/* ============================================================
   shared.css — 美刻纸间 全局样式
   所有颜色集中在 :root 中，三个页面共用
   ============================================================ */

:root {
    /* 主色 */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-light: #DBEAFE;
    --color-primary-bg: #EFF6FF;

    /* 中性色 */
    --color-bg: #EFF3F7;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F8FAFC;
    --color-border: #DCE3EC;
    --color-border-hover: #93C5FD;

    /* 文字 */
    --color-text: #1E293B;
    --color-text-secondary: #475569;
    --color-text-muted: #64748B;
    --color-text-light: #94A3B8;

    /* 卡片 */
    --card-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    --card-shadow-hover: 0 12px 28px -8px rgba(37, 99, 235, 0.15);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 40px;

    /* 过渡 */
    --transition: 0.2s ease;

    /* 字体 */
    --font-family: 'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;

    /* 弹窗遮罩 */
    --modal-overlay: rgba(15, 23, 42, 0.5);
}

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

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== 顶部导航（三个页面共用） ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-icon {
    background: var(--color-primary);
    color: var(--color-surface);
    width: 34px;
    height: 34px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-text {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--color-text);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

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

.btn-outline-nav {
    border: 1px solid var(--color-border);
    padding: 0.3rem 1rem;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition);
}

.btn-outline-nav:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}

.btn-primary-nav {
    background: var(--color-primary);
    color: var(--color-surface) !important;
    padding: 0.3rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: background var(--transition);
}

.btn-primary-nav:hover {
    background: var(--color-primary-hover) !important;
}

/* ===== 底部（三个页面共用） ===== */
footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem 0 3rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

footer a {
    color: var(--color-text-muted);
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--color-primary);
}

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

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

.modal-box {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 2rem 2.2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 30px 60px -16px rgba(0, 0, 0, 0.3);
    animation: modalFadeIn 0.25s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-box .modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
    color: var(--color-text);
}

.modal-box .modal-sub {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.modal-box .form-group {
    margin-bottom: 1rem;
}

.modal-box .form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 0.2rem;
}

.modal-box .form-group input {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border var(--transition);
    background: var(--color-surface);
    color: var(--color-text);
}

.modal-box .form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.modal-box .btn-login {
    width: 100%;
    padding: 0.6rem;
    background: var(--color-primary);
    color: var(--color-surface);
    border: none;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition);
    font-family: inherit;
}

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

.modal-box .modal-footer-text {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 1rem;
}

.modal-box .modal-footer-text a {
    color: var(--color-primary);
    text-decoration: none;
}

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

.modal-box .modal-close {
    float: right;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-light);
    cursor: pointer;
    transition: color var(--transition);
    line-height: 1;
}

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

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: stretch;
        padding: 0.6rem 1rem;
    }

    .nav-links {
        justify-content: center;
        gap: 0.6rem;
    }

    .modal-box {
        margin: 1rem;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .modal-box {
        padding: 1.2rem;
    }
}