/* Tokens */
:root {
  --blue: #38b6ff;
  --lilac: #ab8bf9;

  --bg1: var(--blue);
  --bg2: var(--lilac);

  --ink: #1f1f1f;
  --ink-soft: #3b3b3b;
  --paper: #ffffff;

  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.1);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 0.18s;
  --dur: 0.35s;

  --h1: clamp(2rem, 1.2rem + 3vw, 3rem);
  --body: clamp(1rem, 0.95rem + 0.2vw, 1.05rem);
}

/* Dark theme */
[data-theme="dark"] {
  --bg1: #0b1736;
  --bg2: var(--lilac);
  --ink: #eaeaea;
  --ink-soft: #bdbdbd;
  --paper: #121215;
}

/* Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }

body {
  font-family: "Open Sans", system-ui, sans-serif;
  color: var(--ink);
  line-height: 1.55;
  font-size: var(--body);
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  background-size: 200% 200%;
  animation: bgShift 12s var(--ease) infinite alternate;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Header */
header {
  text-align: center;
  padding: 3rem 1.25rem 2rem;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}
header h1 {
  font-family: "Playfair Display", serif;
  font-size: var(--h1);
  font-weight: 700;
  letter-spacing: 0.5px;
}
.subtitle { opacity: 0.9; margin-top: 0.35rem; }

/* Main */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 1.25rem 2rem;
}

/* Controls */
.controls {
  width: 100%;
  max-width: 1100px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
}
.control { display: grid; gap: 0.35rem; }
.control label { font-size: 0.9rem; color: #fff; opacity: 0.95; }

.controls select,
.controls button,
.controls input[type="range"] {
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.08);
  padding: 0.6rem 0.9rem;
  background: rgba(255, 255, 255, 0.95);
  color: #1f1f1f;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease);
}
.controls select:hover,
.controls button:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
#theme-toggle {
  align-self: end;
  background: linear-gradient(135deg, var(--lilac), var(--blue));
  color: #fff;
  border: 0;
}

/* Range */
.control.range { align-items: end; }
#lines-value { color: #fff; font-weight: 700; text-align: right; }

/* Form */
.form-section {
  width: 100%;
  max-width: 720px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] .form-section { background: rgba(0, 0, 0, 0.25); }

form { display: flex; flex-direction: column; gap: 1rem; }

form input[type="text"] {
  padding: 0.95rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: rgba(255, 255, 255, 0.95);
  outline: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur-fast) var(--ease);
}
form input[type="text"]:focus-visible {
  border-color: var(--lilac);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--lilac) 28%, transparent);
  transform: translateY(-1px);
}

form input[type="submit"] {
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius-md);
  border: 0;
  background: linear-gradient(135deg, var(--lilac), var(--blue));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease);
}
form input[type="submit"]:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* Output */
.output-section { width: 100%; max-width: 720px; }
.poem-box { background: var(--paper); border-radius: var(--radius-md); padding: 1.5rem 2rem; box-shadow: var(--shadow-sm); border: 1px solid rgba(0,0,0,.05); }
.poem-text { line-height: 1.7; white-space: pre-line; color: var(--ink); }
.placeholder { color: var(--ink-soft); text-align: center; font-style: italic; }

/* Actions */
.actions { display: flex; gap: 0.6rem; margin-top: 0.9rem; flex-wrap: wrap; }

/* Buttons */
.copy-btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border: 0;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--lilac), var(--blue));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease);
}
.copy-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.copy-btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }

/* Footer */
footer { text-align: center; padding: 2rem 1rem 2.4rem; color: #fff; opacity: 0.96; font-size: 0.9rem; }
footer a { color: #fff; font-weight: 600; text-decoration: none; border-bottom: 1px dashed rgba(255, 255, 255, 0.55); }
footer a:hover { border-color: #fff; opacity: 0.9; }

/* Animations */
@keyframes bgShift { 0% { background-position: 0% 50%; } 100% { background-position: 100% 50%; } }

/* Responsive */
@media (max-width: 1100px) {
  .controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #theme-toggle { grid-column: span 2; }
}