/* ===== CSS Variables ===== */
:root {
    --primary-color: #126f77;
    --primary-hover: #0f5a60;
    --primary-light: #e8f4f5;
    --secondary-color: #2c3e50;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --background: #ffffff;
    --background-alt: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --border-radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background-color: var(--background-alt);
    border-color: var(--text-secondary);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.625rem 1.5rem;
}

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

.btn-lg {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-img {
    height: 50px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(18, 111, 119, 0.02) 0%, transparent 50%);
}

.hero-main-title {
    text-align: center;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 3rem;
    color: var(--text-primary);
    animation: fadeInUp 0.8s ease;
    letter-spacing: -0.02em;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 5rem;
    align-items: center;
    padding-bottom: 4rem;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.highlight {
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    animation: fadeInUp 0.8s ease 0.2s both;
    font-weight: 400;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
}

.hero-feature-item svg {
    flex-shrink: 0;
    color: var(--primary-color);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
    margin-top: 0.5rem;
}

/* Hero Image */
.hero-image {
    position: relative;
    animation: fadeInRight 0.8s ease 0.3s both;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(18, 111, 119, 0.15);
    transition: var(--transition);
}

.hero-image-wrapper:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 70px rgba(18, 111, 119, 0.2);
}

.hero-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-lg);
}

.hero-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.3) 0%,
        transparent 40%,
        rgba(18, 111, 119, 0.05) 100%
    );
    pointer-events: none;
    border-radius: var(--border-radius-lg);
}

/* Fade in from right animation */
@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Hero Background Decoration */
.hero-bg-decoration {
    position: absolute;
    top: 0;
    right: 0;
    width: 45%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(18, 111, 119, 0.05) 50%, transparent 100%);
    border-radius: 0 0 0 50%;
    z-index: -1;
    opacity: 0.8;
}

.hero-bg-decoration::before {
    content: '';
    position: absolute;
    top: 20%;
    right: 10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(18, 111, 119, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.hero-bg-decoration::after {
    content: '';
    position: absolute;
    bottom: 15%;
    right: 25%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(18, 111, 119, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ===== Section Styles ===== */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-title {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Concept Section ===== */
.concept {
    background-color: var(--background);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background-color: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background-color: var(--primary-light);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

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

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== How It Works Section ===== */
.how-it-works {
    background-color: var(--background-alt);
}

.info-blocks {
    display: grid;
    gap: 2rem;
}

.info-block {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background-color: var(--background);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.info-block:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.info-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-light);
    line-height: 1;
    flex-shrink: 0;
}

.info-block h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.info-block p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Benefits Section ===== */
.benefits {
    background-color: var(--background);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.benefits-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.benefits-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.benefits-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.benefits-list svg {
    flex-shrink: 0;
    color: var(--primary-color);
    margin-top: 2px;
}

.benefits-list span {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.benefits-visual {
    display: flex;
    justify-content: center;
}

.stats-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    padding: 3rem 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    max-width: 400px;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

/* ===== Join Section ===== */
.join-section {
    background: linear-gradient(135deg, var(--background-alt) 0%, var(--background) 100%);
}

.join-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.join-info {
    padding-top: 2rem;
}

.join-info p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.join-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.join-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.join-feature svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.join-form-wrapper {
    background-color: var(--background);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.join-form h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--background);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(18, 111, 119, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-note {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 1rem;
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 1rem;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
    font-size: 0.875rem;
}

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

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .hero-main-title {
        font-size: clamp(2rem, 5vw, 3rem);
        margin-bottom: 2rem;
    }

    .hero-grid,
    .benefits-content,
    .join-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero-grid {
        gap: 2.5rem;
    }

    .hero-bg-decoration {
        width: 60%;
        opacity: 0.6;
    }

    .hero-bg-decoration::before,
    .hero-bg-decoration::after {
        display: none;
    }

    .stats-card {
        max-width: 100%;
    }

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

    .info-block {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem 1.5rem;
        gap: 1.5rem;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        left: 0;
    }

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

    .hero {
        min-height: auto;
        padding-top: 100px;
    }

    .hero-main-title {
        font-size: clamp(1.75rem, 4vw, 2.5rem);
        text-align: left;
        margin-bottom: 1.5rem;
    }

    .hero-grid {
        gap: 2rem;
    }

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

    .hero-bg-decoration {
        width: 80%;
        opacity: 0.4;
        border-radius: 0 0 0 30%;
    }

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

    .hero-cta .btn {
        width: 100%;
    }

    .section {
        padding: 3rem 0;
    }

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

    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .section-title {
        font-size: 1.75rem;
    }

    .join-form-wrapper {
        padding: 1.5rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
    }

    .btn-lg {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

/* ===== Success Message ===== */
.success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border: 1px solid #c3e6cb;
    display: none;
}

.success-message.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

/* ===== Smooth Scrolling Indicator ===== */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-10px) translateX(-50%);
    }
    60% {
        transform: translateY(-5px) translateX(-50%);
    }
}