/* style.css */

/* ------------------- */
/* 1. Global Variables & Themes */
/* ------------------- */
:root {
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-secondary: "Roboto Slab", serif;

  /* Light Theme Colors */
  --color-background: #fdfdfe;
  --color-surface: #ffffff;
  --color-primary: #005f73;
  --color-primary-variant: #0a9396;
  --color-secondary: #94d2bd;
  --color-accent: #ee9b00;
  --color-text-primary: #1e293b;
  --color-text-secondary: #475569;
  --color-border: #e2e8f0;
  --color-shadow: rgba(100, 116, 139, 0.12);
  --color-success: #007f5f;
  --color-error: #d00000;

  /* Spacing & Sizing */
  --spacing-xs: 0.25rem; /* 4px */
  --spacing-sm: 0.5rem; /* 8px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 2rem; /* 32px */
  --spacing-xl: 4rem; /* 64px */
  --spacing-xxl: 8rem; /* 128px */

  /* Typography */
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-h1: 3.052rem;
  --font-size-h2: 2.441rem;
  --font-size-h3: 1.953rem;
  --font-size-h4: 1.563rem;
  --line-height-base: 1.65;

  /* Borders & Shadows */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --box-shadow-sm: 0 2px 4px 0 var(--color-shadow);
  --box-shadow-md: 0 4px 8px -2px var(--color-shadow),
    0 2px 4px -2px var(--color-shadow);
  --box-shadow-lg: 0 10px 15px -3px var(--color-shadow),
    0 4px 6px -4px var(--color-shadow);

  /* Transitions */
  --transition-fast: 200ms ease-in-out;
  --transition-medium: 350ms ease-in-out;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-primary: #5eead4;
    --color-primary-variant: #99f6e4;
    --color-secondary: #22d3ee;
    --color-accent: #facc15;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-success: #34d399;
    --color-error: #f87171;
  }
}

/* ------------------- */
/* 2. Base Styles & Reset */
/* ------------------- */
*,
*::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);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-secondary);
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

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-md);
  max-width: 75ch;
  color: var(--color-text-secondary);
}

/* ------------------- */
/* 3. Layout & Container */
/* ------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

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

@media (min-width: 768px) {
  section {
    padding-top: var(--spacing-xxl);
    padding-bottom: var(--spacing-xxl);
  }
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-xl);
}

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

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* ------------------- */
/* 4. Buttons & CTA */
/* ------------------- */
.cta-button {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: background-color var(--transition-medium),
    transform var(--transition-fast), box-shadow var(--transition-medium);
  border: none;
  font-size: var(--font-size-base);
  line-height: 1.5;
}

.cta-button.primary-cta {
  background-color: var(--color-primary);
  color: var(--color-surface);
  box-shadow: var(--box-shadow-md);
}

.cta-button.primary-cta:hover {
  background-color: var(--color-primary-variant);
  transform: translateY(-2px);
  box-shadow: var(--box-shadow-lg);
  text-decoration: none;
  color: var(--color-surface);
}

.cta-button.header-cta {
  background-color: var(--color-primary-variant);
  color: var(--color-surface);
  font-size: var(--font-size-sm);
  padding: 0.6rem 1.2rem;
}

.cta-button.header-cta:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
  text-decoration: none;
}

/* ------------------- */
/* 5. Header & Navigation */
/* ------------------- */
.main-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--box-shadow-sm);
}

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

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  font-family: var(--font-secondary);
}

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

.main-nav ul {
  display: flex;
  gap: var(--spacing-lg);
}

.main-nav a {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--spacing-sm) 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-medium);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text-primary);
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .main-nav,
  .header-cta {
    display: none;
  }
}

/* Mobile Menu styles will be added here if needed, managed by JS */

/* ------------------- */
/* 6. Hero Section */
/* ------------------- */
.hero-section {
  background-color: var(--color-surface);
  padding-top: var(--spacing-xl);
}

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

.hero-content h1 {
  max-width: 20ch;
  margin-left: auto;
  margin-right: auto;
}

.hero-content p {
  font-size: var(--font-size-lg);
  max-width: 65ch;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-lg);
}

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

@media (min-width: 992px) {
  .hero-section .container {
    grid-template-columns: repeat(2, 1fr);
    text-align: left;
  }

  .hero-content h1,
  .hero-content p {
    margin-left: 0;
    margin-right: 0;
  }
}

/* ------------------- */
/* 7. Benefits Section */
/* ------------------- */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.benefit-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  transition: transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-md);
}

.benefit-card svg {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  background-color: color-mix(in srgb, var(--color-primary) 10%, transparent);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-md);
}

.benefit-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

@media (min-width: 768px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .benefits-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ------------------- */
/* 8. Video Lessons Section */
/* ------------------- */
.video-lessons-section {
  background-color: var(--color-surface);
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.video-card {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  box-shadow: var(--box-shadow-sm);
  transition: transform var(--transition-medium),
    box-shadow var(--transition-medium);
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-md);
}

.video-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.video-card-content {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.video-category {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary-variant);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
}

.video-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

.learn-more-link {
  display: inline-block;
  margin-top: auto;
  font-weight: 600;
  color: var(--color-primary);
}

.learn-more-link:hover {
  text-decoration-thickness: 2px;
}

@media (min-width: 768px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ------------------- */
/* 9. In-depth Guides (Accordion) */
/* ------------------- */
.accordion details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  transition: background-color var(--transition-medium);
}

.accordion details[open] {
  background-color: color-mix(
    in srgb,
    var(--color-primary) 3%,
    var(--color-surface)
  );
}

.accordion summary {
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  font-size: var(--font-size-xl);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none; /* For Safari */
}

.accordion summary::-webkit-details-marker {
  display: none; /* For Chrome */
}

.accordion summary h3 {
  font-size: var(--font-size-lg);
  margin: 0;
}

.accordion summary svg {
  width: 24px;
  height: 24px;
  transition: transform var(--transition-medium);
  color: var(--color-primary);
}

.accordion details[open] summary svg {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-sm);
}

.accordion-content p,
.accordion-content ul,
.accordion-content ol {
  margin-bottom: var(--spacing-md);
}

.accordion-content h4 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.accordion-content ul li,
.accordion-content ol li {
  padding-left: var(--spacing-md);
  position: relative;
  margin-bottom: var(--spacing-sm);
}

.accordion-content ul li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.accordion-content ol {
  list-style: none;
  counter-reset: custom-counter;
}

.accordion-content ol li::before {
  counter-increment: custom-counter;
  content: counter(custom-counter) ". ";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* ------------------- */
/* 10. Case Studies Section */
/* ------------------- */
.case-studies-section {
  background-color: var(--color-surface);
}

.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.case-study-card {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
}

.case-study-tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-md);
  background-color: color-mix(in srgb, var(--color-error) 15%, transparent);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.case-study-tag.solution-tag {
  background-color: color-mix(in srgb, var(--color-success) 15%, transparent);
  color: var(--color-success);
  border-color: var(--color-success);
}

.case-study-card h4 {
  font-size: var(--font-size-xl);
}

@media (min-width: 1024px) {
  .case-studies-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ------------------- */
/* 11. Downloads Section */
/* ------------------- */
.downloads-section {
  background-color: var(--color-primary);
  color: var(--color-background);
}

.downloads-section h2 {
  color: var(--color-surface);
}

.downloads-section p {
  color: var(--color-secondary);
}

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

.downloads-list {
  margin-top: var(--spacing-lg);
  text-align: left;
}

.downloads-list li {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  transition: transform var(--transition-fast);
}

.downloads-list li:hover {
  transform: scale(1.02);
}

.downloads-list a {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  color: var(--color-text-primary);
  font-weight: 500;
}

.downloads-list a:hover {
  text-decoration: none;
  color: var(--color-primary-variant);
}

.downloads-list svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* ------------------- */
/* 12. FAQ Section */
/* ------------------- */
.faq-section {
  background-color: var(--color-surface);
}

.faq-accordion {
  max-width: 900px;
  margin: 0 auto;
}

.faq-accordion details {
  border: none;
  border-bottom: 1px solid var(--color-border);
  border-radius: 0;
  margin-bottom: 0;
}

.faq-accordion summary {
  padding: var(--spacing-lg) 0;
}

.faq-accordion summary span {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text-primary);
}

.faq-accordion details[open] summary span {
  color: var(--color-primary);
}

.faq-accordion summary svg {
  transition: transform var(--transition-medium);
}

.faq-accordion details[open] summary svg {
  transform: rotate(45deg);
}

.faq-accordion details p {
  padding-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

/* ------------------- */
/* 13. Registration Form Section */
/* ------------------- */
.registration-form-section {
  text-align: center;
}

.quick-reg-form {
  margin-top: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.quick-reg-form .form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.quick-reg-form input[type="email"] {
  width: 100%;
  padding: 0.9rem 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.quick-reg-form input[type="email"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px
    color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.form-privacy-notice {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
}

#form-thank-you-message {
  background-color: color-mix(in srgb, var(--color-success) 10%, transparent);
  border: 1px solid var(--color-success);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

#form-thank-you-message h3 {
  color: var(--color-success);
}

@media (min-width: 768px) {
  .quick-reg-form .form-group {
    flex-direction: row;
  }

  .quick-reg-form input[type="email"] {
    flex-grow: 1;
  }
}

/* ------------------- */
/* 14. Footer */
/* ------------------- */
.main-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

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

.footer-column h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-primary);
  font-weight: 600;
}

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

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

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

.about-column p {
  font-size: var(--font-size-sm);
}

.footer-column address {
  font-style: normal;
  line-height: 1.8;
}

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

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }
}

/* ------------------- */
/* 15. Animation Utilities */
/* ------------------- */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ------------------- */
/* 16. Cookie Banner */
/* ------------------- */
.cookie-consent-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  box-shadow: 0 -2px 10px var(--color-shadow);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  transform: translateY(100%);
  transition: transform 0.5s ease-in-out;
}

.cookie-consent-banner.active {
  transform: translateY(0);
}

.cookie-consent-text {
  text-align: center;
  font-size: var(--font-size-sm);
}

.cookie-consent-text p {
  margin: 0;
}

.cookie-consent-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

.cookie-consent-button {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 500;
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.cookie-accept-button {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

.cookie-accept-button:hover {
  background-color: var(--color-primary-variant);
}

.cookie-decline-button {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.cookie-decline-button:hover {
  background-color: var(--color-border);
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  .cookie-consent-banner {
    flex-direction: row;
  }
  .cookie-consent-text {
    text-align: left;
  }
}