/* ═══════════════════════════════════════════════════════════════
   UTM Generator — Design System & Styles
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── Tokens ──────────────────────────────────────────────────── */
:root {
  --bg: #051425;
  --bg2: #13162b;
  --bg3: #1a1e38;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-h: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.7);

  --primary: #6366f1;
  --primary-h: #41e1f2;
  --primary-glow: rgba(99, 102, 241, 0.35);

  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  --text: #f1f5f9;
  --text-2: #94a3b8;
  --text-3: #64748b;

  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── Background FX ───────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 10% -10%, rgba(99, 102, 241, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 110%, rgba(6, 182, 212, 0.12) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ──────────────────────────────────────────────────── */
.page-wrap {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* ── Header ──────────────────────────────────────────────────── */
.header {
  text-align: center;
  margin-bottom: 48px;
}

.header-badge {
  display: flex;
  margin: 20px auto;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
  justify-content: center;
  width: 80%;
}

.header-badge a {
  text-decoration: none;
  color: var(--accent);
}

.header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  background: linear-gradient(135deg, #fff 20%, var(--primary-h) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.header p {
  color: var(--text-2);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(20px);
  transition: border-color var(--transition);
  margin-bottom: 20px;
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.13);
}

.card-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Form ────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 7px;
  letter-spacing: 0.03em;
}

label .required {
  color: var(--primary);
  margin-left: 2px;
}

label .hint {
  font-weight: 400;
  color: var(--text-3);
  font-size: 0.72rem;
  margin-left: 6px;
}

/* Input base */
input[type="text"],
input[type="url"],
select,
textarea {
  width: 100%;
  background: var(--bg2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.93rem;
  padding: 11px 14px;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

input[type="text"]:focus,
input[type="url"]:focus,
select:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg3);
}

input::placeholder {
  color: var(--text-3);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 16px;
  background-position: right 12px center;
  padding-right: 38px;
  cursor: pointer;
}

select option {
  background: #1a1e38;
}

/* Select + custom together */
.select-custom-wrap {
  display: flex;
  gap: 8px;
}

.select-custom-wrap select {
  flex: 1;
}

.select-custom-wrap input {
  flex: 1;
}

/* ── Auto-tag indicator ──────────────────────────────────────── */
.auto-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 50px;
  padding: 2px 10px;
  margin-top: 6px;
  transition: opacity var(--transition);
}

.auto-tag svg {
  width: 11px;
  height: 11px;
}

/* ── URL Validation Feedback ─────────────────────────────────── */
input[type="url"].input-valid {
  border-color: var(--success);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.15);
}

input[type="url"].input-invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.15);
  animation: shake 0.35s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

.url-feedback {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  font-weight: 500;
  border-radius: 50px;
  padding: 4px 12px;
  margin-top: 8px;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.url-feedback svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.url-feedback--valid {
  color: var(--success);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.url-feedback--invalid {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.url-feedback--utm {
  color: var(--primary-h);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  animation: utmPulse 0.6s ease-out;
}

@keyframes utmPulse {
  0% { transform: scale(0.92); opacity: 0; }
  50% { transform: scale(1.04); }
  100% { transform: scale(1); opacity: 1; }
}

.preview-error {
  color: var(--danger) !important;
  font-style: normal !important;
  font-weight: 500;
}

/* ── URL Shortener Section ───────────────────────────────────── */
.shortener-container {
  margin-top: 15px;
}

.shortener-box {
  padding: 14px;
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius);
  animation: fadeSlideIn 0.4s ease-out;
}

.shortener-result {
  display: flex;
  align-items: center;
  gap: 12px;
}

.shortener-result > svg {
  color: var(--accent);
  flex-shrink: 0;
}

.shortener-result-info {
  flex: 1;
  min-width: 0;
}

.shortener-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 2px;
}

.short-url-link {
  display: block;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.2s;
}

.short-url-link:hover {
  color: var(--primary-h);
  text-decoration: underline;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Accent Button ───────────────────────────────────────────── */
.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--primary));
  color: #fff;
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.3);
}

.btn-accent:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-h), var(--accent));
  box-shadow: 0 6px 24px rgba(6, 182, 212, 0.45);
  transform: translateY(-1px);
}

@media (max-width: 600px) {
  .shortener-result {
    flex-wrap: wrap;
    gap: 8px;
  }
  .shortener-result > .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ── Preview Box ─────────────────────────────────────────────── */
.preview-card {
  background: var(--bg2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  transition: border-color var(--transition);
}

.preview-card.has-url {
  border-color: rgba(99, 102, 241, 0.4);
}

.preview-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-bottom: 12px;
}

#url-preview {
  font-family: 'Courier New', monospace;
  font-size: 0.82rem;
  color: var(--text-2);
  word-break: break-all;
  line-height: 1.8;
  min-height: 44px;
}

#url-preview .url-base {
  color: var(--text);
}

#url-preview .url-sep {
  color: var(--text-3);
}

#url-preview .url-key {
  color: var(--accent);
}

#url-preview .url-val {
  color: var(--primary-h);
}

.preview-placeholder {
  color: var(--text-3);
  font-style: italic;
  font-size: 0.82rem;
}

/* ── UTM Tags breakdown ──────────────────────────────────────── */
.tags-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.utm-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  border-radius: 6px;
  padding: 4px 10px;
  font-family: 'Courier New', monospace;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.3s, transform 0.3s;
}

.utm-tag.visible {
  opacity: 1;
  transform: translateY(0);
}

.utm-tag span:first-child {
  color: var(--text-3);
  font-size: 0.65rem;
  text-transform: uppercase;
}

.utm-tag.source {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--primary-h);
}

.utm-tag.medium {
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent);
}

.utm-tag.campaign {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #10b981;
}

.utm-tag.content {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--warning);
}

.utm-tag.term {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #f87171;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.4);
  flex: 1;
  justify-content: center;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-h);
  box-shadow: 0 6px 30px rgba(99, 102, 241, 0.55);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--surface-h);
  border: 1px solid var(--border);
  color: var(--text-2);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
  transform: translateY(-1px);
}

.btn-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--success);
}

.btn-success:hover:not(:disabled) {
  background: rgba(16, 185, 129, 0.25);
  transform: translateY(-1px);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ── Toast ───────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
  animation: toastIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) both;
  max-width: 320px;
}

.toast.success {
  border-left: 3px solid var(--success);
}

.toast.error {
  border-left: 3px solid var(--danger);
}

.toast.info {
  border-left: 3px solid var(--primary);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(30px) scale(0.9);
  }

  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toastOut {
  to {
    opacity: 0;
    transform: translateX(40px) scale(0.8);
  }
}

/* ── History Table ───────────────────────────────────────────── */
.history-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-top: 4px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

thead th {
  background: var(--bg3);
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 10px 14px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--surface-h);
}

tbody td {
  padding: 10px 14px;
  color: var(--text-2);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

tbody td:first-child {
  color: var(--text-3);
  font-size: 0.72rem;
  min-width: 92px;
}

.table-url {
  font-family: 'Courier New', monospace;
  color: var(--primary-h) !important;
  cursor: pointer;
}

.table-url:hover {
  text-decoration: underline;
}

.empty-history {
  text-align: center;
  color: var(--text-3);
  padding: 32px 16px;
  font-size: 0.83rem;
}

/* Guide Table Overrides */
.guide-table tbody td {
  white-space: normal;
  max-width: none;
  overflow: visible;
  line-height: 1.6;
  vertical-align: top;
}

.guide-table tbody td:first-child {
  font-size: 0.82rem;
  color: var(--text-2);
  min-width: 130px;
}

.guide-table strong {
  color: var(--text-1);
}

.guide-table em {
  display: block;
  margin-top: 6px;
  color: var(--text-3);
  font-size: 0.75rem;
}

/* ── Spinner ─────────────────────────────────────────────────── */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

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

/* ── QR Code Section ── */
.qr-container {
  margin-top: 15px;
}

.qr-box {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

#qr-image {
  width: 120px;
  height: 120px;
  background: #fff;
  padding: 5px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.qr-info {
  flex: 1;
}

.qr-info span {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.qr-info p {
  font-size: 0.72rem;
  color: var(--text-2);
  line-height: 1.4;
  margin-bottom: 8px;
}

.qr-colors {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.qr-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
}

.qr-dot:hover {
  transform: scale(1.2);
}

.qr-dot.active {
  border-color: #fff;
  transform: scale(1.1);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.btn-sm {
  font-size: 0.7rem;
  padding: 6px 12px;
}

@media (max-width: 500px) {
  .qr-box {
    flex-direction: column;
    text-align: center;
  }

  .qr-info {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

/* ── Toggle Switch ───────────────────────────────────────────── */
.toggle-container {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  font-weight: 600;
}

.switch {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.1);
  transition: .3s;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  transition: .3s;
}

input:checked+.slider {
  background-color: var(--accent);
  border-color: var(--accent);
}

input:focus+.slider {
  box-shadow: 0 0 1px var(--accent);
}

input:checked+.slider:before {
  transform: translateX(14px);
}

.slider.round {
  border-radius: 20px;
}

.slider.round:before {
  border-radius: 50%;
}

/* ── Divider ─────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ── Sheets status ───────────────────────────────────────────── */
.sheets-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-3);
}

.dot.connected {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.dot.error {
  background: var(--danger);
  box-shadow: 0 0 6px var(--danger);
}

/* ── CTA Banner ──────────────────────────────────────────────── */
.cta-banner {
  background: linear-gradient(135deg, var(--bg2), var(--accent));
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  padding: 20px;
  position: relative;
  overflow: hidden;
  margin-top: 32px;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  backdrop-filter: blur(5px);
  color: #fff;
}

.cta-banner h2 {
  color: #fff;
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.85rem;
  margin-bottom: 24px;
  line-height: 1.6;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: var(--bg);
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.85rem;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  position: relative;
  z-index: 2;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 600px) {
  .page-wrap {
    padding: 24px 14px 60px;
  }

  .card {
    padding: 20px;
  }

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

  .btn-row {
    flex-direction: column;
  }

  .btn-primary {
    flex: unset;
    width: 100%;
  }

  #toast-container {
    left: 14px;
    right: 14px;
    bottom: 16px;
  }
}

/* ── Scrollbar ───────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-3);
}

.info {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 7px;
  letter-spacing: 0.03em;
}