/* ===================================================
   Base64.it — Main Stylesheet
   =================================================== */

/* ── Variables ── */
:root {
  --blue:        #2b7de9;
  --blue-dark:   #1a62c9;
  --blue-light:  #e8f1fd;

  --bg:          #f4f6f9;
  --surface:     #ffffff;
  --surface-alt: #f8fafc;
  --border:      #e2e6ed;
  --text:        #1a1a1a;
  --text-muted:  #6b7280;
  --text-light:  #9ca3af;
  --shadow:      0 2px 12px rgba(0,0,0,.08);
  --shadow-card: 0 4px 24px rgba(0,0,0,.10);
  --radius:      10px;
  --radius-sm:   6px;
  --transition:  .18s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #000000;
    --surface:     #0d0d0d;
    --surface-alt: #111111;
    --border:      #222222;
    --text:        #e8eaf0;
    --text-muted:  #9ca3af;
    --text-light:  #6b7280;
    --shadow:      0 2px 12px rgba(0,0,0,.6);
    --shadow-card: 0 4px 24px rgba(0,0,0,.7);
    --blue-light:  #0d1a2e;
  }
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ── Layout Wrappers ── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container--wide {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Centered Logo ── */
.site-logo-centered {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 28px 0 8px;
}

.site-logo-centered a {
  display: block;
  width: 100%;
}

.site-logo-centered img {
  width: 100%;
  height: auto;
}

/* ── Ad Slots ── */
.ad-slot {
  overflow: hidden;
}

.ad-slot--leaderboard {
  width: 100%;
  min-height: 90px;
  margin: 16px 0;
}

.ad-slot--sidebar {
  width: 160px;
  min-height: 600px;
  flex-shrink: 0;
  position: sticky;
  top: 20px;
  align-self: flex-start;
}

.ad-slot--above-footer {
  width: 100%;
  min-height: 90px;
  margin: 24px 0 0;
}

/* ── Page Body Layout ── */
.page-body {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 0 0 40px;
}

.page-main {
  flex: 1;
  min-width: 0;
}

/* ── Tool Section ── */
.tool-section {
  padding: 28px 0 12px;
}

.tool-section__title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
  letter-spacing: -.02em;
}

.tool-section__sub {
  font-size: .95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ── Tool Card ── */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 22px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tool-card__header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tool-card__icon {
  width: 36px;
  height: 36px;
  background: var(--blue-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--blue);
}

.tool-card__icon svg { width: 18px; height: 18px; }

.tool-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.tool-card__subtitle {
  font-size: .78rem;
  color: var(--text-muted);
}

/* ── Textarea ── */
.tool-textarea {
  width: 100%;
  min-height: 110px;
  max-height: 400px;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .88rem;
  line-height: 1.5;
  padding: 10px 12px;
  resize: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
  field-sizing: content;
}

.tool-textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(43,125,233,.18);
}

.tool-textarea::placeholder { color: var(--text-light); }

/* ── Button Row ── */
.tool-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  user-select: none;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--blue);
  color: #fff;
}

.btn--primary:hover { background: var(--blue-dark); box-shadow: 0 4px 12px rgba(43,125,233,.3); }

.btn--outline {
  background: transparent;
  color: var(--blue);
  border: 1.5px solid var(--blue);
}

.btn--outline:hover { background: var(--blue-light); }

.btn--copy {
  background: var(--surface-alt);
  color: var(--text-muted);
  border: 1.5px solid var(--border);
}

.btn--copy:hover { border-color: var(--blue); color: var(--blue); }

.btn--copy.copied {
  background: #16a34a;
  border-color: #16a34a;
  color: #fff;
}

.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

/* ── Output Box ── */
.output-label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 6px;
}

.output-box {
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .88rem;
  line-height: 1.55;
  padding: 10px 12px;
  color: var(--text);
  min-height: 68px;
  word-break: break-all;
  white-space: pre-wrap;
  position: relative;
}

.output-box--empty { color: var(--text-light); font-style: italic; font-family: inherit; }
.output-box--error { border-color: #ef4444; background: rgba(239,68,68,.06); color: #ef4444; }

.output-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.output-meta {
  font-size: .75rem;
  color: var(--text-light);
}

/* ── Content Sections ── */
.content-sections {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow);
}

.content-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--blue-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-card h2 .section-icon {
  width: 32px;
  height: 32px;
  background: var(--blue);
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.content-card h2 .section-icon svg { width: 16px; height: 16px; }

.content-card p {
  color: var(--text-muted);
  font-size: .94rem;
  margin-bottom: 12px;
  line-height: 1.7;
}

.content-card p:last-child { margin-bottom: 0; }

/* Use Cases Grid */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 6px;
}

.use-case-item {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.use-case-item__icon {
  width: 32px;
  height: 32px;
  background: var(--blue-light);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
  flex-shrink: 0;
}

.use-case-item__icon svg { width: 15px; height: 15px; }

.use-case-item__title {
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
}

.use-case-item__desc {
  font-size: .8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0; }

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child { border-bottom: none; }

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  padding: 15px 0;
  font-size: .94rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--blue); }

.faq-question .faq-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item.open .faq-question { color: var(--blue); }
.faq-item.open .faq-arrow { transform: rotate(180deg); }

.faq-answer {
  display: none;
  padding: 0 0 15px;
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.open .faq-answer { display: block; }

/* ── Footer ── */
.site-footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.footer-inner {
  padding: 28px 0 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  text-align: center;
}

.footer-copy {
  font-size: .8rem;
  color: var(--text-light);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .ad-slot--sidebar { display: none; }
}

@media (max-width: 760px) {
  .tool-grid { grid-template-columns: 1fr; }

  .use-cases-grid { grid-template-columns: 1fr; }

  .content-card { padding: 20px 16px; }

  .tool-section__title { font-size: 1.3rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 14px; }
  .container--wide { padding: 0 14px; }
  .tool-card { padding: 16px 14px; }
}