/* ========================================
   拓冰网站定制 - 全局样式
   数码复古风：深黑 + 银灰 + 浅棕
   ======================================== */

:root {
    --color-deep-black: #0a0a0a;
    --color-dark-gray: #1a1a1a;
    --color-silver: #c0c0c0;
    --color-light-brown: #d4a574;
    --color-brown-accent: #b8956a;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-border: #333333;
    --font-primary: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    --font-mono: 'Courier New', monospace;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-strong: 0 8px 40px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-deep-black);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-smooth);
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-light-brown);
    letter-spacing: 1px;
}

.logo img {
    width: 45px;
    height: 45px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    position: relative;
    font-size: 0.95rem;
    color: var(--color-text-primary);
    padding: 8px 0;
    letter-spacing: 0.5px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-light-brown), var(--color-brown-accent));
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-light-brown);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 28px;
    height: 2px;
    background: var(--color-light-brown);
    transition: var(--transition-smooth);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-dark-gray);
    padding: 60px 0 30px;
    border-top: 2px solid var(--color-light-brown);
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: var(--color-light-brown);
    margin-bottom: 20px;
    font-size: 1.2rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--color-brown-accent);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--color-light-brown);
    padding-left: 8px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--color-text-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   通用动画
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-dark-gray);
        flex-direction: column;
        padding: 80px 30px;
        gap: 25px;
        transition: var(--transition-smooth);
        box-shadow: var(--shadow-strong);
    }

    .nav-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 15px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}