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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-2: #242836;
  --border: #2e3345;
  --text: #e8e6e1;
  --muted: #6b7280;
  --accent: #e0763e;
  --blue: #3b82f6;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 10px;
}

html {
  font-size: 10px;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 1.5rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  padding: 3rem 2rem;
  min-height: 100vh;
}

body.ready {
  background-color: var(--bg);
}

/* --- Header --- */

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 0.4rem;
}

#lang-toggle {
  background-color: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  cursor: pointer;
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.6rem 1.4rem;
  margin-top: 0.6rem;
  transition: color 0.15s, border-color 0.15s;
  flex-shrink: 0;
}

#lang-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}

h1 {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.4rem;
  color: var(--text);
}

h2 {
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-bottom: 2.4rem;
}

.version {
  color: var(--muted);
  font-size: 0.45em;
  font-weight: 400;
  letter-spacing: 0;
}

.form {
  width: 100%;
  max-width: 1100px;
}

.form label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.form label span {
  display: flex;
  flex-direction: column;
}

.label-hint {
  color: var(--muted);
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0;
  opacity: 0.7;
}

.underline {
  cursor: pointer;
  padding: 0.6rem 0;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
  color: var(--accent);
  text-transform: none;
  letter-spacing: 0;
  font-size: 1.3rem;
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  transition: color 0.15s;
}

.underline:hover {
  color: #fff;
}

input,
textarea {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--surface);
  color: var(--text);
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 1.5rem;
  padding: 1rem 1.2rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
}

input::placeholder,
textarea::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

button:disabled {
  background-color: var(--surface-2);
  color: var(--muted);
  cursor: not-allowed;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 1.2rem;
}

/* --- Input panel --- */

.data {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.correcter-wrap {
  width: 100%;
}

.correcter-row {
  display: flex;
  flex-direction: row !important;
  gap: 0.8rem;
  align-items: center;
}

.correcter-row input {
  flex: 1;
  font-size: 1.8rem;
  padding: 1.2rem 1.4rem;
}

#sign-toggle {
  background-color: var(--success);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  cursor: pointer;
  font-size: 2rem;
  font-weight: 700;
  min-width: 4.4rem;
  height: 4.4rem;
  line-height: 1;
  transition: background-color 0.15s, transform 0.1s;
}

#sign-toggle:hover {
  filter: brightness(1.1);
}

#sign-toggle:active {
  transform: scale(0.95);
}

#sign-toggle.negative {
  background-color: var(--danger);
}

#timecodes {
  margin-top: 0.4rem;
  min-height: 280px;
  resize: vertical;
}

/* --- Result panel --- */

.overflow {
  height: 100%;
  position: relative;
  overflow: hidden;
}

.result-wrapper {
  color: var(--text);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  height: 100%;
  padding: 2rem;
  position: relative;
  transition: margin-left 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-wrapper h2 {
  margin-bottom: 1.2rem;
}

#copy-button {
  background-color: var(--accent);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  cursor: pointer;
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.2rem;
  padding: 0.8rem 2.4rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s, filter 0.15s;
}

#copy-button:hover {
  filter: brightness(1.15);
}

.show-button {
  opacity: 1;
  pointer-events: auto;
}

#result {
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 1.4rem;
  line-height: 1.8;
  max-height: 55vh;
  padding: 1.6rem;
  position: relative;
  white-space: pre-wrap;
  transition: border-color 0.15s;
}

#result:hover {
  border-color: var(--accent);
}

#result:empty::before {
  content: var(--placeholder, 'result will be here');
  color: var(--muted);
  opacity: 0.5;
}

/* --- Status bar --- */

#is-corrected {
  font-size: 1.4rem;
  font-weight: 600;
  padding: 1rem 1.6rem;
  border-radius: var(--radius);
  min-height: 2rem;
  transition: color 0.15s;
}

/* --- Toast --- */

.copied-toast {
  position: absolute;
  bottom: calc(100% + 0.8rem);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  background-color: var(--success);
  color: #fff;
  font-family: inherit;
  font-size: 1.3rem;
  font-weight: 600;
  padding: 0.6rem 1.8rem;
  border-radius: 8px;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
}

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

/* --- Responsive --- */

@media (max-width: 700px) {
  body {
    padding: 2rem 1.2rem;
  }

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

  h1 {
    font-size: 2.2rem;
  }
}