/* 云海教育 · 登录页 —— 方案三（薄荷浅绿）主题 */
:root {
    /* 背景渐变 */
    --bg-from: #EFF9F2;
    --bg-to: #D3EDDF;

    /* 文字 */
    --text-strong: #163A2A;
    --text-muted: #416C55;
    --text-link: #8A95A5;
    --text-weak: #B0B8C4;

    /* 强调色 */
    --accent: #2FA36A;
    --accent-hover: #279057;
    --brand-green: #6DBE45;
    --wave: #2FA36A;

    /* 卡片与表单 */
    --card-bg: #FFFFFF;
    --card-shadow: 0 12px 32px rgba(15, 45, 35, .12);
    --input-bg: #F4F6FA;
    --input-text: #1E2A3A;
    --border: #E3E8F0;
    --placeholder: #A8B2C0;

    /* 尺寸 */
    --card-width: 380px;
    --radius-card: 18px;
    --radius-input: 8px;
}

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

html,
body {
    height: 100%;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system,
        BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    background: linear-gradient(160deg, var(--bg-from) 0%, var(--bg-to) 100%);
    color: var(--text-strong);
}

.login-wrap {
    display: flex;
    min-height: 100vh;
    background: linear-gradient(160deg, var(--bg-from) 0%, var(--bg-to) 100%);
}

/* 左侧品牌区 */
.login-banner {
    flex: 0 0 46%;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 24px 7% 140px;
    overflow: hidden;
}

.banner-inner {
    position: relative;
    z-index: 1;
    max-width: 480px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 88px;
}

.brand-logo {
    width: 54px;
    height: 54px;
    object-fit: contain;
}

.brand-name {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-strong);
}

.brand-slogan {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--brand-green);
}

.banner-title {
    font-size: 46px;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 2px;
    color: var(--text-strong);
    margin-bottom: 20px;
}

.banner-desc {
    font-size: 19px;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 48px;
}

.banner-points {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.banner-points li {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 22px;
    color: var(--text-muted);
}

.feature__check {
    flex: 0 0 26px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-size: 14px;
    line-height: 26px;
    text-align: center;
}

/* 底部波浪装饰（呼应 logo 波浪元素） */
.banner-wave {
    position: absolute;
    left: 0;
    bottom: 24px;
    width: 100%;
    height: 180px;
    pointer-events: none;
}

.banner-footer {
    position: absolute;
    left: 7%;
    right: 7%;
    bottom: 12px;
    z-index: 1;
    font-size: 12px;
    color: var(--text-muted);
    opacity: 0.7;
}

/* 右侧登录区 */
.login-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
}

.login-card {
    width: var(--card-width);
    max-width: 100%;
    background: var(--card-bg);
    border-radius: var(--radius-card);
    box-shadow: var(--card-shadow);
    padding: 46px 40px 40px;
}

.login-title {
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    color: var(--text-strong);
    margin-bottom: 30px;
}

.form-item {
    margin-bottom: 24px;
}

.form-item input {
    width: 100%;
    height: 54px;
    padding: 0 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-input);
    font-size: 17px;
    font-family: inherit;
    color: var(--input-text);
    background: var(--input-bg);
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
}

.form-item input::placeholder {
    color: var(--placeholder);
}

.form-item input:focus {
    border-color: var(--accent);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(47, 163, 106, 0.12);
}

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

.captcha-row input {
    flex: 1;
}

.captcha-row img {
    height: 46px;
    cursor: pointer;
    border-radius: var(--radius-input);
    border: 1px solid var(--border);
}

.btn-submit {
    width: 100%;
    height: 56px;
    margin-top: 8px;
    border: none;
    border-radius: var(--radius-input);
    font-size: 20px;
    font-weight: 700;
    font-family: inherit;
    letter-spacing: 4px;
    color: #fff;
    cursor: pointer;
    background: var(--accent);
    box-shadow: 0 6px 16px rgba(47, 163, 106, 0.28);
    transition: background 0.18s, box-shadow 0.2s, transform 0.1s;
}

.btn-submit:hover {
    background: var(--accent-hover);
    box-shadow: 0 8px 22px rgba(47, 163, 106, 0.38);
}

.btn-submit:active {
    transform: translateY(1px);
}

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    box-shadow: none;
}

.warning {
    color: #f56c6c;
    font-size: 13px;
    margin-top: 14px;
    text-align: center;
    min-height: 20px;
}

/* 移动端：隐藏品牌区，卡片居中 */
@media (max-width: 860px) {
    .login-banner {
        display: none;
    }

    .login-wrap {
        background: linear-gradient(160deg, var(--bg-from), var(--bg-to));
    }

    .login-card {
        box-shadow: 0 14px 32px rgba(15, 45, 35, 0.18);
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 32px 24px 30px;
    }
}