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

:root {
  --bg: #0a0a1a;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary: #6366f1;
  --primary-light: #818cf8;
  --accent: #ec4899;
  --accent-light: #f472b6;
  --success: #10b981;
  --error: #ef4444;
  --gradient: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
  --radius: 16px;
  --radius-sm: 10px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ── Background Orbs ─────────────────────────────────────────────── */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  animation: float 20s ease-in-out infinite;
}

.bg-orb--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #6366f1 0%, transparent 70%);
  top: -200px;
  left: -100px;
  animation-delay: 0s;
}

.bg-orb--2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #ec4899 0%, transparent 70%);
  bottom: -150px;
  right: -100px;
  animation-delay: -7s;
}

.bg-orb--3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
  top: 40%;
  left: 50%;
  animation-delay: -14s;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(30px, -30px) scale(1.05);
  }

  66% {
    transform: translate(-20px, 20px) scale(0.95);
  }
}

/* ── App Layout ──────────────────────────────────────────────────── */
.app {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

/* ── Header ──────────────────────────────────────────────────────── */
.header {
  text-align: center;
  margin-bottom: 40px;
  animation: fadeInDown 0.6s ease-out;
}

.header__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 10px;
}

.header__icon {
  width: 40px;
  height: 40px;
  animation: spin-slow 12s linear infinite;
}

@keyframes spin-slow {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
}

.header__accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header__subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
  margin-top: 4px;
}

/* ── Cards / Glass ───────────────────────────────────────────────── */
.card {
  background: var(--surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  animation: fadeInUp 0.5s ease-out both;
}

.card--input {
  animation-delay: 0.1s;
}

.card--output {
  animation-delay: 0.15s;
  margin-top: 24px;
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.card__label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.card__label svg {
  color: var(--primary-light);
}

.card__textarea {
  width: 100%;
  min-height: 130px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  line-height: 1.7;
  resize: vertical;
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.card__textarea::placeholder {
  color: var(--text-dim);
}

.card__textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.card__actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
}

.card__char-count {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

/* ── Card Header (output) ────────────────────────────────────────── */
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.card__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.card__title svg {
  color: var(--primary-light);
}

.card__header-actions {
  display: flex;
  gap: 8px;
}

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
}

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

.btn--accent {
  background: linear-gradient(135deg, #ec4899 0%, #f97316 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(236, 72, 153, 0.3);
}

.btn--accent:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(236, 72, 153, 0.45);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Loading state */
.btn--loading .btn__text {
  opacity: 0;
}

.btn--loading .btn__icon {
  opacity: 0;
}

.btn--loading .btn__spinner {
  display: block;
}

.btn--loading {
  pointer-events: none;
}

.btn__spinner {
  display: none;
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── Error ────────────────────────────────────────────────────────── */
.error-msg {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  margin-top: 16px;
  color: #fca5a5;
  font-size: 0.9rem;
  animation: shake 0.4s ease;
}

.error-msg[hidden] {
  display: none;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-6px);
  }

  75% {
    transform: translateX(6px);
  }
}

/* ── Markdown Body (output) ──────────────────────────────────────── */
.markdown-body {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.8;
  word-wrap: break-word;
}

.markdown-body h1 {
  font-size: 1.75rem;
  font-weight: 800;
  margin: 28px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.markdown-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--primary-light);
}

.markdown-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 20px 0 10px;
  color: var(--accent-light);
}

.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-size: 1rem;
  font-weight: 600;
  margin: 16px 0 8px;
}

.markdown-body p {
  margin: 12px 0;
}

.markdown-body a {
  color: var(--primary-light);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

.markdown-body a:hover {
  color: var(--accent-light);
}

.markdown-body strong {
  font-weight: 700;
  color: #f1f5f9;
}

.markdown-body em {
  color: var(--text-muted);
}

.markdown-body ul,
.markdown-body ol {
  margin: 12px 0;
  padding-left: 28px;
}

.markdown-body li {
  margin: 6px 0;
}

.markdown-body li::marker {
  color: var(--primary-light);
}

.markdown-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding: 12px 20px;
  background: rgba(236, 72, 153, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font-style: italic;
}

.markdown-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  padding: 2px 7px;
  border-radius: 5px;
}

.markdown-body pre {
  margin: 16px 0;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  position: relative;
}

.markdown-body pre code {
  display: block;
  padding: 18px 20px;
  background: none;
  color: #cbd5e1;
  font-size: 0.85rem;
  line-height: 1.7;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.markdown-body th {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.markdown-body td {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
}

.markdown-body tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.markdown-body hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 28px 0;
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 12px 0;
}

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
  text-align: center;
  margin-top: 48px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer strong {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Animations ──────────────────────────────────────────────────── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Toast ────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(16, 185, 129, 0.9);
  backdrop-filter: blur(12px);
  color: #fff;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 100;
  pointer-events: none;
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .app {
    padding: 24px 16px 40px;
  }

  .header h1 {
    font-size: 1.6rem;
  }

  .card {
    padding: 20px;
  }

  .card__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .card__header-actions {
    width: 100%;
  }

  .card__header-actions .btn {
    flex: 1;
    justify-content: center;
  }

  .card__actions {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }

  .card__char-count {
    text-align: center;
  }

  .btn--primary {
    justify-content: center;
  }
}