/* =============================================
   CodeToFun — Case Converter Tool Page
   Self-contained, mobile-first responsive CSS
   ============================================= */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  color: #1e293b;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* --- Utilities --- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* --- Buttons (header nav) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.938rem;
  border-radius: 0.5rem;
  padding: 0.625rem 1.5rem;
  transition: all 0.2s ease;
  text-decoration: none;
  border: none;
  cursor: pointer;
  line-height: 1.4;
}

a.btn-primary,
button.btn-primary,
.btn-primary {
  background: #2563eb;
  color: #fff;
}

a.btn-primary:hover,
button.btn-primary:hover,
.btn-primary:hover {
  background: #1d4ed8;
  color: #fff;
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* =====================
   HEADER
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  background: #2563eb;
  padding: 0.5rem;
  border-radius: 0.5rem;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: #0f172a;
}

.logo-tagline {
  font-size: 0.75rem;
  color: #64748b;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

.desktop-nav a:not(.btn) {
  color: #475569;
  font-weight: 500;
  font-size: 0.938rem;
  transition: color 0.2s;
}

.desktop-nav a:not(.btn):hover {
  color: #2563eb;
}

.desktop-nav .btn-primary,
.mobile-nav .btn-primary {
  background: #2563eb;
  color: #fff;
}

.desktop-nav .btn-primary:hover,
.mobile-nav .btn-primary:hover {
  background: #1d4ed8;
  color: #fff;
}

.mobile-menu-btn {
  display: flex;
  padding: 0.5rem;
  color: #475569;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  border-top: 1px solid #e2e8f0;
  background: #fff;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a:not(.btn) {
  color: #475569;
  font-weight: 500;
  font-size: 0.938rem;
  transition: color 0.2s;
}

.mobile-nav a:not(.btn):hover {
  color: #2563eb;
}

/* =====================
   FOOTER
   ===================== */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 3rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: #94a3b8;
  line-height: 1.6;
  margin: 1rem 0 1.5rem;
}

.footer-brand .logo-name {
  color: #fff;
}

.footer-brand .logo-tagline {
  color: #94a3b8;
}

.follow-heading {
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.social-links {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.social-links a {
  background: #1e293b;
  padding: 0.625rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-links a:hover {
  background: #334155;
}

.trusted-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #1e293b;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  border: 1px solid #334155;
}

.trusted-badge .dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #3b82f6;
}

.footer-links-col h4 {
  color: #fff;
  font-size: 0.938rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-links-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links-col a {
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-links-col a:hover {
  color: #60a5fa;
}

.footer-all-links ul {
  columns: 2;
  column-gap: 1.5rem;
}

.footer-all-links li {
  break-inside: avoid;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.875rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.heart-icon {
  vertical-align: middle;
}

.footer-legal-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
}

.footer-legal-links a {
  transition: color 0.2s;
}

.footer-legal-links a:hover {
  color: #60a5fa;
}

/* =====================
   COOKIE NOTICE
   ===================== */
.cookie-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #0f172a;
  color: #cbd5e1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  z-index: 200;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
}

.cookie-notice p {
  font-size: 0.813rem;
  text-align: center;
  line-height: 1.5;
}

.cookie-notice a:not(.btn) {
  color: #60a5fa;
  text-decoration: underline;
}

.cookie-notice .btn-primary {
  background: #2563eb;
  color: #fff;
}

.cookie-notice .btn-primary:hover {
  background: #1d4ed8;
  color: #fff;
}

/* =============================================
   TOOL PAGE — Case Converter
   ============================================= */

/* Page background */
.tool-page {
  background: linear-gradient(135deg, #eff6ff, #e0e7ff);
  min-height: 100vh;
}

/* --- Page Header --- */
.tool-page-header {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #dbeafe;
  color: #1d4ed8;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.tool-badge svg {
  width: 1rem;
  height: 1rem;
}

.tool-page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.tool-page-header p {
  font-size: 1rem;
  color: #475569;
  max-width: 40rem;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Main Tool Container --- */
.tool-container {
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  border: 1px solid #e2e8f0;
  overflow: hidden;
  margin-bottom: 2rem;
}

.tool-container.fullscreen {
  position: fixed;
  inset: 0;
  z-index: 50;
  border-radius: 0;
  margin: 0;
  overflow-y: auto;
}

/* --- Toolbar --- */
.tool-toolbar {
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
  padding: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-utils {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.813rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  color: #fff;
  white-space: nowrap;
}

.toolbar-btn svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.toolbar-btn.btn-copy { background: #2563eb; }
.toolbar-btn.btn-copy:hover { background: #1d4ed8; }
.toolbar-btn.btn-copy.copied { background: #16a34a; }

.toolbar-btn.btn-download { background: #16a34a; }
.toolbar-btn.btn-download:hover { background: #15803d; }

.toolbar-btn.btn-clear { background: #dc2626; }
.toolbar-btn.btn-clear:hover { background: #b91c1c; }

.toolbar-btn.btn-upload { background: #475569; }
.toolbar-btn.btn-upload:hover { background: #334155; }

.toolbar-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  background: #e2e8f0;
  color: #475569;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.toolbar-icon-btn:hover {
  background: #cbd5e1;
  color: #1e293b;
}

.toolbar-icon-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.toolbar-icon-btn:disabled:hover {
  background: #e2e8f0;
  color: #475569;
}

.toolbar-icon-btn svg {
  width: 1rem;
  height: 1rem;
}

.file-input-hidden {
  display: none;
}

/* --- Text Areas --- */
.text-areas {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: 1px solid #e2e8f0;
}

.text-area-panel {
  border-bottom: 1px solid #e2e8f0;
}

.text-area-panel:last-child {
  border-bottom: none;
}

.text-area-label {
  background: #f1f5f9;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e2e8f0;
}

.text-area-label h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: #0f172a;
}

.text-area-panel textarea {
  width: 100%;
  min-height: 12rem;
  padding: 1rem;
  border: none;
  resize: vertical;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  color: #1e293b;
  background: #fff;
  outline: none;
}

.text-area-panel textarea::placeholder {
  color: #94a3b8;
}

.text-area-panel.output textarea {
  background: #f8fafc;
}

/* --- Statistics Bar --- */
.stats-bar-tool {
  background: #f8fafc;
  padding: 1rem;
  border-bottom: 1px solid #e2e8f0;
}

.stats-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.stats-heading svg {
  width: 1rem;
  height: 1rem;
  color: #475569;
}

.stats-heading h4 {
  font-size: 0.813rem;
  font-weight: 600;
  color: #0f172a;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.stat-box {
  background: #fff;
  border-radius: 0.5rem;
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
}

.stat-box .stat-label {
  font-size: 0.688rem;
  color: #475569;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.stat-box .stat-value {
  font-size: 1.125rem;
  font-weight: 700;
}

.stat-box.stat-chars .stat-value { color: #2563eb; }
.stat-box.stat-nospaces .stat-value { color: #16a34a; }
.stat-box.stat-words .stat-value { color: #9333ea; }
.stat-box.stat-sentences .stat-value { color: #ea580c; }
.stat-box.stat-lines .stat-value { color: #ec4899; }
.stat-box.stat-paragraphs .stat-value { color: #4f46e5; }

/* --- Case Conversion Buttons --- */
.case-options {
  padding: 1.5rem 1rem;
}

.case-options-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.case-options-heading svg {
  width: 1.25rem;
  height: 1.25rem;
  color: #0f172a;
}

.case-options-heading h3 {
  font-weight: 700;
  color: #0f172a;
  font-size: 1rem;
}

.case-buttons-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.case-btn {
  position: relative;
  background: #fff;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  font-family: inherit;
  display: block;
  width: 100%;
}

.case-btn:hover {
  border-color: #93c5fd;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.case-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.case-btn:disabled:hover {
  border-color: #e2e8f0;
  box-shadow: none;
}

.case-btn-inner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.case-btn-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}

.case-btn-icon svg {
  width: 1.125rem;
  height: 1.125rem;
}

.case-btn-icon.icon-blue { background: #3b82f6; }
.case-btn-icon.icon-green { background: #22c55e; }
.case-btn-icon.icon-red { background: #ef4444; }
.case-btn-icon.icon-purple { background: #a855f7; }
.case-btn-icon.icon-pink { background: #ec4899; }
.case-btn-icon.icon-indigo { background: #6366f1; }
.case-btn-icon.icon-orange { background: #f97316; }

.case-btn-label {
  font-weight: 600;
  color: #0f172a;
  font-size: 0.875rem;
  margin-bottom: 0.125rem;
}

.case-btn-example {
  font-size: 0.75rem;
  color: #64748b;
  font-family: "Courier New", Courier, monospace;
}

.case-btn-tooltip {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: #2563eb;
  color: #fff;
  font-size: 0.688rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  font-family: inherit;
}

.case-btn:hover .case-btn-tooltip {
  opacity: 1;
}

/* --- Features Section --- */
.tool-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.tool-feature-card {
  background: #fff;
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
}

.tool-feature-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.tool-feature-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.tool-feature-icon.feat-blue { background: #dbeafe; color: #2563eb; }
.tool-feature-icon.feat-green { background: #dcfce7; color: #16a34a; }
.tool-feature-icon.feat-purple { background: #f3e8ff; color: #9333ea; }

.tool-feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.5rem;
}

.tool-feature-card p {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.6;
}

/* --- How to Use Section --- */
.how-to-use {
  background: #fff;
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
  margin-bottom: 2rem;
}

.how-to-use h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 1.5rem;
}

.how-to-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.how-to-grid h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.quick-steps {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quick-steps li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: #334155;
  font-size: 0.938rem;
  line-height: 1.5;
}

.step-number {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  background: #2563eb;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.125rem;
}

.case-types-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.case-types-list li {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.5;
}

.case-types-list strong {
  color: #0f172a;
}

/* =============================================
   RESPONSIVE — Tablet (640px+)
   ============================================= */
@media (min-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }

  .cookie-notice {
    flex-direction: row;
    justify-content: center;
  }

  .tool-page-header h1 {
    font-size: 2.5rem;
  }

  .tool-toolbar {
    padding: 1rem 1.5rem;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .case-buttons-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-options {
    padding: 1.5rem;
  }

  .tool-features {
    grid-template-columns: repeat(3, 1fr);
  }

  .how-to-use {
    padding: 2.5rem;
  }

  .how-to-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* =============================================
   RESPONSIVE — Desktop (768px+)
   ============================================= */
@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }

  .desktop-nav {
    display: flex;
  }

  .mobile-menu-btn {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .tool-page-header {
    padding: 2.5rem 0 2rem;
  }

  .text-areas {
    grid-template-columns: 1fr 1fr;
  }

  .text-area-panel {
    border-bottom: none;
  }

  .text-area-panel:first-child {
    border-right: 1px solid #e2e8f0;
  }

  .text-area-panel textarea {
    min-height: 20rem;
  }
}

/* =============================================
   RESPONSIVE — Large Desktop (1024px+)
   ============================================= */
@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 2fr 1fr 1fr;
    gap: 2rem;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-all-links ul {
    columns: 3;
  }

  .tool-page-header h1 {
    font-size: 2.75rem;
  }

  .tool-page-header p {
    font-size: 1.125rem;
  }

  .stats-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .case-buttons-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .how-to-use h2 {
    font-size: 1.75rem;
  }
}