/* style.css */

/* 1. ROOT AND THEMES */
:root {
  /* Light Theme */
  --font-primary: "Helvetica Neue", Arial, sans-serif;
  --font-secondary: "Georgia", serif;

  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-card: #ffffff;
  --color-text-primary: #212529;
  --color-text-secondary: #5a6268;
  --color-text-muted: #868e96;
  --color-border: #dee2e6;
  --color-primary: #0056b3;
  --color-primary-hover: #004494;
  --color-secondary: #6c757d;
  --color-secondary-hover: #5a6268;
  --color-accent: #007bff;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-shadow: rgba(0, 0, 0, 0.05);
  --color-shadow-strong: rgba(0, 0, 0, 0.1);

  --spacing-xs: 4px;
  --spacing-s: 8px;
  --spacing-m: 16px;
  --spacing-l: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 64px;

  --border-radius: 8px;
  --border-radius-large: 12px;
  --transition-speed: 0.3s;
  --font-size-base: 16px;
  --font-size-h1: 2.8rem;
  --font-size-h2: 2.2rem;
  --font-size-h3: 1.5rem;
  --font-size-h4: 1.2rem;
  --line-height-base: 1.7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121212;
    --color-bg-alt: #1a1a1a;
    --color-bg-card: #1e1e1e;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #888888;
    --color-border: #333333;
    --color-primary: #4dabf7;
    --color-primary-hover: #74c0fc;
    --color-secondary: #adb5bd;
    --color-secondary-hover: #ced4da;
    --color-accent: #1e90ff;
    --color-shadow: rgba(255, 255, 255, 0.05);
    --color-shadow-strong: rgba(255, 255, 255, 0.1);
  }
}

/* 2. RESET AND BASE STYLES */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-primary);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-speed) ease,
    color var(--transition-speed) ease;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-m);
}

h1 {
  font-size: var(--font-size-h1);
}
h2 {
  font-size: var(--font-size-h2);
}
h3 {
  font-size: var(--font-size-h3);
}
h4 {
  font-size: var(--font-size-h4);
}

p {
  margin-bottom: var(--spacing-m);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

ul,
ol {
  padding-left: var(--spacing-l);
  margin-bottom: var(--spacing-m);
}

li {
  margin-bottom: var(--spacing-s);
}

/* 3. LAYOUT AND CONTAINER */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-l);
  padding-right: var(--spacing-l);
}

section {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl) auto;
}

.section-header h2 {
  margin-bottom: var(--spacing-s);
}

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

/* 4. HEADER AND NAVIGATION */
.main-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-m) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color var(--transition-speed) ease;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.main-nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--spacing-l);
}

.main-nav a {
  color: var(--color-text-secondary);
  font-weight: 500;
  text-decoration: none;
  padding: var(--spacing-s) 0;
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-speed) ease;
}

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

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

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

.mobile-menu-toggle svg {
  width: 32px;
  height: 32px;
  color: var(--color-text-primary);
}

/* 5. BUTTONS */
.button {
  display: inline-block;
  padding: var(--spacing-m) var(--spacing-l);
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  text-decoration: none;
}

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

.primary-button:hover {
  background-color: var(--color-primary-hover);
  color: white;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

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

.secondary-button:hover {
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
}

.large-button {
  padding: calc(var(--spacing-m) * 1.2) calc(var(--spacing-l) * 1.5);
  font-size: 1.1rem;
}

.full-width-button {
  width: 100%;
}

/* 6. HERO SECTION */
.hero-section {
  background-color: var(--color-bg-alt);
  text-align: center;
}

.hero-section .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-content {
  max-width: 800px;
  margin-bottom: var(--spacing-xl);
}

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

.hero-content .subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

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

.hero-image img {
  border-radius: var(--border-radius-large);
  box-shadow: 0 10px 30px var(--color-shadow-strong);
}

/* 7. FEATURES SECTION */
.features-section {
  background-color: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--spacing-l);
  border-radius: var(--border-radius);
  text-align: center;
  transition: transform var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px var(--color-shadow);
}

.feature-icon {
  margin-bottom: var(--spacing-m);
}

.feature-icon svg {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin: 0 auto;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-s);
}

.feature-card p {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* 8. HOW IT WORKS SECTION */
.how-it-works-section {
  background-color: var(--color-bg-alt);
}

.steps-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.steps-container::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 20px;
  bottom: 20px;
  width: 2px;
  background-color: var(--color-border);
}

.step {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.step:last-child {
  margin-bottom: 0;
}

.step-number {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  z-index: 1;
  border: 4px solid var(--color-bg-alt);
}

.step-content h3 {
  margin-top: var(--spacing-s);
}

/* 9. TARGET AUDIENCE SECTION (TABS) */
.tabs-container {
  max-width: 1000px;
  margin: 0 auto;
}

.tabs-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-s);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.tab-button {
  padding: var(--spacing-m) var(--spacing-l);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-speed) ease;
}

.tab-button:hover {
  color: var(--color-primary);
}

.tab-button.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-primary);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

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

.panel-content img {
  border-radius: var(--border-radius);
  object-fit: cover;
  height: 100%;
  max-height: 400px;
  width: auto;
  margin: 0 auto;
}

.panel-content ul {
  list-style-type: none;
  padding-left: 0;
}

.panel-content li {
  padding-left: var(--spacing-l);
  position: relative;
}

.panel-content li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* 10. CASE STUDY SECTION */
.case-study-section {
  background-color: var(--color-bg-alt);
}

.case-study-content {
  display: grid;
  gap: var(--spacing-xl);
}

.case-study-problem,
.case-study-solution {
  background-color: var(--color-bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.case-study-problem h4,
.case-study-solution h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-m);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-l);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.result-item {
  background-color: var(--color-bg);
  padding: var(--spacing-l);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.result-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

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

.case-study-quote {
  background-color: var(--color-bg-card);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-l);
  margin: 0;
  font-style: italic;
}

.case-study-quote p {
  margin: 0;
}

.case-study-quote footer {
  margin-top: var(--spacing-m);
  font-style: normal;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* 11. PRICING SECTION */
.pricing-section {
  background-color: var(--color-bg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  align-items: stretch;
}

.pricing-plan {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-large);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
  position: relative;
}

.pricing-plan.popular {
  border-color: var(--color-primary);
  transform: scale(1.05);
  box-shadow: 0 10px 30px var(--color-shadow-strong);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-m);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 700;
}

.plan-header {
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-l);
  margin-bottom: var(--spacing-l);
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.plan-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.plan-description {
  min-height: 40px;
}

.plan-features {
  list-style: none;
  padding: 0;
  margin-bottom: var(--spacing-l);
  flex-grow: 1;
}

.plan-features li {
  padding-left: var(--spacing-l);
  position: relative;
}

.plan-features li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* 12. TESTIMONIALS SECTION */
.testimonials-section {
  background-color: var(--color-bg-alt);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.testimonial-card {
  background-color: var(--color-bg-card);
  padding: var(--spacing-l);
  border-radius: var(--border-radius);
  border-top: 4px solid var(--color-primary);
  box-shadow: 0 5px 15px var(--color-shadow);
}

.testimonial-card p {
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-l);
  position: relative;
  padding-left: var(--spacing-l);
}

.testimonial-card p::before {
  content: "“";
  position: absolute;
  left: 0;
  top: -10px;
  font-size: 2.5rem;
  color: var(--color-border);
}

.testimonial-author {
  text-align: right;
}

.testimonial-author strong {
  display: block;
  color: var(--color-text-primary);
}

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

/* 13. TEAM SECTION */
.team-section {
  background-color: var(--color-bg);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.team-member {
  padding: var(--spacing-l);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-card);
}

.team-member h3 {
  margin-bottom: var(--spacing-xs);
}

.member-title {
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-m);
}

.member-bio {
  font-size: 0.95rem;
}

.team-cta {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* 14. FAQ SECTION (ACCORDION) */
.faq-section {
  background-color: var(--color-bg-alt);
}

.accordion {
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  width: 100%;
  background-color: var(--color-bg-card);
  border: none;
  text-align: left;
  padding: var(--spacing-l);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-speed) ease;
}

.accordion-header:hover {
  background-color: var(--color-bg);
}

.accordion-header svg {
  width: 24px;
  height: 24px;
  transition: transform var(--transition-speed) ease;
  flex-shrink: 0;
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out;
  background-color: var(--color-bg);
}

.accordion-content p {
  padding: var(--spacing-l);
  padding-top: 0;
  margin: 0;
}

.accordion-item.active .accordion-header svg {
  transform: rotate(180deg);
}

.faq-more {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* 15. CTA FORM SECTION */
.cta-form-section {
  background-color: var(--color-primary);
  color: white;
}

.cta-form-section .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
}

.cta-form-section h2 {
  color: white;
}

.cta-form-section p {
  color: rgba(255, 255, 255, 0.8);
}

.form-container {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-large);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.form-container h3 {
  text-align: center;
  margin-bottom: var(--spacing-l);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-s);
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: var(--spacing-m);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-alt);
  color: var(--color-text-primary);
  transition: border-color var(--transition-speed) ease,
    box-shadow var(--transition-speed) ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.form-terms {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--spacing-m);
}

.form-thank-you-message {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

/* 16. FOOTER */
.main-footer {
  background-color: var(--color-bg-alt);
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-l);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-column h4 {
  margin-bottom: var(--spacing-m);
  color: var(--color-text-primary);
}

.footer-column ul {
  list-style: none;
  padding: 0;
}

.footer-column li {
  margin-bottom: var(--spacing-s);
}

.footer-column a {
  color: var(--color-text-secondary);
}

.footer-column a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-column.about-column p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.contact-column address {
  font-style: normal;
  line-height: var(--line-height-base);
  color: var(--color-text-secondary);
}

.contact-column p {
  color: var(--color-text-secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-l);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* 17. ANIMATIONS */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 18. COOKIES BANNER */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  padding: var(--spacing-l);
  box-shadow: 0 -5px 15px var(--color-shadow);
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-l);
  transform: translateY(100%);
  animation: slideUp 0.5s forwards;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

.cookie-banner-content {
  max-width: 800px;
}

.cookie-banner button {
  flex-shrink: 0;
}

/* 19. MEDIA QUERIES */

@media (min-width: 768px) {
  .hero-section .container {
    flex-direction: row;
    text-align: left;
  }

  .hero-content {
    text-align: left;
  }

  .hero-cta {
    justify-content: flex-start;
  }

  .panel-content {
    grid-template-columns: 300px 1fr;
  }

  #tab3 .panel-content {
    grid-template-columns: 1fr;
  }

  .case-study-content {
    grid-template-columns: 1fr 1fr;
  }
  .case-study-results {
    grid-column: 1 / -1;
  }

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

@media (max-width: 992px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 5px 10px var(--color-shadow);
  }

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

  .main-nav ul {
    flex-direction: column;
    padding: var(--spacing-l);
    gap: 0;
  }

  .main-nav li {
    width: 100%;
  }

  .main-nav a {
    display: block;
    padding: var(--spacing-m) 0;
  }

  .main-nav a::after {
    display: none;
  }

  .main-header .button {
    display: none;
  }

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

  :root {
    --font-size-h1: 2.4rem;
    --font-size-h2: 2rem;
  }
}

@media (max-width: 576px) {
  :root {
    --font-size-h1: 2rem;
    --font-size-h2: 1.7rem;
  }

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

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

  .pricing-plan.popular {
    transform: scale(1);
  }

  .cookie-banner {
    flex-direction: column;
    text-align: center;
  }
}