/* ── Fonts ────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500&family=JetBrains+Mono:wght@400;500&display=swap');

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

/* ── Base ─────────────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
  background-color: var(--surface-canvas);
  color: var(--color-ink-black);
  font-family: var(--font-primary);
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
  letter-spacing: var(--tracking-body-sm);
  font-weight: var(--font-weight-regular);
  -webkit-font-smoothing: antialiased;
}

body { overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
ul, ol { padding-left: 1.4em; }
li { margin-bottom: 6px; }
strong { font-weight: var(--font-weight-medium); }

/* ── Nav ──────────────────────────────────────────────────── */
.bmi-nav {
  background-color: var(--surface-canvas);
  border-bottom: 1px solid var(--color-ink-black);
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.bmi-nav-inner {
  max-width: var(--page-max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-24);
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  color: var(--color-ink-black);
  flex-shrink: 0;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-nav);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.logo-text {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-body-sm);
}

.bmi-nav-links {
  display: flex;
  gap: var(--spacing-24);
  flex: 1;
  justify-content: center;
}

.bmi-nav-link {
  font-size: var(--text-body-sm);
  letter-spacing: var(--tracking-body-sm);
  color: var(--color-ash-gray);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.bmi-nav-link:hover,
.bmi-nav-link.active {
  color: var(--color-ink-black);
  border-bottom-color: var(--color-ink-black);
}

.btn-back {
  flex-shrink: 0;
  font-size: var(--text-caption);
  letter-spacing: var(--tracking-caption);
  color: var(--color-ink-black);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-buttons);
  padding: 6px 14px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-back:hover {
  background-color: var(--color-ink-black);
  color: var(--color-paper-white);
}

/* ── Page Hero ────────────────────────────────────────────── */
.page-hero {
  background-color: var(--surface-fog-card);
  border-bottom: 1px solid var(--color-ink-black);
  padding: var(--spacing-96) var(--spacing-24);
}

.page-hero-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-24);
}

.meta-tag {
  display: inline-block;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.06em;
  color: var(--color-ink-black);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-buttons);
  padding: 4px 12px;
}

.page-hero-heading {
  font-size: var(--text-heading);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-12);
}

.page-hero-sub {
  font-size: var(--text-body-sm);
  letter-spacing: var(--tracking-body-sm);
  color: var(--color-ash-gray);
  max-width: 640px;
  line-height: var(--leading-body-sm);
}

/* ── Main Layout Container ────────────────────────────────── */
.calc-main {
  padding: var(--section-gap) 0;
  background-color: var(--surface-canvas);
}

.pdf-layout-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-24);
}

/* ── Tool Toggles Grid ────────────────────────────────────── */
.pdf-tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-24);
}

.pdf-tool-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-6);
  padding: var(--spacing-16) var(--spacing-12);
  background-color: var(--surface-canvas);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-cards);
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
  user-select: none;
}

.pdf-tool-card.active {
  background-color: var(--color-highlighter-yellow);
  font-weight: var(--font-weight-medium);
}

.pdf-tool-card:hover:not(.active) {
  background-color: var(--surface-fog-card);
}

.pdf-tool-icon {
  font-size: 26px;
}

.pdf-tool-label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink-black);
}

.pdf-tool-desc {
  font-size: 11px;
  color: var(--color-ash-gray);
  line-height: 1.3;
}

/* ── Panels ───────────────────────────────────────────────── */
.pdf-panel {
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-cards);
  padding: var(--spacing-36);
  background-color: var(--surface-canvas);
  margin-bottom: var(--spacing-24);
}

.pdf-panel-title {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-6);
}

.pdf-panel-desc {
  font-size: var(--text-caption);
  color: var(--color-ash-gray);
  margin-bottom: var(--spacing-24);
  line-height: var(--leading-caption);
}

/* ── Drag & Drop Zone ─────────────────────────────────────── */
.pdf-dropzone {
  border: 2px dashed var(--color-ash-gray);
  border-radius: var(--radius-cards);
  padding: var(--spacing-40) var(--spacing-24);
  text-align: center;
  cursor: pointer;
  background-color: var(--surface-fog-card);
  transition: all 0.2s ease;
}

.pdf-dropzone:hover, .pdf-dropzone.pdf-dz-active {
  border-color: var(--color-ink-black);
  background-color: rgba(26, 26, 26, 0.02);
}

.pdf-dz-text {
  font-size: var(--text-body-sm);
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-6);
}

.pdf-dz-text strong {
  text-decoration: underline;
}

.pdf-dz-sub {
  font-size: var(--text-caption);
  color: var(--color-ash-gray);
}

/* ── File Row items ───────────────────────────────────────── */
.pdf-file-list {
  margin-top: var(--spacing-16);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
}

.pdf-file-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  background-color: var(--surface-fog-card);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-inputs);
  padding: 10px var(--spacing-16);
}

.pdf-file-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.pdf-file-name {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink-black);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.pdf-file-size {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-ash-gray);
}

.pdf-file-remove {
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-caption);
  color: var(--color-ash-gray);
  padding: var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease;
}

.pdf-file-remove:hover {
  color: #c0392b;
}

/* ── Form Controls & Buttons ──────────────────────────────── */
.field-group {
  margin-top: var(--spacing-20);
}

.pdf-label {
  display: block;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.06em;
  color: var(--color-ink-black);
  text-transform: uppercase;
  margin-bottom: var(--spacing-6);
}

.pdf-input {
  width: 100%;
  height: 42px;
  background-color: var(--surface-fog-card);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-inputs);
  padding: 0 var(--spacing-12);
  font-family: var(--font-primary);
  font-size: var(--text-body-sm);
  color: var(--color-ink-black);
  outline: none;
  transition: background-color 0.15s ease;
}

.pdf-input:focus {
  background-color: var(--surface-canvas);
}

.pdf-btn-primary {
  height: 44px;
  padding: 0 var(--spacing-24);
  background-color: var(--color-highlighter-yellow);
  color: var(--color-ink-black);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-buttons);
  font-family: var(--font-primary);
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: opacity 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.pdf-btn-primary:hover:not(:disabled) {
  opacity: 0.85;
}

.pdf-btn-primary:disabled {
  opacity: 0.4;
  cursor: default;
}

.pdf-btn-ghost {
  height: 44px;
  padding: 0 var(--spacing-16);
  background-color: transparent;
  color: var(--color-ink-black);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-buttons);
  font-family: var(--font-primary);
  font-size: var(--text-caption);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.pdf-btn-ghost:hover {
  background-color: var(--color-ink-black);
  color: var(--color-paper-white);
}

.pdf-actions-row {
  margin-top: var(--spacing-20);
  display: flex;
  gap: var(--spacing-12);
  align-items: center;
  flex-wrap: wrap;
}

/* Rotation selectors */
.pdf-angle-row {
  display: flex;
  gap: var(--spacing-8);
  margin-top: var(--spacing-6);
}

.pdf-angle-btn {
  flex: 1;
  height: 40px;
  background-color: var(--surface-fog-card);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-buttons);
  font-family: var(--font-primary);
  font-size: var(--text-caption);
  font-weight: var(--font-weight-regular);
  cursor: pointer;
  transition: all 0.15s ease;
}

.pdf-angle-btn.active {
  background-color: var(--color-ink-black);
  color: var(--color-paper-white);
}

.pdf-angle-btn:hover:not(.active) {
  background-color: rgba(26, 26, 26, 0.05);
}

/* Status alerts */
.pdf-status-badge {
  margin-top: var(--spacing-16);
  padding: var(--spacing-12) var(--spacing-16);
  border-radius: var(--radius-inputs);
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
  font-weight: var(--font-weight-medium);
  border: 1px solid transparent;
}

.pdf-status-badge.processing {
  background-color: #fef3c7;
  border-color: #d97706;
  color: #92400e;
}

.pdf-status-badge.done {
  background-color: #d1fae5;
  border-color: #10b981;
  color: #065f46;
}

.pdf-status-badge.error {
  background-color: #fee2e2;
  border-color: #ef4444;
  color: #991b1b;
}

/* Compression Stats display */
.pdf-stats-row {
  margin-top: var(--spacing-16);
  display: flex;
  gap: var(--spacing-12);
  flex-wrap: wrap;
}

.pdf-stat-pill {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  background-color: var(--surface-fog-card);
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-inputs);
  padding: 8px var(--spacing-16);
  min-width: 100px;
}

.pdf-stat-label {
  font-size: 11px;
  color: var(--color-ash-gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pdf-stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-ink-black);
}

/* Security Trust Badges info strip */
.pdf-info-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-8);
  justify-content: center;
  margin-top: var(--spacing-24);
}

.pdf-info-badge {
  padding: 6px var(--spacing-16);
  border-radius: 9999px;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--color-ink-black);
  background-color: var(--surface-fog-card);
  color: var(--color-ink-black);
}

/* ── SEO Section ──────────────────────────────────────────── */
.pdf-seo {
  margin-top: var(--section-gap);
  border-top: 1px solid var(--color-ink-black);
  padding-top: var(--spacing-48);
  margin-bottom: var(--spacing-96);
  background-color: var(--surface-canvas);
}

.pdf-seo-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-24);
}

.pdf-seo h2 {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-16);
}

.pdf-seo h3 {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-ink-black);
  margin-top: var(--spacing-24);
  margin-bottom: var(--spacing-6);
}

.pdf-seo p {
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-16);
}

.pdf-seo code {
  font-family: var(--font-mono);
  background-color: var(--surface-fog-card);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-ink-black);
  font-size: 12px;
}

/* Footer styling */
.bmi-footer {
  background-color: var(--surface-canvas);
  border-top: 1px solid var(--color-ink-black);
  padding: var(--spacing-48) 0;
  text-align: center;
}

.bmi-footer-inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-24);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-16);
}

.footer-note {
  font-size: var(--text-caption);
  color: var(--color-ash-gray);
  max-width: 600px;
  line-height: var(--leading-caption);
}

.footer-copy {
  font-size: var(--text-caption);
  font-family: var(--font-mono);
  color: var(--color-ash-gray);
}

/* Checkbox Hack Toggle Styles */
.nav-toggle-cb {
  display: none !important;
}

.nav-toggle-btn {
  display: none;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-ink-black);
  border-radius: var(--radius-nav);
  color: var(--color-ink-black);
  z-index: 2001;
  transition: all 0.15s ease;
}

.nav-toggle-btn:hover {
  background-color: var(--surface-fog-card);
}

.nav-toggle-cb:checked ~ .nav-toggle-btn {
  background-color: var(--color-ink-black);
  color: var(--color-paper-white);
  border-color: var(--color-ink-black);
}

.nav-toggle-cb:checked ~ .nav-toggle-btn .menu-open-icon {
  display: none !important;
}

.nav-toggle-cb:checked ~ .nav-toggle-btn .menu-close-icon {
  display: block !important;
}

@media (max-width: 768px) {
  .nav-toggle-btn {
    display: flex;
    order: 3;
  }

  .bmi-nav {
    height: 64px !important;
  }

  .bmi-nav-inner {
    height: 100% !important;
    flex-direction: row !important;
    justify-content: space-between !important;
    align-items: center !important;
    padding: 0 var(--spacing-16) !important;
    gap: var(--spacing-12) !important;
    flex-wrap: nowrap !important;
  }

  .bmi-nav-links {
    position: fixed !important;
    top: 0 !important;
    right: -300px !important;
    width: 280px !important;
    height: 100vh !important;
    background-color: var(--surface-canvas) !important;
    border-left: 1px solid var(--color-ink-black) !important;
    flex-direction: column !important;
    justify-content: flex-start !important;
    align-items: stretch !important;
    padding: 80px 24px 24px 24px !important;
    gap: 8px !important;
    z-index: 2000 !important;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1) !important;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.08) !important;
    margin: 0 !important;
  }

  .nav-toggle-cb:checked ~ .bmi-nav-links {
    transform: translateX(-300px) !important;
  }

  .bmi-nav-link {
    font-size: 15px !important;
    padding: 12px 16px !important;
    border-bottom: none !important;
    border-left: 3px solid transparent !important;
    width: 100% !important;
    display: block !important;
    color: var(--color-ash-gray) !important;
    transition: all 0.15s ease;
    text-align: left !important;
    white-space: normal !important;
  }

  .bmi-nav-link:hover,
  .bmi-nav-link.active {
    border-left-color: var(--color-ink-black) !important;
    background-color: var(--surface-fog-card) !important;
    color: var(--color-ink-black) !important;
  }

  .btn-back {
    font-size: 11px !important;
    padding: 4px 10px !important;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .pdf-tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pdf-panel {
    padding: var(--spacing-24) var(--spacing-16);
  }
  .pdf-actions-row button {
    width: 100%;
  }
  .page-hero {
    padding: var(--spacing-48) var(--spacing-24);
  }
}