/* ========== TOKENS ========== */
:root {
  --primary: #F97316;
  --primary-light: #FFF7ED;
  --primary-dark: #EA580C;
  --text: #1A1A1A;
  --text-muted: #6B7280;
  --success: #16A34A;
  --success-light: #DCFCE7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --blue: #3B82F6;
  --blue-light: #DBEAFE;
  --border: #E5E7EB;
  --bg: #FFFFFF;
  --bg-gray: #F9FAFB;
  --radius: 8px;
  --radius-sm: 6px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
input, textarea, button, select { font-family: inherit; font-size: inherit; }
fieldset { border: none; }
img { max-width: 100%; }

/* ========== UTILITIES ========== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--text-muted); }
.text-right { text-align: right; }

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm); font-weight: 600;
  font-size: 14px; cursor: pointer; border: 2px solid transparent;
  transition: all 0.15s ease; white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-outline { background: #fff; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--text); }
.btn-danger { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-danger:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); padding: 6px 10px; }
.btn-ghost:hover { background: var(--bg-gray); }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; }
.btn-link { background: none; border: none; color: var(--primary); font-weight: 600; cursor: pointer; font-size: 14px; padding: 8px 0; }
.btn-link:hover { color: var(--primary-dark); }

/* ========== NAV ========== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.logo-icon {
  width: 32px; height: 32px; background: var(--primary); color: #fff;
  border-radius: var(--radius-sm); display: flex; align-items: center;
  justify-content: center; font-weight: 700; font-size: 16px;
}
.logo-icon-sm { width: 24px; height: 24px; font-size: 12px; }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links .btn { font-size: 14px; }
.nav-links .btn-primary { color: #fff; }
.nav-links .btn-primary:hover { color: #fff; }
.nav-links .btn-sm { padding: 4px 12px; font-size: 12px; }
.nav-billing { font-size: 12px; color: var(--text-muted); cursor: pointer; background: none; border: none; padding: 0; }
.nav-billing:hover { color: var(--primary); }

.plan-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 700; letter-spacing: 0.5px; }
.plan-free { background: var(--border); color: var(--text-muted); }
.plan-pro { background: var(--primary); color: #fff; }

.upgrade-prompt { text-align: center; padding: 80px 24px; max-width: 500px; margin: 0 auto; }
.upgrade-prompt h2 { margin-bottom: 12px; }
.upgrade-prompt p { color: var(--text-muted); margin-bottom: 24px; }

/* ========== HERO ========== */
.hero { background: var(--primary-light); padding: 80px 0; }
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.hero-badge {
  display: inline-block; background: #fff; padding: 6px 16px; border-radius: 999px;
  font-size: 14px; color: var(--text-muted); margin-bottom: 24px;
}
.hero h1 { font-size: 48px; line-height: 1.1; margin-bottom: 20px; letter-spacing: -0.02em; }
.hero-sub { font-size: 18px; color: var(--text-muted); margin-bottom: 32px; max-width: 480px; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-card { flex: 0 0 420px; }

/* Sample invoice card */
.sample-invoice { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg); overflow: hidden; }
.si-header {
  background: var(--primary); color: #fff; padding: 16px 24px;
  display: flex; align-items: center; gap: 10px;
}
.si-title { font-weight: 700; font-size: 16px; flex: 1; }
.si-number { font-size: 14px; opacity: 0.9; }
.si-body { padding: 24px; }
.si-parties { display: flex; justify-content: space-between; margin-bottom: 20px; font-size: 14px; }
.si-parties small { display: block; color: var(--text-muted); font-size: 12px; margin-bottom: 4px; }
.si-table { width: 100%; font-size: 14px; border-collapse: collapse; margin-bottom: 16px; }
.si-table thead td { color: var(--text-muted); font-size: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.si-table tbody td { padding: 8px 0; border-bottom: 1px solid var(--border); }
.si-total { display: flex; justify-content: space-between; align-items: center; padding-top: 12px; font-size: 16px; }
.si-total-amount { font-size: 24px; font-weight: 700; }
.si-due { text-align: right; font-size: 13px; margin-top: 8px; }

/* ========== SECTIONS ========== */
.section { padding: 80px 24px; max-width: 1200px; margin: 0 auto; }
.section-gray { background: var(--bg-gray); max-width: 100%; padding-left: 24px; padding-right: 24px; }
.section-gray > * { max-width: 1200px; margin-left: auto; margin-right: auto; }
.section-title { font-size: 36px; text-align: center; margin-bottom: 12px; letter-spacing: -0.02em; }
.section-sub { text-align: center; color: var(--text-muted); font-size: 18px; margin-bottom: 48px; }

/* How It Works */
.comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.comparison-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; background: #fff; }
.comparison-badge {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 600; margin-bottom: 24px;
}
.comparison-badge-old { background: var(--danger-light); color: var(--danger); }
.comparison-badge-new { background: var(--success-light); color: var(--success); }
.comparison-list { counter-reset: step; }
.comparison-list li {
  counter-increment: step; padding: 10px 0; border-bottom: 1px solid var(--border);
  font-size: 15px; display: flex; align-items: center; gap: 12px;
}
.comparison-list li::before {
  content: counter(step); width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600; flex-shrink: 0;
}
.comparison-old .comparison-list li::before { background: var(--danger-light); color: var(--danger); }
.comparison-new .comparison-list li::before { background: var(--success-light); color: var(--success); }
.comparison-list li:last-child { border-bottom: none; }
.comparison-tagline { margin-top: 24px; font-weight: 600; font-size: 15px; }

/* Pricing */
.pricing-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 800px; margin: 0 auto; }
.pricing-card {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 32px;
  background: #fff; position: relative;
}
.pricing-card-pro { border-color: var(--primary); border-width: 2px; }
.pricing-recommended {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--primary); color: #fff; font-size: 11px; font-weight: 700;
  padding: 4px 16px; border-radius: 999px; letter-spacing: 0.05em;
}
.pricing-card h3 { font-size: 20px; margin-bottom: 8px; }
.pricing-price { font-size: 48px; font-weight: 800; margin-bottom: 8px; }
.pricing-price span { font-size: 16px; font-weight: 400; color: var(--text-muted); }
.pricing-desc { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }
.pricing-features { margin-bottom: 24px; }
.pricing-features li { padding: 6px 0; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.pricing-features li::before { content: "\2714"; color: var(--success); font-weight: 700; }

/* ========== DASHBOARD ========== */
.dashboard-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; padding-top: 40px; }
.dashboard-header h1 { font-size: 28px; margin-bottom: 4px; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 32px; }
.stat-card {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 20px;
  background: #fff;
}
.stat-card .stat-label { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.stat-card .stat-value { font-size: 28px; font-weight: 700; }
.stat-card .stat-value.paid { color: var(--success); }
.stat-card .stat-value.unpaid { color: var(--primary); }
.stat-card .stat-value.overdue { color: var(--danger); }

.filter-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.filter-tab {
  padding: 10px 20px; font-size: 14px; font-weight: 500; cursor: pointer;
  color: var(--text-muted); border-bottom: 2px solid transparent; background: none; border-top: none; border-left: none; border-right: none;
}
.filter-tab:hover { color: var(--text); }
.filter-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

.invoice-list { display: flex; flex-direction: column; gap: 8px; padding-bottom: 60px; }
.invoice-row {
  display: flex; align-items: center; padding: 16px 20px; border: 1px solid var(--border);
  border-radius: var(--radius); background: #fff; gap: 16px;
}
.invoice-row:hover { box-shadow: var(--shadow); }
.inv-number { font-weight: 700; font-size: 15px; min-width: 100px; }
.inv-status {
  font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  text-transform: capitalize;
}
.inv-status.draft { background: var(--bg-gray); color: var(--text-muted); }
.inv-status.sent { background: var(--blue-light); color: var(--blue); }
.inv-status.paid { background: var(--success-light); color: var(--success); }
.inv-status.overdue { background: var(--danger-light); color: var(--danger); }
.inv-client { flex: 1; font-size: 15px; }
.inv-meta { color: var(--text-muted); font-size: 13px; min-width: 200px; }
.inv-amount { font-weight: 700; font-size: 16px; text-align: right; min-width: 100px; }
.inv-items-count { color: var(--text-muted); font-size: 12px; text-align: right; }
.inv-actions { display: flex; gap: 6px; }

.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-muted);
}
.empty-state h3 { font-size: 18px; color: var(--text); margin-bottom: 8px; }
.empty-state p { margin-bottom: 20px; }

/* ========== CREATE INVOICE ========== */
#page-create h1 { font-size: 28px; margin-bottom: 4px; padding-top: 40px; }
#page-create > .container > .text-muted { margin-bottom: 32px; }

.create-layout { display: grid; grid-template-columns: 1fr 400px; gap: 40px; align-items: flex-start; }
.form-section {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 20px; background: #fff;
}
.form-section legend { font-size: 16px; font-weight: 700; margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 14px; background: #fff;
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group textarea:focus { outline: none; border-color: var(--primary); }
.checkbox-label { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.checkbox-label input { width: auto; }

/* Logo upload */
.logo-upload {
  display: flex; align-items: center; gap: 12px;
  border: 2px dashed var(--border); border-radius: var(--radius-sm);
  padding: 12px 16px; cursor: pointer; position: relative;
  transition: border-color 0.15s;
}
.logo-upload:hover { border-color: var(--primary); }
.logo-preview {
  width: 48px; height: 48px; border-radius: var(--radius-sm);
  background: var(--bg-gray); display: flex; align-items: center;
  justify-content: center; overflow: hidden; flex-shrink: 0;
}
.logo-preview img { width: 100%; height: 100%; object-fit: contain; }
.logo-upload-text { flex: 1; }
.logo-upload-text small { display: block; margin-top: 2px; }
.btn-remove-logo {
  width: 24px; height: 24px; border-radius: 50%; border: none;
  background: var(--danger-light); color: var(--danger); cursor: pointer;
  font-size: 14px; display: flex; align-items: center; justify-content: center;
  z-index: 2; position: relative;
}
.btn-remove-logo:hover { background: var(--danger); color: #fff; }

/* Line items */
.line-items-header {
  display: flex; gap: 8px; font-size: 11px; font-weight: 700; color: var(--text-muted);
  padding-bottom: 8px; border-bottom: 1px solid var(--border); margin-bottom: 8px; letter-spacing: 0.05em;
}
.li-desc { flex: 1; }
.li-qty { width: 60px; }
.li-rate { width: 80px; }
.li-amount { width: 80px; text-align: right; }
.li-action { width: 32px; }

.line-item-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.line-item-row input { padding: 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; }
.line-item-row input:focus { outline: none; border-color: var(--primary); }
.line-item-row .li-desc input { width: 100%; }
.line-item-row .li-qty input { width: 60px; text-align: center; }
.line-item-row .li-rate input { width: 80px; text-align: right; }
.line-item-row .li-amount { font-size: 14px; font-weight: 500; }
.btn-remove-line {
  width: 28px; height: 28px; border-radius: 50%; border: none;
  background: var(--danger-light); color: var(--danger); cursor: pointer;
  font-size: 14px; display: flex; align-items: center; justify-content: center;
}
.btn-remove-line:hover { background: var(--danger); color: #fff; }

.form-actions { display: flex; gap: 12px; justify-content: flex-end; padding: 20px 0 60px; }

/* Live preview */
.create-preview { position: sticky; top: 80px; }
.preview-label { font-size: 12px; font-weight: 700; color: var(--text-muted); letter-spacing: 0.05em; margin-bottom: 12px; }
.invoice-preview {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: #fff; box-shadow: var(--shadow); overflow: hidden;
}

/* Preview inner styles */
.preview-bar { height: 6px; background: var(--primary); }
.preview-header { padding: 20px 24px 0; display: flex; justify-content: space-between; }
.preview-title { font-size: 18px; font-weight: 800; }
.preview-inv-number { font-size: 13px; color: var(--text-muted); }
.preview-dates { font-size: 12px; color: var(--text-muted); text-align: right; }
.preview-parties { display: flex; justify-content: space-between; padding: 16px 24px; font-size: 13px; }
.preview-parties small { display: block; font-size: 11px; color: var(--text-muted); margin-bottom: 2px; text-transform: uppercase; letter-spacing: 0.05em; }
.preview-parties .party-name { font-weight: 700; }
.preview-table { width: 100%; font-size: 12px; border-collapse: collapse; margin: 0 24px; width: calc(100% - 48px); }
.preview-table thead td {
  font-size: 10px; font-weight: 700; color: var(--text-muted);
  padding: 8px 0; border-bottom: 1px solid var(--border); letter-spacing: 0.05em;
}
.preview-table tbody td { padding: 6px 0; border-bottom: 1px solid var(--border); }
.preview-totals { padding: 12px 24px 20px; font-size: 13px; text-align: right; }
.preview-totals .preview-total-row { display: flex; justify-content: flex-end; gap: 24px; padding: 4px 0; }
.preview-totals .preview-grand-total { font-weight: 700; font-size: 15px; }
.preview-totals .preview-grand-total .text-primary { font-size: 15px; }

/* ========== VIEW INVOICE ========== */
.invoice-view-header {
  display: flex; align-items: center; gap: 16px; padding: 40px 0 24px;
}
.invoice-view-header .back-link { color: var(--text-muted); font-size: 14px; }
.invoice-view-header .back-link:hover { color: var(--primary); }
.invoice-view-header h2 { font-size: 22px; font-weight: 700; }
.invoice-view-header .btn { margin-left: auto; }

.invoice-document {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: #fff; box-shadow: var(--shadow); max-width: 800px;
  margin: 0 auto 60px; overflow: hidden;
}
.inv-doc-bar { height: 6px; background: var(--primary); }
.inv-doc-inner { padding: 40px; }
.inv-doc-header { display: flex; justify-content: space-between; margin-bottom: 32px; }
.inv-doc-title { font-size: 32px; font-weight: 800; color: var(--primary); }
.inv-doc-number { font-size: 14px; color: var(--text-muted); margin-top: 4px; }
.inv-doc-from { text-align: right; font-size: 14px; }
.inv-doc-from strong { display: block; font-size: 16px; }
.inv-doc-parties { display: flex; justify-content: space-between; margin-bottom: 32px; }
.inv-doc-party small {
  display: block; font-size: 11px; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px;
}
.inv-doc-party strong { display: block; font-size: 16px; margin-bottom: 4px; }
.inv-doc-party div { font-size: 14px; color: var(--text-muted); }
.inv-doc-table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }
.inv-doc-table thead th {
  text-align: left; font-size: 11px; font-weight: 700; color: var(--text-muted);
  padding: 10px 0; border-bottom: 2px solid var(--primary); letter-spacing: 0.05em;
}
.inv-doc-table thead th:last-child { text-align: right; }
.inv-doc-table tbody td { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.inv-doc-table tbody td:last-child { text-align: right; }
.inv-doc-totals { text-align: right; font-size: 14px; }
.inv-doc-totals .total-row { padding: 4px 0; }
.inv-doc-totals .grand-total { font-size: 18px; font-weight: 700; margin-top: 8px; }
.inv-doc-notes { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 14px; color: var(--text-muted); }
.inv-doc-notes strong { display: block; color: var(--text); margin-bottom: 4px; }

.payment-details-box { margin-top: 24px; padding: 16px 20px; background: var(--primary-light); border: 1px solid var(--border); border-radius: 8px; font-size: 13px; line-height: 1.8; }
.payment-details-box strong { display: block; font-size: 14px; margin-bottom: 4px; color: var(--text); }
.payment-details-box small { color: var(--text-muted); margin-right: 4px; }
.payment-details-box a { word-break: break-all; }

/* ========== AUTH ========== */
.auth-container {
  min-height: calc(100vh - 60px); display: flex; align-items: center;
  justify-content: center; padding: 40px 24px; background: var(--bg-gray);
}
.auth-card {
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: 40px; width: 100%; max-width: 420px;
}
.auth-logo { display: flex; align-items: center; gap: 10px; justify-content: center; margin-bottom: 32px; font-weight: 700; font-size: 20px; }
.auth-tabs { display: flex; gap: 0; margin-bottom: 24px; border-bottom: 1px solid var(--border); }
.auth-tab {
  flex: 1; padding: 10px; text-align: center; font-weight: 600; font-size: 14px;
  cursor: pointer; background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--text-muted);
}
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.auth-error {
  background: var(--danger-light); color: var(--danger); padding: 10px 14px;
  border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 16px;
}
#auth-form .form-group { margin-bottom: 16px; }
#auth-form .btn { margin-top: 8px; }
.auth-footer-text { text-align: center; font-size: 13px; color: var(--text-muted); margin-top: 20px; }
.auth-footer-text a { font-weight: 600; margin-left: 4px; }

/* Nav user menu */
.nav-user { display: flex; align-items: center; gap: 12px; }
.nav-user-email { font-size: 13px; color: var(--text-muted); max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.btn-logout { font-size: 13px; color: var(--text-muted); background: none; border: 1px solid var(--border); padding: 4px 12px; border-radius: var(--radius-sm); cursor: pointer; }
.btn-logout:hover { color: var(--danger); border-color: var(--danger); }

/* ========== FOOTER ========== */
.footer { border-top: 1px solid var(--border); padding: 48px 0 0; margin-top: 0; }
.footer-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
}
.footer-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; margin-bottom: 12px; }
.footer-brand p { color: var(--text-muted); font-size: 14px; max-width: 300px; }
.footer-col h4 { font-size: 14px; margin-bottom: 12px; }
.footer-col a { display: block; font-size: 14px; color: var(--text-muted); padding: 3px 0; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  max-width: 1200px; margin: 32px auto 0; padding: 20px 24px;
  border-top: 1px solid var(--border); text-align: center;
  font-size: 13px; color: var(--text-muted);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .hero-inner { flex-direction: column; gap: 40px; }
  .hero h1 { font-size: 32px; }
  .hero-card { flex: none; width: 100%; }
  .hero-ctas { flex-direction: column; }
  .comparison { grid-template-columns: 1fr; }
  .pricing-cards { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .create-layout { grid-template-columns: 1fr; }
  .create-preview { position: static; }
  .form-row { grid-template-columns: 1fr; }
  .invoice-row { flex-wrap: wrap; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
}