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

:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --card-soft: #f8fafc;

  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;

  --success: #16a34a;

  --shadow:
    0 20px 60px rgba(15, 23, 42, 0.08);

  --radius: 22px;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;

  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  background: var(--bg);
  color: var(--text);

  transition:
    background 0.3s ease,
    color 0.3s ease;
}


/* =========================
   HEADER
========================= */

.topbar {
  height: 76px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 0 6%;

  background: rgba(255, 255, 255, 0.88);

  border-bottom: 1px solid var(--border);

  backdrop-filter: blur(16px);

  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}

.brand-icon {
  width: 42px;
  height: 42px;

  display: grid;
  place-items: center;

  background: #eff6ff;

  border-radius: 12px;

  font-size: 21px;
}

.brand-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.4px;
}

.brand-subtitle {
  margin-top: 2px;

  color: var(--muted);

  font-size: 11px;
}

.theme-area {
  display: flex;
  align-items: center;
  gap: 9px;
}

.theme-label {
  color: var(--muted);
  font-size: 13px;
}

.theme-select {
  width: 125px;
  height: 40px;

  padding: 0 10px;

  border: 1px solid var(--border);
  border-radius: 11px;

  background: var(--card);
  color: var(--text);

  font-size: 13px;
  font-weight: 600;

  outline: none;
  cursor: pointer;
}


/* =========================
   MAIN
========================= */

.container {
  width: min(1080px, 92%);
  margin: auto;
}


/* =========================
   HERO
========================= */

.hero {
  text-align: center;

  padding: 70px 10px 42px;
}

.hero-badge {
  display: inline-flex;

  padding: 7px 13px;

  border-radius: 50px;

  background: #eff6ff;
  color: var(--primary);

  font-size: 12px;
  font-weight: 700;

  margin-bottom: 18px;
}

.hero h1 {
  max-width: 780px;
  margin: auto;

  font-size: clamp(38px, 6vw, 64px);

  line-height: 1.05;

  letter-spacing: -2.8px;

  font-weight: 850;
}

.hero h1 span {
  color: var(--primary);
}

.hero p {
  max-width: 650px;

  margin: 20px auto 0;

  color: var(--muted);

  font-size: 16px;

  line-height: 1.7;
}


/* =========================
   TOOL CARD
========================= */

.tool-card {
  background: var(--card);

  border: 1px solid var(--border);

  border-radius: 26px;

  padding: 28px;

  box-shadow: var(--shadow);
}


/* =========================
   UPLOAD
========================= */

.upload-box {
  min-height: 280px;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  text-align: center;

  padding: 35px;

  border: 2px dashed #cbd5e1;

  border-radius: 20px;

  background: var(--card-soft);

  cursor: pointer;

  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    background 0.25s ease,
    box-shadow 0.25s ease;
}

.upload-box:hover {
  transform: translateY(-3px);

  border-color: var(--primary);

  background: #f8fbff;

  box-shadow:
    0 15px 35px rgba(37, 99, 235, 0.08);
}

.upload-box.dragging {
  border-color: var(--primary);

  background: #eff6ff;

  transform: scale(1.01);
}

.upload-icon {
  width: 70px;
  height: 70px;

  display: grid;
  place-items: center;

  margin-bottom: 18px;

  border-radius: 20px;

  background: #eff6ff;

  color: var(--primary);

  font-size: 31px;

  transition: transform 0.25s ease;
}

.upload-box:hover .upload-icon {
  transform: translateY(-4px);
}

.upload-box h2 {
  font-size: 21px;
  margin-bottom: 8px;
}

.upload-box p {
  color: var(--muted);
  font-size: 14px;
}

.supported {
  margin-top: 13px;

  color: #9ca3af;

  font-size: 12px;
  font-weight: 700;
}

.supported span {
  margin: 0 4px;
}


/* =========================
   EDITOR
========================= */

.editor {
  margin-top: 26px;

  display: grid;

  grid-template-columns: 1.08fr 0.92fr;

  gap: 24px;
}


/* =========================
   COMMON CARD
========================= */

.preview-card,
.settings-card {
  border: 1px solid var(--border);

  border-radius: 19px;

  background: var(--card-soft);

  padding: 22px;
}

.section-heading {
  margin-bottom: 17px;
}

.section-heading h3 {
  font-size: 17px;
}

.section-heading p {
  color: var(--muted);

  font-size: 12px;

  margin-top: 4px;
}


/* =========================
   PREVIEW
========================= */

.preview-area {
  min-height: 420px;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 20px;

  border-radius: 15px;

  background:
    repeating-conic-gradient(
      #f1f5f9 0% 25%,
      #ffffff 0% 50%
    )
    50% / 22px 22px;

  overflow: hidden;
}

#preview {
  display: block;

  max-width: 100%;
  max-height: 390px;

  object-fit: contain;

  border-radius: 10px;

  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.15);
}

.image-info {
  margin-top: 14px;

  text-align: center;

  color: var(--muted);

  font-size: 12px;
}


/* =========================
   SETTINGS
========================= */

.settings-card {
  display: flex;
  flex-direction: column;

  gap: 13px;
}

.field {
  display: flex;
  flex-direction: column;

  gap: 7px;
}

.field label {
  font-size: 12px;
  font-weight: 750;
}

.field small {
  color: var(--muted);
  font-size: 11px;
}

input,
select {
  width: 100%;
  height: 45px;

  padding: 0 12px;

  border: 1px solid var(--border);

  border-radius: 10px;

  background: var(--card);

  color: var(--text);

  font-family: inherit;
  font-size: 14px;

  outline: none;

  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

input:focus,
select:focus {
  border-color: var(--primary);

  box-shadow:
    0 0 0 3px rgba(37, 99, 235, 0.10);
}


/* =========================
   DIMENSIONS
========================= */

.dimensions {
  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: 10px;
}

.input-unit {
  position: relative;
}

.input-unit input {
  padding-right: 40px;
}

.input-unit span {
  position: absolute;

  right: 12px;
  top: 50%;

  transform: translateY(-50%);

  color: var(--muted);

  font-size: 11px;
  font-weight: 700;
}


/* =========================
   RATIO
========================= */

.ratio-control {
  min-height: 38px;

  display: flex;
  align-items: center;

  gap: 9px;

  color: var(--muted);

  font-size: 12px;

  cursor: pointer;
}

.ratio-control input {
  display: none;
}

.custom-check {
  width: 19px;
  height: 19px;

  display: grid;
  place-items: center;

  border: 1px solid #cbd5e1;

  border-radius: 6px;

  background: var(--card);

  color: transparent;

  font-size: 12px;
  font-weight: 900;

  transition: 0.2s;
}

.ratio-control input:checked + .custom-check {
  background: var(--primary);

  border-color: var(--primary);

  color: white;
}


/* =========================
   SIZE
========================= */

.size-controls {
  display: grid;

  grid-template-columns: 1fr 90px;

  gap: 9px;
}


/* =========================
   BUTTONS
========================= */

.btn {
  width: 100%;
  height: 47px;

  display: flex;
  align-items: center;
  justify-content: center;

  gap: 8px;

  border: none;
  border-radius: 10px;

  font-family: inherit;

  font-size: 14px;
  font-weight: 750;

  cursor: pointer;

  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  margin-top: 5px;

  background: var(--primary);

  color: white;

  box-shadow:
    0 8px 20px rgba(37, 99, 235, 0.20);
}

.btn-primary:hover {
  background: var(--primary-hover);

  box-shadow:
    0 12px 25px rgba(37, 99, 235, 0.25);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-secondary {
  background: #eef2f7;
  color: #374151;
}


/* =========================
   RESULT
========================= */

.result {
  margin-top: 20px;

  display: flex;
  align-items: center;

  gap: 12px;

  padding: 15px 17px;

  border: 1px solid #bbf7d0;

  border-radius: 14px;

  background: #f0fdf4;
}

.result-icon {
  width: 34px;
  height: 34px;

  flex-shrink: 0;

  display: grid;
  place-items: center;

  border-radius: 50%;

  background: #dcfce7;
  color: #15803d;

  font-weight: 900;
}

.result strong {
  font-size: 13px;
}

.result p {
  margin-top: 3px;

  color: #166534;

  font-size: 12px;
}


/* =========================
   FEATURES
========================= */

.features {
  display: grid;

  grid-template-columns:
    repeat(4, 1fr);

  gap: 12px;

  margin-top: 18px;
}

.feature {
  display: flex;
  align-items: center;

  gap: 10px;

  padding: 15px;

  background: var(--card);

  border: 1px solid var(--border);

  border-radius: 14px;
}

.feature-icon {
  width: 35px;
  height: 35px;

  flex-shrink: 0;

  display: grid;
  place-items: center;

  border-radius: 10px;

  background: #eff6ff;

  font-size: 17px;
}

.feature strong {
  font-size: 12px;
}

.feature p {
  margin-top: 2px;

  color: var(--muted);

  font-size: 10px;
}


/* =========================
   FOOTER
========================= */

footer {
  text-align: center;

  padding: 35px 15px;

  color: var(--muted);

  font-size: 11px;
}

footer span {
  margin: 0 5px;
}


/* =========================
   HIDDEN
========================= */

.hidden {
  display: none !important;
}


/* =========================
   DARK MODE
========================= */

body.dark {
  --bg: #090d16;
  --card: #111827;
  --card-soft: #151e2d;

  --text: #f8fafc;
  --muted: #94a3b8;
  --border: #263244;

  --shadow:
    0 20px 60px rgba(0, 0, 0, 0.30);
}

body.dark .topbar {
  background: rgba(9, 13, 22, 0.88);
}

body.dark .brand-icon {
  background: #172554;
}

body.dark .hero-badge {
  background: #172554;
}

body.dark .upload-box {
  background: #111827;
  border-color: #334155;
}

body.dark .upload-box:hover {
  background: #172033;
}

body.dark .upload-box.dragging {
  background: #172554;
}

body.dark .upload-icon {
  background: #172554;
}

body.dark .preview-area {
  background:
    repeating-conic-gradient(
      #1e293b 0% 25%,
      #111827 0% 50%
    )
    50% / 22px 22px;
}

body.dark input,
body.dark select {
  background: #0f172a;
  border-color: #334155;
  color: #f8fafc;
}

body.dark .btn-secondary {
  background: #273449;
  color: #f8fafc;
}

body.dark .feature-icon {
  background: #172554;
}


/* =========================
   MOBILE
========================= */

@media (max-width: 800px) {

  .topbar {
    padding: 0 4%;
  }

  .theme-label {
    display: none;
  }

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

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


@media (max-width: 560px) {

  .topbar {
    height: 68px;
  }

  .brand-subtitle {
    display: none;
  }

  .brand-name {
    font-size: 16px;
  }

  .theme-select {
    width: 110px;
  }

  .hero {
    padding: 48px 8px 28px;
  }

  .hero h1 {
    font-size: 40px;
    letter-spacing: -1.8px;
  }

  .hero p {
    font-size: 14px;
  }

  .tool-card {
    padding: 15px;
    border-radius: 20px;
  }

  .upload-box {
    min-height: 230px;
    padding: 25px 15px;
  }

  .preview-area {
    min-height: 300px;
  }

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

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