/* ===================================
   Daniel Richartz - Speaker Website
   CSS Stylesheet
   =================================== */

/* Variables */
:root {
    --color-primary: #0071e3;
    --color-primary-dark: #0058b0;
    --color-secondary: #1d1d1f;
    --color-text: #1d1d1f;
    --color-text-light: #86868b;
    --color-background: #ffffff;
    --color-background-alt: #f5f5f7;
    --color-accent: #40a9ff;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-error: #dc2626;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;

    --border-radius: 12px;
    --border-radius-lg: 20px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12);

    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-secondary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; margin-bottom: var(--spacing-md); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); letter-spacing: -0.01em; }
h4 { font-size: 1.125rem; }

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

.lead {
    font-size: 1.25rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

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

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: rgba(0, 0, 0, 0.2);
}

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

.btn-full {
    width: 100%;
}

.btn-nav {
    padding: 10px 20px;
    background: var(--color-primary);
    color: white !important;
    border-radius: 50px;
    font-weight: 600;
}

.btn-nav:hover {
    background: var(--color-primary-dark);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
}

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

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

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

/* Hero Section */
.hero {
    padding: calc(70px + var(--spacing-xl)) 0 var(--spacing-xl);
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-tagline {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.hero h1 {
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Social Proof */
.social-proof {
    padding: var(--spacing-lg) 0;
    background: var(--color-background-alt);
}

.social-proof .container {
    text-align: center;
}

.social-proof p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.social-proof .logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.social-proof .logos img {
    height: 40px;
    opacity: 0.6;
    filter: grayscale(100%);
    transition: var(--transition);
}

.social-proof .logos img:hover {
    opacity: 1;
    filter: grayscale(0%);
}

/* Problem Section */
.problem-section {
    padding: var(--spacing-xxl) 0;
}

.problem-section h2 {
    text-align: center;
}

.problem-section .lead {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.problem-card {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: var(--transition);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.problem-card h3 {
    margin-bottom: var(--spacing-xs);
}

.problem-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Expertise Section */
.expertise-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-background-alt);
}

.expertise-section h2 {
    text-align: center;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.expertise-card {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.expertise-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.expertise-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.expertise-card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.expertise-card ul {
    list-style: none;
}

.expertise-card li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
}

.expertise-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* Method Section (4E) */
.method-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
}

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

.method-section h2 {
    color: white;
}

.method-section .lead {
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.method-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.method-item {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
}

.method-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: white;
    color: var(--color-primary);
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50%;
    margin-bottom: var(--spacing-sm);
}

.method-item h4 {
    color: white;
    margin-bottom: var(--spacing-xs);
}

.method-item p {
    font-size: 0.9rem;
    opacity: 0.9;
}

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

.method-section .btn-primary:hover {
    background: var(--color-background-alt);
    transform: translateY(-2px);
}

/* Services Section */
.services-section {
    padding: var(--spacing-xxl) 0;
}

.services-section h2 {
    text-align: center;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.service-card {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition);
    position: relative;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.service-card.featured {
    border: 2px solid var(--color-primary);
}

.service-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 16px;
    border-radius: 50px;
}

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

.service-card h3 {
    margin-bottom: var(--spacing-sm);
}

.service-card > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.service-card ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.service-card li {
    padding: 6px 0;
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* About Section */
.about-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-background-alt);
}

.about-section .container {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-content .lead {
    margin-bottom: var(--spacing-md);
}

.about-content p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.about-facts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.fact {
    display: flex;
    flex-direction: column;
}

.fact strong {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.fact span {
    font-size: 0.9rem;
    color: var(--color-text);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--color-background);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.social-link:hover {
    background: var(--color-primary);
    color: white;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* Download Section */
.download-section {
    padding: var(--spacing-xxl) 0;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.download-preview {
    position: relative;
}

.download-preview img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.download-form h2 {
    margin-bottom: var(--spacing-sm);
}

.download-form > p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.download-benefits {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.download-benefits li {
    padding: 8px 0;
    font-size: 1rem;
}

.optin-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.optin-form input {
    padding: 14px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.optin-form input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.form-hint {
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-align: center;
}

.form-hint a {
    color: var(--color-text-light);
    text-decoration: underline;
}

/* Testimonials Section */
.testimonials-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-background-alt);
}

.testimonials-section h2 {
    text-align: center;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.testimonial-card {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.testimonial-text {
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-author strong {
    display: block;
    font-size: 0.95rem;
}

.testimonial-author span {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

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

.client-logos h3 {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.client-logos .logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.client-logos .logos img {
    height: 50px;
    opacity: 0.5;
    filter: grayscale(100%);
}

/* Contact Section */
.contact-section {
    padding: var(--spacing-xxl) 0;
}

.contact-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.contact-content h2 {
    margin-bottom: var(--spacing-sm);
}

.contact-content .lead {
    margin-bottom: var(--spacing-lg);
}

.contact-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-option h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.contact-option p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

.contact-link {
    font-weight: 600;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    padding: 14px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--color-background);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.contact-form textarea {
    resize: vertical;
}

/* Footer */
.footer {
    background: var(--color-secondary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-brand h3 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-company {
    margin-top: var(--spacing-sm);
    font-weight: 600;
}

.footer h4 {
    color: white;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.footer ul {
    list-style: none;
}

.footer li {
    margin-bottom: 8px;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer a:hover {
    color: white;
}

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

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        order: 2;
    }

    .hero-image {
        order: 1;
        max-width: 400px;
        margin: 0 auto;
    }

    .hero-description {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .problem-grid,
    .expertise-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

    .method-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-section .container {
        grid-template-columns: 1fr;
    }

    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }

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

    .download-preview {
        max-width: 300px;
        margin: 0 auto;
    }

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

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

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

@media (max-width: 768px) {
    :root {
        --spacing-xl: 60px;
        --spacing-xxl: 80px;
    }

    .nav-links {
        display: none;
    }

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

    .hero {
        padding-top: calc(70px + var(--spacing-lg));
        padding-bottom: var(--spacing-lg);
    }

    .hero-image {
        max-width: 280px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .lead {
        font-size: 1.1rem;
    }

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

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

    .method-item {
        padding: var(--spacing-sm);
    }

    .about-facts {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .social-link {
        font-size: 0.85rem;
        padding: 8px 14px;
    }

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

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

    .problem-card,
    .expertise-card,
    .service-card {
        padding: var(--spacing-md);
    }

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

    .contact-options {
        align-items: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --spacing-xxl: 64px;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: center;
    }

    .stat {
        text-align: center;
    }

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

    .btn {
        width: 100%;
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .hero-image {
        max-width: 220px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .problem-icon,
    .expertise-icon,
    .service-icon {
        font-size: 2rem;
    }

    .method-letter {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .download-preview {
        max-width: 200px;
    }

    .footer {
        padding: var(--spacing-lg) 0 var(--spacing-sm);
    }
}