/* 
 * 淘南京 - 通用基础样式
 * 包含变量、重置、布局组件、页眉页脚等
 */

:root {
    --primary-color: #dc2626; /* red-600 */
    --primary-hover: #b91c1c; /* red-700 */
    --text-main: #111827; /* gray-900 */
    --text-muted: #4b5563; /* gray-600 */
    --text-light: #9ca3af; /* gray-400 */
    --bg-light: #f9fafb; /* gray-50 */
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --container-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.5;
    background-color: var(--white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 1.5rem 0;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 0;
}

.recommend-box {
    background: linear-gradient(135deg, #fef2f2 0%, #fff 100%);
    padding: 0.75rem 1.25rem;
    border-radius: 1.25rem;
    border: 1px solid #fee2e2;
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    box-shadow: 0 4px 6px -1px rgba(220, 38, 38, 0.03);
}

.recommend-label {
    font-size: 0.625rem;
    color: #f87171;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.recommend-dish {
    color: #b91c1c;
    font-weight: 800;
    font-size: 1.125rem;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.logo-box {
    width: 2.25rem;
    height: 2.25rem;
    background-color: var(--primary-color);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 900;
    font-size: 1.125rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--white);
    transition: color 0.3s;
}

.navbar.scrolled .logo-text {
    color: var(--text-main);
}

.nav-links {
    display: none;
    align-items: center;
    gap: 2rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

.navbar.scrolled .nav-links {
    color: var(--text-muted);
}

.nav-links a {
    transition: color 0.3s;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--white);
    transition: color 0.3s;
}

.navbar.scrolled .nav-icon {
    color: var(--text-muted);
}

.nav-icon-btn {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
    outline: none;
}

.nav-icon-btn:hover {
    transform: scale(1.1);
}

.login-btn {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--white);
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.3s;
}

.navbar.scrolled .login-btn {
    color: var(--text-main);
}

.join-btn {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.join-btn:hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

/* Sections Common */
.section {
    padding: 8rem 0;
}

.section-header {
    display: flex;
    flex-direction: column;
    margin-bottom: 4rem;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .section-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-end;
    }
}

.section-tag {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    font-weight: 800;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

.tag-line {
    width: 2rem;
    height: 2px;
    background-color: var(--primary-color);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.btn-outline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: 1.5px solid #e5e7eb;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    background: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-outline:hover {
    border-color: var(--text-main);
    background-color: var(--bg-light);
}

.btn-dark {
    background-color: var(--text-main);
    color: var(--white);
    padding: 0.625rem 1.5rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-dark:hover {
    background-color: #000;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Coming Soon Section */
.coming-soon {
    padding: 6rem 0;
    text-align: center;
    background-color: var(--white);
}

.coming-soon-title {
    color: #e5e7eb;
    font-weight: 800;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    font-size: 0.75rem;
    margin-bottom: 4rem;
}

.features-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4rem;
    opacity: 0.25;
    filter: grayscale(1);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.features-list:hover {
    opacity: 1;
    filter: grayscale(0);
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    cursor: default;
}

.feature-item i {
    width: 2.5rem;
    height: 2.5rem;
    color: #6b7280;
    transition: all 0.3s;
}

.feature-item:hover i {
    color: var(--primary-color);
    transform: translateY(-5px);
}

.feature-item span {
    font-size: 0.875rem;
    font-weight: 800;
    color: #6b7280;
}

/* Footer */
.footer {
    background-color: var(--white);
    padding: 4rem 0;
    border-top: 1px solid #f3f4f6;
}

.footer-container {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 768px) {
    .footer-container {
        flex-direction: row;
    }
}

.copyright {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: 500;
}

.footer-links {
    display: flex;
    gap: 2.5rem;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-muted);
}

.footer-links a {
    transition: color 0.3s;
}

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

/* Shared Utilities */
.tag-item {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.35rem 0.85rem;
    background-color: #f3f4f6;
    color: #4b5563;
    border-radius: 9999px;
}

.rating {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    color: #eab308;
    font-weight: 800;
}

.separator {
    color: #e5e7eb;
    font-weight: 300;
}

/* Animations */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fade-in-up 0.8s cubic-bezier(0.2, 1, 0.3, 1) forwards;
}

@media (max-width: 640px) {
    .section {
        padding: 5rem 0;
    }
}