/* ========== CSS 变量 ========== */
:root {
    --bg: #F9F6F0;
    --bg-card: #FDFCFA;
    --bg-soft: #F3EFE8;
    --bg-hover: #F8F6F0;
    --text: #3D3A35;
    --text-secondary: #5A5550;
    --text-muted: #B8B0A5;
    --text-light: #C5BCB0;
    --text-lighter: #AFA89D;
    --border: #E8E2D8;
    --border-light: #D6CFC4;
    --primary: #D4936B;
    --primary-hover: #C4835B;
    --btn-bg: #4A453F;
    --btn-hover: #3D3A35;
    --radius: 18px;
    --radius-sm: 12px;
    --radius-xs: 10px;
    --radius-full: 30px;
    --shadow: 0 24px 64px rgba(61, 58, 53, 0.1);
    --transition: 0.25s ease;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    --container: 820px;
}

/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    padding: 0 20px;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 20px 0 40px;
}

/* ========== 顶部导航 ========== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0 24px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.3px;
}

.logo span {
    color: var(--primary);
}

.logo a {
    text-decoration: none;
    color: inherit;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 15px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-lighter);
    text-decoration: none;
    transition: color var(--transition);
}

.nav-links a:hover {
    color: var(--text);
}

.nav-links a.active {
    color: var(--text);
    font-weight: 500;
}

.nav-links .btn-login,
.nav-links .btn-logout {
    background: transparent;
    border: 1px solid var(--border-light);
    padding: 6px 20px;
    border-radius: 24px;
    font-size: 14px;
    color: var(--text-lighter);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.nav-links .btn-login:hover,
.nav-links .btn-logout:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #F8F0EA;
}

/* ========== 底部标语 ========== */
.footer-motto {
    text-align: center;
    padding: 40px 0 14px;
    font-size: 13px;
    color: var(--border-light);
    letter-spacing: 0.5px;
}

.footer-motto span {
    color: #E0D9D0;
}

/* ========== 登录弹窗 ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(61, 58, 53, 0.2);
    backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.open {
    display: flex;
}

.modal-box {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 40px 34px 34px;
    max-width: 400px;
    width: 100%;
    box-shadow: var(--shadow);
    position: relative;
    margin: 20px;
}

.modal-box .close-btn {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 22px;
    color: var(--border-light);
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    transition: color var(--transition);
}

.modal-box .close-btn:hover {
    color: var(--text-lighter);
}

.modal-box h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.modal-box .sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.modal-box .form-group {
    margin-bottom: 16px;
}

.modal-box .form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-lighter);
    margin-bottom: 4px;
}

.modal-box .form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: var(--bg-card);
    color: var(--text);
}

.modal-box .form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(212, 147, 107, 0.08);
}

.modal-box .btn-primary {
    width: 100%;
    padding: 13px;
    background: var(--btn-bg);
    color: var(--bg-card);
    border: none;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background var(--transition);
    margin-top: 4px;
}

.modal-box .btn-primary:hover {
    background: var(--btn-hover);
}

.modal-box .switch-link {
    text-align: center;
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-muted);
}

.modal-box .switch-link a {
    color: var(--primary);
    cursor: pointer;
    text-decoration: none;
}

.modal-box .switch-link a:hover {
    text-decoration: underline;
}

.modal-box .guest-hint {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-light);
    border-top: 1px solid var(--border);
    padding-top: 20px;
}

/* ========== 复制按钮固定底部（首页输出卡片） ========== */
.output-card {
    display: flex;
    flex-direction: column;
}

.output-card .card-title {
    flex-shrink: 0;
}

.output-card .card-sub {
    flex-shrink: 0;
}

.output-card .card-body {
    flex: 1;
    min-height: 40px;
}

.output-card .btn-copy {
    flex-shrink: 0;
    margin-top: 14px;
}

/* ========== 复制按钮固定底部（个人中心版本卡片） ========== */
.record-body .version-card {
    display: flex;
    flex-direction: column;
}

.record-body .version-card .v-title {
    flex-shrink: 0;
}

.record-body .version-card .v-sub {
    flex-shrink: 0;
}

.record-body .version-card .v-content {
    flex: 1;
    min-height: 30px;
}

.record-body .version-card .btn-copy {
    flex-shrink: 0;
    margin-top: 12px;
}

/* ========== 响应式 ========== */
@media (max-width: 500px) {
    .navbar {
        padding: 14px 0 18px;
    }
    .nav-links {
        gap: 14px;
        font-size: 14px;
    }
    .modal-box {
        padding: 28px 20px 24px;
    }
}