/**
 * auth.css —— 青莲居 · 水墨风登录注册
 * 保留原页面全部 DOM 结构与 ID，仅更换视觉（宣纸卡片 / 墨按钮 / 竹叶背景）
 */
:root {
    --color-primary: #3f6b35;
    --color-primary-dark: #2a4a24;
    --color-background: #f6f0e2;
    --color-surface: rgba(255, 253, 246, 0.92);
    --color-text: #1f1a17;
    --color-text-light: #6b5f55;
    --color-border: rgba(63, 107, 53, 0.35);
    --color-error: #b03a2e;
    --shadow-lg: 0 18px 44px rgba(31, 26, 23, 0.22);
    --shadow-sm: 0 3px 10px rgba(31, 26, 23, 0.1);
    --radius-lg: 14px;
    --radius-md: 10px;
    --radius-sm: 6px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'STKaiti', 'KaiTi', '华文楷体', 'Songti SC', 'SimSun', 'Segoe UI', serif;
}

/* 竹影宣纸背景 */
body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        var(--mountains-ink),
        linear-gradient(180deg, #fbf7ec 0%, #f0e7d0 100%);
    background-size: cover, cover;
    background-repeat: no-repeat, no-repeat;
    background-position: bottom center, center;
    padding: 1.5rem;
    position: relative;
    overflow-x: hidden;
}

/* 两侧竹影 */
body::before, body::after {
    content: '';
    position: fixed;
    top: 0;
    bottom: 0;
    width: 11px;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(90deg, #2a4a24 0%, #5c8a4e 35%, #2a4a24 70%, #1d3519 100%);
    border-radius: 8px;
    box-shadow: 0 0 18px rgba(42, 74, 36, 0.25);
}
body::before { left: 5vw; }
body::after { right: 5vw; }
@media (max-width: 720px) { body::before, body::after { display: none; } }

.glass-card {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 460px;
    background:
        var(--grain-light),
        linear-gradient(165deg, #fffdf6, #f2ead6);
    border: 1px solid rgba(154, 138, 109, 0.55);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: none;
    padding: 2.4rem 2.2rem 2.2rem;
    animation: cardIn 0.7s cubic-bezier(0.2, 1, 0.3, 1) both;
}
@keyframes cardIn {
    from { opacity: 0; transform: translateY(26px); }
    to { opacity: 1; transform: translateY(0); }
}

.header { text-align: center; margin-bottom: 1.8rem; }
.logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 0.9rem;
    border-radius: 8px;
    background: linear-gradient(160deg, #c14a3a, #8e2b21);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-4deg);
    box-shadow: 0 5px 14px rgba(142, 43, 33, 0.4);
    font-family: 'STXingkai', '华文行楷', 'KaiTi', serif;
    font-size: 1.6rem;
    color: #f7ead6;
    border: 1.5px solid #f7ead6;
}
.logo i { display: none; }
.logo::after { content: '青莲'; }
.header h1 {
    font-size: 1.7rem;
    letter-spacing: 6px;
    color: var(--color-text);
    font-weight: 400;
}
.subtitle {
    margin-top: 0.5rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
    letter-spacing: 1px;
}

/* 标签页 */
.tabs {
    position: relative;
    display: flex;
    margin-bottom: 1.8rem;
    border-bottom: 1px solid rgba(63, 107, 53, 0.3);
}
.tab {
    flex: 1;
    text-align: center;
    padding: 0.65rem 0;
    cursor: pointer;
    color: var(--color-text-light);
    letter-spacing: 4px;
    font-size: 1.05rem;
    transition: var(--transition);
    user-select: none;
}
.tab.active { color: var(--color-primary-dark); font-weight: bold; }
.tab-slider {
    position: absolute;
    bottom: -1px;
    height: 3px;
    width: 50%;
    background: linear-gradient(90deg, var(--color-primary), var(--gold, #c9a86a));
    border-radius: 3px;
    transition: var(--transition);
}

/* 表单切换：仅当前激活的标签页可见 */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* 表单 */
.form-group { margin-bottom: 1.1rem; }
.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
    letter-spacing: 2px;
    color: var(--color-text);
}
.input-with-icon { position: relative; }
.input-with-icon i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-primary);
    font-size: 0.9rem;
    font-style: normal;
    z-index: 2;
}
.input-with-icon i::before { content: ''; }
.form-control {
    width: 100%;
    padding: 0.7rem 1rem 0.7rem 2.3rem;
    font-size: 1rem;
    letter-spacing: 1px;
    color: var(--color-text);
    background: rgba(255, 253, 246, 0.8);
    border: 1px solid rgba(63, 107, 53, 0.4);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
    border-bottom-width: 2px;
}
.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(63, 107, 53, 0.12);
}
.form-control::placeholder { color: rgba(107, 95, 85, 0.6); }

.code-group { display: flex; gap: 0.6rem; }
.code-group .code-input { flex: 1; }
.btn-send-code {
    padding: 0 1.1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-primary);
    background: rgba(63, 107, 53, 0.1);
    color: var(--color-primary-dark);
    font-size: 0.95rem;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-send-code:hover:not(:disabled) { background: var(--color-primary); color: #f4f6ea; }
.btn-send-code:disabled { opacity: 0.55; cursor: not-allowed; }

/* 墨色主按钮 */
.btn-submit {
    width: 100%;
    margin-top: 0.8rem;
    padding: 0.8rem 0;
    border-radius: var(--radius-sm);
    border: 1px solid #050403;
    background: linear-gradient(160deg, #2b2622, #171310);
    color: #f4ecd9;
    font-size: 1.1rem;
    letter-spacing: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 5px 14px rgba(31, 26, 23, 0.3);
}
.btn-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -40%;
    width: 30%;
    height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.14), transparent);
    transform: skewX(-20deg);
    transition: left 0.5s;
}
.btn-submit:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(31, 26, 23, 0.38); }
.btn-submit:hover:not(:disabled)::before { left: 120%; }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-text { letter-spacing: 4px; }

.text-error { color: var(--color-error); }

/* 返回首页 */
.back-home {
    display: block;
    margin-top: 1.2rem;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.95rem;
    letter-spacing: 2px;
    text-decoration: none;
    transition: var(--transition);
}
.back-home:hover { color: var(--color-primary-dark); }