:root {
    --bg-color: #0d1117;
    --card-bg-color: #161b22;
    --border-color: #30363d;
    --text-color: #c9d1d9;
    --text-muted-color: #8b949e;
    --gradient-start: #58a6ff;
    --gradient-end: #a371f7;
    --primary-gradient: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    --font-family: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 80px 0;
}

h1, h2, h3 {
    line-height: 1.3;
    font-weight: 700;
}

h1 {
    font-size: 3.2rem;
    margin-bottom: 20px;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #f0f6fc;
}

p {
    font-size: 1.1rem;
    color: var(--text-muted-color);
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.25);
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Header */
.main-header {
    padding: 20px 0;
    position: sticky;
    top: 0;
    background-color: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: inline-block;
    height: 45px;
    text-decoration: none;
}

.logo-image {
    height: 100%;
    width: auto;
    max-width: 220px;
    object-fit: contain;
}

.main-header nav a {
    color: var(--text-muted-color);
    text-decoration: none;
    margin-left: 25px;
    transition: color 0.2s ease;
}

.main-header nav a:hover {
    color: var(--gradient-start);
}

/* Hero Section */
.hero-image {
    width: 100%;
    height: auto;
    border-radius: 12px;
}
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 500px;
}

.cta-buttons a {
    margin-right: 15px;
}

.placeholder-image {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 350px;
    background-color: var(--card-bg-color);
    border: 1px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-muted-color);
    font-size: 1.2rem;
}

/* Problem Section */
.problem-grid, .benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.card {
    background-color: var(--card-bg-color);
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--gradient-start);
}

/* Solution Section */
.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
}
.solution-text p {
    margin-bottom: 15px;
}

/* How It Works Section */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}
.step-card {
    position: relative;
    padding: 30px 20px;
}
.step-number {
    position: absolute;
    top: 0;
    left: 20px;
    font-size: 3rem;
    font-weight: 800;
    color: rgba(139, 148, 158, 0.1);
    z-index: -1;
}
.step-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    margin: 0 auto 20px;
}
.step-icon i {
    width: 32px;
    height: 32px;
}
.step-card h3 {
    text-align: center;
}
.step-card p {
    font-size: 1rem;
}

/* ROI Calculator Section */
.roi-calculator-section {
    background-color: var(--card-bg-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}
.roi-calculator-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
    background-color: var(--bg-color);
    padding: 60px;
    border-radius: 16px;
}
.calculator-text h2 {
    text-align: left;
    margin-bottom: 20px;
}
.calculator-form {
    margin-top: 30px;
}
.input-group {
    margin-bottom: 20px;
}
.input-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted-color);
}
.input-group input {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.input-group input:hover:not(:focus) {
    border-color: var(--text-muted-color);
}
.input-group input:focus {
    outline: none;
    border-color: var(--gradient-start);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}
.calculator-form .btn {
    width: 100%;
    text-align: center;
}
.roi-result {
    background: var(--primary-gradient);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    color: white;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.roi-result.visible {
    opacity: 1;
    transform: scale(1);
}
.roi-result p {
    color: rgba(255,255,255,0.8);
    font-size: 1.1rem;
}
.roi-result h2 {
    font-size: 4rem;
    color: white;
    margin: 10px 0;
}
.savings-description {
    font-size: 1.2rem !important;
    font-weight: 600;
    margin-bottom: 20px;
}

/* Final CTA Section */
.final-cta-section {
    text-align: center;
}
.final-cta-section h2 {
    margin-bottom: 20px;
}
.final-cta-section > .container > p {
    max-width: 600px;
    margin: 0 auto 40px;
}
.social-proof {
    margin-top: 40px;
    color: var(--text-muted-color);
}
.social-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
    align-items: center;
}
.placeholder-icon {
    padding: 8px 16px;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-weight: 500;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 200;
}
.modal.show {
    visibility: visible;
    opacity: 1;
}
.modal-content {
    position: relative;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px 30px;
    width: 90%;
    max-width: 420px;
    text-align: center;
}
.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-muted-color);
    font-size: 1.5rem;
    cursor: pointer;
}
#signup-form input {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    margin-bottom: 20px;
}
#signup-form input:focus {
    outline: none;
    border-color: var(--gradient-start);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}
.modal-success {
    color: var(--gradient-start);
    font-weight: 600;
    margin-top: 20px;
}

/* Footer */
.main-footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted-color);
    border-top: 1px solid var(--border-color);
}

/* Scroll Animation */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 900px) {
    .hero-content, .solution-content, .roi-calculator-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-text, .solution-text {
        order: 2;
    }
    .hero-visual, .solution-visual {
        order: 1;
        margin-bottom: 40px;
    }
     .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }
    h1, h2 {
        font-size: 2.5rem;
    }
    .problem-grid, .benefits-grid, .steps-grid {
        grid-template-columns: 1fr;
    }
    .main-header nav {
        display: none; /* Simple responsive solution */
    }
}