:root {
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #16202a;
    --muted: #5b6b7a;
    --primary: #0f5cc0;
    --accent: #0e9f6e;
    --border: #d9e0ea;
    --danger: #b73636;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top right, #e4eefb, var(--bg) 40%);
    color: var(--text);
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: linear-gradient(120deg, #0d407f, #0f5cc0);
    color: #fff;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.4px;
}

.nav {
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav a {
    color: #fff;
    text-decoration: none;
    font-size: 14px;
}

.main {
    max-width: 1100px;
    margin: 20px auto;
    padding: 0 14px 30px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 14px;
}

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

.stack {
    display: grid;
    gap: 10px;
}

label {
    color: var(--muted);
    font-size: 13px;
    display: grid;
    gap: 6px;
}

input, select {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
    background: #fff;
    color: var(--text);
}

.btn {
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
}

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

.btn.ghost {
    background: transparent;
    border-color: #c6d4e7;
    color: var(--text);
}

.timeline-list {
    display: grid;
    gap: 12px;
}

.tweet {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
}

.tweet-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 13px;
}

.tweet-zh {
    white-space: pre-wrap;
    line-height: 1.55;
}

.tweet-origin {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px dashed var(--border);
    color: #3f5368;
    white-space: pre-wrap;
}

.badge {
    padding: 2px 8px;
    border-radius: 999px;
    background: #eaf1fc;
    color: #114d98;
    font-size: 12px;
}

.badge.fail {
    background: #fde9e9;
    color: var(--danger);
}

.analysis-box {
    margin-top: 10px;
    background: #f1f7ff;
    border: 1px solid #d8e6fb;
    border-radius: 8px;
    padding: 8px;
    white-space: pre-wrap;
}

.grid-two {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

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

.item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
}

.pager {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin: 12px 0 0;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
}

.login-card {
    width: min(420px, 92vw);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px;
}

.error {
    color: var(--danger);
    margin: 0;
    min-height: 20px;
}

@media (max-width: 900px) {
    .grid-two {
        grid-template-columns: 1fr;
    }
}