/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

button {
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 18px;
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0;
    line-height: 1.2;
}

.logo-text p {
    font-size: 11px;
    color: #666;
    margin: 0;
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    gap: 30px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    font-size: 14px;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #1e40af;
}

.header-actions {
    display: flex;
    gap: 15px;
    flex-shrink: 0;
}

.phone-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background-color: #1e40af;
    color: #fff;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.phone-btn:hover {
    background-color: #1e3a8a;
}

.phone-icon {
    font-size: 16px;
}

.phone-number {
    white-space: nowrap;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: #333;
    transition: all 0.3s ease;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    background: linear-gradient(135deg, #f0f4ff 0%, #fff 100%);
    padding: 60px 0;
    text-align: left;
}

.hero-content {
    max-width: 800px;
}

.hero h2 {
    font-size: 48px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero .highlight {
    color: #1e40af;
}

.hero p {
    font-size: 18px;
    color: #555;
    margin-bottom: 30px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: #1e40af;
    color: #fff;
}

.btn-primary:hover {
    background-color: #1e3a8a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: #1e40af;
    border: 2px solid #1e40af;
}

.btn-secondary:hover {
    background-color: #f0f4ff;
}

.btn-kakao {
    background-color: #fae100;
    color: #3c3c3c;
}

.btn-kakao:hover {
    background-color: #f0d800;
}

/* ========================================
   Strengths Section
   ======================================== */
.strengths {
    padding: 80px 0;
    background-color: #fff;
}

.strengths h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 50px;
    text-align: center;
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.strength-card {
    background: linear-gradient(135deg, #f0f4ff 0%, #e8ecff 100%);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #d0deff;
    text-align: center;
    transition: all 0.3s ease;
}

.strength-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(30, 64, 175, 0.15);
}

.strength-icon {
    font-size: 32px;
    color: #1e40af;
    margin-bottom: 15px;
    font-weight: bold;
}

.strength-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.strength-card p {
    font-size: 14px;
    color: #555;
    line-height: 1.6;
}

/* ========================================
   Section Styles
   ======================================== */
.section {
    padding: 80px 0;
}

.section h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 20px;
}

.section-intro {
    font-size: 18px;
    color: #555;
    margin-bottom: 50px;
    max-width: 600px;
    line-height: 1.7;
}

.cooling-section {
    background-color: #f9f9f9;
}

.heating-section {
    background-color: #fff;
}

.event-section {
    background-color: #f9f9f9;
}

/* ========================================
   Products Grid
   ======================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.product-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.product-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.product-card p {
    font-size: 15px;
    color: #555;
    margin-bottom: 20px;
    line-height: 1.7;
}

.product-features {
    list-style: none;
    padding: 0;
}

.product-features li {
    font-size: 14px;
    color: #555;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.product-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #1e40af;
    font-weight: bold;
}

/* ========================================
   Event Grid
   ======================================== */
.event-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.event-card {
    background-color: #fff;
    padding: 25px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.event-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.event-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.event-card p {
    font-size: 14px;
    color: #555;
    line-height: 1.7;
}

/* ========================================
   Special Program Section
   ======================================== */
.special-program {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.special-program h2 {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 15px;
}

.program-subtitle {
    font-size: 18px;
    color: #e0e8ff;
    margin-bottom: 50px;
    line-height: 1.7;
}

.program-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.program-card {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 8px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.program-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #fff;
}

.program-card p {
    font-size: 15px;
    color: #e0e8ff;
    line-height: 1.7;
}

.program-list {
    list-style: none;
    padding: 0;
    text-align: left;
}

.program-list li {
    font-size: 15px;
    color: #e0e8ff;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.program-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #fbbf24;
    font-weight: bold;
}

.support-amount {
    font-size: 36px;
    font-weight: 700;
    color: #fbbf24;
    margin-bottom: 10px;
}

/* ========================================
   Case Studies Section
   ======================================== */
.case-studies {
    padding: 80px 0;
    background-color: #fff;
}

.case-studies h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 50px;
    text-align: center;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.case-item {
    background: linear-gradient(135deg, #f0f4ff 0%, #e8ecff 100%);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #d0deff;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
}

.case-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.15);
}

.case-check {
    font-size: 24px;
    color: #1e40af;
    font-weight: bold;
    flex-shrink: 0;
}

.case-item p {
    font-size: 15px;
    color: #1a1a1a;
    font-weight: 500;
    margin: 0;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.contact-section h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 50px;
    text-align: center;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.contact-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    text-align: center;
    transition: all 0.3s ease;
}

.contact-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.contact-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.contact-card p {
    font-size: 14px;
    color: #555;
    margin-bottom: 15px;
}

.contact-link {
    display: inline-block;
    font-size: 24px;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 8px;
}

.contact-link:hover {
    color: #1e3a8a;
}

.contact-sub {
    font-size: 13px;
    color: #999;
    margin: 0;
}

/* ========================================
   Contact Form
   ======================================== */
.contact-form-wrapper {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.contact-form-wrapper h3 {
    font-size: 24px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 30px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    padding: 12px 15px;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #1e40af;
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

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

.contact-form button {
    margin-top: 10px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: #1a1a1a;
    color: #ccc;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-section p {
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 5px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    font-size: 13px;
    margin-bottom: 8px;
}

.footer-section a {
    color: #ccc;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #1e40af;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
    color: #999;
}

.footer-bottom p {
    margin: 5px 0;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .header-content {
        padding: 10px 0;
    }

    .phone-number {
        display: none;
    }

    .hero h2 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .strengths h2,
    .section h2,
    .contact-section h2,
    .case-studies h2,
    .special-program h2 {
        font-size: 28px;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .event-grid {
        grid-template-columns: 1fr;
    }

    .program-grid {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-form-wrapper {
        padding: 25px;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .section {
        padding: 60px 0;
    }

    .strengths {
        padding: 60px 0;
    }

    .special-program {
        padding: 60px 0;
    }

    .case-studies {
        padding: 60px 0;
    }

    .contact-section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .logo-text h1 {
        font-size: 16px;
    }

    .header-content {
        padding: 8px 0;
    }

    .hero {
        padding: 40px 0;
    }

    .hero h2 {
        font-size: 24px;
    }

    .hero p {
        font-size: 14px;
    }

    .strengths-grid {
        grid-template-columns: 1fr;
    }

    .strength-card {
        padding: 20px;
    }

    .section {
        padding: 40px 0;
    }

    .section h2 {
        font-size: 22px;
    }

    .section-intro {
        font-size: 14px;
    }

    .product-card h3,
    .event-card h3 {
        font-size: 18px;
    }

    .contact-form-wrapper {
        padding: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .special-program h2 {
        font-size: 22px;
    }

    .program-subtitle {
        font-size: 14px;
    }

    .case-studies h2 {
        font-size: 22px;
    }

    .contact-section h2 {
        font-size: 22px;
    }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .header,
    .hero-buttons,
    .contact-methods,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
    }

    a {
        color: #000;
    }
}