/* 
 * style.css - RunCalc Unified Design System (Light Mode)
 * Modern, high-performance styling for running calculators.
 */

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

/* CSS Variables for Color Palette & Design System */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  
  --color-blue: #0066ff;
  --color-blue-hover: #0052cc;
  --color-blue-light: rgba(0, 102, 255, 0.06);
  --color-teal: #00d2c4;
  --color-teal-hover: #00b0a5;
  --color-teal-light: rgba(0, 210, 196, 0.08);

  --accent-orange: var(--color-blue);
  --accent-orange-hover: var(--color-blue-hover);
  --accent-orange-light: var(--color-teal-light);
  
  --accent-blue: #0284c7;
  --accent-blue-hover: #0369a1;
  --accent-blue-light: #e0f2fe;

  --accent-green: #10b981;
  --accent-green-hover: #047857;
  --accent-green-light: #d1fae5;
  
  --border-color: #e2e8f0;
  --border-focus: var(--color-blue);
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  background-image: 
      radial-gradient(circle at 1px 1px, #e2e8f0 1.5px, transparent 0),
      linear-gradient(135deg, rgba(0, 102, 255, 0.05) 0%, rgba(0, 210, 196, 0.05) 100%);
  background-size: 32px 32px, 100% 100%;
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Background Decoration Wrapper */
.bg-decoration {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -10;
  pointer-events: none;
}

/* Background Decorative Glow Blobs */
.glow-blob {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
  z-index: -10;
  pointer-events: none;
}

.glow-blob-1 {
  background: radial-gradient(circle, var(--color-blue) 0%, transparent 70%);
  top: -5%;
  left: -10%;
}

.glow-blob-2 {
  background: radial-gradient(circle, var(--color-teal) 0%, transparent 70%);
  top: 40%;
  right: -10%;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

a:hover {
  color: var(--accent-blue-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

/* Main Container Layout */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-wrap {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header & Navigation */
header.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.logo-icon {
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  color: white;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.logo-text span {
  color: var(--color-teal);
}

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav.main-nav a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease-in-out;
}

nav.main-nav a:hover, nav.main-nav a.active {
  color: var(--accent-orange);
  background-color: var(--accent-orange-light);
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
  }
  nav.main-nav ul {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 0.75rem;
  }
  nav.main-nav a {
    font-size: 0.85rem;
    padding: 0.2rem 0.4rem;
  }
}

/* Premium Two-Column Hero Layout */
.hero-section {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  align-items: center;
  gap: 3rem;
  padding: 3.5rem 0;
  margin-bottom: 2rem;
}

.hero-content {
  text-align: left;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-content h1 span {
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2.25rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-badges .badge {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hero-badges .badge-icon {
  font-size: 1rem;
}

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

.premium-hero-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.premium-hero-img:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

@media (max-width: 900px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    text-align: center;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-badges {
    justify-content: center;
  }
}

/* Grid Layout for Index */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

/* Cards & Elevated Containers */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  color: var(--text-main);
  text-decoration: none;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 102, 255, 0.3);
  color: var(--text-main);
  text-decoration: none;
}

.card-icon {
  background-color: var(--accent-orange-light);
  color: var(--accent-orange);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-btn {
  align-self: flex-start;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent-orange);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap 0.2s ease-in-out;
}

.card:hover .card-btn {
  gap: 0.5rem;
}

/* Placeholder card styles */
.card.placeholder {
  border-style: dashed;
  background-color: rgba(248, 250, 252, 0.4);
  opacity: 0.85;
}

.card.placeholder:hover {
  transform: none;
  box-shadow: var(--shadow-md);
  border-color: var(--border-color);
}

.card.placeholder .card-icon {
  background-color: var(--bg-tertiary);
  color: var(--text-light);
}

.badge-coming-soon {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background-color: var(--bg-tertiary);
  color: var(--text-light);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  letter-spacing: 0.05em;
}

/* Calculator Page Structures */
.calculator-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (min-width: 900px) {
  .calculator-layout {
    grid-template-columns: 420px 1fr;
  }
}

.calculator-panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  height: fit-content;
}

.results-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.calculator-title-section {
  margin-bottom: 2rem;
  max-width: 800px;
}

.calculator-title-section h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.calculator-title-section .subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  transition: all 0.2s ease-in-out;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--border-focus);
  background-color: var(--bg-secondary);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.15);
}

.input-suffix {
  position: relative;
}

.input-suffix input {
  padding-right: 3rem;
}

.input-suffix-text {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-light);
  pointer-events: none;
}

/* Buttons */
.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--color-blue), var(--color-teal));
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-blue-hover), var(--color-teal-hover));
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

/* Results Display Elements */
.results-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.results-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.results-header h2 {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
}

.result-metric {
  padding: 1rem;
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.result-metric .label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.result-metric .value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.15;
}

.result-metric .unit {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

/* Callouts & Alert Banners */
.alert-box {
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.alert-box.warning {
  background-color: var(--accent-orange-light);
  border-left: 4px solid var(--accent-orange);
  color: #7c2d12;
}

.alert-box.success {
  background-color: var(--accent-green-light);
  border-left: 4px solid var(--accent-green);
  color: #064e3b;
}

.alert-box.info {
  background-color: var(--accent-blue-light);
  border-left: 4px solid var(--accent-blue);
  color: #0c4a6e;
}

.alert-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.alert-content p {
  margin-bottom: 0.5rem;
}

.alert-content p:last-child {
  margin-bottom: 0;
}

/* Visual SVG Graph Elements */
.graph-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.graph-container h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.svg-chart {
  width: 100%;
  height: auto;
  overflow: visible;
}

.svg-chart text {
  font-family: var(--font-sans);
  font-size: 10px;
  fill: var(--text-light);
}

.svg-chart .grid-line {
  stroke: var(--border-color);
  stroke-width: 1;
  stroke-dasharray: 2,2;
}

.svg-chart .axis-line {
  stroke: var(--text-light);
  stroke-width: 1;
}

.svg-chart .line-path {
  fill: none;
  stroke: var(--accent-orange);
  stroke-width: 3;
  stroke-linecap: round;
}

.svg-chart .line-area {
  fill: url(#blue-teal-gradient);
  opacity: 0.15;
}

.svg-chart .wall-marker {
  stroke: #dc2626;
  stroke-width: 2;
  stroke-dasharray: 4,4;
}

/* Copywriting & Informative Content Sections */
.article-section {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 3rem;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.75rem;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  position: relative;
}

.article-content h2:first-of-type {
  margin-top: 0;
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.article-content p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.article-content ul, .article-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

/* Footer Styles */
footer.app-footer {
  background-color: var(--text-main);
  color: var(--border-color);
  border-top: 1px solid #334155;
  padding: 3rem 1.5rem;
  margin-top: 4rem;
  font-size: 0.95rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-brand h4 {
  color: white;
  font-size: 1.25rem;
  font-family: var(--font-display);
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: #94a3b8;
  max-width: 320px;
}

.footer-links {
  display: flex;
  gap: 3rem;
}

.footer-column h5 {
  color: white;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-column ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-column a {
  color: #94a3b8;
  transition: color 0.2s ease-in-out;
}

.footer-column a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 1.5rem;
  text-align: center;
  color: #64748b;
  font-size: 0.85rem;
  margin-top: 2rem;
  max-width: 1200px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

/* Pacing Predictor Table Styles */
.results-table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.results-table th, .results-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.results-table th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-main);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

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

.results-table tr.highlight td {
  background-color: var(--accent-orange-light);
  font-weight: 600;
}