/*
  ================================================================================
  Theme: Growth-Focused Partner
  Version: 16.0
  Author: AI Assistant
  Description: A complete, framework-free stylesheet for a modern, growth-focused
               digital marketing agency. Features a dark theme, vibrant green accents,
               structured layouts, and extensive new marketing sections.
  ================================================================================
*/

/* =============================================================================
   1. CSS Variables & Font Imports
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@600;700;800&family=Inter:wght@400;500;600&display=swap');

:root {
    /* Growth-Focused Palette */
    --color-bg-dark: #111111;
    --color-bg-medium: #1A1A1A;
    --color-border: #2B2B2B;
    --color-accent-green: #BEF264;
    /* Lime Green */
    --color-text-headings: #FFFFFF;
    --color-text-body: #A0A0A0;
    --color-text-muted: #6B6B6B;

    /* Typography */
    --font-family-heading: 'Poppins', sans-serif;
    --font-family-body: 'Inter', sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Sizing & Spacing */
    --header-height: 90px;
    --container-width: 1200px;
    --spacing-base: 1rem;
    /* 16px */
    --border-radius-md: 12px;
}

/* =============================================================================
   2. Base & Reset Styles
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family-body);
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--color-text-body);
    background-color: var(--color-bg-dark);
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-family-heading);
    line-height: 1.25;
    color: var(--color-text-headings);
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 4rem;
    letter-spacing: -1.5px;
}

h2 {
    font-size: 3rem;
    letter-spacing: -1px;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1.5rem;
    max-width: 60ch;
}

a {
    color: var(--color-accent-green);
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

/* =============================================================================
   3. Layout & Helpers
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 100px 0;
}

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

.section-title {
    margin-bottom: 4rem;
    text-align: center;
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
}

.section-subtitle {
    display: block;
    font-family: var(--font-family-body);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent-green);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
}

.section-title>p {
    color: var(--color-text-muted);
}

/* Background Grid Pattern */
.bg-grid {
    position: relative;
}

.bg-grid::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: linear-gradient(var(--color-border) 1px, transparent 1px), linear-gradient(to right, var(--color-border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.2;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 100%);
}

/* =============================================================================
   4. Header & Navigation
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(17, 17, 17, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo img {
    height: 80px;
}

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

.main-nav li {
    margin-left: 3rem;
}

.main-nav a {
    color: var(--color-text-body);
    font-weight: var(--font-weight-bold);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-text-headings);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger-icon {
    width: 30px;
    height: 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.hamburger-icon span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--color-text-headings);
    border-radius: 2px;
}

/* =============================================================================
   5. Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 16px 36px;
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    border: 2px solid var(--color-accent-green);
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-accent-green);
    color: var(--color-bg-dark);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-accent-green);
}

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

.btn-secondary:hover {
    background-color: var(--color-bg-medium);
}

/* =============================================================================
   6. Hero Section
   ========================================================================== */
.hero {
    padding: 100px 0;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    margin: 0 auto;
}

.hero-content h1 span {
    color: var(--color-accent-green);
}

.hero-content .subtitle {
    font-size: 1.25rem;
    color: var(--color-text-body);
    margin: 2rem auto;
    max-width: 650px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* =============================================================================
   7. Client Names / "Trusted By" Section
   ========================================================================== */
.client-names {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.client-names-grid {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 4rem;
}

.client-name {
    font-family: var(--font-family-body);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* =============================================================================
   8. Full-Funnel Solutions Section
   ========================================================================== */
.funnel-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.funnel-card {
    background-color: var(--color-bg-medium);
    padding: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
}

.funnel-card h3 {
    font-size: 1.5rem;
}

.funnel-card ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

.funnel-card ul li {
    margin-bottom: 0.5rem;
}

/* =============================================================================
   9. Our Operating System Section
   ========================================================================== */
.os-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.os-card {
    background-color: var(--color-bg-medium);
    padding: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    position: relative;
}

.os-card .step-number {
    font-family: var(--font-family-heading);
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.05);
    position: absolute;
    top: 10px;
    right: 20px;
    z-index: 1;
}

.os-card>* {
    position: relative;
    z-index: 2;
}

.os-card h4 {
    font-family: var(--font-family-body);
    font-weight: bold;
    font-size: 1.2rem;
}

/* =============================================================================
   10. Performance Guarantee Section
   ========================================================================== */
.guarantee-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.guarantee-item {
    display: flex;
    align-items: start;
    gap: 20px;
}

.guarantee-item .icon-wrapper {
    flex-shrink: 0;
    color: var(--color-accent-green);
}

.guarantee-item h4 {
    font-family: var(--font-family-body);
    font-weight: bold;
    font-size: 1.2rem;
}

/* =============================================================================
   11. Case Studies Section
   ========================================================================== */
.case-study-card {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: center;
    padding: 40px 0;
    border-bottom: 1px solid var(--color-border);
}

.case-study-card:first-of-type {
    border-top: 1px solid var(--color-border);
}

.case-study-info .client {
    font-weight: 700;
    color: var(--color-text-headings);
}

.case-study-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.metric-item .value {
    font-family: var(--font-family-heading);
    font-size: 3.5rem;
    color: var(--color-accent-green);
    line-height: 1;
}

.metric-item .label {
    color: var(--color-text-muted);
}

/* =============================================================================
   12. Final CTA & Form Section
   ========================================================================== */
.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-family: var(--font-family-body);
    background-color: var(--color-bg-medium);
    color: var(--color-text-body);
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent-green);
    box-shadow: 0 0 0 3px rgba(190, 242, 100, 0.2);
}

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

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-body);
}

/* =============================================================================
   13. Footer
   ========================================================================== */
.site-footer {
    background-color: var(--color-bg-dark);
    border-top: 1px solid var(--color-border);
    padding-top: 80px;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 50px;
}

.footer-widget h4 {
    font-family: var(--font-family-body);
    font-weight: bold;
    color: var(--color-text-headings);
    font-size: 1.1rem;
}

.footer-widget p,
.footer-widget ul a {
    color: var(--color-text-muted);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 25px 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* =============================================================================
   14. Responsive Design
   ========================================================================== */
@media (max-width: 992px) {
    h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2.5rem;
    }

    .funnel-grid,
    .os-grid,
    .case-study-card {
        grid-template-columns: 1fr;
    }

    .guarantee-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 768px) {
    .section {
        padding: 80px 0;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2.25rem;
    }

    .header-cta {
        display: none;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--color-bg-medium);
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
    }

    .main-nav li {
        margin: 0;
    }

    .main-nav a {
        display: block;
        padding: 1.25rem 1.5rem;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-toggle {
        display: block;
    }

    .case-study-metrics {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}