/* =========================
   RESET & BASE
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-main: #0b0f14;
  --bg-card: #121826;
  --bg-input: #0e1424;
  --bg-output: #0f1629;

  --border-default: #2a2f45;
  --border-dashed: #2f3553;

  --text-main: #ffffff;
  --text-muted: #9aa4bf;
  --text-label: #aab3cf;

  --primary: #4f7cff;
  --primary-hover: #3c68e8;

  --secondary: #2a2f45;
  --secondary-hover: #343b5c;

  --success: #2f8cff;
  --error: #ff5c5c;

  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 8px;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
  padding: 20px;
  min-height: 100vh;
}

/* =========================
   LAYOUT
========================= */
.container {
  max-width: 780px;
  margin: auto;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 22px;
  font-size: 14px;
}

/* =========================
   CARDS
========================= */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 18px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.03);
}

/* =========================
   LABELS & INPUTS
========================= */
.label {
  font-size: 13px;
  color: var(--text-label);
  margin-bottom: 6px;
  display: block;
}

.input {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-input);
  color: var(--text-main);
  outline: none;
  font-size: 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input::placeholder {
  color: #6f7899;
}

.input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px rgba(79, 124, 255, 0.4);
}

.input:valid {
  border-color: var(--success);
}

.input:invalid {
  border-color: var(--error);
}

/* =========================
   BUTTONS
========================= */
.btn {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  margin-top: 10px;
  transition: background 0.2s ease, transform 0.1s ease;
}

.btn:active {
  transform: scale(0.98);
}

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

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

.btn-secondary {
  background: var(--secondary);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--secondary-hover);
}

/* =========================
   SHORTENER BLOCKS
========================= */
.shortener-block {
  border: 1px dashed var(--border-dashed);
  border-radius: var(--radius-lg);
  padding: 12px;
  margin-top: 12px;
}

.shortener-block:not(:last-child) {
  margin-bottom: 12px;
}

/* =========================
   OUTPUT BOX
========================= */
.output {
  background: var(--bg-output);
  border-radius: var(--radius-md);
  padding: 12px;
  margin-top: 12px;
}

#finalLinkText {
  word-break: break-all;
  font-size: 14px;
  margin-bottom: 8px;
  color: #cfe0ff;
}

.copy-btn {
  background: var(--success);
  border: none;
  color: #fff;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
}

.copy-btn:hover {
  opacity: 0.9;
}

/* =========================
   UTILITIES
========================= */
.hidden {
  display: none !important;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 480px) {
  h1 {
    font-size: 22px;
  }

  .btn {
    width: 100%;
  }
}

/* =========================
   SHORTENER BLOCK HEADER
========================= */
.block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.block-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

/* =========================
   REMOVE BUTTON
========================= */
.remove-btn {
  background: transparent;
  border: none;
  color: #ff6b6b;
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 6px;
}

.remove-btn:hover {
  background: rgba(255, 107, 107, 0.15);
}

/* =========================
   DE-CONGEST BLOCK INPUTS
========================= */
.shortener-block .label {
  margin-top: 12px;
}

.shortener-block .input {
  margin-top: 4px;
}