/*
==========================================================================
1.  Root & Variables
    - Color Palette (Light & Dark)
    - Typography
    - Spacing & Sizing
    - Effects (Shadows, Transitions)
==========================================================================
*/

:root {
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-family-headings: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto,
    Helvetica, Arial, sans-serif;

  /* Light Theme */
  --color-background-primary: #fdfefe;
  --color-background-secondary: #f4f6f7;
  --color-background-accent: #ebf5fb;
  --color-surface-card: #ffffff;
  --color-text-primary: #17202a;
  --color-text-secondary: #566573;
  --color-text-on-primary: #ffffff;
  --color-primary-accent: #3498db;
  --color-primary-accent-darker: #2874a6;
  --color-secondary-accent: #85c1e9;
  --color-border-primary: #e5e7e9;
  --color-border-secondary: #d5d8dc;
  --color-success: #2ecc71;
  --color-shadow: rgba(40, 52, 65, 0.08);

  /* Sizing & Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-section: 96px;

  /* Typography Scale */
  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-md: 1.125rem; /* 18px */
  --font-size-lg: 1.25rem; /* 20px */
  --font-size-xl: 1.5rem; /* 24px */
  --font-size-xxl: 2rem; /* 32px */
  --font-size-xxxl: 2.75rem; /* 44px */
  --font-size-display: 3.5rem; /* 56px */

  /* Effects */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --shadow-sm: 0 2px 4px var(--color-shadow);
  --shadow-md: 0 4px 12px var(--color-shadow);
  --shadow-lg: 0 10px 30px var(--color-shadow);
  --transition-fast: 200ms ease-in-out;
  --transition-medium: 400ms ease-in-out;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background-primary: #17202a;
    --color-background-secondary: #1c2833;
    --color-background-accent: #212f3d;
    --color-surface-card: #283747;
    --color-text-primary: #fdfefe;
    --color-text-secondary: #aab7b8;
    --color-text-on-primary: #ffffff;
    --color-primary-accent: #5dade2;
    --color-primary-accent-darker: #85c1e9;
    --color-secondary-accent: #34495e;
    --color-border-primary: #34495e;
    --color-border-secondary: #425d78;
    --color-success: #2ecc71;
    --color-shadow: rgba(0, 0, 0, 0.2);
  }
}

/*
==========================================================================
2.  Base & Global Styles
==========================================================================
*/

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

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

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-headings);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-display);
}
h2 {
  font-size: var(--font-size-xxxl);
}
h3 {
  font-size: var(--font-size-xxl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}
ul,
ol {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}
li {
  margin-bottom: var(--spacing-sm);
}

/*
==========================================================================
3.  Reusable Components
    - Buttons
    - Section Headers
==========================================================================
*/

.button-primary,
.button-secondary {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: var(--font-size-base);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.button-primary {
  background-color: var(--color-primary-accent);
  color: var(--color-text-on-primary);
}

.button-primary:hover {
  background-color: var(--color-primary-accent-darker);
  color: var(--color-text-on-primary);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.button-secondary:hover {
  background-color: var(--color-primary-accent);
  color: var(--color-text-on-primary);
  text-decoration: none;
  transform: translateY(-2px);
}

.button-primary.large,
.button-secondary.large {
  padding: var(--spacing-lg) var(--spacing-xxl);
  font-size: var(--font-size-md);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-xxl);
}
.section-header h2 {
  margin-bottom: var(--spacing-md);
}
.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/*
==========================================================================
4.  Layout & Sections
==========================================================================
*/

/* Header */
.main-header {
  padding: var(--spacing-md) 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  transition: background-color var(--transition-medium),
    padding var(--transition-medium), box-shadow var(--transition-medium);
}

.main-header.scrolled {
  background-color: var(--color-surface-card);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-sm) 0;
}

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

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

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

.logo strong {
  font-weight: 800;
}

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

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: var(--font-size-base);
  position: relative;
  padding: var(--spacing-sm) 0;
}

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

.nav-links a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary-accent);
  transition: width var(--transition-fast);
}

.nav-links a:hover::after {
  width: 100%;
}

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

.mobile-menu-toggle svg {
  width: 30px;
  height: 30px;
  color: var(--color-text-primary);
}

/* Main Content */
main {
  padding-top: 100px; /* Placeholder for fixed header */
}

section {
  padding: var(--spacing-section) 0;
}

/* Hero Section */
.hero-section {
  padding-top: calc(var(--spacing-section) + 40px);
  padding-bottom: var(--spacing-section);
  background-color: var(--color-background-secondary);
}

.grid-two-columns,
.grid-two-columns-reversed {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
}

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

.hero-content .subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

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

/* Plans Section - Tabs */
.tabs-container {
  width: 100%;
}
.tabs-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border-primary);
}
.tab-link {
  padding: var(--spacing-md) var(--spacing-lg);
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: var(--font-size-md);
  transition: all var(--transition-fast);
  margin-bottom: -1px;
}
.tab-link:hover {
  color: var(--color-text-primary);
  background-color: var(--color-background-secondary);
}
.tab-link.active {
  color: var(--color-primary-accent);
  border-color: var(--color-primary-accent);
}

.tab-content {
  display: none;
  padding-top: var(--spacing-xl);
  animation: fadeIn 0.5s ease-in-out;
}
.tab-content.active {
  display: block;
}
.tab-content h3 {
  text-align: center;
  margin-bottom: var(--spacing-sm);
}
.tab-content > p {
  text-align: center;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-xl);
}

.plan-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.plan-card {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.plan-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.plan-card-header svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary-accent);
  flex-shrink: 0;
}

.plan-card-header h4 {
  margin-bottom: 0;
}

.plan-author {
  font-style: italic;
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

.plan-card ul {
  list-style: none;
  padding: 0;
}
.plan-card ul li {
  padding-left: var(--spacing-xl);
  position: relative;
}
.plan-card ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* Tool Section */
.section-tool {
  background-color: var(--color-background-secondary);
}

.tool-image-container img {
  border-radius: var(--border-radius-lg);
}

.features-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}
.features-list li {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}
.features-list svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary-accent);
  flex-shrink: 0;
  margin-top: var(--spacing-xs);
}
.features-list h4 {
  margin-bottom: var(--spacing-sm);
}

/* Why it Works Section */
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xxl);
  align-items: flex-start;
}
.why-card {
  background-color: var(--color-surface-card);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
}
.why-card img {
  border-radius: var(--border-radius-md);
  margin: 0 auto var(--spacing-lg);
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.why-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}
.content-block {
  display: flex;
  gap: var(--spacing-lg);
}
.content-block svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary-accent);
  flex-shrink: 0;
}
.content-block h5 {
  margin-bottom: var(--spacing-sm);
}

/* Testimonials Section */
.section-testimonials {
  background-color: var(--color-background-secondary);
}
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}
.testimonial-card {
  background-color: var(--color-surface-card);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border-left: 5px solid var(--color-primary-accent);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.testimonial-text {
  font-style: italic;
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-xl);
}
.testimonial-text::before {
  content: "“";
  font-family: Georgia, serif;
  font-size: 4rem;
  position: absolute;
  left: -10px;
  top: -20px;
  color: var(--color-border-primary);
  opacity: 0.5;
  z-index: 1;
}
.testimonial-author {
  text-align: right;
}
.testimonial-author strong {
  display: block;
  font-size: var(--font-size-base);
}
.testimonial-author span {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* FAQ Section */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}
.faq-accordion details {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-md);
}
.faq-accordion details[open] {
  border-color: var(--color-primary-accent);
}
.faq-accordion summary {
  padding: var(--spacing-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: var(--font-size-md);
  list-style: none; /* Remove marker */
}
.faq-accordion summary::marker,
.faq-accordion summary::-webkit-details-marker {
  display: none;
}
.faq-accordion summary svg {
  width: 24px;
  height: 24px;
  transition: transform var(--transition-fast);
}
.faq-accordion details[open] summary svg {
  transform: rotate(180deg);
}
.faq-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  border-top: 1px solid var(--color-border-primary);
}
.faq-more-link {
  text-align: center;
  margin-top: var(--spacing-xl);
}

/* CTA Section */
.section-cta {
  background-color: var(--color-primary-accent);
  text-align: center;
}
.section-cta h2,
.section-cta p {
  color: var(--color-text-on-primary);
}
.section-cta p {
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}
.section-cta .button-primary {
  background-color: var(--color-text-on-primary);
  color: var(--color-primary-accent);
}
.section-cta .button-primary:hover {
  background-color: var(--color-background-secondary);
}

/* Footer */
.main-footer {
  background-color: var(--color-background-secondary);
  padding-top: var(--spacing-xxl);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

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

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

.footer-column-links h5,
.footer-column-legal h5,
.footer-column-contact h5 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

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

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

.footer-column-links a:hover,
.footer-column-legal a:hover {
  color: var(--color-primary-accent);
}
.footer-column-contact address {
  font-style: normal;
  line-height: 1.8;
}

.footer-bottom {
  border-top: 1px solid var(--color-border-primary);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-surface-card);
  box-shadow: 0 -5px 15px var(--color-shadow);
  padding: var(--spacing-lg) 0;
  z-index: 2000;
  transform: translateY(100%);
  transition: transform var(--transition-medium);
  display: none;
}
.cookie-banner.visible {
  transform: translateY(0);
}
.cookie-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

/*
==========================================================================
5.  Animations & Utilities
==========================================================================
*/

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.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);
}

/*
==========================================================================
6.  Responsive Design
==========================================================================
*/

/* Tablet */
@media (min-width: 768px) {
  :root {
    --font-size-base: 17px;
  }
  .container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
  .grid-two-columns {
    grid-template-columns: 1fr 1fr;
  }
  .grid-two-columns-reversed {
    grid-template-columns: 1fr 1fr;
  }
  .grid-two-columns-reversed .tool-image-container {
    order: 2;
  }
  .plan-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-column-about {
    grid-column: 1 / -1;
  }
  .cookie-content {
    flex-direction: row;
    text-align: left;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  :root {
    --font-size-base: 18px;
  }
  .nav-links {
    display: flex;
  }
  .mobile-menu-toggle {
    display: none;
  }
  .grid-two-columns {
    grid-template-columns: 1.2fr 0.8fr;
    gap: calc(var(--spacing-xxl) * 2);
  }
  .grid-two-columns-reversed {
    grid-template-columns: 0.8fr 1.2fr;
    gap: calc(var(--spacing-xxl) * 2);
  }
  .why-grid {
    grid-template-columns: 0.8fr 1.2fr;
  }
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-xxl);
  }
  .footer-column-about {
    grid-column: auto;
  }
}

/* Mobile Menu Specifics */
@media (max-width: 1023.98px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-surface-card);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--color-border-primary);
  }
  .nav-links.active {
    display: flex;
  }
  .main-nav .button-primary {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .main-header.scrolled .mobile-menu-toggle {
    color: var(--color-text-primary);
  }
}

/* Large Desktop */
@media (min-width: 1440px) {
  :root {
    --spacing-section: 120px;
  }
  .container {
    max-width: 1320px;
  }
}