/* ===================================
   SEO Analyzer - Premium Design System
   =================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@500;700&display=swap');

/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
  /* Color Palette - Premium Purple-Blue Gradient Theme */
  --color-primary: hsl(260, 85%, 65%);
  --color-primary-dark: hsl(260, 85%, 55%);
  --color-primary-light: hsl(260, 85%, 75%);
  --color-secondary: hsl(200, 90%, 60%);
  --color-accent: hsl(320, 85%, 65%);

  /* Semantic Colors */
  --color-success: hsl(142, 76%, 50%);
  --color-warning: hsl(38, 92%, 60%);
  --color-error: hsl(0, 84%, 60%);
  --color-info: hsl(200, 90%, 60%);

  /* Neutrals */
  --color-bg-primary: hsl(240, 20%, 8%);
  --color-bg-secondary: hsl(240, 15%, 12%);
  --color-bg-tertiary: hsl(240, 12%, 16%);
  --color-surface: hsla(240, 10%, 20%, 0.6);
  --color-surface-hover: hsla(240, 10%, 25%, 0.8);

  --color-text-primary: hsl(0, 0%, 98%);
  --color-text-secondary: hsl(0, 0%, 75%);
  --color-text-tertiary: hsl(0, 0%, 60%);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  --gradient-hero: linear-gradient(135deg, hsl(260, 85%, 20%) 0%, hsl(240, 60%, 10%) 50%, hsl(200, 70%, 15%) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', 'Inter', sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(147, 51, 234, 0.3);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===================================
   Base Styles & Reset
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

/* ===================================
   Layout Components
   =================================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-3xl) 0;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding: var(--space-2xl);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 50%, hsla(260, 85%, 65%, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, hsla(200, 90%, 60%, 0.15) 0%, transparent 50%);
  animation: pulseGlow 8s ease-in-out infinite;
}

@keyframes pulseGlow {

  0%,
  100% {
    opacity: 0.5;
    transform: scale(1);
  }

  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================
   Glassmorphism Card
   =================================== */
.glass-card {
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.glass-card:hover {
  background: var(--color-surface-hover);
  box-shadow: var(--shadow-glow);
  border-color: rgba(147, 51, 234, 0.3);
  transform: translateY(-5px);
}

/* ===================================
   Input Field
   =================================== */
.input-group {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.input-field {
  flex: 1;
  min-width: 300px;
  padding: var(--space-lg);
  font-size: var(--font-size-lg);
  font-family: var(--font-primary);
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  transition: all var(--transition-base);
  outline: none;
}

.input-field:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(147, 51, 234, 0.1);
}

.input-field::placeholder {
  color: var(--color-text-tertiary);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
  font-family: var(--font-primary);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ===================================
   Loading Spinner
   =================================== */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===================================
   Dashboard
   =================================== */
.dashboard {
  padding: var(--space-3xl) 0;
  display: none;
  animation: fadeIn 0.6s ease-out;
}

.dashboard.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.dashboard-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.score-display {
  display: inline-block;
  position: relative;
  width: 200px;
  height: 200px;
  margin: var(--space-xl) auto;
}

.score-circle {
  transform: rotate(-90deg);
}

.score-background {
  fill: none;
  stroke: var(--color-bg-tertiary);
  stroke-width: 12;
}

.score-progress {
  fill: none;
  stroke-width: 12;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease-out, stroke 0.5s ease;
}

.score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.score-value {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  display: block;
}

.score-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===================================
   Results Grid
   =================================== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.result-card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 2px solid transparent;
  transition: all var(--transition-base);
  animation: scaleIn 0.4s ease-out both;
}

.result-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-base);
}

.result-header:hover {
  opacity: 0.9;
}

.result-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: 0;
}

.result-icon {
  font-size: var(--font-size-2xl);
}

.result-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.toggle-icon {
  font-size: var(--font-size-lg);
  color: var(--color-text-tertiary);
  transition: transform var(--transition-base);
}

.result-card.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.result-score {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  min-width: 60px;
  text-align: center;
}

.result-score.excellent {
  background: hsla(142, 76%, 50%, 0.2);
  color: var(--color-success);
}

.result-score.good {
  background: hsla(200, 90%, 60%, 0.2);
  color: var(--color-info);
}

.result-score.warning {
  background: hsla(38, 92%, 60%, 0.2);
  color: var(--color-warning);
}

.result-score.poor {
  background: hsla(0, 84%, 60%, 0.2);
  color: var(--color-error);
}

.result-details {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  max-height: 1000px;
  overflow: hidden;
  transition: max-height var(--transition-slow) ease-in-out, opacity var(--transition-base);
  opacity: 1;
}

.result-card.collapsed .result-details {
  max-height: 0;
  opacity: 0;
}

.detail-item {
  padding: var(--space-sm) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  line-height: 1.6;
}

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

.detail-item span:not(.detail-icon) {
  word-wrap: break-word;
  overflow-wrap: break-word;
  flex: 1;
}

.detail-item strong {
  color: var(--color-primary-light);
  font-weight: 600;
}

.detail-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.detail-icon.success {
  color: var(--color-success);
}

.detail-icon.warning {
  color: var(--color-warning);
}

.detail-icon.error {
  color: var(--color-error);
}

/* ===================================
   Recommendations Section
   =================================== */
.recommendations-section {
  margin-top: var(--space-3xl);
  display: none;
}

.recommendations-section.active {
  display: block;
}

.recommendations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.recommendation-card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border-left: 4px solid var(--color-primary);
  transition: all var(--transition-base);
}

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

.recommendation-card[data-priority="critical"] {
  border-left-color: var(--color-error);
}

.recommendation-card[data-priority="high"] {
  border-left-color: var(--color-warning);
}

.recommendation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.priority-badge {
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.effort-badge {
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.recommendation-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.recommendation-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.recommendation-tips {
  background: var(--color-bg-tertiary);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.recommendation-tips strong {
  color: var(--color-primary-light);
  display: block;
  margin-bottom: var(--space-sm);
}

.recommendation-tips ul {
  margin: 0;
  padding-left: var(--space-lg);
  color: var(--color-text-secondary);
}

.recommendation-tips li {
  margin-bottom: var(--space-xs);
}

.recommendation-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: var(--font-size-sm);
}

.impact-badge,
.score-badge {
  color: var(--color-text-tertiary);
}

/* ===================================
   History Section
   =================================== */
.history-section {
  padding: var(--space-2xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.history-item {
  background: var(--color-bg-tertiary);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.history-item:hover {
  background: var(--color-surface);
  transform: translateX(5px);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.history-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-left: var(--space-sm);
}

.history-score {
  font-size: var(--font-size-xl);
  font-weight: 700;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
}

.history-url {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
}

.history-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.btn-small {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.btn-small:hover {
  background: var(--color-surface);
}

.btn-small.btn-primary {
  background: var(--gradient-primary);
}

.empty-state {
  padding: var(--space-3xl);
  text-align: center;
}

/* ===================================
   Features Section
   =================================== */
.features-section {
  padding: var(--space-4xl) var(--space-xl);
  background: var(--color-bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--color-bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.feature-card h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-lg);
}

.feature-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  font-size: var(--font-size-sm);
}

/* ===================================
   FAQ Section
   =================================== */
.faq-section {
  padding: var(--space-4xl) var(--space-xl);
  background: var(--color-bg-secondary);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-tertiary);
  transition: all var(--transition-base);
}

.faq-item:hover {
  background: var(--color-surface);
}

.faq-question {
  width: 100%;
  padding: var(--space-lg);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-base);
}

.faq-question:hover {
  color: var(--color-primary-light);
}

.faq-icon {
  color: var(--color-primary);
  transition: transform var(--transition-base);
  font-size: var(--font-size-lg);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow) ease-in-out;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ===================================
   Export Section
   =================================== */
.export-section {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  margin-top: var(--space-2xl);
}

/* ===================================
   Utilities
   =================================== */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--space-xs);
}

.mt-2 {
  margin-top: var(--space-sm);
}

.mt-3 {
  margin-top: var(--space-md);
}

.mt-4 {
  margin-top: var(--space-lg);
}

.mb-1 {
  margin-bottom: var(--space-xs);
}

.mb-2 {
  margin-bottom: var(--space-sm);
}

.mb-3 {
  margin-bottom: var(--space-md);
}

.mb-4 {
  margin-bottom: var(--space-lg);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .glass-card {
    padding: var(--space-xl);
  }

  .input-group {
    flex-direction: column;
  }

  .input-field {
    min-width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .results-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .score-display {
    width: 150px;
    height: 150px;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
  }

  .result-card {
    padding: var(--space-md);
  }
}