:root {
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol";
  --font-secondary: "Georgia", "Times New Roman", serif;
  --font-monospace: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono",
    monospace;

  --ease-in-out-quad: cubic-bezier(0.455, 0.03, 0.515, 0.955);
  --ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);
  --ease-in-out-cubic: cubic-bezier(0.645, 0.045, 0.355, 1);

  --transition-fast: all 0.2s var(--ease-out-quart);
  --transition-medium: all 0.35s var(--ease-in-out-cubic);
  --transition-slow: all 0.5s var(--ease-in-out-cubic);
}

[data-theme="light"] {
  --color-background: #f8f9fa;
  --color-surface: #ffffff;
  --color-primary: #0d6efd;
  --color-primary-variant: #0a58ca;
  --color-secondary: #6c757d;
  --color-secondary-variant: #5a6268;
  --color-accent: #198754;
  --color-accent-variant: #157347;
  --color-text-primary: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;
  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  --color-shadow: rgba(0, 0, 0, 0.05);
  --color-shadow-heavy: rgba(0, 0, 0, 0.1);
  --color-overlay: rgba(248, 249, 250, 0.85);
}

[data-theme="dark"] {
  --color-background: #121212;
  --color-surface: #1e1e1e;
  --color-primary: #4d94ff;
  --color-primary-variant: #7aafff;
  --color-secondary: #adb5bd;
  --color-secondary-variant: #ced4da;
  --color-accent: #20c997;
  --color-accent-variant: #48d2a9;
  --color-text-primary: #e9ecef;
  --color-text-secondary: #ced4da;
  --color-text-muted: #868e96;
  --color-border: #343a40;
  --color-border-light: #2c3034;
  --color-shadow: rgba(0, 0, 0, 0.2);
  --color-shadow-heavy: rgba(0, 0, 0, 0.4);
  --color-overlay: rgba(30, 30, 30, 0.85);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  line-height: 1.65;
  font-weight: 400;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.75em;
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
}

h4 {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
}

h5 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
}

p {
  margin-bottom: 1.5rem;
  max-width: 75ch;
  color: var(--color-text-secondary);
}

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

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

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

ul,
ol {
  padding-left: 20px;
  margin-bottom: 1.5rem;
}

li {
  margin-bottom: 0.75rem;
  padding-left: 10px;
  color: var(--color-text-secondary);
}

ul {
  list-style: none;
}

ul li::before {
  content: "•";
  color: var(--color-primary);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1.3em;
  font-size: 1.2em;
  position: relative;
  top: 0.05em;
}

section {
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 5vw, 5rem);
  width: 100%;
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
}

.section-divider {
  height: 1px;
  width: 80%;
  max-width: 1200px;
  margin: 0 auto;
  background-color: var(--color-border-light);
  border: 0;
}

.section-description {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  max-width: 80ch;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  margin-bottom: 4rem;
  color: var(--color-text-muted);
}

.cta-button,
.cta-button-secondary {
  display: inline-block;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition-medium);
  border: 2px solid transparent;
  user-select: none;
}

.cta-button {
  background-color: var(--color-primary);
  color: #ffffff;
}

.cta-button:hover {
  background-color: var(--color-primary-variant);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(13, 110, 253, 0.2);
  text-decoration: none;
}

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

.cta-button-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(13, 110, 253, 0.15);
  text-decoration: none;
}

.main-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem clamp(1rem, 5vw, 5rem);
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition-medium);
  border-bottom: 1px solid transparent;
}

header.scrolled {
  box-shadow: 0 4px 30px var(--color-shadow);
  border-bottom-color: var(--color-border-light);
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo b {
  color: var(--color-primary);
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s var(--ease-out-quart);
}

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.hero {
  text-align: center;
  padding-bottom: clamp(4rem, 10vw, 8rem);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero .subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--color-text-muted);
  max-width: 70ch;
  margin: 0 auto 3rem auto;
  line-height: 1.7;
}

.hero-image-container {
  margin-top: 4rem;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px -10px var(--color-shadow-heavy);
}

.hero-image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.introduction {
  background-color: var(--color-surface);
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
}

.intro-card {
  background-color: var(--color-background);
  padding: 2.5rem;
  border-radius: 12px;
  border: 1px solid var(--color-border-light);
  transition: var(--transition-medium);
}

.intro-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px -5px var(--color-shadow);
  border-color: var(--color-border);
}

.intro-card svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.intro-card h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.intro-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

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

.tabs-container {
  max-width: 1200px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--color-border);
}

.tab-button {
  padding: 1rem 1.5rem;
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: var(--transition-fast);
  transform: translateY(1px);
}

.tab-button svg {
  width: 20px;
  height: 20px;
  transition: var(--transition-fast);
}

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

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

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

.tab-content {
  display: none;
  animation: fadeIn 0.6s var(--ease-in-out-cubic);
}

.tab-content.active {
  display: block;
}

.tab-content h3 {
  margin-bottom: 1.5rem;
}

.tab-content ul {
  margin-top: 2rem;
}

.interactive-planner-promo {
  background-color: var(--color-surface);
}

.planner-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  max-width: 1300px;
  margin: 0 auto;
}

.planner-image-container {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px -15px var(--color-shadow-heavy);
}

.planner-image-container img {
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.planner-text h2 {
  margin-bottom: 1.5rem;
}

.planner-text ul {
  margin-top: 2rem;
  margin-bottom: 2.5rem;
}

.resources-list h2 {
  text-align: center;
}

.accordion {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.accordion details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  transition: var(--transition-medium);
}

.accordion details[open] {
  border-color: var(--color-border);
}

.accordion details summary {
  padding: 1.5rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
}

.accordion details summary::-webkit-details-marker {
  display: none;
}

.accordion details summary h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 500;
}

.accordion details summary span {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: var(--transition-medium);
  position: relative;
  padding-right: 25px;
}

.accordion details summary span::after {
  content: "+";
  font-family: var(--font-monospace);
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--color-primary);
  transition: transform 0.3s var(--ease-out-quart);
}

.accordion details[open] summary span::after {
  transform: translateY(-50%) rotate(45deg);
}

.accordion-content {
  padding: 0 1.5rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-border-light);
}

.resource-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border-light);
}

.resource-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.resource-item:first-child {
  padding-top: 1rem;
}

.resource-item h4 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.resource-item p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.testimonials {
  background-color: var(--color-surface);
}

.testimonials h2 {
  text-align: center;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.testimonial-card {
  background-color: var(--color-background);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
}

.testimonial-card p {
  font-family: var(--font-secondary);
  font-size: 1.1rem;
  font-style: italic;
  flex-grow: 1;
  color: var(--color-text-primary);
}

.testimonial-card footer {
  margin-top: 1.5rem;
  font-family: var(--font-primary);
  font-style: normal;
  font-weight: 500;
  color: var(--color-text-muted);
}

.testimonial-card footer::before {
  content: "—";
  margin-right: 0.5rem;
}

.faq-section {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.faq-container {
  text-align: left;
  margin-top: 3rem;
  margin-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.faq-item summary {
  padding: 1.5rem 0;
  font-size: 1.2rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 30px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--color-secondary);
  transition: transform 0.3s var(--ease-out-quart);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item p {
  padding-bottom: 1.5rem;
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.link-more-faq {
  font-weight: 500;
}

.subscription-form-section {
  background-color: var(--color-surface);
}

.subscription-content {
  max-width: 1100px;
  margin: 0 auto;
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: 16px;
  padding: clamp(2rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3rem;
}

.subscription-text h3 {
  color: #ffffff;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.subscription-text p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 0;
  max-width: 50ch;
}

#newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

#newsletter-form .form-group {
  display: flex;
  flex-direction: column;
}

#newsletter-form label {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: rgba(255, 255, 255, 0.9);
}

#newsletter-form input {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--color-primary-variant);
  background-color: #ffffff;
  color: var(--color-text-primary);
  font-size: 1rem;
  font-family: var(--font-primary);
  transition: var(--transition-fast);
}

#newsletter-form input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(25, 135, 84, 0.3);
}

#newsletter-form button {
  background-color: var(--color-accent);
  color: #ffffff;
  border: none;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition-medium);
  margin-top: 0.5rem;
}

#newsletter-form button:hover {
  background-color: var(--color-accent-variant);
  transform: translateY(-2px);
}

#form-thank-you {
  background-color: var(--color-accent);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
}

#form-thank-you h4 {
  color: #ffffff;
  margin-bottom: 1rem;
}

#form-thank-you p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 0;
}

.site-footer {
  background-color: var(--color-surface);
  padding: clamp(3rem, 6vw, 5rem) clamp(1rem, 5vw, 5rem);
  padding-bottom: 2rem;
  color: var(--color-text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  max-width: 1600px;
  margin: 0 auto 3rem auto;
}

.footer-column h4 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-primary);
}

.footer-column h5 {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-primary);
}

.footer-column p {
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

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

.footer-column ul li {
  margin-bottom: 1rem;
  padding-left: 0;
}

.footer-column ul li::before {
  display: none;
}

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

.footer-column ul a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.footer-image-container {
  width: 100px;
  opacity: 0.5;
  margin-top: 2rem;
}

.footer-column address {
  font-style: normal;
  line-height: 1.8;
  font-size: 0.9rem;
}

.footer-column address a {
  display: block;
  margin-top: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: 2rem;
  text-align: center;
  max-width: 1600px;
  margin: 0 auto;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  padding: 1.5rem 2rem;
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  box-shadow: 0 -5px 20px var(--color-shadow);
  transform: translateY(100%);
  transition: transform 0.5s var(--ease-in-out-cubic);
}

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

.cookie-banner p {
  margin: 0;
  text-align: center;
}

.cookie-banner a {
  font-weight: 500;
}

#accept-cookies {
  padding: 0.6rem 1.5rem;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

#accept-cookies:hover {
  background-color: var(--color-primary-variant);
}

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

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

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

@media (max-width: 1024px) {
  .planner-content {
    grid-template-columns: 1fr;
  }
  .planner-image-container {
    order: -1;
  }
  .subscription-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .subscription-text p {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  .main-navigation {
    flex-direction: column;
    gap: 1.5rem;
  }
  .nav-links {
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  .tab-buttons {
    flex-direction: column;
    border-bottom: none;
  }
  .tab-button {
    width: 100%;
    justify-content: flex-start;
    border: 1px solid var(--color-border-light);
    border-radius: 8px;
  }
  .tab-button.active {
    border-color: var(--color-primary);
    background-color: var(--color-surface);
  }
  .testimonial-grid {
    grid-template-columns: 1fr;
  }
  .cookie-banner {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #121212;
    --color-surface: #1e1e1e;
    --color-primary: #4d94ff;
    --color-primary-variant: #7aafff;
    --color-secondary: #adb5bd;
    --color-secondary-variant: #ced4da;
    --color-accent: #20c997;
    --color-accent-variant: #48d2a9;
    --color-text-primary: #e9ecef;
    --color-text-secondary: #ced4da;
    --color-text-muted: #868e96;
    --color-border: #343a40;
    --color-border-light: #2c3034;
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-shadow-heavy: rgba(0, 0, 0, 0.4);
    --color-overlay: rgba(30, 30, 30, 0.85);
  }
  #newsletter-form input {
    background-color: var(--color-border);
    color: var(--color-text-primary);
    border-color: var(--color-border);
  }
  #newsletter-form input::placeholder {
    color: var(--color-text-muted);
  }
  #newsletter-form input:focus {
    background-color: var(--color-background);
    box-shadow: 0 0 0 3px rgba(32, 201, 151, 0.3);
  }
  .planner-image-container img {
    opacity: 0.85;
  }
  .hero-image-container {
    box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.5);
  }
  .intro-card {
    background-color: var(--color-surface);
  }
  .intro-card:hover {
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.3);
  }
  .testimonial-card {
    background-color: var(--color-surface);
  }
}

/* Fallback for no JS */
.no-js .tab-content {
  display: block;
}

.no-js .cookie-banner {
  display: flex;
}