:root {
    --color-fg-default: #1f2328;
    --color-fg-muted: #656d76;
    --color-fg-subtle: #6e7781;
    --color-fg-on-emphasis: #ffffff;
    --color-bg-default: #ffffff;
    --color-bg-subtle: #f6f8fa;
    --color-bg-inset: #eff2f5;
    --color-border-default: #d0d7de;
    --color-border-muted: #d8dee4;
    --color-accent-fg: #0969da;
    --color-accent-emphasis: #0969da;
    --color-success-fg: #1a7f37;
    --color-success-emphasis: #1f883d;
    --color-success-subtle: #dafbe1;
    --color-danger-fg: #d1242f;
    --color-danger-subtle: #ffebe9;
    --color-attention-fg: #9a6700;
    --color-attention-subtle: #fff8c5;
    --color-info-subtle: #ddf4ff;
    --color-info-fg: #0969da;
    --color-neutral-emphasis: #6e7781;
    --color-header-bg: #24292f;
    --color-header-fg: #ffffff;
    --color-btn-primary-bg: #1f883d;
    --color-btn-primary-hover: #1a7f37;
    --color-btn-primary-disabled: #94d3a2;
    --shadow-sm: 0 1px 0 rgba(31,35,40,0.04);
    --shadow-md: 0 3px 6px rgba(140,149,159,0.15);
    --radius-sm: 6px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-fg-default);
    background: var(--color-bg-subtle);
    min-height: 100vh;
}

code {
    padding: 0.2em 0.4em;
    font-size: 85%;
    background: rgba(175,184,193,0.2);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

.top-bar {
    background: var(--color-header-bg);
    color: var(--color-header-fg);
    padding: 0 24px;
    height: 48px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-bar-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
}

.logo { color: var(--color-header-fg); }

.top-bar-title {
    font-weight: 600;
    font-size: 16px;
    letter-spacing: -0.01em;
}

.main { padding: 32px 24px 64px; }

.container {
    max-width: 768px;
    margin: 0 auto;
}

.page-header { margin-bottom: 24px; }

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-fg-default);
    letter-spacing: -0.02em;
}

.page-desc {
    color: var(--color-fg-muted);
    font-size: 14px;
    margin-top: 4px;
}

.box {
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    background: var(--color-bg-default);
    box-shadow: var(--shadow-sm);
}

.box-header {
    padding: 12px 16px;
    font-weight: 600;
    font-size: 14px;
    background: var(--color-bg-subtle);
    border-bottom: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.box-body { padding: 16px; }

.box-footer {
    padding: 16px;
    border-top: 1px solid var(--color-border-default);
    background: var(--color-bg-subtle);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.form-group { margin-bottom: 16px; }
.form-group:last-child { margin-bottom: 0; }

label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
    color: var(--color-fg-default);
}

.optional {
    font-weight: 400;
    color: var(--color-fg-muted);
}

.hint {
    display: block;
    font-size: 12px;
    color: var(--color-fg-muted);
    margin-top: 4px;
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 5px 12px;
    font-size: 14px;
    line-height: 20px;
    color: var(--color-fg-default);
    background: var(--color-bg-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 1px 0 rgba(208,215,222,0.2);
    font-family: inherit;
    transition: border-color 80ms ease-in, box-shadow 80ms ease-in;
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent-fg);
    box-shadow: 0 0 0 3px rgba(9,105,218,0.3);
}

textarea { resize: vertical; }

.divider {
    border: none;
    border-top: 1px solid var(--color-border-muted);
    margin: 16px 0;
}

.hidden { display: none !important; }

.segmented-control {
    display: inline-flex;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-bg-subtle);
}

.seg-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    line-height: 20px;
    border: none;
    background: transparent;
    color: var(--color-fg-muted);
    cursor: pointer;
    transition: background 80ms, color 80ms;
    white-space: nowrap;
}

.seg-btn + .seg-btn {
    border-left: 1px solid var(--color-border-default);
}

.seg-btn:hover {
    background: var(--color-bg-default);
    color: var(--color-fg-default);
}

.seg-btn.active {
    background: var(--color-bg-default);
    color: var(--color-fg-default);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.pr-options {
    padding: 12px;
    margin-top: 8px;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-sm);
    background: var(--color-bg-subtle);
}

.pr-options .form-group { margin-bottom: 12px; }
.pr-options .form-group:last-child { margin-bottom: 0; }

.file-drop {
    position: relative;
    border: 2px dashed var(--color-border-default);
    border-radius: var(--radius-sm);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: border-color 120ms, background 120ms;
}

.file-drop:hover,
.file-drop.dragover {
    border-color: var(--color-accent-fg);
    background: rgba(9,105,218,0.04);
}

.file-drop input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-drop-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-fg-muted);
    pointer-events: none;
    font-size: 14px;
}

.file-drop-label svg { color: var(--color-fg-subtle); }

.file-drop-label.has-file {
    color: var(--color-fg-default);
    font-weight: 500;
}

.coauthor-details {
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.coauthor-summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    background: var(--color-bg-subtle);
    color: var(--color-fg-default);
    list-style: none;
    transition: background 80ms;
}

.coauthor-summary::-webkit-details-marker { display: none; }

.coauthor-summary:hover { background: var(--color-bg-inset); }

.coauthor-summary .chevron {
    margin-left: auto;
    transition: transform 200ms ease;
    color: var(--color-fg-muted);
}

.coauthor-details[open] .coauthor-summary .chevron {
    transform: rotate(180deg);
}

.coauthor-count {
    font-size: 12px;
    font-weight: 600;
    background: var(--color-accent-emphasis);
    color: var(--color-fg-on-emphasis);
    padding: 0 6px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
    line-height: 18px;
    display: none;
}

.coauthor-count.visible { display: inline-block; }

.coauthor-panel { padding: 12px; }

.coauthor-search {
    margin-bottom: 10px;
}

.coauthor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 6px;
    max-height: 280px;
    overflow-y: auto;
}

.coauthor-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    cursor: pointer;
    user-select: none;
    transition: background 80ms, border-color 80ms;
    font-size: 12px;
}

.coauthor-item:hover { background: var(--color-bg-subtle); }

.coauthor-item.selected {
    border-color: var(--color-accent-fg);
    background: rgba(9,105,218,0.06);
}

.coauthor-item.filter-hidden { display: none; }

.coauthor-item input[type="checkbox"] {
    accent-color: var(--color-accent-fg);
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.coauthor-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-bg-inset);
    flex-shrink: 0;
}

.coauthor-login {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-fg-default);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 5px 16px;
    font-size: 14px;
    font-weight: 600;
    line-height: 20px;
    color: var(--color-fg-on-emphasis);
    background: var(--color-btn-primary-bg);
    border: 1px solid rgba(31,35,40,0.15);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    transition: background 80ms;
    box-shadow: var(--shadow-sm);
}

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

.btn-primary:disabled {
    background: var(--color-btn-primary-disabled);
    cursor: not-allowed;
}

.btn-primary svg { flex-shrink: 0; }

.log-container {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.log-entry {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    line-height: 1.5;
    word-break: break-word;
    display: flex;
    align-items: baseline;
    gap: 6px;
    border: 1px solid transparent;
}

.log-entry strong { flex-shrink: 0; }

.log-entry a {
    color: inherit;
    text-decoration: underline;
}

.log-info {
    background: var(--color-info-subtle);
    color: var(--color-info-fg);
    border-color: rgba(84,174,255,0.4);
}

.log-success {
    background: var(--color-success-subtle);
    color: var(--color-success-fg);
    border-color: rgba(74,194,107,0.4);
}

.log-error {
    background: var(--color-danger-subtle);
    color: var(--color-danger-fg);
    border-color: rgba(255,129,130,0.4);
}

.log-warn {
    background: var(--color-attention-subtle);
    color: var(--color-attention-fg);
    border-color: rgba(212,167,44,0.4);
}

.progress-bar-track {
    height: 4px;
    background: var(--color-bg-inset);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 16px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--color-btn-primary-bg);
    border-radius: 2px;
    transition: width 300ms ease;
    width: 0%;
}

@media (max-width: 600px) {
    .main { padding: 16px 12px 48px; }
    .box-body, .box-footer { padding: 12px; }
    .coauthor-grid { grid-template-columns: 1fr; }
    .segmented-control { width: 100%; }
    .seg-btn { flex: 1; justify-content: center; }
}