/* ==========================================================================
   Utilix — Base64 Tools Page
   ========================================================================== */

/* Hero */
.b64-hero { padding-bottom: 40px; }

.b64-hero__grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 40px;
    align-items: center;
}

.b64-hero__main {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.b64-hero__visual {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.b64-hero__encode-flow {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--bg-section);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}

.b64-hero__text-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    min-width: 100px;
}

.b64-hero__text-line {
    display: block;
    height: 8px;
    border-radius: 4px;
    background: #E2E8F0;
}

.b64-hero__text-line--short { width: 60%; }

.b64-hero__arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: #fff;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.b64-hero__arrow svg, .b64-hero__arrow [data-lucide] { width: 20px; height: 20px; }

.b64-hero__b64-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px 20px;
    font-family: ui-monospace, monospace;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary);
    background: #EFF6FF;
    border: 1px solid #BFDBFE;
    border-radius: 12px;
}

.b64-hero__b64-block small {
    font-size: 0.6875rem;
    font-weight: 600;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* Mode grid */
.b64-modes-section { padding: 0 0 28px; margin-top: -8px; }

.b64-modes-section__title {
    margin: 0 0 16px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--heading);
}

.b64-mode-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.b64-mode-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 14px 8px;
    font-family: inherit;
    background: #fff;
    border: 2px solid var(--border);
    border-radius: 14px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.b64-mode-card:hover {
    border-color: #BFDBFE;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
    transform: translateY(-1px);
}

.b64-mode-card.is-active {
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.15);
}

.b64-mode-card__check {
    position: absolute;
    top: 8px;
    right: 8px;
    display: none;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
}

.b64-mode-card.is-active .b64-mode-card__check { display: flex; }
.b64-mode-card__check svg, .b64-mode-card__check [data-lucide] { width: 11px; height: 11px; }

.b64-mode-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

.b64-mode-card__icon svg, .b64-mode-card__icon [data-lucide] { width: 20px; height: 20px; }

.b64-mode-card__icon--blue { background: #DBEAFE; color: #2563EB; }
.b64-mode-card__icon--green { background: #DCFCE7; color: #16A34A; }
.b64-mode-card__icon--cyan { background: #CFFAFE; color: #0891B2; }
.b64-mode-card__icon--teal { background: #CCFBF1; color: #0D9488; }
.b64-mode-card__icon--orange { background: #FFEDD5; color: #EA580C; }
.b64-mode-card__icon--amber { background: #FEF3C7; color: #D97706; }
.b64-mode-card__icon--purple { background: #EDE9FE; color: #7C3AED; }
.b64-mode-card__icon--pink { background: #FCE7F3; color: #DB2777; }
.b64-mode-card__icon--indigo { background: #E0E7FF; color: #4F46E5; }
.b64-mode-card__icon--violet { background: #EDE9FE; color: #7C3AED; }

.b64-mode-card__label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--heading);
    text-align: center;
    line-height: 1.3;
}

/* Layout */
.b64-main { padding: 0 0 64px; }

.b64-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
    align-items: start;
}

.b64-tool {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
    overflow: hidden;
}

/* Panes */
.b64-panes {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    min-height: 420px;
}

.b64-pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
}

.b64-pane__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    background: #F8FAFC;
}

.b64-pane__title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--heading);
}

.b64-pane__actions { display: flex; gap: 6px; flex-wrap: wrap; }

.b64-pane-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.b64-pane-btn:hover { color: var(--primary); border-color: #BFDBFE; }
.b64-pane-btn svg, .b64-pane-btn [data-lucide] { width: 13px; height: 13px; }

.b64-pane__footer {
    padding: 8px 16px;
    border-top: 1px solid var(--border);
    background: #FAFBFC;
}

.b64-stats {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-light);
}

.b64-panes__divider {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #FAFBFC;
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
}

.b64-swap {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 50%;
    color: #64748B;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
    transition: background 0.2s, color 0.2s, transform 0.2s;
}

.b64-swap:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    transform: scale(1.05);
}

.b64-swap svg, .b64-swap [data-lucide] { width: 16px; height: 16px; }

/* Editor */
.b64-editor-wrap {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.b64-line-numbers {
    flex-shrink: 0;
    width: 44px;
    padding: 14px 8px 14px 0;
    font-family: ui-monospace, monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    text-align: right;
    color: #94A3B8;
    background: #F8FAFC;
    border-right: 1px solid var(--border);
    user-select: none;
    overflow: hidden;
    white-space: pre;
}

.b64-editor {
    flex: 1;
    width: 100%;
    min-height: 280px;
    padding: 14px 16px;
    font-family: ui-monospace, monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--heading);
    background: #fff;
    border: none;
    outline: none;
    resize: none;
    tab-size: 2;
}

.b64-editor--output { background: #FAFBFC; }
.b64-editor::placeholder { color: #94A3B8; }

/* Dropzone */
.b64-dropzone {
    flex: 1;
    margin: 16px;
    border: 2px dashed #CBD5E1;
    border-radius: 16px;
    background: #F8FAFC;
    transition: border-color 0.2s, background 0.2s;
}

.b64-dropzone.is-dragover {
    border-color: var(--primary);
    background: #EFF6FF;
}

.b64-dropzone__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 40px 20px;
    text-align: center;
}

.b64-dropzone__inner svg, .b64-dropzone__inner [data-lucide] {
    width: 40px;
    height: 40px;
    color: var(--primary);
}

.b64-dropzone__inner p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-light);
    max-width: 260px;
}

/* Image preview */
.b64-image-preview {
    padding: 16px;
    text-align: center;
    border-top: 1px solid var(--border);
    background: #FAFBFC;
}

.b64-image-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
}

.b64-image-preview img[hidden] {
    display: none;
}

.b64-image-preview__placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 120px;
    padding: 24px 16px;
    color: var(--text-light);
    background: #fff;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
}

.b64-image-preview__placeholder svg,
.b64-image-preview__placeholder [data-lucide] {
    width: 36px;
    height: 36px;
    color: #94a3b8;
}

.b64-image-preview__placeholder span {
    font-size: 0.8125rem;
    line-height: 1.5;
    max-width: 220px;
}

.b64-image-preview__placeholder[hidden] {
    display: none;
}

.b64-decode-download {
    padding: 12px 16px 16px;
    border-top: 1px solid var(--border);
    background: #FAFBFC;
}

.b64-decode-download[hidden] {
    display: none;
}

[data-theme="dark"] .b64-decode-download {
    background: #1a2332;
}

[data-theme="dark"] .b64-image-preview__placeholder {
    background: var(--bg);
    border-color: #475569;
    color: #94a3b8;
}

[data-theme="dark"] .b64-image-preview__placeholder svg,
[data-theme="dark"] .b64-image-preview__placeholder [data-lucide] {
    color: #64748b;
}

/* Options */
.b64-options {
    display: flex;
    justify-content: flex-end;
    padding: 12px 16px;
    background: #FAFBFC;
    border-top: 1px solid var(--border);
}

.b64-options__actions {
    display: inline-flex;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.b64-auto-row {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    cursor: pointer;
    border-right: 1px solid var(--border);
    user-select: none;
}

.b64-auto-row__text {
    font-size: 0.6875rem;
    font-weight: 700;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.b64-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

.b64-switch input { position: absolute; opacity: 0; width: 0; height: 0; }

.b64-switch__slider {
    position: absolute;
    inset: 0;
    background: #CBD5E1;
    border-radius: 100px;
    transition: background 0.2s;
}

.b64-switch__slider::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.12);
}

.b64-switch input:checked + .b64-switch__slider { background: var(--primary); }
.b64-switch input:checked + .b64-switch__slider::before { transform: translateX(18px); }

.b64-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.b64-btn--primary {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 9999px;
    min-height: 44px;
    padding: 0 22px;
}

.b64-btn--primary:hover { background: #1D4ED8; }

.b64-btn--outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.b64-btn--block { width: 100%; margin-top: 10px; }

.b64-spin { animation: b64-spin 0.8s linear infinite; }
@keyframes b64-spin { to { transform: rotate(360deg); } }

/* Info note */
.b64-info-note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin: 0;
    padding: 14px 20px;
    background: #EFF6FF;
    border-top: 1px solid #BFDBFE;
    color: #1E40AF;
    font-size: 0.8125rem;
    line-height: 1.6;
}

.b64-info-note svg, .b64-info-note [data-lucide] {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-top: 2px;
}

.b64-info-note p { margin: 0; }

/* Result */
.b64-result {
    position: relative;
    overflow: hidden;
    padding: 20px 24px 22px;
    border-top: 1px solid var(--border);
    background:
        radial-gradient(ellipse 80% 60% at 0% 0%, rgba(16, 185, 129, 0.12) 0%, transparent 55%),
        linear-gradient(180deg, #ecfdf5 0%, #fff 100%);
}

.b64-result::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1px 1px, rgba(15, 23, 42, 0.04) 1px, transparent 0);
    background-size: 20px 20px;
    pointer-events: none;
    opacity: 0.5;
}

.b64-result--error {
    background:
        radial-gradient(ellipse 80% 60% at 0% 0%, rgba(239, 68, 68, 0.1) 0%, transparent 55%),
        linear-gradient(180deg, #fef2f2 0%, #fff 100%);
}

.b64-result__banner {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.b64-result__badge {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.b64-result--error .b64-result__badge {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.35);
}

.b64-result__badge svg,
.b64-result__badge [data-lucide] {
    width: 24px;
    height: 24px;
    stroke-width: 2.25;
}

.b64-result__headline { min-width: 0; }

.b64-result__eyebrow {
    margin: 0 0 2px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #059669;
}

.b64-result--error .b64-result__eyebrow { color: #dc2626; }

.b64-result__title {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--heading);
    letter-spacing: -0.01em;
}

.b64-result__message {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin: 0;
    padding: 12px 14px;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: #334155;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 10px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.b64-result--error .b64-result__message {
    border-color: rgba(239, 68, 68, 0.2);
    color: #7f1d1d;
}

.b64-result__message svg,
.b64-result__message [data-lucide] {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin-top: 2px;
    color: #10b981;
}

.b64-result--error .b64-result__message svg,
.b64-result--error .b64-result__message [data-lucide] {
    color: #ef4444;
}

/* Sidebar */
.b64-sidebar { display: flex; flex-direction: column; gap: 16px; }

.b64-card {
    padding: 20px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.04);
}

.b64-card h2 {
    margin: 0 0 12px;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--heading);
}

.b64-card p {
    margin: 0 0 12px;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text);
}

.b64-checklist {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.b64-checklist li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.8125rem;
    color: var(--text);
}

.b64-checklist svg, .b64-checklist [data-lucide] {
    width: 16px;
    height: 16px;
    color: #22C55E;
    flex-shrink: 0;
    margin-top: 2px;
}

.b64-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    padding: 4px;
    background: #F1F5F9;
    border-radius: 10px;
}

.b64-tab {
    flex: 1;
    padding: 6px 4px;
    font-family: inherit;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-light);
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.b64-tab.is-active {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08);
}

.b64-example-preview {
    margin: 0 0 10px;
    padding: 10px 12px;
    max-height: 120px;
    overflow: auto;
    font-family: ui-monospace, monospace;
    font-size: 0.6875rem;
    line-height: 1.5;
    color: var(--heading);
    background: #F8FAFC;
    border: 1px solid var(--border);
    border-radius: 10px;
    white-space: pre-wrap;
}

.b64-related-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.b64-related-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 6px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text);
    border-radius: 10px;
    transition: background 0.2s, color 0.2s;
}

.b64-related-list a:hover { background: #F8FAFC; color: var(--primary); }

.b64-related-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 10px;
}

.b64-related-icon--blue { background: #DBEAFE; color: #2563EB; }
.b64-related-icon--purple { background: #EDE9FE; color: #7C3AED; }
.b64-related-icon--green { background: #DCFCE7; color: #16A34A; }
.b64-related-icon--orange { background: #FFEDD5; color: #EA580C; }
.b64-related-icon--indigo { background: #E0E7FF; color: #4F46E5; }

.b64-link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 12px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary);
}

/* Features */
.b64-features {
    padding: 56px 0;
    background: #F8FAFC;
    border-top: 1px solid var(--border);
}

.b64-features__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.b64-feature-card {
    padding: 24px 20px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.b64-feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.b64-feature-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    border-radius: 14px;
}

.b64-feature-card__icon svg, .b64-feature-card__icon [data-lucide] { width: 22px; height: 22px; }
.b64-feature-card__icon--blue { background: #DBEAFE; color: #2563EB; }
.b64-feature-card__icon--green { background: #DCFCE7; color: #16A34A; }
.b64-feature-card__icon--purple { background: #EDE9FE; color: #7C3AED; }
.b64-feature-card__icon--orange { background: #FFEDD5; color: #EA580C; }

.b64-feature-card h3 {
    margin: 0 0 8px;
    font-size: 0.9375rem;
    color: var(--heading);
}

.b64-feature-card p {
    margin: 0;
    font-size: 0.8125rem;
    line-height: 1.55;
    color: var(--text-light);
}

/* What / Howto sections */
.b64-section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    padding: 5px 12px;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #2563EB;
    background: #EFF6FF;
    border: 1px solid #BFDBFE;
    border-radius: 100px;
}

.b64-what {
    padding: 72px 0;
    background: linear-gradient(180deg, #F8FAFC 0%, #fff 100%);
    border-top: 1px solid var(--border);
}

.b64-what__grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 48px;
    align-items: center;
}

.b64-what__content h2 {
    margin: 0 0 14px;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--heading);
}

.b64-what__lead { margin: 0 0 12px; line-height: 1.75; color: var(--text); }
.b64-what__text { margin: 0 0 20px; line-height: 1.75; color: var(--text-light); }

.b64-what__pills { display: flex; flex-wrap: wrap; gap: 10px; }

.b64-what__pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #334155;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 100px;
}

.b64-what__pill svg, .b64-what__pill [data-lucide] { width: 15px; height: 15px; color: var(--primary); }

.b64-what__demo {
    padding: 24px;
    background: var(--bg-section);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.b64-what__demo-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
}

.b64-what__demo-row--b64 { background: #EFF6FF; border-color: #BFDBFE; }

.b64-what__demo-label {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-light);
}

.b64-what__demo-row code {
    font-family: ui-monospace, monospace;
    font-size: 0.875rem;
    color: var(--primary);
}

.b64-what__demo-arrow {
    display: flex;
    justify-content: center;
    padding: 8px 0;
    color: var(--primary);
}

.b64-howto { padding: 72px 0; }

.b64-section-head { margin-bottom: 36px; }
.b64-section-head--center { text-align: center; max-width: 560px; margin-left: auto; margin-right: auto; }
.b64-section-head h2 { margin: 0 0 10px; font-size: 1.75rem; font-weight: 800; color: var(--heading); }
.b64-section-head p { margin: 0; color: var(--text-light); }

.b64-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.b64-step {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 28px 20px 24px;
    text-align: center;
    background: #F8FAFC;
    border: 1px solid var(--border);
    border-radius: 18px;
}

.b64-step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: 18px 18px 0 0;
    background: var(--step-accent, var(--primary));
}

.b64-step--1 { --step-accent: #3B82F6; }
.b64-step--2 { --step-accent: #8B5CF6; }
.b64-step--3 { --step-accent: #F59E0B; }
.b64-step--4 { --step-accent: #10B981; }

.b64-step__num {
    position: absolute;
    top: 14px;
    left: 14px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
    color: #fff;
    background: var(--step-accent);
    border-radius: 50%;
}

.b64-step__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    margin: 6px 0 14px;
    background: #fff;
    color: var(--step-accent);
    border-radius: 16px;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
}

.b64-step strong { display: block; margin-bottom: 8px; font-size: 0.9375rem; color: var(--heading); }
.b64-step p { margin: 0; font-size: 0.8125rem; line-height: 1.55; color: var(--text-light); }

.b64-faq { padding: 56px 0; background: #F8FAFC; }

/* Responsive */
@media (max-width: 1200px) {
    .b64-mode-grid { grid-template-columns: repeat(5, 1fr); }
    .b64-hero__grid { grid-template-columns: 1fr 300px; }
}

@media (max-width: 1024px) {
    .b64-layout { grid-template-columns: 1fr; }
    .b64-hero__grid { grid-template-columns: 1fr; }
    .b64-hero__visual { display: none; }
    .b64-features__grid { grid-template-columns: repeat(2, 1fr); }
    .b64-what__grid { grid-template-columns: 1fr; }
    .b64-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .b64-panes {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    .b64-panes__divider {
        border: none;
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
        padding: 8px 0;
    }
    .b64-swap { transform: rotate(90deg); }
    .b64-mode-grid { grid-template-columns: repeat(2, 1fr); }
    .b64-features__grid { grid-template-columns: 1fr; }
    .b64-steps { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Dark Mode
   ========================================================================== */

[data-theme="dark"] .b64-tool,
[data-theme="dark"] .b64-card,
[data-theme="dark"] .b64-feature-card {
    background: var(--bg-section);
    border-color: var(--border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .b64-pane__header,
[data-theme="dark"] .b64-pane__footer,
[data-theme="dark"] .b64-panes__divider,
[data-theme="dark"] .b64-options {
    background: #1a2332;
    border-color: var(--border);
}

[data-theme="dark"] .b64-line-numbers {
    background: #1a2332;
    border-color: var(--border);
    color: #64748b;
}

[data-theme="dark"] .b64-editor {
    color: #e2e8f0;
    background: var(--bg);
}

[data-theme="dark"] .b64-editor--output { background: #141c2b; }

[data-theme="dark"] .b64-pane-btn,
[data-theme="dark"] .b64-swap,
[data-theme="dark"] .b64-options__actions {
    background: var(--bg-section);
    border-color: var(--border);
    color: var(--text);
}

[data-theme="dark"] .b64-mode-card {
    background: var(--bg-section);
    border-color: var(--border);
}

[data-theme="dark"] .b64-mode-card:hover {
    border-color: #3b82f6;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.15);
}

[data-theme="dark"] .b64-mode-card__icon--blue { background: var(--blue-bg); color: var(--blue-fg); }
[data-theme="dark"] .b64-mode-card__icon--green { background: var(--green-bg); color: var(--green-fg); }
[data-theme="dark"] .b64-mode-card__icon--cyan { background: var(--cyan-bg); color: var(--cyan-fg); }
[data-theme="dark"] .b64-mode-card__icon--teal { background: var(--teal-bg); color: var(--teal-fg); }
[data-theme="dark"] .b64-mode-card__icon--orange { background: var(--orange-bg); color: var(--orange-fg); }
[data-theme="dark"] .b64-mode-card__icon--amber { background: var(--orange-bg); color: var(--orange-fg); }
[data-theme="dark"] .b64-mode-card__icon--purple { background: var(--purple-bg); color: var(--purple-fg); }
[data-theme="dark"] .b64-mode-card__icon--pink { background: var(--pink-bg); color: var(--pink-fg); }
[data-theme="dark"] .b64-mode-card__icon--indigo { background: var(--indigo-bg); color: var(--indigo-fg); }
[data-theme="dark"] .b64-mode-card__icon--violet { background: var(--purple-bg); color: var(--purple-fg); }

[data-theme="dark"] .b64-dropzone {
    background: var(--bg);
    border-color: #475569;
}

[data-theme="dark"] .b64-dropzone.is-dragover {
    background: rgba(37, 99, 235, 0.1);
    border-color: #60a5fa;
}

[data-theme="dark"] .b64-image-preview { background: #1a2332; }

[data-theme="dark"] .b64-info-note {
    background: rgba(37, 99, 235, 0.12);
    border-color: rgba(59, 130, 246, 0.25);
    color: #bfdbfe;
}

[data-theme="dark"] .b64-result {
    background:
        radial-gradient(ellipse 80% 60% at 0% 0%, rgba(16, 185, 129, 0.14) 0%, transparent 55%),
        linear-gradient(180deg, rgba(6, 78, 59, 0.35) 0%, var(--bg-section) 100%);
}

[data-theme="dark"] .b64-result::before {
    background-image: radial-gradient(circle at 1px 1px, rgba(148, 163, 184, 0.08) 1px, transparent 0);
}

[data-theme="dark"] .b64-result--error {
    background:
        radial-gradient(ellipse 80% 60% at 0% 0%, rgba(239, 68, 68, 0.12) 0%, transparent 55%),
        linear-gradient(180deg, rgba(127, 29, 29, 0.3) 0%, var(--bg-section) 100%);
}

[data-theme="dark"] .b64-result__eyebrow { color: #34d399; }
[data-theme="dark"] .b64-result--error .b64-result__eyebrow { color: #f87171; }

[data-theme="dark"] .b64-result__message {
    color: #cbd5e1;
    background: rgba(15, 23, 42, 0.7);
    border-color: rgba(16, 185, 129, 0.25);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

[data-theme="dark"] .b64-result--error .b64-result__message {
    color: #fecaca;
    border-color: rgba(239, 68, 68, 0.3);
}

[data-theme="dark"] .b64-tabs { background: var(--bg); }
[data-theme="dark"] .b64-tab.is-active { background: var(--bg-section); }

[data-theme="dark"] .b64-example-preview {
    background: var(--bg);
    border-color: var(--border);
    color: #cbd5e1;
}

[data-theme="dark"] .b64-related-list a:hover { background: var(--bg); }

[data-theme="dark"] .b64-features,
[data-theme="dark"] .b64-faq {
    background: var(--bg-section);
}

[data-theme="dark"] .b64-what {
    background: linear-gradient(180deg, #1e293b 0%, var(--bg) 100%);
}

[data-theme="dark"] .b64-what__pill,
[data-theme="dark"] .b64-what__demo-row {
    background: var(--bg-section);
    border-color: var(--border);
    color: #cbd5e1;
}

[data-theme="dark"] .b64-what__demo-row--b64 {
    background: rgba(37, 99, 235, 0.15);
    border-color: rgba(59, 130, 246, 0.25);
}

[data-theme="dark"] .b64-step {
    background: var(--bg-section);
    border-color: var(--border);
}

[data-theme="dark"] .b64-step__icon { background: var(--bg); }

[data-theme="dark"] .b64-section-eyebrow {
    color: #60a5fa;
    background: rgba(37, 99, 235, 0.15);
    border-color: rgba(59, 130, 246, 0.25);
}

[data-theme="dark"] .b64-hero__encode-flow {
    background: var(--bg-section);
    border-color: var(--border);
}

[data-theme="dark"] .b64-hero__text-block {
    background: var(--bg);
    border-color: var(--border);
}

[data-theme="dark"] .b64-hero__text-line { background: #475569; }

[data-theme="dark"] .b64-hero__b64-block {
    background: rgba(37, 99, 235, 0.15);
    border-color: rgba(59, 130, 246, 0.25);
    color: #60a5fa;
}

[data-theme="dark"] .b64-hero__b64-block small { color: #94a3b8; }