:root {
  --primary: #2e7d32;
  --primary-dark: #1b5e20;
  --primary-soft: #eaf7ed;
  --text: #18201b;
  --muted: #68716b;
  --bg: #f5f8f6;
  --card: #ffffff;
  --border: #e1e8e3;
  --danger: #c62828;
  --shadow: 0 14px 40px rgba(30, 60, 40, 0.08);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, #e9f8ed 0, transparent 35%),
    radial-gradient(circle at 90% 10%, #edf8f0 0, transparent 30%),
    var(--bg);
  line-height: 1.6;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.image-pdf-page {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 36px 0 70px;
}

/* HERO */

.tool-hero {
  max-width: 850px;
  margin: 0 auto 34px;
  text-align: center;
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid #ccebd3;
  border-radius: 999px;
  background: #effaf1;
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
}

.tool-hero h1 {
  margin: 14px 0 8px;
  font-size: clamp(34px, 6vw, 54px);
  line-height: 1.05;
  letter-spacing: -1.8px;
}

.tool-hero p {
  max-width: 760px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 16px;
}

.hero-points {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 17px;
}

.hero-points span {
  padding: 6px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: #69736d;
  font-size: 12px;
}

/* MAIN TOOL */

.tool-card {
  padding: 24px;
  border: 1px solid rgba(35, 70, 45, 0.08);
  border-radius: 22px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.step-heading,
.section-title {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.step-number {
  flex: 0 0 auto;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}

.step-heading h2,
.section-title h2 {
  margin: 0;
  font-size: 17px;
  line-height: 1.25;
}

.step-heading p,
.section-title p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
}

/* UPLOAD */

.upload-zone {
  min-height: 270px;
  margin-top: 20px;
  padding: 32px 20px;
  border: 2px dashed rgba(46, 125, 50, 0.34);
  border-radius: 18px;
  background: linear-gradient(135deg, #f8fcf9, #eff9f1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: 0.2s ease;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--primary);
  background: #eaf7ed;
  transform: translateY(-1px);
}

.upload-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  margin-bottom: 12px;
  border-radius: 15px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(30, 70, 40, 0.08);
  font-size: 28px;
}

.upload-zone h3 {
  margin: 0;
  font-size: 17px;
}

.upload-or {
  margin: 3px 0 9px;
  color: #87908a;
  font-size: 12px;
}

.supported-formats {
  margin: 9px 0 0;
  color: #7a847e;
  font-size: 10px;
}

/* BUTTONS */

.primary-btn,
.secondary-btn {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s ease;
}

.primary-btn {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 18px rgba(46, 125, 50, 0.18);
}

.primary-btn:hover {
  border-color: var(--primary-dark);
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.secondary-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
}

.secondary-btn:hover {
  border-color: #b8c7bc;
  background: #f7faf8;
}

.danger-btn {
  color: var(--danger);
}

.danger-btn:hover {
  border-color: #e6baba;
  background: #fff5f5;
}

/* IMAGE LIST */

.image-list-section,
.pdf-settings {
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.image-item {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: #fbfdfb;
}

.image-item-preview {
  aspect-ratio: 1 / 1;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(45deg, #f0f2f1 25%, transparent 25%),
    linear-gradient(-45deg, #f0f2f1 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f0f2f1 75%),
    linear-gradient(-45deg, transparent 75%, #f0f2f1 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

.image-item-preview img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 7px;
}

.image-item-info {
  padding: 9px;
  border-top: 1px solid var(--border);
}

.image-item-name {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 11px;
  font-weight: 700;
}

.image-item-size {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 10px;
}

.remove-image-btn {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 29px;
  height: 29px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  color: #a32626;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.remove-image-btn:hover {
  background: #fff0f0;
}

.image-order {
  position: absolute;
  top: 7px;
  left: 7px;
  min-width: 27px;
  height: 27px;
  padding: 0 6px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  font-weight: 800;
}

.image-list-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 15px;
}

/* SETTINGS */

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.setting-group {
  min-width: 0;
}

.setting-group label:not(.checkbox-row) {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
}

.setting-group select,
.setting-group input[type="text"] {
  width: 100%;
  min-height: 45px;
  padding: 9px 12px;
  border: 1px solid #d5dfd8;
  border-radius: 10px;
  outline: none;
  background: #fff;
  color: var(--text);
}

.setting-group select:focus,
.setting-group input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.setting-group input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
}

#qualityValue {
  color: var(--primary);
}

.full-width {
  grid-column: 1 / -1;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #4e5952;
  font-size: 13px;
  cursor: pointer;
}

.checkbox-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--primary);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 25px;
}

.generate-btn {
  flex: 1;
  min-width: 170px;
}

.action-row .secondary-btn {
  min-width: 120px;
}

/* RESULT */

.result-section {
  margin-top: 26px;
  padding: 30px 20px;
  border: 1px solid #cde8d2;
  border-radius: 17px;
  background: linear-gradient(135deg, #f0faf2, #f8fcf9);
  text-align: center;
}

.success-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 10px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 26px;
  font-weight: 800;
}

.result-section h2 {
  margin: 0;
  font-size: 21px;
}

.result-section p {
  margin: 5px auto 17px;
  color: var(--muted);
  font-size: 13px;
}

.download-btn {
  display: inline-flex;
}

/* HOW TO */

.how-to {
  margin-top: 45px;
}

.section-heading {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 9px;
  text-align: center;
}

.section-heading > span {
  font-size: 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: 22px;
}

.section-heading p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.info-card,
.feature-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.9);
  transition: 0.2s ease;
}

.info-card:hover,
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(30, 60, 40, 0.06);
}

.info-card > span {
  color: var(--primary);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
}

.info-card h3,
.feature-card h3 {
  margin: 7px 0 4px;
  font-size: 14px;
}

.info-card p,
.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
}

/* FEATURES */

.features-section {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.feature-card > span {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

/* DARK MODE */

html[data-theme="dark"] body {
  --text: #edf4ef;
  --muted: #aebbb2;
  --bg: #101512;
  --card: #18201b;
  --border: #303b34;

  background:
    radial-gradient(circle at 20% 0%, #172c1d 0, transparent 35%),
    radial-gradient(circle at 90% 10%, #18281d 0, transparent 30%),
    #101512;
}

html[data-theme="dark"] .tool-badge {
  background: #17331e;
  border-color: #285a31;
  color: #9fe0a7;
}

html[data-theme="dark"] .hero-points span {
  background: #18201b;
  border-color: #303b34;
  color: #aebbb2;
}

html[data-theme="dark"] .tool-card,
html[data-theme="dark"] .info-card,
html[data-theme="dark"] .feature-card,
html[data-theme="dark"] .image-item {
  background: #18201b;
  border-color: #303b34;
}

html[data-theme="dark"] .upload-zone {
  background: linear-gradient(135deg, #17231a, #142019);
  border-color: #397943;
}

html[data-theme="dark"] .upload-zone:hover,
html[data-theme="dark"] .upload-zone.drag-over {
  background: #19301e;
}

html[data-theme="dark"] .upload-icon {
  background: #202a23;
}

html[data-theme="dark"] .setting-group select,
html[data-theme="dark"] .setting-group input[type="text"],
html[data-theme="dark"] .secondary-btn {
  background: #1c251f;
  color: #edf4ef;
  border-color: #39463e;
}

html[data-theme="dark"] .checkbox-row {
  color: #c2cec6;
}

html[data-theme="dark"] .result-section {
  background: linear-gradient(135deg, #15291a, #18241b);
  border-color: #315c38;
}

html[data-theme="dark"] .image-item-preview {
  background-color: #202622;
  background-image:
    linear-gradient(45deg, #292f2b 25%, transparent 25%),
    linear-gradient(-45deg, #292f2b 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #292f2b 75%),
    linear-gradient(-45deg, transparent 75%, #292f2b 75%);
}

html[data-theme="dark"] .remove-image-btn {
  background: #202922;
  color: #ff9c9c;
}

/* SENIOR MODE */

html[data-theme="senior"] body {
  font-size: 18px;
  background: #f4f4f4;
}

html[data-theme="senior"] .image-pdf-page {
  max-width: 1200px;
}

html[data-theme="senior"] .tool-hero h1 {
  font-size: clamp(38px, 7vw, 58px);
  letter-spacing: -1px;
}

html[data-theme="senior"] .tool-hero p,
html[data-theme="senior"] .step-heading p,
html[data-theme="senior"] .section-title p,
html[data-theme="senior"] .section-heading p {
  font-size: 16px;
}

html[data-theme="senior"] .tool-card {
  border: 2px solid #222;
}

html[data-theme="senior"] .tool-badge,
html[data-theme="senior"] .hero-points span {
  border: 2px solid #222;
  background: #fff;
  color: #111;
  font-size: 15px;
}

html[data-theme="senior"] .upload-zone {
  border: 3px dashed #222;
  background: #fff;
}

html[data-theme="senior"] .upload-zone h3 {
  font-size: 22px;
}

html[data-theme="senior"] .supported-formats,
html[data-theme="senior"] .info-card p,
html[data-theme="senior"] .feature-card p {
  font-size: 14px;
}

html[data-theme="senior"] .primary-btn,
html[data-theme="senior"] .secondary-btn {
  min-height: 52px;
  padding: 11px 20px;
  font-size: 17px;
}

html[data-theme="senior"] .settings-grid {
  gap: 20px;
}

html[data-theme="senior"] .setting-group label:not(.checkbox-row),
html[data-theme="senior"] .checkbox-row {
  font-size: 17px;
}

html[data-theme="senior"] .setting-group select,
html[data-theme="senior"] .setting-group input[type="text"] {
  min-height: 52px;
  border: 2px solid #222;
  font-size: 17px;
}

html[data-theme="senior"] .image-item,
html[data-theme="senior"] .info-card,
html[data-theme="senior"] .feature-card {
  border: 2px solid #222;
  background: #fff;
}

html[data-theme="senior"] .result-section {
  border: 2px solid #222;
}

/* TABLET */

@media (max-width: 900px) {
  .image-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

/* MOBILE */

@media (max-width: 640px) {
  .image-pdf-page {
    width: min(100% - 20px, 1180px);
    padding-top: 25px;
    padding-bottom: 45px;
  }

  .tool-hero {
    margin-bottom: 24px;
  }

  .tool-hero h1 {
    font-size: 36px;
    letter-spacing: -1.2px;
  }

  .tool-hero p {
    font-size: 13px;
  }

  .hero-points {
    gap: 6px;
  }

  .hero-points span {
    padding: 5px 8px;
    font-size: 10px;
  }

  .tool-card {
    padding: 15px;
    border-radius: 17px;
  }

  .upload-zone {
    min-height: 235px;
    padding: 25px 12px;
  }

  .image-list-section,
  .pdf-settings {
    margin-top: 20px;
    padding-top: 20px;
  }

  .image-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    gap: 17px;
  }

  .full-width {
    grid-column: auto;
  }

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

  .features-section {
    grid-template-columns: 1fr;
  }

  .action-row {
    flex-direction: column;
  }

  .generate-btn,
  .action-row .secondary-btn {
    width: 100%;
  }

  .image-list-actions {
    flex-direction: column;
  }

  .image-list-actions .secondary-btn {
    width: 100%;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-heading h2 {
    font-size: 20px;
  }
}

/* SMALL PHONES */

@media (max-width: 380px) {
  .tool-hero h1 {
    font-size: 31px;
  }

  .tool-card {
    padding: 12px;
  }

  .upload-zone {
    min-height: 215px;
  }

  .upload-zone h3 {
    font-size: 15px;
  }

  .primary-btn,
  .secondary-btn {
    width: 100%;
  }

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