/* ===========================
   BLUETERRA - Global Styles
   =========================== */

:root {
    /* Brand Colors */
    --primary-navy: #004A8F;
    --primary-orange: #FF6B35;
    --primary-green: #2D5F3F;
    --primary-white: #FFFFFF;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-navy), #0066CC);
    --gradient-orange: linear-gradient(135deg, var(--primary-orange), #FF8C5A);
    --gradient-green: linear-gradient(135deg, var(--primary-green), #3D7F5F);
    
    /* Typography */
    --font-main: 'Noto Sans KR', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
}

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

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

body {
    font-family: var(--font-main);
    color: #333;
    line-height: 1.7;
    overflow-x: hidden;
}

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

/* ===========================
   NAVIGATION
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-logo img {
    height: 50px;
    transition: var(--transition-fast);
}

.nav-logo img:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--primary-navy);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-orange);
    transition: var(--transition-fast);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-navy);
    transition: var(--transition-fast);
}

/* ===========================
   HERO SECTION
   =========================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 107, 53, 0.1), transparent),
        radial-gradient(circle at 80% 30%, rgba(45, 95, 63, 0.1), transparent);
    animation: backgroundMove 20s ease-in-out infinite;
}

@keyframes backgroundMove {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, 20px); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 74, 143, 0.7);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--primary-white);
    padding: var(--spacing-lg) var(--spacing-md);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-title .highlight {
    color: var(--primary-orange);
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    color: var(--primary-white);
    text-align: center;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 2px;
    height: 30px;
    background: var(--primary-white);
    margin: var(--spacing-xs) auto 0;
}

@keyframes bounce {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, 10px); }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 1s ease-out;
}

.fade-in-delay {
    animation: fadeIn 1s ease-out 0.3s both;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.6s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   BUTTONS
   =========================== */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-orange);
    color: var(--primary-white);
}

.btn-primary:hover {
    background: #FF8C5A;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-white);
    border-color: var(--primary-white);
}

.btn-secondary:hover {
    background: var(--primary-white);
    color: var(--primary-navy);
}

.btn-block {
    display: block;
    width: 100%;
}

/* ===========================
   SECTIONS
   =========================== */

section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.text-white {
    color: var(--primary-white) !important;
}

/* ===========================
   SOLUTIONS PREVIEW
   =========================== */

.solutions-preview {
    background: #f8f9fa;
}

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

.solution-card {
    background: var(--primary-white);
    padding: var(--spacing-md);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    text-align: center;
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.solution-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
}

.solution-icon svg {
    width: 100%;
    height: 100%;
}

.solution-card h3 {
    font-size: 1.5rem;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-sm);
}

.solution-card p {
    color: #666;
    margin-bottom: var(--spacing-sm);
}

.solution-link {
    color: var(--primary-orange);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.solution-link:hover {
    color: var(--primary-navy);
}

/* ===========================
   IMPACT SECTION
   =========================== */

.impact {
    background: var(--gradient-primary);
    color: var(--primary-white);
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

.impact-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--primary-orange);
    line-height: 1;
}

.impact-unit {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: -10px;
    margin-bottom: var(--spacing-xs);
}

.impact-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ===========================
   ABOUT SECTION
   =========================== */

.about {
    background: var(--primary-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-text h2 {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.about-text h3 {
    color: var(--primary-navy);
    font-size: 1.5rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.about-text .lead {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: var(--spacing-md);
}

.brand-story {
    display: flex;
    gap: var(--spacing-sm);
    align-items: start;
    background: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: 12px;
    margin: var(--spacing-md) 0;
}

.brand-icon {
    font-size: 2rem;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--spacing-xs) 0 var(--spacing-xs) var(--spacing-md);
    position: relative;
    color: #555;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 700;
}

.about-features h3 {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.feature-card {
    display: flex;
    gap: var(--spacing-sm);
    align-items: start;
    padding: var(--spacing-md);
    background: #f8f9fa;
    border-radius: 12px;
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-normal);
}

.feature-card:hover {
    background: #e9ecef;
    transform: translateX(10px);
}

.feature-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--gradient-orange);
    color: var(--primary-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.feature-content h4 {
    color: var(--primary-navy);
    margin-bottom: var(--spacing-xs);
}

.feature-content p {
    color: #666;
    font-size: 0.95rem;
}

/* ===========================
   SOLUTIONS DETAIL
   =========================== */

.solutions {
    background: #f8f9fa;
}

.solution-detail {
    margin-bottom: var(--spacing-xl);
}

.solution-detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--primary-white);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.solution-detail.reverse .solution-detail-content {
    direction: rtl;
}

.solution-detail.reverse .solution-detail-text {
    direction: ltr;
}

.solution-detail.reverse .solution-detail-image {
    direction: ltr;
}

.solution-tag {
    display: inline-block;
    background: var(--primary-orange);
    color: var(--primary-white);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.solution-detail-text h3 {
    font-size: 2rem;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-sm);
}

.solution-detail-text h4 {
    color: var(--primary-navy);
    font-size: 1.3rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.solution-detail-text ul {
    list-style: none;
    padding: 0;
}

.solution-detail-text li {
    padding: var(--spacing-xs) 0 var(--spacing-xs) var(--spacing-md);
    position: relative;
    color: #555;
}

.solution-detail-text li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-orange);
    font-weight: 700;
    font-size: 1.5rem;
}

.solution-lead {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: var(--spacing-md);
}

.feature-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.badge {
    display: inline-block;
    background: #e9ecef;
    color: var(--primary-navy);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

.effects {
    margin-top: var(--spacing-sm);
}

.effect-item {
    padding: var(--spacing-xs) 0;
    color: var(--primary-green);
    font-weight: 600;
}

.solution-detail-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.solar-gradient {
    background: linear-gradient(135deg, #FFE5D9, #FFF8F5);
}

.community-gradient {
    background: linear-gradient(135deg, #E8F5E9, #F1F8E9);
}

.bike-gradient {
    background: linear-gradient(135deg, #E3F2FD, #F5F5F5);
}

/* ===========================
   CTA SECTION
   =========================== */

.cta {
    background: var(--gradient-green);
    color: var(--primary-white);
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

/* ===========================
   CONTACT SECTION
   =========================== */

.contact {
    background: var(--primary-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.contact-info h3 {
    color: var(--primary-navy);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #e9ecef;
}

.info-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.info-item strong {
    display: block;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-xs);
}

.info-item p {
    color: #666;
    line-height: 1.6;
}

.business-hours {
    background: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: 12px;
    margin-top: var(--spacing-md);
}

.business-hours strong {
    display: block;
    color: var(--primary-navy);
    margin-bottom: var(--spacing-xs);
}

.business-hours p {
    color: #666;
}

/* Contact Form */
.contact-form {
    background: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: 16px;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    color: var(--primary-navy);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-family: var(--font-main);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-orange);
}

.form-group textarea {
    resize: vertical;
}

/* ===========================
   FOOTER
   =========================== */

.footer {
    background: var(--primary-navy);
    color: var(--primary-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-logo img {
    height: 60px;
    margin-bottom: var(--spacing-sm);
    filter: brightness(0) invert(1);
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links h4,
.footer-contact h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-orange);
}

.footer-links a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: var(--spacing-xs) 0;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-white);
    padding-left: var(--spacing-xs);
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.8);
    padding: 0.2rem 0;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ===========================
   SCROLL TO TOP BUTTON
   =========================== */

.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-orange);
    color: var(--primary-white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--primary-navy);
    transform: translateY(-5px);
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */

@media (max-width: 968px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .solution-detail-content {
        grid-template-columns: 1fr;
    }
    
    .solution-detail.reverse .solution-detail-content {
        direction: ltr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--primary-white);
        width: 100%;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .impact-number {
        font-size: 3rem;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* ===========================
   UTILITY CLASSES
   =========================== */

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

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}