
.support-card {
    background: #fff;
    border: 1px solid #e9ecef;
    border-radius: 14px;
    overflow: hidden;
}
.support-card .card-hd {
    padding: 14px 18px;
    font-weight: 700;
    font-size: 15px;
    border-bottom: 1px solid #f1f3f5;
}
.support-card .card-bd {
    padding: 18px;
}
.support-subtitle {
    font-size: 15px;
    font-weight: 700;
    color: #343a40;
    margin: 18px 0 10px;
}

/* 아코디언 */
.base64-tool .accordion-button:not(.collapsed) {
    background-color: var(--tool-bg);
    color: var(--tool-primary);
    box-shadow: none;
}
.base64-tool .accordion-button:focus {
    box-shadow: none;
}

/* 반응형 */
@media (max-width: 768px) {
    .b64-hero { padding: 28px 20px; border-radius: 12px; }
    .b64-hero h1 { font-size: 22px; }
    .btn-action { flex: 1 1 calc(50% - 8px); justify-content: center; }
}