/* base64enc.css */
:root {
    --b64-bg: #0d1117;
    --b64-surface: #161b22;
    --b64-border: #30363d;
    --b64-accent: #00d4aa;
    --b64-accent2: #7c3aed;
    --b64-text: #e6edf3;
    --b64-muted: #8b949e;
    --b64-error: #f85149;
    --b64-success: #3fb950;
    --b64-tab-active: #00d4aa;
}

.b64-hero {
    background: var(--b64-bg);
    min-height: 100vh;
    padding: 2rem 0 4rem;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

/* 헤더 */
.b64-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.b64-badge {
    display: inline-block;
    background: linear-gradient(135deg, #00d4aa22, #7c3aed22);
    border: 1px solid var(--b64-accent);
    color: var(--b64-accent);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    padding: 0.25rem 0.75rem;
    border-radius: 2px;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.b64-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--b64-text);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.b64-title span {
    color: var(--b64-accent);
}

.b64-subtitle {
    color: var(--b64-muted);
    font-size: 0.9rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* 탭 */
.b64-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 6px;
    padding: 4px;
}

.b64-tab {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    background: transparent;
    color: var(--b64-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
    letter-spacing: 0.05em;
}

.b64-tab.active {
    background: var(--b64-accent);
    color: #0d1117;
}

.b64-tab:hover:not(.active) {
    color: var(--b64-text);
    background: #ffffff10;
}

/* 패널 */
.b64-panel {
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.b64-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--b64-border);
    background: #ffffff05;
}

.b64-panel-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--b64-muted);
}

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

.b64-btn-sm {
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    border: 1px solid var(--b64-border);
    background: transparent;
    color: var(--b64-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s;
    letter-spacing: 0.03em;
}

.b64-btn-sm:hover {
    border-color: var(--b64-accent);
    color: var(--b64-accent);
}

.b64-textarea {
    width: 100%;
    min-height: 180px;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--b64-text);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
}

.b64-textarea::placeholder {
    color: var(--b64-muted);
    opacity: 0.5;
}

/* 가운데 변환 버튼 영역 */
.b64-convert-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

.b64-btn-convert {
    padding: 0.7rem 2rem;
    background: var(--b64-accent);
    color: #0d1117;
    border: none;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 800;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.b64-btn-convert:hover {
    background: #00f0c0;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px #00d4aa44;
}

.b64-btn-convert:active {
    transform: translateY(0);
}

/* URL-safe 토글 */
.b64-options {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.75rem 1rem;
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 6px;
    margin-bottom: 1.5rem;
}

.b64-option-label {
    font-size: 0.8rem;
    color: var(--b64-muted);
    letter-spacing: 0.05em;
}

.b64-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--b64-muted);
}

.b64-toggle input[type=checkbox] {
    accent-color: var(--b64-accent);
    width: 15px;
    height: 15px;
}

.b64-toggle:hover {
    color: var(--b64-text);
}

/* 상태 표시 */
.b64-status {
    font-size: 0.78rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: none;
    font-family: -apple-system, sans-serif;
}

.b64-status.show { display: block; }
.b64-status.error { background: #f8514922; color: var(--b64-error); border: 1px solid #f8514944; }
.b64-status.success { background: #3fb95022; color: var(--b64-success); border: 1px solid #3fb95044; }

/* 파일 드롭존 */
.b64-dropzone {
    border: 2px dashed var(--b64-border);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--b64-surface);
}

.b64-dropzone:hover, .b64-dropzone.drag-over {
    border-color: var(--b64-accent);
    background: #00d4aa08;
}

.b64-dropzone-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.b64-dropzone-text {
    color: var(--b64-muted);
    font-size: 0.85rem;
    font-family: -apple-system, sans-serif;
}

.b64-dropzone-text strong {
    color: var(--b64-accent);
}

/* 정보 카드 */
.b64-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.b64-info-card {
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
}

.b64-info-card-label {
    font-size: 0.7rem;
    color: var(--b64-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.25rem;
}

.b64-info-card-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--b64-accent);
}

/* 복사 성공 토스트 */
.b64-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--b64-accent);
    color: #0d1117;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
    transform: translateY(4rem);
    opacity: 0;
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 9999;
    pointer-events: none;
}

.b64-toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* ── 기록 패널 ─────────────────────────────────── */
.b64-history-section {
    margin-top: 2.5rem;
}

.b64-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.b64-history-title {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--b64-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.b64-plan-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.b64-plan-badge.free    { background: #ffffff15; color: var(--b64-muted); border: 1px solid var(--b64-border); }
.b64-plan-badge.premium { background: linear-gradient(135deg,#f59e0b,#ef4444); color:#fff; }

.b64-hist-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 1rem;
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    transition: border-color 0.15s;
    gap: 1rem;
}

.b64-hist-item:hover { border-color: var(--b64-accent); }

.b64-hist-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    overflow: hidden;
    flex: 1;
}

.b64-hist-mode {
    font-size: 0.65rem;
    font-weight: 800;
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    background: var(--b64-accent);
    color: #0d1117;
    flex-shrink: 0;
    letter-spacing: 0.05em;
}

.b64-hist-label {
    font-size: 0.82rem;
    color: var(--b64-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: -apple-system, sans-serif;
}

.b64-hist-time {
    font-size: 0.72rem;
    color: var(--b64-muted);
    flex-shrink: 0;
    font-family: -apple-system, sans-serif;
}

.b64-hist-actions {
    display: flex;
    gap: 0.4rem;
    flex-shrink: 0;
}

.b64-btn-del:hover {
    border-color: var(--b64-error) !important;
    color: var(--b64-error) !important;
}

.b64-history-empty {
    text-align: center;
    padding: 1.5rem;
    color: var(--b64-muted);
    font-size: 0.82rem;
    background: var(--b64-surface);
    border: 1px dashed var(--b64-border);
    border-radius: 6px;
    font-family: -apple-system, sans-serif;
}

/* 비로그인 안내 박스 */
.b64-login-nudge {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: 8px;
    margin-top: 2rem;
}

.b64-login-nudge-text {
    flex: 1;
    font-size: 0.82rem;
    color: var(--b64-muted);
    line-height: 1.5;
    font-family: -apple-system, sans-serif;
}

.b64-login-nudge-text strong {
    color: var(--b64-text);
    display: block;
    margin-bottom: 0.2rem;
}

.b64-btn-login {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--b64-accent);
    color: var(--b64-accent);
    border-radius: 5px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: all 0.15s;
}

.b64-btn-login:hover {
    background: var(--b64-accent);
    color: #0d1117;
}

/* 프리미엄 업그레이드 배너 */
.b64-premium-nudge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #f59e0b15, #ef444415);
    border: 1px solid #f59e0b44;
    border-radius: 6px;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
    font-family: -apple-system, sans-serif;
    color: var(--b64-text);
}

.b64-premium-nudge a {
    color: #f59e0b;
    font-weight: 700;
    text-decoration: none;
    margin-left: auto;
    white-space: nowrap;
    font-size: 0.75rem;
}

@media (max-width: 576px) {
    .b64-hist-time  { display: none; }
    .b64-hist-item  { flex-direction: column; align-items: flex-start; }
    .b64-hist-actions { width: 100%; justify-content: flex-end; }
}