/* ====== Reset & Base ====== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #f1f5f9;
    color: #1e293b;
    font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
    line-height: 1.6;
    padding: 40px 20px;
}

html, body {
    height: 100%;
}

/* ====== Container ====== */
.container {
    max-width: 1400px;
    margin: 0 auto;
}

.container-narrow {
    max-width: 600px;
    margin: 0 auto;
}

/* ====== Typography ====== */
h1 {
    text-align: center;
    color: #0f172a;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 32px;
    letter-spacing: 2px;
}

h1.small {
    font-size: 24px;
}

/* ====== Buttons ====== */
.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 28px;
}

.btn-group.center {
    justify-content: center;
}

.btn {
    flex: 1;
    padding: 12px;
    border: 1px solid #0284c7;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    font-family: inherit;
    background-color: #ffffff;
    color: #0284c7;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: #f0f9ff;
}

.btn-primary {
    background-color: #0284c7;
    color: #ffffff;
    border-color: #0284c7;
}

.btn-primary:hover {
    background-color: #0369a1;
    border-color: #0369a1;
}

/* ====== Cards ====== */
.card {
    background-color: #ffffff;
    border: 1px solid #cbd5e1;
    padding: 40px 32px;
    margin-bottom: 24px;
    text-align: center;
}

/* ====== Footer ====== */
.footer {
    text-align: center;
    color: #94a3b8;
    font-size: 12px;
    margin-top: 40px;
}

/* ====== Error message ====== */
.error-msg {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 14px;
    text-align: center;
}

/* ====== Notes / Disclaimer ====== */
.note, .disclaimer {
    font-size: 13px;
    color: #64748b;
    line-height: 1.8;
    margin-bottom: 16px;
    padding: 12px 16px;
    background-color: #f8fafc;
    border-left: 3px solid #94a3b8;
}