/* =========================================================
   India GST Invoice & Quotation Generator
   Premium SaaS UI Stylesheet (Final, Single File)
   ========================================================= */

/* Base & Reset */
:root {
  --accent-color: #4f46e5; /* default blue */
  --text-color: #111827;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --muted: #6b7280;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #f59e0b;
}

html, body {
  height: 100%;
}

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text-color);
  background: var(--bg-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; }
img { display: block; max-width: 100%; }

/* Layout helpers */
.max-w-7xl { max-width: 80rem; margin: 0 auto; }
.max-w-3xl { max-width: 48rem; margin: 0 auto; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-3 { padding-top: .75rem; padding-bottom: .75rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.mt-2 { margin-top: .5rem; }
.mt-3 { margin-top: .75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: .5rem; }
.mb-3 { margin-bottom: .75rem; }
.gap-2 { gap: .5rem; }
.gap-3 { gap: .75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem 1rem;
  border-radius: .5rem;
  font-size: .95rem;
  transition: all .2s ease;
}

.btn-primary {
  background: var(--accent-color);
  color: #fff;
}
.btn-primary:hover { filter: brightness(0.95); }

.btn-secondary {
  background: #111827;
  color: #fff;
}
.btn-secondary:hover { filter: brightness(0.9); }

.btn-outline {
  border: 1px solid var(--border-color);
  color: #374151;
  background: #fff;
}
.btn-outline:hover { background: #f3f4f6; }

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: 1rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  padding: 1.5rem;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: 0 12px 28px rgba(0,0,0,0.10); }

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: .75rem;
}
.card-desc {
  font-size: .95rem;
  color: var(--muted);
}

/* Feature cards (home) */
.mockup-card {
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.proof-card {
  height: 120px;
  border-radius: .75rem;
  background: linear-gradient(135deg, #eef2ff, #f8fafc);
  border: 1px solid var(--border-color);
}

/* Sections */
.section { margin-top: 1.5rem; }
.section-title { font-size: 1rem; font-weight: 600; margin-bottom: .5rem; }

/* Labels & Inputs */
.label {
  display: block;
  font-size: .9rem;
  color: #374151;
  margin-bottom: .25rem;
}

.input, .textarea, .select {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: .5rem;
  padding: .5rem .75rem;
  font-size: .95rem;
  color: #111827;
  background: #fff;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

.input-file {
  display: block;
  width: 100%;
  font-size: .9rem;
  color: var(--muted);
}

/* Checkbox */
.checkbox {
  width: 1rem;
  height: 1rem;
  border: 1px solid var(--border-color);
  border-radius: .25rem;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
}
.table th, .table td {
  border: 1px solid var(--border-color);
  padding: .5rem;
}
.table th {
  background: #f3f4f6;
  font-weight: 600;
}

/* Compact table variant */
.table-compact th, .table-compact td {
  padding: .4rem .5rem;
}

/* Progress Steps */
.steps {
  display: flex;
  gap: .5rem;
}
.step {
  padding: .25rem .75rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: .85rem;
  color: #374151;
  background: #fff;
}
.step.active {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

/* Sticky Action Bar (Mobile) */
.sticky-action-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: #fff;
  border-top: 1px solid var(--border-color);
  padding: .75rem;
  box-shadow: 0 -6px 16px rgba(0,0,0,0.06);
}

/* Accent strip */
.accent-strip {
  height: 6px;
  background: var(--accent-color);
  border-top-left-radius: 1rem;
  border-top-right-radius: 1rem;
}

/* Invoice Paper (A4) */
.invoice-paper {
  width: 210mm;
  min-height: 297mm;
  margin: 0 auto;
  border: 1px solid var(--border-color);
  background: #fff;
  color: #111827;
  position: relative;
}

/* Paid stamp */
.paid-stamp {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-20deg);
  font-size: 2rem;
  font-weight: 700;
  color: var(--success);
  opacity: 0.2;
  pointer-events: none;
  animation: stamp .6s ease forwards;
}
@keyframes stamp {
  0% { transform: translate(-50%, -50%) scale(0.5) rotate(-20deg); opacity: 0; }
  100% { transform: translate(-50%, -50%) scale(1) rotate(-20deg); opacity: 0.2; }
}

/* Totals block */
.totals p {
  margin: .25rem 0;
}
.totals hr {
  border: none;
  border-top: 1px solid var(--border-color);
}

/* Theme dots */
.theme-dot {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 2px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
}

/* Micro animations */
.btn-primary, .btn-secondary, .btn-outline {
  transform: translateZ(0);
}
.btn-primary:hover, .btn-secondary:hover, .btn-outline:hover {
  transform: translateY(-1px);
}

/* Skeleton loader */
.skeleton {
  position: relative;
  overflow: hidden;
  background: #e5e7eb;
}
.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,.6) 50%, rgba(255,255,255,0) 100%);
  transform: translateX(-100%);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Footer watermark */
.watermark {
  font-size: .75rem;
  color: #9ca3af;
  text-align: right;
}

/* Dark mode */
[data-theme="dark"] {
  --text-color: #f9fafb;
  --bg-color: #0b1220;
  --card-bg: #111827;
  --border-color: #1f2937;
  --muted: #9ca3af;
  background: var(--bg-color);
  color: var(--text-color);
}

[data-theme="dark"] header {
  background: rgba(17,24,39,0.8);
  border-bottom-color: var(--border-color);
}

[data-theme="dark"] .card {
  background: var(--card-bg);
  color: var(--text-color);
}

[data-theme="dark"] .btn-outline {
  border-color: var(--border-color);
  color: var(--text-color);
  background: transparent;
}
[data-theme="dark"] .btn-outline:hover {
  background: #1f2937;
}

[data-theme="dark"] .table th {
  background: #1f2937;
  color: var(--text-color);
}
[data-theme="dark"] .table td {
  border-color: var(--border-color);
}

[data-theme="dark"] .invoice-paper {
  background: #ffffff; /* white paper on dark UI */
  color: #111827;
  border-color: #e5e7eb;
}

/* Print styles */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }
  header, footer, nav, .sticky-action-bar {
    display: none !important;
  }
  .card, .section, .btn-primary, .btn-secondary, .btn-outline {
    box-shadow: none !important;
  }
  .invoice-paper {
    border: none !important;
    box-shadow: none !important;
    margin: 0 !important;
    width: 100% !important;
    min-height: auto !important;
  }
  .accent-strip {
    background: #000 !important;
  }
  .watermark {
    font-size: 10px !important;
    color: #999 !important;
    text-align: right !important;
  }
}

/* Accessibility helpers */
input:focus, textarea:focus, select:focus, button:focus {
  outline: 2px solid rgba(79,70,229,0.4);
  outline-offset: 2px;
}

/* Header nav links */
header nav a {
  font-size: .9rem;
  color: #374151;
}
header nav a:hover {
  color: var(--accent-color);
}

/* Language & theme toggles */
#langToggle, #themeToggle {
  border: 1px solid var(--border-color);
  border-radius: .5rem;
  padding: .25rem .75rem;
  font-size: .9rem;
  color: #374151;
  background: #fff;
  transition: background .2s ease;
}
#langToggle:hover, #themeToggle:hover {
  background: #f3f4f6;
}

/* Hero typography */
h1 {
  font-size: clamp(1.75rem, 2.5vw, 2.25rem);
  font-weight: 700;
}
h2 {
  font-size: 1.5rem;
  font-weight: 600;
}
h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

/* Invoice preview header */
#invoicePaper .p-6, #quotationPaper .p-6 {
  padding: 1.5rem;
}
#invoicePaper .text-right, #quotationPaper .text-right {
  text-align: right;
}

/* Icon sizing helpers */
.icon-lg { font-size: 1.25rem; }
.icon-xl { font-size: 1.5rem; }

/* Grid helpers (fallback if Tailwind not present) */
.grid { display: grid; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.text-right { text-align: right; }
.rounded { border-radius: .5rem; }
.rounded-xl { border-radius: 1rem; }
.border { border: 1px solid var(--border-color); }
.border-t { border-top: 1px solid var(--border-color); }
.bg-white { background: #fff; }
.bg-gray-50 { background: #f9fafb; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-900 { color: #111827; }

/* Responsive helpers */
@media (min-width: 640px) {
  .sm\\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\\:col-span-2 { grid-column: span 2 / span 2; }
}
@media (min-width: 1024px) {
  .lg\\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}