/* ===== HEADER COMPONENT ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.logo .tagline {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-weight: 400;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.nav-link {
    font-weight: 500;
    color: var(--gray-600);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--gray-50);
}

.nav-icon {
    font-size: 16px;
    line-height: 1;
}

/* ===== MOBILE MENU TOGGLE ===== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    position: relative;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform-origin: center;
}

.mobile-menu-toggle span:nth-child(1) {
    transform-origin: top left;
}

.mobile-menu-toggle span:nth-child(3) {
    transform-origin: bottom left;
}

/* Active state - hamburger to X */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

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

/* ===== MOBILE MENU OVERLAY ===== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    backdrop-filter: blur(10px);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

/* ===== MOBILE NAVIGATION ===== */
.mobile-nav-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-6);
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav-link {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-800);
    text-decoration: none;
    padding: var(--spacing-4) var(--spacing-8);
    border-radius: var(--radius-xl);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    text-align: center;
    min-width: 200px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
}

.mobile-nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.mobile-nav-link:hover::before {
    left: 100%;
}

.mobile-nav-link:hover {
    color: var(--primary-color);
    background-color: var(--white);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.mobile-nav-link:active {
    transform: translateY(-2px);
}

/* ===== MOBILE MENU CLOSE BUTTON ===== */
.mobile-menu-close {
    position: absolute;
    top: var(--spacing-6);
    right: var(--spacing-6);
    width: 48px;
    height: 48px;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 50%;
    font-size: 32px;
    font-weight: 400;
    line-height: 1;
    color: var(--gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 1001;
}

.mobile-menu-close:hover {
    color: var(--gray-800);
    background-color: var(--gray-50);
    transform: rotate(90deg) scale(1.1);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.mobile-menu-close:active {
    transform: rotate(90deg) scale(0.95);
}

/* ===== BODY SCROLL LOCK ===== */
body.mobile-menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

/* ===== HERO COMPONENT ===== */
.hero {
    padding: calc(var(--header-height) + var(--spacing-20)) 0 var(--spacing-20);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-6);
    line-height: 1.1;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.6;
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    height: auto;
}

/* ===== TOOLS SECTION ===== */
.tools-section {
    padding: var(--spacing-20) 0;
    background-color: var(--white);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-12);
}

.tool-card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
    transition: left var(--transition-slow);
}

.tool-card:hover::before {
    left: 100%;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.tool-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-6);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.tool-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
    color: var(--gray-900);
}

.tool-card p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-6);
    line-height: 1.5;
}

.tool-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--primary-color);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.tool-link:hover {
    color: var(--primary-dark);
}

/* ===== BLOG PREVIEW SECTION ===== */
.blog-preview {
    padding: var(--spacing-20) 0;
    background-color: var(--gray-50);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-12);
}

.blog-card {
    background-color: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.blog-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-card-content {
    padding: var(--spacing-6);
}

.blog-card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    color: var(--gray-900);
    line-height: 1.3;
}

.blog-card-excerpt {
    color: var(--gray-600);
    margin-bottom: var(--spacing-4);
    line-height: 1.5;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.blog-cta {
    text-align: center;
}

/* ===== FOOTER COMPONENT ===== */
.footer {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: var(--gray-300);
    padding: var(--spacing-20) 0 var(--spacing-8);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-12);
}

.footer-logo {
    margin-bottom: var(--spacing-4);
}

.footer-logo h3 {
    color: var(--white);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.footer-tagline {
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 500;
    display: block;
    margin-bottom: var(--spacing-4);
}

.footer-section h3,
.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-6);
    font-size: var(--font-size-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.section-icon {
    font-size: 18px;
}

.footer-section p {
    line-height: 1.7;
    margin-bottom: var(--spacing-6);
    color: var(--gray-400);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.footer-section a {
    color: var(--gray-400);
    transition: all var(--transition-fast);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-1) 0;
    border-radius: var(--radius-sm);
}

.footer-section a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.footer-social {
    display: flex;
    gap: var(--spacing-4);
    margin-top: var(--spacing-6);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.social-icon {
    font-size: 20px;
}

.footer-stats {
    display: flex;
    gap: var(--spacing-6);
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--gray-700);
}

.stat-item {
    text-align: center;
    min-width: 60px; /* 防止布局闪动 */
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-1);
    min-height: 1.5em; /* 固定高度防止闪动 */
    line-height: 1.5;
    width: 100%;
    /* 防止数字变化时的布局跳动 */
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    white-space: nowrap; /* 防止文字换行 */
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-8);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.footer-bottom p {
    color: var(--gray-500);
    margin: 0;
}

.footer-badges {
    display: flex;
    gap: var(--spacing-3);
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--gray-300);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ===== CARD COMPONENTS ===== */
.card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--gray-200);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
}

.card-content {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== FORM COMPONENTS ===== */
.form-group {
    margin-bottom: var(--spacing-6);
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-2);
}

.form-input {
    width: 100%;
    padding: var(--spacing-3);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== MODAL COMPONENT ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-6);
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

@media (max-width: 768px) {
    .header {
      display: flex;
      justify-content: center;
    }

    .header-content{
        width: 100%;
        justify-content: space-between;
    }

    .container{
        width: 100%;
    }
}