/* Base64 Encoder / Decoder
-------------------------------------- */

.b64-page {
    --b64-accent: #6c5ce7;
    --b64-accent-90: #6c5ce7e6;
    --b64-border: var(--flex-gray-15, rgba(0, 0, 0, 0.08));
    --b64-surface: var(--solid-white, #fff);
    --b64-radius: var(--round-7, 7px);
    --b64-radius-sm: var(--round-3, 3px);
    --b64-shadow: 0 2px 12px var(--shadow-12, rgba(0, 0, 0, 0.12));
    --b64-transition: var(--effect, 0.25s ease);
    position: relative;
    padding: 36px 0 80px;
}

/* Hero
-------------------------------------- */

.b64-hero {
    max-width: 800px;
    margin: 0 auto;
    padding: 18px 0 24px;
    text-align: center;
}

.b64-title {
    margin-bottom: 12px;
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.b64-subtitle {
    max-width: 640px;
    margin: 0 auto;
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    line-height: 1.65;
    color: var(--excerpt-color);
}

/* Companion Link
-------------------------------------- */

.b64-companion-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 14px;
    padding: 6px 16px;
    font-family: var(--meta-family);
    font-size: 0.82rem;
    font-weight: var(--meta-b-fweight, 600);
    color: var(--b64-accent);
    text-decoration: none;
    background: color-mix(in srgb, var(--b64-accent) 7%, transparent);
    border: 1px solid color-mix(in srgb, var(--b64-accent) 15%, transparent);
    border-radius: 20px;
    transition: var(--b64-transition);
}

.b64-companion-link svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.b64-companion-link:hover {
    color: #fff;
    background: var(--b64-accent);
    border-color: var(--b64-accent);
}

/* Tool Section
-------------------------------------- */

.b64-tool-section {
    margin-bottom: 28px;
}

.b64-tool-inner {
    border: 1px solid #ddd;
    border-radius: var(--b64-radius);
    background: var(--b64-surface);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03), 0 6px 24px rgba(0, 0, 0, 0.07);
    overflow: hidden;
}

/* Tabs
-------------------------------------- */

.b64-tabs {
    display: flex;
    gap: 0;
    padding: 0 16px;
    border-bottom: 1px solid var(--b64-border);
    background: #fafbfc;
}

.b64-tab {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 22px;
    font-family: var(--meta-family);
    font-size: 0.82rem;
    font-weight: var(--meta-b-fweight, 600);
    color: var(--body-fcolor, #666);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border: 0;
    background: transparent;
    cursor: pointer;
    transition: var(--b64-transition);
    white-space: nowrap;
}

.b64-tab::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: transparent;
    border-radius: 2px 2px 0 0;
    transition: var(--b64-transition);
}

.b64-tab svg {
    width: 15px;
    height: 15px;
    flex-shrink: 0;
    opacity: 0.7;
}

.b64-tab:hover {
    color: var(--headline-fcolor, #111);
}

.b64-tab:hover svg {
    opacity: 1;
}

.b64-tab-active {
    color: var(--b64-accent);
    font-weight: 700;
}

.b64-tab-active::after {
    background: var(--b64-accent);
}

.b64-tab-active svg {
    opacity: 1;
}

/* Tab Panels
-------------------------------------- */

.b64-tab-panel {
    display: none;
    padding: 28px 24px;
}

.b64-tab-panel-active {
    display: block;
}

/* Labels
-------------------------------------- */

.b64-label {
    display: block;
    margin-bottom: 8px;
    font-family: var(--meta-family);
    font-size: var(--meta-fsize);
    font-weight: var(--meta-b-fweight, 600);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--body-fcolor);
}

/* Textareas
-------------------------------------- */

.b64-textarea-wrap {
    margin-bottom: 16px;
}

.b64-textarea-wrap:last-child {
    margin-bottom: 0;
}

.b64-textarea {
    display: block;
    width: 100%;
    padding: 14px 16px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.65;
    color: var(--headline-fcolor, #111);
    background: var(--b64-surface);
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.b64-textarea:focus {
    outline: none;
    border-color: color-mix(in srgb, var(--b64-accent) 50%, transparent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--b64-accent) 8%, transparent);
}

.b64-textarea-output {
    background: #f9f9fb;
    color: var(--headline-fcolor, #222);
    border-style: dashed;
}

.b64-textarea::placeholder {
    color: var(--body-fcolor, #999);
    opacity: 0.6;
}

.b64-textarea-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 6px;
    padding: 0 2px;
}

.b64-char-count {
    font-family: var(--meta-family);
    font-size: var(--meta-fsize, 0.75rem);
    font-weight: var(--meta-b-fweight, 600);
    color: var(--excerpt-color, #888);
    letter-spacing: 0.02em;
}

.b64-textarea-actions {
    display: flex;
    gap: 4px;
}

/* Icon Buttons
-------------------------------------- */

.b64-btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    color: var(--body-fcolor, #666);
    border: 1px solid transparent;
    border-radius: var(--b64-radius-sm);
    background: transparent;
    cursor: pointer;
    transition: var(--b64-transition);
}

.b64-btn-icon svg {
    width: 16px;
    height: 16px;
}

.b64-btn-icon:hover {
    color: var(--b64-accent);
    background: color-mix(in srgb, var(--b64-accent) 8%, transparent);
    border-color: color-mix(in srgb, var(--b64-accent) 20%, transparent);
}

/* Options
-------------------------------------- */

.b64-options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px 24px;
    margin-bottom: 16px;
    padding: 14px 18px;
    background: #f8f9fa;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
}

.b64-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--headline-fcolor, #333);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.b64-checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--b64-accent);
    cursor: pointer;
}

.b64-live-toggle {
    margin-left: auto;
}

.b64-live-indicator {
    display: inline-block;
    padding: 2px 8px;
    font-family: var(--meta-family);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: #fff;
    background: var(--b64-accent);
    border-radius: 10px;
    transition: var(--b64-transition);
}

.b64-live-indicator-off {
    background: var(--body-fcolor, #999);
}

/* Action Row
-------------------------------------- */

.b64-action-row {
    margin-bottom: 16px;
}

/* Buttons
-------------------------------------- */

.b64-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--btn-family);
    font-size: var(--btn-fsize, 12px);
    font-weight: var(--btn-fweight, 700);
    letter-spacing: 0.07em;
    text-transform: uppercase;
    border: 1px solid transparent;
    border-radius: var(--b64-radius-sm);
    cursor: pointer;
    transition: var(--b64-transition);
    white-space: nowrap;
    line-height: 1;
}

.b64-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.b64-btn-primary {
    color: #fff;
    background: var(--b64-accent);
    border-color: var(--b64-accent);
}

.b64-btn-primary:hover {
    background: var(--b64-accent-90);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--b64-accent) 30%, transparent);
}

.b64-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Error Display
-------------------------------------- */

.b64-error {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    margin-top: 12px;
    font-size: 0.88rem;
    font-weight: 500;
    color: #dc3545;
    background: rgba(220, 53, 69, 0.06);
    border: 1px solid rgba(220, 53, 69, 0.2);
    border-radius: var(--b64-radius);
}

.b64-error svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* File Drop Zone (Encode page)
-------------------------------------- */

.b64-file-drop {
    position: relative;
    padding: 48px 32px;
    text-align: center;
    border: 2.5px dashed var(--b64-accent);
    border-radius: var(--b64-radius);
    background: color-mix(in srgb, var(--b64-accent) 3%, var(--b64-surface));
    cursor: pointer;
    transition: var(--b64-transition);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--b64-accent) 6%, transparent);
    margin-bottom: 16px;
}

.b64-file-drop:hover,
.b64-file-drop.b64-dragover {
    border-color: var(--b64-accent);
    background: color-mix(in srgb, var(--b64-accent) 7%, var(--b64-surface));
    box-shadow: 0 0 0 6px color-mix(in srgb, var(--b64-accent) 10%, transparent),
        0 8px 32px color-mix(in srgb, var(--b64-accent) 12%, transparent);
}

.b64-file-drop.b64-dragover {
    border-style: solid;
    transform: scale(1.005);
}

.b64-file-drop-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    color: var(--b64-accent);
    border-radius: 50%;
    background: color-mix(in srgb, var(--b64-accent) 12%, transparent);
}

.b64-file-drop-icon svg {
    width: 28px;
    height: 28px;
}

.b64-file-drop-text {
    margin: 0 0 8px;
    font-size: 1.05rem;
    font-weight: var(--h4-fweight, 700);
}

.b64-file-browse {
    display: inline;
    padding: 0;
    font: inherit;
    font-weight: var(--h4-fweight, 700);
    color: var(--b64-accent);
    border: 0;
    background: transparent;
    cursor: pointer;
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

.b64-file-browse:hover {
    color: var(--b64-accent-90);
}

.b64-file-drop-hint {
    margin: 0;
    font-family: var(--meta-family);
    font-size: var(--meta-fsize);
    font-weight: var(--meta-b-fweight, 600);
    color: var(--b64-accent);
    opacity: 0.7;
}

/* File Info Bar
-------------------------------------- */

.b64-file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 16px;
    background: color-mix(in srgb, var(--b64-accent) 5%, var(--b64-surface));
    border: 1px solid color-mix(in srgb, var(--b64-accent) 20%, transparent);
    border-radius: var(--b64-radius);
}

.b64-file-info-details {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    min-width: 0;
}

.b64-file-info-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--headline-fcolor, #222);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 300px;
}

.b64-file-info-size,
.b64-file-info-type {
    font-family: var(--meta-family);
    font-size: var(--meta-fsize, 0.75rem);
    font-weight: var(--meta-b-fweight, 600);
    color: var(--b64-accent);
    background: color-mix(in srgb, var(--b64-accent) 10%, transparent);
    padding: 2px 10px;
    border-radius: 10px;
    white-space: nowrap;
}

/* File Preview (Decode page)
-------------------------------------- */

.b64-file-preview {
    margin-top: 16px;
}

.b64-file-preview-inner {
    padding: 16px;
    border: 1px solid var(--b64-border);
    border-radius: var(--b64-radius);
    background: #f8f9fa;
}

.b64-file-preview-label {
    display: inline-block;
    margin-bottom: 12px;
    font-family: var(--meta-family);
    font-size: var(--meta-fsize);
    font-weight: var(--meta-b-fweight, 600);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--b64-accent);
}

.b64-file-preview-content {
    text-align: center;
}

.b64-file-preview-content img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--b64-radius-sm);
    box-shadow: var(--b64-shadow);
}

.b64-file-preview-meta {
    margin-top: 10px;
    font-family: var(--meta-family);
    font-size: var(--meta-fsize, 0.75rem);
    color: var(--excerpt-color);
    text-align: center;
}

/* SEO Content
-------------------------------------- */

.b64-seo-content {
    margin-top: 54px;
    padding-top: 36px;
    border-top: 1px solid var(--b64-border);
}

/* FAQ Section (same patterns as HEIC converter)
-------------------------------------- */

.b64-faq {
    margin-top: 54px;
    padding-top: 36px;
    border-top: 1px solid var(--b64-border);
}

.b64-faq-inner {
    padding: 0;
}

.b64-faq-label {
    display: inline-block;
    margin-bottom: 6px;
    padding: 3px 12px;
    font-family: var(--meta-family);
    font-size: var(--meta-fsize);
    font-weight: var(--meta-b-fweight, 600);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--b64-accent);
    background: color-mix(in srgb, var(--b64-accent) 10%, transparent);
    border-radius: 20px;
}

.b64-faq-title {
    margin-bottom: 24px;
    font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.b64-faq-list {
    position: relative;
}

.b64-faq-item {
    border-bottom: 1px solid var(--b64-border);
}

.b64-faq-item:last-child {
    border-bottom: none;
}

.b64-faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 18px 0;
    text-align: left;
    color: inherit;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    gap: 20px;
    cursor: pointer;
}

.b64-faq-question:hover,
.b64-faq-question:focus {
    color: var(--b64-accent);
    background: transparent;
    box-shadow: none;
}

.b64-faq-question-text {
    font-family: var(--h4-family);
    font-size: clamp(1rem, 2vw, 1.125rem);
    font-weight: var(--h4-fweight, 700);
    line-height: 1.45;
}

.b64-faq-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    color: var(--b64-accent);
    border: 1px solid var(--b64-border);
    border-radius: 50%;
    background: color-mix(in srgb, var(--b64-accent) 8%, transparent);
    transition: var(--b64-transition);
}

.b64-faq-toggle svg {
    width: 14px;
    height: 14px;
    transition: transform 0.2s ease;
}

.b64-faq-item.b64-faq-open .b64-faq-toggle svg {
    transform: rotate(180deg);
}

.b64-faq-answer {
    display: none;
    padding-bottom: 18px;
}

.b64-faq-item.b64-faq-open .b64-faq-answer {
    display: block;
}

.b64-faq-item:first-child .b64-faq-answer {
    display: block;
}

.b64-faq-item:first-child .b64-faq-toggle svg {
    transform: rotate(180deg);
}

.b64-faq-item:first-child:not(.b64-faq-open):not(.b64-faq-touched) .b64-faq-answer {
    display: block;
}

.b64-faq-item:first-child:not(.b64-faq-open).b64-faq-touched .b64-faq-answer {
    display: none;
}

.b64-faq-item:first-child:not(.b64-faq-open).b64-faq-touched .b64-faq-toggle svg {
    transform: rotate(0deg);
}

.b64-faq-answer-inner {
    max-width: 840px;
    color: var(--excerpt-color);
    line-height: 1.7;
    font-size: 0.95rem;
}

.b64-faq-answer-inner p {
    margin: 0;
}

/* Toast Notifications
-------------------------------------- */

.b64-toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 100000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.b64-toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    background: var(--dark-accent, #191c20);
    border-radius: var(--b64-radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    pointer-events: auto;
    animation: b64ToastIn 0.3s ease;
}

.b64-toast.b64-toast-out {
    animation: b64ToastOut 0.25s ease forwards;
}

@keyframes b64ToastIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes b64ToastOut {
    to {
        opacity: 0;
        transform: translateY(10px);
    }
}

/* Responsive
-------------------------------------- */

@media (max-width: 1024px) {
    .b64-page {
        padding-top: 28px;
    }
}

@media (max-width: 767px) {
    .b64-page {
        padding: 18px 0 56px;
    }

    .b64-hero {
        padding: 24px 0 20px;
    }

    .b64-tab-panel {
        padding: 16px;
    }

    .b64-tab {
        padding: 12px 16px;
        font-size: 0.78rem;
    }

    .b64-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 12px 14px;
    }

    .b64-live-toggle {
        margin-left: 0;
    }

    .b64-file-drop {
        padding: 32px 16px;
    }

    .b64-file-info-name {
        max-width: 160px;
    }

    .b64-seo-content {
        margin-top: 42px;
    }

    .b64-faq {
        margin-top: 42px;
    }

    .b64-faq-question {
        gap: 14px;
    }

    .b64-toast-container {
        bottom: 12px;
        right: 12px;
        left: 12px;
    }
}