:root {
    color-scheme: light;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --background: #fafafa;
    --surface: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --font-text: "LXGW WenKai Screen", ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "LXGW WenKai Mono Screen", ui-monospace, "SFMono-Regular", Consolas, monospace;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);
}

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

[hidden] {
    display: none !important;
}

html {
    min-width: 320px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    background: var(--background);
    color: var(--text);
    font-family: var(--font-text);
    line-height: 1.4;
    text-rendering: optimizeLegibility;
}

button,
input,
textarea {
    font: inherit;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.app-shell {
    width: 100%;
    max-width: 480px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.app-header {
    padding: 20px 24px 12px;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.app-header h1 {
    margin-bottom: 8px;
    color: var(--text);
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.2;
}

.workspace {
    padding: 16px 24px 20px;
}

.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.tab {
    flex: 1;
    padding: 12px 16px;
    border: 0;
    border-bottom: 2px solid transparent;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.tab:hover,
.tab.active {
    background: rgba(37, 99, 235, .05);
}

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

.tab.active {
    border-bottom-color: var(--primary);
    color: var(--primary);
}

.tab-panel form {
    margin-bottom: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    color: var(--text);
    font-size: 14px;
    text-align: justify;
    transition: border-color .2s ease, box-shadow .2s ease;
}

.input-group textarea {
    min-height: 90px;
    resize: none;
    line-height: 1.4;
    scrollbar-width: none;
}

.input-group textarea::-webkit-scrollbar {
    display: none;
}

.input-group input::placeholder,
.input-group textarea::placeholder {
    color: var(--text-muted);
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .1);
}

.input-group button {
    padding: 12px 20px;
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #ffffff;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background .2s ease, transform .2s ease;
}

.input-group button:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.input-group button:disabled {
    cursor: not-allowed;
    opacity: .6;
}

.result {
    margin-top: 6px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #f8fafc;
}

.result-item {
    margin-bottom: 12px;
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-item label {
    display: block;
    margin-bottom: 6px;
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
}

.url-display {
    display: flex;
    align-items: center;
    gap: 8px;
}

.url-display input {
    min-width: 0;
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 13px;
}

.copy-button {
    padding: 10px 16px;
    border: 0;
    border-radius: 6px;
    background: #059669;
    color: #ffffff;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background .2s ease;
}

.copy-button:hover {
    background: #047857;
}

.copy-button.copied {
    background: #0891b2;
}

.result-time {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--text-muted);
    font-size: 13px;
}

.error-message {
    margin-top: 16px;
    padding: 12px 16px;
    border: 1px solid #fecaca;
    border-radius: 8px;
    background: #fef2f2;
    color: #dc2626;
    font-size: 14px;
}

@media (max-width: 640px) {
    body {
        padding: 16px;
    }

    .app-header {
        padding: 24px 24px 20px;
    }

    .app-header h1 {
        font-size: 1.5rem;
    }

    .workspace {
        padding: 20px 24px 24px;
    }

    .url-display {
        flex-direction: column;
        align-items: stretch;
    }

    .copy-button {
        width: fit-content;
        align-self: flex-end;
    }
}