/* SPDX-License-Identifier: AGPL-3.0-only */
/* Copyright (C) 2025-2026 DIY Accounting Ltd */

/* spreadsheets.css — Based on gateway.css for the spreadsheets product site */

/* ============================================================
   Design Tokens (CSS Custom Properties)
   ============================================================ */

:root {
  /* Brand — teal palette from diyaccounting.co.uk */
  --color-brand-primary: #2d9c9c;
  --color-brand-primary-dark: #247d7d;
  --color-brand-primary-light: #29c0c0;

  /* Text */
  --color-text-primary: #292a2a;
  --color-text-secondary: #555;
  --color-text-muted: #737373;
  --color-text-inverse: #fff;

  /* UI */
  --color-background: #f7fafa;
  --color-surface: #fff;
  --color-border: #d5dede;

  /* Focus (WCAG 2.1 AA) */
  --color-focus: #2d9c9c;
  --color-focus-ring: rgba(45, 156, 156, 0.3);

  /* Accent (product feature ticks) */
  --color-accent-green: #2e7d32;

  /* Typography */
  --font-family-base: Arial, sans-serif;
  --font-size-base: 1em;
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-normal: 1.5;

  /* Spacing */
  --spacing-sm: 0.5em;
  --spacing-md: 1em;
  --spacing-lg: 1.5em;
  --spacing-xl: 2em;

  /* Border Radius */
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 10px rgba(0, 0, 0, 0.1);

  /* Layout */
  --max-width-content: 800px;
}

/* ============================================================
   Utility
   ============================================================ */

.hidden {
  display: none;
}

/* ============================================================
   Reset
   ============================================================ */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ============================================================
   Skip Link (WCAG 2.1 AA: 2.4.1 Bypass Blocks)
   ============================================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: #fff;
  padding: 8px;
  z-index: 100;
  text-decoration: underline;
}
.skip-link:focus {
  top: 0;
}

/* ============================================================
   Top Navigation
   ============================================================ */

.top-nav {
  display: flex;
  justify-content: center;
  gap: 0.25em;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--color-text-primary);
  text-decoration: none;
  padding: 0.5em 1em;
  border-radius: var(--radius-md);
  font-size: 0.95em;
  transition: background-color 0.2s, color 0.2s;
}

.top-nav a:hover {
  background: var(--color-brand-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
}

.top-nav a.nav-current {
  border-bottom: 2px solid var(--color-brand-primary);
  color: var(--color-brand-primary);
  font-weight: var(--font-weight-semibold);
}

/* ============================================================
   Links (WCAG 2.1 AA: distinguishable by more than colour)
   ============================================================ */

p a,
li a,
address a,
.footer-content a {
  text-decoration: underline;
}

/* ============================================================
   Focus Styles (WCAG 2.1 AA: 2.4.7 Focus Visible)
   ============================================================ */

a:focus,
button:focus,
select:focus,
[tabindex]:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.btn-download:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

/* ============================================================
   Base
   ============================================================ */

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-background);
  background-image:
    linear-gradient(to right, #e8eded 1px, transparent 1px),
    linear-gradient(to bottom, #e8eded 1px, transparent 1px);
  background-size: 11px 11px;
  color: var(--color-text-primary);
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  max-width: var(--max-width-content);
  margin: 0 auto;
}

h1 {
  font-size: 2.2em;
  color: var(--color-brand-primary);
  margin-bottom: 0.2em;
  font-weight: var(--font-weight-bold);
  text-align: center;
}

h2 {
  font-size: 1.3em;
  color: var(--color-brand-primary);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

p {
  line-height: var(--line-height-normal);
  margin-bottom: var(--spacing-md);
}

main {
  flex: 1;
}

/* ============================================================
   Subtitle
   ============================================================ */

.subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.95em;
  margin-bottom: var(--spacing-lg);
}

/* ============================================================
   Intro Section
   ============================================================ */

.intro-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.intro-section p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   Product Grid Image (feature comparison)
   ============================================================ */

.product-grid-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.product-grid-section img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.product-grid-section img:hover {
  opacity: 0.9;
}

.product-grid-section .caption {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin: 0.75rem 0 0 0;
}

/* ============================================================
   Product Cards
   ============================================================ */

.product-cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg) var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.product-card h2 {
  margin-bottom: 0.5em;
  font-size: 1.1em;
}

.product-card h2 a {
  color: var(--color-brand-primary);
  text-decoration: none;
}

.product-card h2 a:hover {
  text-decoration: underline;
}

.product-card .product-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  font-size: 0.95em;
  line-height: 1.6;
}

.product-card .feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-md) 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25em 1em;
}

.product-card .feature-list li {
  padding: 0.2em 0;
  line-height: 1.6;
  font-size: 0.9em;
  color: var(--color-text-secondary);
}

.product-card .feature-list li::before {
  content: "\2713";
  color: var(--color-accent-green);
  font-weight: var(--font-weight-bold);
  margin-right: 0.5em;
}

/* ============================================================
   Product Screenshots (within cards)
   ============================================================ */

.product-screenshot {
  margin-top: 0.75rem;
}

.product-screenshot img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid #eee;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.product-screenshot img:hover {
  opacity: 0.9;
}

/* ============================================================
   Product Action (download button in card)
   ============================================================ */

.product-action {
  margin-top: var(--spacing-md);
  margin-bottom: 0;
}

/* ============================================================
   Download / Donate Buttons
   ============================================================ */

.btn-download {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border: 2px solid var(--color-brand-primary);
  color: var(--color-brand-primary);
  background: var(--color-surface);
  transition: background-color 0.2s, color 0.2s;
  cursor: pointer;
}

.btn-download:hover {
  background: #e6f5f5;
}

.btn-primary {
  background: var(--color-brand-primary);
  color: var(--color-text-inverse);
}

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-brand-primary);
}

/* ============================================================
   Gallery Section (screenshot gallery)
   ============================================================ */

.gallery-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.gallery-grid img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid #eee;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.gallery-grid img:hover {
  opacity: 0.9;
}

/* ============================================================
   Download Page
   ============================================================ */

.download-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
}

.download-form {
  margin: var(--spacing-lg) 0;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 0.4em;
  font-size: 0.95em;
}

.form-group select {
  width: 100%;
  padding: 0.6em 0.8em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family-base);
  font-size: 1em;
  color: var(--color-text-primary);
  background: var(--color-surface);
  appearance: auto;
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.license-notice {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid #eee;
}

.license-notice p {
  color: var(--color-text-muted);
  font-size: 0.85em;
  margin-bottom: 0;
}

/* ============================================================
   Donate Page
   ============================================================ */

.donate-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: center;
}

.donate-section p {
  text-align: left;
}

.paypal-container {
  margin: var(--spacing-xl) 0;
  display: flex;
  justify-content: center;
}

.donate-skip {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.donate-skip a {
  color: var(--color-text-muted);
  font-size: 0.9em;
}

/* ============================================================
   Lightbox Body State
   ============================================================ */

body.lightbox-open {
  overflow: hidden;
}

/* ============================================================
   Lightbox Modal
   ============================================================ */

.lightbox-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 9999;
  cursor: pointer;
  justify-content: center;
  align-items: center;
}

.lightbox-overlay.active {
  display: flex;
}

.lightbox-overlay img {
  max-width: 95%;
  max-height: 95%;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  color: white;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  z-index: 10000;
  line-height: 1;
}

.lightbox-close:hover {
  color: #ccc;
}

.lightbox-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

/* ============================================================
   Navigation (back links, breadcrumbs)
   ============================================================ */

.nav-back {
  margin-bottom: var(--spacing-lg);
}

.nav-back a {
  color: var(--color-brand-primary);
  font-size: 0.9em;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
  margin-top: var(--spacing-xl);
  font-size: 0.9em;
  color: var(--color-text-muted);
  padding-top: var(--spacing-md);
  border-top: 1px solid #eee;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  flex: 1;
  text-align: left;
}

.footer-center {
  flex: 2;
  text-align: center;
}

.footer-left a {
  color: var(--color-brand-primary);
  text-decoration: none;
  font-size: 0.85em;
  transition: color 0.3s;
  display: inline-block;
  min-height: 24px;
  padding: 4px 0;
  line-height: 1.2;
  margin-right: 0.75em;
}

.footer-left a:hover {
  color: var(--color-brand-primary-dark);
  text-decoration: underline;
}

/* ============================================================
   Knowledge Base Search
   ============================================================ */

.kb-search-container {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.kb-search-container input {
  width: 100%;
  padding: 0.75em 1em;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family-base);
  font-size: 1em;
  color: var(--color-text-primary);
  background: var(--color-surface);
  transition: border-color 0.2s;
}

.kb-search-container input:focus {
  border-color: var(--color-focus);
  outline: none;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.kb-search-row {
  display: flex;
  gap: 0.75em;
  align-items: stretch;
}

.kb-search-row input {
  flex: 1;
}

.kb-search-row select {
  min-width: 180px;
  padding: 0.75em 0.8em;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family-base);
  font-size: 0.95em;
  color: var(--color-text-primary);
  background: var(--color-surface);
  appearance: auto;
}

.search-hint {
  display: block;
  margin-top: 0.4em;
  font-size: 0.85em;
  color: var(--color-text-muted);
}

/* ============================================================
   Knowledge Base Article List (Accordion)
   ============================================================ */

.kb-list {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  margin-bottom: var(--spacing-xl);
}

.kb-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.kb-question {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.85em 1em;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-family-base);
  font-size: 0.95em;
  color: var(--color-text-primary);
  text-align: left;
  gap: 0.6em;
  transition: background-color 0.15s;
}

.kb-question:hover {
  background: #f5f7fa;
}

.kb-question:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: -3px;
}

.kb-category-badge {
  display: inline-block;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  font-size: 0.75em;
  font-weight: var(--font-weight-semibold);
  background: #e6f5f5;
  color: var(--color-brand-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.kb-question-text {
  flex: 1;
  font-weight: var(--font-weight-semibold);
}

.kb-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: none;
  stroke: var(--color-text-muted);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.2s;
}

.kb-question[aria-expanded="true"] .kb-chevron {
  transform: rotate(180deg);
}

.kb-answer {
  padding: 0 1.25em 1em;
  font-size: 0.92em;
  line-height: 1.7;
  color: var(--color-text-secondary);
  border-top: 1px solid #eee;
}

.kb-answer p {
  margin-bottom: 0.6em;
}

.kb-answer ol,
.kb-answer ul {
  margin: 0.5em 0;
  padding-left: 1.5em;
}

.kb-answer li {
  margin-bottom: 0.3em;
}

.kb-answer a {
  color: var(--color-brand-primary);
}

.no-results {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
}

.link-button {
  background: none;
  border: none;
  color: var(--color-brand-primary);
  text-decoration: underline;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
}

/* ============================================================
   Knowledge Base Page Header
   ============================================================ */

.kb-page-title {
  text-align: center;
  color: var(--color-brand-primary);
  margin-bottom: 0.75em;
}

.kb-page-description {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ============================================================
   Responsive (600px breakpoint)
   ============================================================ */

@media (max-width: 600px) {
  body {
    padding: 0.5em;
  }

  h1 {
    font-size: 1.8em;
  }

  .product-card {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .product-card .feature-list {
    flex-direction: column;
    gap: 0.15em;
  }

  .top-nav {
    gap: 0.15em;
  }

  .top-nav a {
    padding: 0.4em 0.75em;
    font-size: 0.85em;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .download-actions {
    align-items: stretch;
  }

  .download-actions .btn-download {
    text-align: center;
  }

  .footer-content {
    flex-direction: column;
    gap: 0.5em;
  }

  .footer-left,
  .footer-center {
    text-align: center;
  }

  .kb-search-row {
    flex-direction: column;
  }

  .kb-search-row select {
    min-width: auto;
  }

  .kb-category-badge {
    font-size: 0.65em;
  }
}