/*
 * ClearBudget - Custom Stylesheet
 * Version: 1.0
 */

/* ------------------- */
/* 1. VARIABLES & THEMES
/* ------------------- */

:root {
  /* Light Theme Palette */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f9fc;
  --color-bg-tertiary: #f0f3f8;
  --color-surface: #ffffff;
  --color-text-primary: #0d1a2e;
  --color-text-secondary: #4a5568;
  --color-text-muted: #718096;
  --color-border: #e2e8f0;
  --color-accent-primary: #3b82f6;
  --color-accent-primary-hover: #2563eb;
  --color-accent-secondary: #10b981;
  --color-accent-secondary-hover: #059669;
  --color-positive: #16a34a;
  --color-negative: #dc2626;
  --color-shadow: rgba(13, 26, 46, 0.08);

  /* Typography */
  --font-family-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-serif: "Lora", serif;
  --font-family-mono: "Fira Code", monospace;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Scalable Font Sizes */
  --font-size-xs: clamp(0.75rem, 0.5vw + 0.65rem, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.5vw + 0.775rem, 1rem);
  --font-size-base: clamp(1rem, 0.5vw + 0.9rem, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1vw + 0.9rem, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1vw + 1.05rem, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.5vw + 1.125rem, 2rem);
  --font-size-3xl: clamp(1.875rem, 2.5vw + 1.25rem, 2.75rem);
  --font-size-4xl: clamp(2.25rem, 4vw + 1.5rem, 4rem);

  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;

  /* Borders & Radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-full: 9999px;

  /* Transitions */
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow),
    0 2px 4px -2px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow),
    0 4px 6px -4px var(--color-shadow);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #0d1a2e;
    --color-bg-secondary: #122238;
    --color-bg-tertiary: #1a2c47;
    --color-surface: #122238;
    --color-text-primary: #f0f3f8;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #718096;
    --color-border: #2d3748;
    --color-accent-primary: #60a5fa;
    --color-accent-primary-hover: #93c5fd;
    --color-accent-secondary: #34d399;
    --color-accent-secondary-hover: #6ee7b7;
    --color-shadow: rgba(0, 0, 0, 0.2);
  }
}

/* ------------------- */
/* 2. GLOBAL STYLES
/* ------------------- */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-medium),
    color var(--transition-medium);
}

.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-6);
  padding-right: var(--spacing-6);
}

section {
  padding-top: var(--spacing-20);
  padding-bottom: var(--spacing-20);
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-4);
  text-wrap: balance;
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-4);
  color: var(--color-text-secondary);
  max-width: 75ch;
}

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

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  margin-bottom: var(--spacing-4);
}

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

/* ------------------- */
/* 3. BUTTONS
/* ------------------- */

.button-primary,
.button-secondary {
  display: inline-block;
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius-full);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--transition-medium);
  border: 2px solid transparent;
  text-decoration: none;
  text-align: center;
}

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

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

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

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

.button-primary.large,
.button-secondary.large {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

.button-primary.full-width {
  width: 100%;
  display: block;
}

/* ------------------- */
/* 4. HEADER
/* ------------------- */

.main-header {
  padding: var(--spacing-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(
    in srgb,
    var(--color-bg-primary) 80%,
    transparent
  );
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-medium);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  text-decoration: none;
  color: var(--color-text-primary);
}

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

.logo svg {
  color: var(--color-accent-primary);
}

.main-nav ul {
  display: flex;
  list-style-type: none;
  gap: var(--spacing-8);
}

.main-nav a {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  text-decoration: none;
  position: relative;
  padding: var(--spacing-2) 0;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-fast);
}

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

.main-nav a:hover::after {
  transform: scaleX(1);
}

/* ------------------- */
/* 5. HERO SECTION
/* ------------------- */

.hero-section {
  padding-top: var(--spacing-24);
  padding-bottom: var(--spacing-24);
}

.hero-section .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--spacing-16);
}

.hero-content h1 {
  margin-bottom: var(--spacing-6);
}

.hero-content .subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-8);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-4);
  margin-top: var(--spacing-10);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

/* ------------------- */
/* 6. FEATURES SECTION
/* ------------------- */

.what-is-section {
  background-color: var(--color-bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
}

.feature-card {
  background-color: var(--color-surface);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: var(--transition-medium);
}

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

.feature-card svg {
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-6);
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-3);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-left: auto;
  margin-right: auto;
}

/* ------------------- */
/* 7. ACCORDION (GLOSSARY & FAQ)
/* ------------------- */

.glossary-section,
.faq-section {
  background-color: var(--color-bg-primary);
}

.accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.accordion-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.accordion-header {
  width: 100%;
  padding: var(--spacing-5) var(--spacing-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background-color: transparent;
  border: none;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-align: left;
}

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

.accordion-header svg {
  transition: transform var(--transition-medium);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

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

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.accordion-content p {
  margin-bottom: 0;
  font-size: var(--font-size-base);
}

.accordion-content .content-inner {
  padding: 0 var(--spacing-6) var(--spacing-6) var(--spacing-6);
}

/* ------------------- */
/* 8. TABS & DATA VIZ
/* ------------------- */

.data-viz-section {
  background-color: var(--color-bg-secondary);
}

.tabs-container {
  max-width: 1000px;
  margin: 0 auto;
}

.tabs-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-2);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-8);
}

.tab-button {
  padding: var(--spacing-3) var(--spacing-6);
  border: none;
  background: none;
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  position: relative;
  border-bottom: 3px solid transparent;
  transform: translateY(1px);
  transition: var(--transition-medium);
}

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

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

.tab-panel {
  display: none;
  animation: fadeIn 0.5s ease-in-out;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.chart-image {
  border-radius: var(--border-radius-lg);
  margin: var(--spacing-8) auto;
  box-shadow: var(--shadow-md);
}

.chart-description {
  text-align: center;
  font-style: italic;
  color: var(--color-text-muted);
  max-width: 70ch;
  margin: var(--spacing-4) auto 0 auto;
}

/* ------------------- */
/* 9. TABLE
/* ------------------- */

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
}

.budget-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.budget-table th,
.budget-table td {
  padding: var(--spacing-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.budget-table thead th {
  background-color: var(--color-bg-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  position: sticky;
  top: 0;
}

.budget-table tbody tr:last-child td {
  border-bottom: none;
}

.budget-table tbody tr:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

.budget-table tbody tr:hover {
  background-color: var(--color-bg-tertiary);
}

.budget-table .category-header td {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  background-color: var(--color-bg-tertiary);
  font-size: var(--font-size-base);
}

.budget-table tfoot td {
  font-weight: var(--font-weight-bold);
  background-color: var(--color-bg-secondary);
}

.budget-table .positive {
  color: var(--color-positive);
}

.budget-table .negative {
  color: var(--color-negative);
}

.budget-table td:nth-child(3),
.budget-table td:nth-child(4),
.budget-table td:nth-child(5) {
  text-align: right;
  font-family: var(--font-family-mono);
}

.budget-table th:nth-child(3),
.budget-table th:nth-child(4),
.budget-table th:nth-child(5) {
  text-align: right;
}

/* ------------------- */
/* 10. OPTIMIZATION TIPS
/* ------------------- */

.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-10);
}

.tip-card {
  display: flex;
  gap: var(--spacing-6);
  align-items: flex-start;
}

.tip-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background-color: color-mix(
    in srgb,
    var(--color-accent-secondary) 15%,
    transparent
  );
  border-radius: var(--border-radius-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.tip-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent-secondary);
}

.tip-content h4 {
  margin-bottom: var(--spacing-2);
}

.tip-content p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ------------------- */
/* 11. FINAL CTA & FORM
/* ------------------- */

.final-cta-section {
  background-color: var(--color-bg-secondary);
  text-align: center;
}

.final-cta-section h2 {
  margin-bottom: var(--spacing-4);
}

.final-cta-section p {
  max-width: 65ch;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-10);
}

.registration-form-container {
  max-width: 480px;
  margin: 0 auto;
  background-color: var(--color-surface);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: left;
}

#register-form h3 {
  text-align: center;
  margin-bottom: var(--spacing-8);
}

.form-group {
  margin-bottom: var(--spacing-5);
}

.form-group label {
  display: block;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
}

.form-group input {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px
    color-mix(in srgb, var(--color-accent-primary) 25%, transparent);
}

.terms {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

#thank-you-message {
  text-align: center;
  padding: var(--spacing-8);
}

#thank-you-message h3 {
  color: var(--color-accent-secondary);
}

/* ------------------- */
/* 12. FOOTER
/* ------------------- */

.main-footer {
  background-color: var(--color-bg-secondary);
  padding-top: var(--spacing-16);
  padding-bottom: var(--spacing-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-12);
}

.footer-column h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-4);
  color: var(--color-text-primary);
}

.footer-column p,
.footer-column address,
.footer-column ul {
  color: var(--color-text-muted);
}

.footer-column.about p {
  max-width: 40ch;
}

.footer-column ul {
  list-style-type: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-6);
  text-align: center;
  color: var(--color-text-muted);
}

/* ------------------- */
/* 13. COOKIE NOTICE
/* ------------------- */

#cookie-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  padding: var(--spacing-5) var(--spacing-6);
  z-index: 200;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-6);
  box-shadow: 0 -2px 10px var(--color-shadow);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

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

#cookie-notice p {
  margin: 0;
  font-size: var(--font-size-sm);
}

#cookie-accept {
  padding: var(--spacing-2) var(--spacing-4);
  background-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
  border: none;
  border-radius: var(--border-radius-full);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

#cookie-accept:hover {
  background-color: var(--color-accent-primary-hover);
}

/* ------------------- */
/* 14. SCROLL ANIMATIONS
/* ------------------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ------------------- */
/* 15. RESPONSIVENESS
/* ------------------- */

/* Large Desktops (1200px) */
@media (max-width: 1200px) {
  .container {
    max-width: 1024px;
  }
  .features-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Tablets (992px) */
@media (max-width: 992px) {
  .main-header .button-primary {
    display: none;
  }
  .main-nav {
    margin-left: auto;
  }
  .hero-section .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content .subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-image {
    grid-row: 1;
    margin-bottom: var(--spacing-10);
  }
  .tips-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-column.about {
    grid-column: 1 / -1;
  }
}

/* Small Tablets & Large Phones (768px) */
@media (max-width: 768px) {
  body {
    font-size: 0.95rem;
  }
  section {
    padding-top: var(--spacing-16);
    padding-bottom: var(--spacing-16);
  }
  .container {
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
  }
  .main-header {
    padding: var(--spacing-3) 0;
  }
  .main-nav ul {
    gap: var(--spacing-4);
  }
  .hero-section {
    padding-top: var(--spacing-12);
    padding-bottom: var(--spacing-12);
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer-column.contact address,
  .footer-column.about p {
    margin: 0 auto;
  }
  #cookie-notice {
    flex-direction: column;
    gap: var(--spacing-4);
    text-align: center;
  }
}

/* Mobile Phones (576px) */
@media (max-width: 576px) {
  .main-nav {
    display: none; /* In a real scenario, a hamburger menu would be implemented here */
  }
  .logo span {
    display: none;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .tabs-nav {
    flex-direction: column;
    gap: 0;
    border-bottom: none;
  }
  .tab-button {
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    width: 100%;
  }
  .tab-button.active {
    border-bottom-color: var(--color-accent-primary);
  }
  .registration-form-container {
    padding: var(--spacing-6);
  }
}