:root {
    --bg: #ebe7df;
    --bg-line: rgba(44, 42, 38, 0.06);
    --paper: #f7f5f0;
    --ink: #2c2a26;
    --ink-soft: #5c5850;
    --ink-muted: #8a8478;
    --line: #d8d3c8;
    --accent: #3d6b59;
    --accent-hover: #2f5546;
    --accent-2: #b85c38;
    --err: #a33b2a;
    --err-bg: #f8ebe8;
    --shadow: 0 1px 0 rgba(44, 42, 38, 0.04), 0 8px 24px rgba(44, 42, 38, 0.06);
    --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    color: var(--ink);
    background-color: var(--bg);
    background-image:
        linear-gradient(var(--bg-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-line) 1px, transparent 1px);
    background-size: 24px 24px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
}

.page {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 20px 48px;
}

.head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
}

.head-back {
    font-family: var(--mono);
    font-size: 0.8125rem;
    color: var(--ink-muted);
    margin-bottom: 8px;
    display: inline-block;
}

.head h1 {
    margin: 0 0 6px;
    font-size: 1.5rem;
    font-weight: 600;
}

.head p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--ink-soft);
    line-height: 1.5;
}

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 0;
}

.tab {
    font-family: var(--font);
    font-size: 0.875rem;
    padding: 10px 16px;
    border: none;
    background: none;
    color: var(--ink-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.12s, border-color 0.12s;
}

.tab:hover {
    color: var(--ink);
}

.tab.is-active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 500;
}

.panel {
    display: none;
}

.panel.is-active {
    display: block;
}

.card {
    background: var(--paper);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
}

.card-title {
    font-size: 0.8125rem;
    font-family: var(--mono);
    color: var(--ink-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin: 0 0 14px;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    align-items: center;
    margin-bottom: 14px;
}

.toolbar-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.toolbar-group + .toolbar-group {
    padding-left: 16px;
    border-left: 1px solid var(--line);
}

@media (max-width: 560px) {
    .toolbar-group + .toolbar-group {
        padding-left: 0;
        border-left: none;
        width: 100%;
    }
}

.chk {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    color: var(--ink-soft);
    cursor: pointer;
    user-select: none;
}

.chk input {
    accent-color: var(--accent);
}

.mode-switch {
    display: inline-flex;
    border: 1px solid var(--line);
    border-radius: 4px;
    overflow: hidden;
}

.mode-btn {
    font-family: var(--mono);
    font-size: 0.8125rem;
    padding: 6px 14px;
    border: none;
    background: var(--bg);
    color: var(--ink-soft);
    cursor: pointer;
}

.mode-btn.is-active {
    background: var(--accent);
    color: #fff;
}

.btn {
    font-family: var(--font);
    font-size: 0.8125rem;
    padding: 7px 14px;
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink);
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.12s, border-color 0.12s;
}

.btn:hover {
    border-color: #c4bfb4;
    background: var(--bg);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-ghost {
    background: transparent;
}

.io-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 720px) {
    .io-grid {
        grid-template-columns: 1fr;
    }
}

.io-block label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--ink-muted);
    margin-bottom: 6px;
}

.io-meta {
    font-weight: 400;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 12px 14px;
    font-family: var(--mono);
    font-size: 0.8125rem;
    line-height: 1.55;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: #fff;
    color: var(--ink);
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(61, 107, 89, 0.15);
}

textarea[readonly] {
    background: var(--bg);
}

.dropzone {
    border: 1px dashed var(--line);
    border-radius: 4px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover,
.dropzone.is-dragover {
    border-color: var(--accent);
    background: rgba(61, 107, 89, 0.04);
}

.dropzone p {
    margin: 0 0 4px;
    font-size: 0.875rem;
    color: var(--ink-soft);
}

.dropzone span {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--ink-muted);
}

.dropzone input {
    display: none;
}

.preview-box {
    margin-top: 16px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: var(--bg);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-box img {
    max-width: 100%;
    max-height: 280px;
    object-fit: contain;
}

.preview-empty {
    font-size: 0.8125rem;
    color: var(--ink-muted);
}

.file-info {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--ink-muted);
    margin-top: 10px;
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    padding: 10px 18px;
    font-size: 0.8125rem;
    background: var(--ink);
    color: var(--paper);
    border-radius: 4px;
    opacity: 0;
    transition: transform 0.2s, opacity 0.2s;
    pointer-events: none;
    z-index: 100;
}

.toast.is-show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.err-bar {
    display: none;
    margin-top: 12px;
    padding: 10px 14px;
    font-size: 0.8125rem;
    color: var(--err);
    background: var(--err-bg);
    border-left: 3px solid var(--err);
}

.err-bar.is-show {
    display: block;
}

.hint {
    font-size: 0.75rem;
    color: var(--ink-muted);
    margin-top: 12px;
    line-height: 1.5;
}

.split-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}