:root {
  --bg: #f3f5f3;
  --surface: #ffffff;
  --surface-soft: #f8faf8;
  --ink: #2f3850;
  --muted: #8f99ac;
  --line: #e5e8ec;
  --green: #4fb34f;
  --green-deep: #3b983b;
  --green-soft: #eaf5ea;
  --danger: #c44c4c;
  --shadow: 0 16px 40px rgba(69, 85, 111, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(79, 179, 79, 0.08), transparent 28%),
    linear-gradient(180deg, #f7f9f7 0%, #f1f4f2 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.shell {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 16px 20px 40px;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 20;
}

.topbar__actions {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
}

.brand__mark {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--green);
  transform-origin: center;
  animation: brand-mark-breathe 2.8s ease-in-out infinite;
}

.brand__mark svg {
  width: 100%;
  height: 100%;
  stroke-width: 2.2;
}

.brand__text {
  animation: brand-text-breathe 2.8s ease-in-out infinite;
}

.lang-button {
  border: 0;
  background: transparent;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  padding: 8px 0;
  transition: color 160ms ease, transform 160ms ease;
}

.topbar__github {
  color: var(--green);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  transition: color 160ms ease, transform 160ms ease;
}

.topbar__github svg {
  width: 100%;
  height: 100%;
}

.topbar__github:hover,
.topbar__github:focus-visible {
  color: var(--green);
  transform: translateY(-1px);
}

.topbar__github:focus-visible {
  outline: none;
}

.lang-button:hover,
.lang-button:focus-visible {
  color: var(--green);
  transform: translateY(-1px);
}

.lang-button:focus-visible {
  outline: none;
}

.lang-button__icon,
.upload-card__icon,
.feature-card__icon,
.footer__github i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.lang-button__icon svg,
.upload-card__icon svg,
.feature-card__icon svg,
.footer__github svg {
  width: 100%;
  height: 100%;
}

.lang-button__icon {
  width: 18px;
  height: 18px;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 6px;
  display: grid;
  gap: 4px;
  min-width: 132px;
  z-index: 30;
}

.lang-option {
  border: 0;
  background: transparent;
  text-align: left;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--ink);
}

.lang-option:hover,
.lang-option.is-active {
  background: var(--green-soft);
  color: var(--green-deep);
}

@keyframes brand-mark-breathe {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.94;
  }

  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}

@keyframes brand-text-breathe {
  0%,
  100% {
    opacity: 0.9;
  }

  50% {
    opacity: 1;
  }
}

.hero {
  padding: 36px 0 28px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 6px 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.panel {
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(214, 220, 228, 0.85);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  overflow: hidden;
}

.tablist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}

.tab {
  border: 0;
  background: transparent;
  padding: 16px 20px 14px;
  font-weight: 600;
  color: var(--muted);
  position: relative;
}

.tab.is-active {
  color: var(--green);
}

.tab.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--green);
}

.panel__body {
  padding: 22px;
}

.segmented {
  display: inline-flex;
  gap: 10px;
  margin-bottom: 16px;
}

.chip {
  border: 0;
  background: #dcebdc;
  color: var(--green);
  padding: 7px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.93rem;
}

.chip.is-active {
  background: var(--green);
  color: white;
}

.composer {
  margin-bottom: 16px;
}

.field {
  display: grid;
  gap: 10px;
  color: var(--ink);
  font-size: 0.95rem;
}

.field--textarea textarea,
.field input,
.upload-card,
.viewer-text,
.viewer-image-shell,
.result-card {
  border: 1px solid var(--line);
  background: var(--surface-soft);
  border-radius: 20px;
}

textarea,
input[type="url"] {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  border-radius: 20px;
  color: var(--ink);
  padding: 18px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea::placeholder,
input::placeholder {
  color: #b1b8c5;
}

textarea:focus,
input:focus {
  border-color: rgba(79, 179, 79, 0.5);
  box-shadow: 0 0 0 3px rgba(79, 179, 79, 0.12);
}

.upload-card {
  width: 100%;
  min-height: 188px;
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
}

.upload-card__icon {
  width: 24px;
  height: 24px;
  color: var(--green);
}

.upload-card__title {
  font-weight: 700;
}

.upload-card__help {
  color: var(--muted);
  font-size: 0.92rem;
}

.image-preview {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}

.image-preview img,
.viewer-image-shell img {
  width: 100%;
  max-height: 380px;
  object-fit: contain;
  display: block;
  border-radius: 18px;
}

.image-preview__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.primary-button,
.secondary-button {
  border: 0;
  border-radius: 16px;
  padding: 16px 20px;
  width: 100%;
  font-weight: 700;
  transition: transform 0.15s ease, background 0.15s ease;
}

.primary-button {
  background: var(--green);
  color: #fff;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--green-deep);
}

.secondary-button {
  background: #edf2ed;
  color: var(--green-deep);
}

.primary-button:active,
.secondary-button:active {
  transform: translateY(1px);
}

#open-button {
  margin-top: 18px;
}

.hint,
.status {
  margin: 12px 2px 0;
  font-size: 0.95rem;
}

.hint {
  color: var(--muted);
}

.status {
  min-height: 1.4em;
  color: var(--muted);
}

.status.is-error {
  color: var(--danger);
}

.status.is-success {
  color: var(--green-deep);
}

.result-card {
  padding: 18px;
  margin-top: 18px;
}

.result-card__label {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.result-card__value {
  overflow-wrap: anywhere;
  word-break: break-word;
  font-weight: 600;
}

.result-card__actions {
  margin-top: 14px;
}

.viewer-card {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface-soft);
  padding: 18px;
}

.viewer-card__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.viewer-card__meta {
  display: grid;
  gap: 4px;
}

.viewer-card__meta span {
  color: var(--muted);
}

.countdown-chip {
  width: 48px;
  height: 48px;
  border-radius: 999px;
  background: var(--green-soft);
  display: grid;
  place-items: center;
  color: var(--green-deep);
  font-weight: 800;
  font-size: 1.2rem;
}

.viewer-text {
  padding: 18px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
}

.viewer-image-shell {
  padding: 10px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 30px;
}

.feature-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 10px 24px rgba(69, 85, 111, 0.04);
}

.feature-card__icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  display: inline-grid;
  place-items: center;
  margin-bottom: 14px;
  background: var(--green-soft);
  color: var(--green);
}

.feature-card__icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.15;
}

.feature-card h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 0.95rem;
}

.footer {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 0 20px 24px;
  color: var(--muted);
  font-size: 0.92rem;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 8px;
  text-align: left;
}

.footer__github {
  color: color-mix(in srgb, var(--ink) 62%, white);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color 160ms ease, transform 160ms ease;
}

.footer__github svg {
  width: 16px;
  height: 16px;
}

.footer__github:hover,
.footer__github:focus-visible {
  color: var(--green);
  transform: translateY(-1px);
}

.footer__github:focus-visible {
  outline: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 720px) {
  .shell {
    padding: 12px 14px 28px;
  }

  .hero {
    padding: 28px 0 22px;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .panel__body {
    padding: 18px 14px;
  }

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

  .viewer-card__head {
    align-items: flex-start;
  }

  .image-preview__meta {
    flex-direction: column;
  }
}