:root {
    --primary-color: #1e40af;
    --secondary-color: #3b82f6;
    --accent-color: #60a5fa;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --background: #ffffff;
    --section-bg: #f8fafc;
    --spacing: 2rem;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

/* Header & Navigation */
header {
    background-color: var(--background);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

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

nav h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.5px;
    text-decoration: none;
    transition: color 0.3s ease;
}

nav h1:hover {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 2rem;
    transition: color 0.3s ease;
    white-space: nowrap;
}

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

.blog-link {
    position: relative;
    padding-right: 1.2rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.blog-link::after {
    content: '↗';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9em;
    transition: transform 0.3s ease;
}

.blog-link:hover::after {
    transform: translate(2px, -50%);
}

.heart-icon {
    color: #e11d48;
    font-size: 1.1em;
    animation: heartBeat 1.2s ease-in-out infinite;
}

@keyframes heartBeat {
    0% {
        transform: scale(1);
    }
    14% {
        transform: scale(1.3);
    }
    28% {
        transform: scale(1);
    }
    42% {
        transform: scale(1.3);
    }
    70% {
        transform: scale(1);
    }
}

.blog-link:hover .heart-icon {
    animation-play-state: paused;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e40af, #3b82f6);
    color: white;
    padding: calc(2 * var(--spacing)) var(--spacing);
    margin-top: 60px;
    text-align: center;
    overflow: hidden;
    min-height: 400px;
    display: flex;
    align-items: center;
}

.hero h2 {
    font-size: 2.2rem;
    margin-bottom: 0.75rem;
}

.hero .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* Carousel */
.carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.carousel-inner {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.carousel-slide {
    flex: 0 0 100%;
    width: 100%;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.3);
    border: none;
    color: white;
    padding: 1rem;
    cursor: pointer;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: background 0.3s ease;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

.carousel-btn.prev {
    left: 20px;
}

.carousel-btn.next {
    right: 20px;
}

.carousel-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background 0.3s ease;
}

.dot.active {
    background: white;
}

.tool-recommendation {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(5px);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.tool-name {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: white;
}

.tool-link {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: white;
    color: #1e40af;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tool-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.15);
}

/* Sections */
.section {
    padding: calc(2 * var(--spacing)) 0;
}

.section h2 {
    text-align: center;
    margin-bottom: calc(2 * var(--spacing));
    font-size: 2rem;
}

.alternate {
    background-color: var(--section-bg);
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing);
}

.card {
    background: var(--background);
    padding: var(--spacing);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.1);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Benefits */
.benefit-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing);
}

.benefit-item {
    text-align: center;
    padding: var(--spacing);
}

.benefit-item h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Steps */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing);
}

.step {
    text-align: center;
    padding: var(--spacing);
}

.step-number {
    width: 40px;
    height: 40px;
    background-color: #1e40af;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: bold;
}

/* Footer */
footer {
    background-color: var(--section-bg);
    padding: var(--spacing);
    text-align: center;
    color: var(--light-text);
}

/* Language Switch */
.language-switch {
    position: relative;
    margin-left: 1rem;
}

.lang-select-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.lang-select-btn:hover {
    background: var(--accent-color);
}

.lang-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #eee;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    z-index: 1000;
    min-width: 150px;
    margin-top: 0.5rem;
}

.language-switch.active .lang-dropdown {
    display: block;
}

.lang-option {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.lang-option:hover {
    background: var(--section-bg);
    color: var(--primary-color);
}

.lang-option.active {
    background: var(--primary-color);
    color: white;
}

/* Menu Toggle Button */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    position: relative;
    transition: background-color 0.3s;
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: transform 0.3s;
}

.menu-icon::before {
    top: -6px;
}

.menu-icon::after {
    bottom: -6px;
}

.menu-toggle.active .menu-icon {
    background-color: transparent;
}

.menu-toggle.active .menu-icon::before {
    transform: rotate(45deg) translate(4px, 4px);
}

.menu-toggle.active .menu-icon::after {
    transform: rotate(-45deg) translate(4px, -4px);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing: 1rem;
    }

    .nav-links {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        position: fixed;
        top: 60px;
        right: -100%;
        background: var(--background);
        width: 100%;
        padding: 1rem;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        height: calc(100vh - 60px);
        overflow-y: auto;
    }

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

    .nav-links a {
        margin: 0.5rem 0;
        width: 100%;
    }

    .language-switch {
        margin: 1rem 0;
        width: 100%;
    }

    .lang-select-btn {
        width: 100%;
        justify-content: space-between;
    }

    .hero {
        padding: calc(1.5 * var(--spacing)) var(--spacing);
        min-height: 350px;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .hero .subtitle {
        font-size: 1rem;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .card-grid,
    .benefit-list,
    .steps {
        grid-template-columns: 1fr;
    }

    .menu-toggle {
        display: block;
    }

    .tool-name {
        font-size: 1.6rem;
    }

    .tool-recommendation {
        padding: 1.25rem;
        margin-top: 1.25rem;
    }

    .blog-link {
        width: 100%;
        justify-content: flex-start;
        padding-right: 0;
    }
    
    .blog-link::after {
        right: 1rem;
    }

    .lang-dropdown {
        position: static;
        width: 100%;
        margin-top: 0.5rem;
        border: none;
        box-shadow: none;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.benefit-item,
.step {
    animation: fadeIn 0.5s ease-out forwards;
}