/**
 * 小火把 — 登录 / 注册页样式  v3.0.0
 *
 * 与全站 site.css 同源：冷调科技中性色 + 火色焦点 + 极光暗场。
 * 只重写视觉，不改任何类名与结构，auth.js 零改动。
 */

/* ================================================================
   1. 设计令牌
   ================================================================ */
:root {
    --g-bg:        #07080D;
    --g-surface:   #FFFFFF;
    --g-ink:       #0B0D14;
    --g-ink-2:     #545A68;
    --g-ink-3:     #868C99;
    --g-line:      #E4E7EE;
    --g-line-2:    #D7DBE4;
    --g-brand:     #FF4A1C;
    --g-brand-hov: #E63C0F;
    --g-brand-bg:  #FFF1EB;
    --g-red:       #A62A2A;
    --r-sm:        6px;
    --r-md:        8px;
    --r-lg:        14px;

    /* 兼容旧变量名，防止残留引用掉色 */
    --bg-body:      var(--g-bg);
    --bg-body-end:  var(--g-bg);
    --bg-surface:   var(--g-surface);
    --bg-hint:      #F7F8FB;
    --text-heading: var(--g-ink);
    --text-main:    var(--g-ink-2);
    --text-muted:   var(--g-ink-3);
    --primary:      var(--g-brand);
    --primary-end:  var(--g-brand-hov);
    --border-light: var(--g-line);
    --error:       var(--g-red);
    --radius-md:   var(--r-sm);
    --radius-lg:   var(--r-lg);
    --shadow-modal: 0 30px 80px -24px rgba(7, 8, 13, .75);
}

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

/* ================================================================
   2. 页面（暗场极光，与首页首屏同源）
   ================================================================ */
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--g-ink);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    -webkit-font-smoothing: antialiased;
    background:
        radial-gradient(70% 55% at 84% -6%, rgba(255, 74, 28, .30) 0%, rgba(255, 90, 40, .10) 46%, rgba(255, 74, 28, 0) 70%),
        radial-gradient(90% 70% at 6% 112%, rgba(255, 122, 60, .14) 0%, rgba(255, 122, 60, 0) 55%),
        radial-gradient(120% 90% at 50% 0%, #15161D 0%, rgba(7, 8, 13, 0) 62%),
        var(--g-bg);
    background-attachment: fixed;
}

/* ================================================================
   3. 卡片
   ================================================================ */
.auth-container {
    background: var(--g-surface);
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: var(--r-lg);
    box-shadow: 0 40px 90px -40px rgba(0, 0, 0, .85), 0 2px 10px rgba(0, 0, 0, .25);
    width: 100%;
    max-width: 424px;
    padding: 40px 40px 36px;
}

/* ================================================================
   4. 品牌区
   ================================================================ */
.logo {
    text-align: center;
    margin-bottom: 28px;
}

/* 纯 CSS 绘制品牌方块 + 火焰图形，不依赖图片资源 */
.logo::before {
    content: "";
    display: block;
    width: 46px;
    height: 46px;
    margin: 0 auto 14px;
    border-radius: 12px;
    background-color: var(--g-brand);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2c.5 3.1-1.6 4.2-1.6 6.4 0 1.3 1 2.2 2.2 2.2 1.4 0 2.3-1.3 2-3 2.2 1.7 3.4 3.8 3.4 6.2 0 3.6-3.1 6.2-6 6.2S6 17.4 6 13.8C6 9.6 9.5 6.9 12 2z' fill='%23fff'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 24px;
    box-shadow: 0 10px 26px -8px rgba(255, 74, 28, .7);
}

.logo h1 {
    font-size: 23px;
    font-weight: 800;
    letter-spacing: -.03em;
    color: var(--g-ink);
    margin-bottom: 6px;
}

.logo p {
    font-size: 13px;
    font-weight: 400;
    color: var(--g-ink-2);
}

/* ================================================================
   5. 登录 / 注册切换
   ================================================================ */
.tabs {
    display: flex;
    gap: 28px;
    border-bottom: 1px solid var(--g-line);
    margin-bottom: 24px;
}

.tab {
    position: relative;
    padding: 0 2px 12px;
    font-size: 14px;
    color: var(--g-ink-2);
    cursor: pointer;
    user-select: none;
    transition: color .15s;
}

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

.tab.active {
    color: var(--g-brand-hov);
    font-weight: 600;
}

.tab.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    border-radius: 2px 2px 0 0;
    background: var(--g-brand);
}

/* ================================================================
   6. 表单
   ================================================================ */
.form-container { display: none; }
.form-container.active { display: block; }

.form-group { margin-bottom: 18px; }

.form-group > label:not(.agreement-label) {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--g-ink-2);
    margin-bottom: 7px;
}

.form-group input:not([type="checkbox"]) {
    width: 100%;
    height: 44px;
    padding: 0 13px;
    font-size: 14px;
    font-family: inherit;
    color: var(--g-ink);
    background: var(--g-surface);
    border: 1px solid var(--g-line-2);
    border-radius: var(--r-sm);
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

.form-group input::placeholder { color: var(--g-ink-3); }

.form-group input:not([type="checkbox"]):hover { border-color: #B4B9C4; }

.form-group input:not([type="checkbox"]):focus {
    border-color: var(--g-brand);
    box-shadow: 0 0 0 3px rgba(255, 74, 28, .13);
}

/* ================================================================
   7. 错误提示
   ================================================================ */
.error-message {
    font-size: 12px;
    line-height: 1.5;
    color: var(--g-red);
    margin-top: 6px;
}

.error-message:empty { display: none; }

/* ================================================================
   8. 主按钮
   ================================================================ */
.btn-submit {
    width: 100%;
    height: 44px;
    margin-top: 6px;
    border: 0;
    border-radius: var(--r-sm);
    background: var(--g-brand);
    color: #fff;
    font-family: inherit;
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, box-shadow .15s, transform .1s;
    box-shadow: 0 12px 28px -12px rgba(255, 74, 28, .7);
}

.btn-submit:hover { background: var(--g-brand-hov); }
.btn-submit:active { transform: translateY(1px); box-shadow: none; }

.btn-submit:disabled {
    background: #E4E7EE;
    color: var(--g-ink-3);
    cursor: not-allowed;
    box-shadow: none;
}

/* ================================================================
   9. 协议勾选
   ================================================================ */
.agreement-group { margin: 4px 0 16px; }

.agreement-label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 400;
    line-height: 1.7;
    color: var(--g-ink-2);
    cursor: pointer;
}

.agreement-label input[type="checkbox"] {
    width: 15px;
    height: 15px;
    margin-top: 4px;
    flex-shrink: 0;
    accent-color: var(--g-brand);
    cursor: pointer;
}

.link-text {
    color: var(--g-brand-hov);
    text-decoration: none;
}

.link-text:hover { text-decoration: underline; }

/* ================================================================
   10. 协议弹窗
   ================================================================ */
.modal-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    inset: 0;
    z-index: 1000;
    padding: 24px;
    background: rgba(7, 8, 13, .62);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.modal-box {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 580px;
    max-height: 82vh;
    background: var(--g-surface);
    border-radius: var(--r-lg);
    overflow: hidden;
    box-shadow: var(--shadow-modal);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 24px;
    border-bottom: 1px solid var(--g-line);
    flex-shrink: 0;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 800;
    letter-spacing: -.02em;
    color: var(--g-ink);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--g-ink-2);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    transition: background .15s;
}

.modal-close:hover { background: #F1F3F8; }

.modal-body {
    padding: 20px 24px;
    overflow-y: auto;
    font-size: 13px;
    line-height: 1.85;
    color: #3C4250;
}

.modal-body .modal-updated {
    font-size: 12px;
    color: var(--g-ink-3);
    padding-bottom: 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid #F1F3F8;
}

.modal-body h4 {
    font-size: 13.5px;
    font-weight: 700;
    color: var(--g-ink);
    margin: 18px 0 6px;
}

.modal-body p { margin-bottom: 8px; }

.modal-body ul {
    padding-left: 20px;
    margin-bottom: 8px;
}

.modal-body li { margin-bottom: 4px; }

.modal-footer {
    display: flex;
    justify-content: flex-end;
    padding: 14px 24px;
    border-top: 1px solid var(--g-line);
    background: #F7F8FB;
    flex-shrink: 0;
}

.btn-modal-confirm {
    height: 38px;
    padding: 0 20px;
    border: 0;
    border-radius: var(--r-sm);
    background: var(--g-brand);
    color: #fff;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s;
}

.btn-modal-confirm:hover { background: var(--g-brand-hov); }

/* ================================================================
   11. 小屏适配
   ================================================================ */
@media (max-width: 480px) {
    body { padding: 20px 14px; align-items: flex-start; }

    .auth-container {
        padding: 30px 22px 26px;
        margin-top: 24px;
    }

    .logo h1 { font-size: 20px; }

    .modal-body { padding: 16px 18px; }
    .modal-header { padding: 14px 18px; }
    .modal-footer { padding: 12px 18px; }
}