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

:root {
  /* Colors - Strictly Muted Tones */
  --bg-color: #fbfbfb;
  --surface-color: #ffffff;
  
  --text-main: #2b2b2b;
  --text-light: #666666;
  
  /* Muted Red, Green, Yellow */
  --primary-green: #90b892; /* Muted Green */
  --primary-green-hover: #7ea480;
  
  --accent-yellow: #ead694; /* Muted Yellow */
  --accent-yellow-hover: #d2bf80;
  
  --action-red: #d29191; /* Muted Red */
  --action-red-hover: #bb7f7f;

  --border-color: #e5e5e5;
  --border-focus: #b5b5b5;

  /* Typography */
  --font-family: 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* Borders & Shadows - Soft and Minimal */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-main);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* Header */
.site-header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  font-family: var(--font-family);
}

.btn-primary {
  background-color: var(--primary-green);
  color: #1a331b;
}

.btn-primary:hover {
  background-color: var(--primary-green-hover);
}

.btn-secondary {
  background-color: var(--accent-yellow);
  color: #3b3113;
}

.btn-secondary:hover {
  background-color: var(--accent-yellow-hover);
}

.btn-danger {
  background-color: var(--action-red);
  color: #3f1a1a;
}

.btn-danger:hover {
  background-color: var(--action-red-hover);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--text-light);
  background-color: var(--bg-color);
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 5rem 0 3rem;
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* Ecosystem Grid */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.card h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

.card p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

/* Invoice Generator App */
.invoice-app {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (max-width: 900px) {
  .invoice-app {
    grid-template-columns: 1fr;
  }
}

.panel {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
}

.panel-title {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-row {
  display: flex;
  gap: var(--spacing-md);
}

@media (max-width: 600px) {
  .form-row {
    flex-direction: column;
    gap: 0;
  }
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--text-light);
}

.form-control {
  width: 100%;
  padding: 0.6rem;
  font-family: var(--font-family);
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--surface-color);
  color: var(--text-main);
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
}

textarea.form-control {
  resize: vertical;
  min-height: 80px;
}

/* Line Items */
.line-items-wrapper {
  margin: var(--spacing-lg) 0;
}

.line-items-header {
  display: grid;
  grid-template-columns: 3fr 1fr 1fr 1fr 40px;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-light);
}

.line-item {
  display: grid;
  grid-template-columns: 3fr 1fr 1fr 1fr 40px;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  align-items: start;
}

/* Invoice Preview (A4 Proportion) */
.preview-container {
  background-color: #f2f2f2;
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: center;
  overflow-x: auto;
}

.invoice-preview-sheet {
  background-color: white;
  width: 210mm; /* A4 width */
  min-height: 297mm; /* A4 height */
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  padding: 20mm;
  font-family: 'Helvetica', 'Arial', sans-serif;
  color: #000;
  position: relative;
}

/* Scale down preview for visual fit without affecting PDF */
.invoice-preview-sheet.scaled {
  transform-origin: top center;
  transform: scale(0.65);
  margin-bottom: -35%;
}

@media (max-width: 1200px) {
  .invoice-preview-sheet.scaled {
    transform: scale(0.5);
    margin-bottom: -50%;
  }
}

/* Internal Invoice Styles for Preview */
.inv-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.inv-title {
  font-size: 32px;
  font-weight: bold;
  letter-spacing: 2px;
  color: #333;
}

.inv-logo-placeholder {
  width: 120px;
  height: 60px;
  background-color: #f5f5f5;
  border: 1px dashed #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 12px;
}
.inv-logo-img {
  max-width: 150px;
  max-height: 80px;
  object-fit: contain;
}

.inv-meta {
  text-align: right;
  font-size: 14px;
}

.inv-meta table {
  margin-left: auto;
}

.inv-meta th {
  text-align: right;
  padding-right: 15px;
  color: #666;
  font-weight: normal;
}

.inv-addresses {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
  font-size: 14px;
  line-height: 1.5;
}

.inv-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  font-size: 14px;
}

.inv-table th {
  background-color: #f9f9f9;
  border-bottom: 2px solid #333;
  padding: 10px;
  text-align: left;
}

.inv-table td {
  padding: 10px;
  border-bottom: 1px solid #eee;
}

.inv-table th.col-right,
.inv-table td.col-right {
  text-align: right;
}

.inv-totals {
  width: 300px;
  margin-left: auto;
  font-size: 14px;
}

.inv-totals-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid #eee;
}

.inv-totals-row.grand-total {
  font-weight: bold;
  font-size: 18px;
  border-bottom: 2px solid #333;
  border-top: 2px solid #333;
}

.inv-notes {
  margin-top: 50px;
  font-size: 12px;
  color: #666;
}

/* Affiliate Promo */
.affiliate-promo {
  text-align: center;
  background-color: var(--surface-color);
  border: 1px solid var(--primary-green);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.affiliate-promo h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.affiliate-disclosure {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: var(--spacing-sm);
}

/* Footer */
.site-footer {
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-col h4 {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-light);
}

.footer-links a:hover {
  color: var(--text-main);
}

.copyright {
  text-align: center;
  color: var(--text-light);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
@media (max-width: 600px) {
  .copyright {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}