/* ===== Design Tokens ===== */
:root {
  --surface-page: #f4f4f2;
  --surface-panel: #ffffff;
  --surface-raised: #ededeb;
  --surface-strong: #171717;
  --surface-inverse: #262626;
  --border-soft: #dededb;
  --border-strong: #9f9f9a;
  --text-primary: #171717;
  --text-secondary: #555550;
  --text-muted: #76766f;
  --text-inverse: #f6f6f3;
  --state-soft: #e7e7e4;
  --state-error: #2f2f2b;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --transition: 180ms cubic-bezier(0.22, 1, 0.36, 1);
  --font-sans: "Geist", "Aptos", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

button {
  touch-action: manipulation;
}

svg {
  display: block;
}

::selection {
  background: var(--surface-strong);
  color: var(--text-inverse);
}

.skip-link {
  position: fixed;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 500;
  transform: translateY(-150%);
  background: var(--surface-strong);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: transform var(--transition);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ===== Shared Type ===== */
.eyebrow {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0;
}

.lede {
  color: var(--text-secondary);
  max-width: 34ch;
}

.section-heading {
  display: grid;
  gap: var(--space-1);
}

.section-heading h2 {
  font-size: clamp(1.2rem, 1.5vw, 1.45rem);
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.2;
  text-wrap: balance;
}

/* ===== Flat Icons ===== */
.flat-icon {
  display: inline-grid;
  flex: 0 0 auto;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--surface-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-panel);
  color: var(--surface-strong);
}

.flat-icon svg {
  width: 24px;
  height: 24px;
}

.flat-icon path,
.action-icon path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.flat-icon.large {
  width: 56px;
  height: 56px;
  margin-inline: auto;
}

/* ===== Login Page ===== */
.login-container {
  display: grid;
  min-height: 100dvh;
  place-items: center;
  padding: var(--space-6);
}

.login-card {
  width: min(100%, 440px);
  background: var(--surface-panel);
  border: 1px solid var(--surface-strong);
  border-radius: var(--radius-md);
  padding: clamp(1.5rem, 5vw, 2.5rem);
}

.brand-lockup {
  display: grid;
  gap: var(--space-2);
  align-items: start;
  margin-bottom: var(--space-8);
}

.brand-lockup h1,
.brand h1 {
  color: var(--text-primary);
  font-size: clamp(1.55rem, 4vw, 2.15rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.05;
  text-wrap: balance;
}

/* ===== Form Elements ===== */
.form-group {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.form-group label,
.search-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 550;
}

.form-group input,
.search-input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-panel);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  padding: 0.75rem 0.875rem;
  transition: border-color var(--transition), background-color var(--transition), color var(--transition);
}

.form-group input::placeholder,
.search-input::placeholder {
  color: var(--text-muted);
}

.form-group input:hover,
.search-input:hover {
  border-color: var(--surface-strong);
}

.form-group input:focus,
.search-input:focus,
.btn:focus-visible,
.btn-cancel:focus-visible,
.btn-icon:focus-visible {
  outline: 2px solid var(--surface-strong);
  outline-offset: 2px;
}

.readonly-input:disabled {
  background: var(--surface-raised);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 1;
}

/* ===== Buttons ===== */
.btn,
.btn-cancel,
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
}

.btn {
  min-height: 46px;
  gap: var(--space-2);
  border: 1px solid var(--surface-strong);
  padding: 0.75rem 1.1rem;
  font-weight: 650;
}

.btn-primary,
.btn-success {
  width: 100%;
  background: var(--surface-strong);
  color: var(--text-inverse);
}

.btn-secondary,
.btn-cancel {
  background: var(--surface-panel);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-fit {
  width: auto;
}

.btn:hover,
.btn-cancel:hover,
.btn-icon:hover {
  background: var(--surface-inverse);
  border-color: var(--surface-inverse);
  color: var(--text-inverse);
}

.btn:active,
.btn-cancel:active,
.btn-icon:active {
  transform: translateY(1px);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.64;
}

.btn-icon {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-soft);
  background: var(--surface-panel);
  color: var(--text-primary);
}

.action-icon {
  width: 18px;
  height: 18px;
}

/* ===== Alert / Toast ===== */
.alert {
  display: none;
  margin-bottom: var(--space-5);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  color: var(--text-primary);
  font-size: 0.92rem;
}

.alert.error,
.alert.success {
  background: var(--surface-raised);
}

.alert.show {
  display: block;
}

.toast-container {
  position: fixed;
  top: var(--space-5);
  right: var(--space-5);
  z-index: 400;
  display: grid;
  gap: var(--space-2);
  width: min(360px, calc(100vw - 2rem));
}

.toast {
  border: 1px solid var(--surface-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-panel);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-4);
  font-size: 0.92rem;
  font-weight: 550;
  animation: toastIn 180ms var(--transition), toastOut 180ms var(--transition) 2.8s forwards;
}

/* ===== Dashboard Layout ===== */
.dashboard-container {
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem);
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--surface-strong);
  padding-bottom: var(--space-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.user-info {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: 108px;
  background: var(--surface-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.stat-value {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2vw, 2rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  margin-top: var(--space-2);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.create-section,
.links-section {
  background: var(--surface-panel);
  border: 1px solid var(--surface-strong);
  border-radius: var(--radius-md);
}

.create-section {
  display: grid;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
  padding: var(--space-6);
}

.create-form {
  display: grid;
  grid-template-columns: minmax(210px, 0.85fr) minmax(280px, 1.45fr) auto;
  gap: var(--space-4);
  align-items: end;
}

.create-form .form-group {
  margin-bottom: 0;
}

.slug-input-wrapper {
  position: relative;
}

.slug-prefix {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  max-width: 46%;
  transform: translateY(-50%);
  overflow: hidden;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  pointer-events: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.slug-input-wrapper input {
  padding-left: min(12rem, 52%);
}

.links-section {
  overflow: hidden;
}

.links-header {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 340px);
  gap: var(--space-5);
  align-items: end;
  border-bottom: 1px solid var(--border-soft);
  padding: var(--space-6);
}

.search-field {
  display: grid;
  gap: var(--space-2);
}

.table-wrap {
  overflow-x: auto;
}

.links-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

.links-table th {
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0;
  padding: var(--space-3) var(--space-5);
  text-align: left;
}

.links-table td {
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-primary);
  font-size: 0.92rem;
  padding: var(--space-3) var(--space-5);
  vertical-align: middle;
}

.links-table tbody tr {
  transition: background-color var(--transition);
}

.links-table tbody tr:hover {
  background: var(--state-soft);
}

.slug-cell {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.slug-link {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.target-url {
  max-width: 340px;
  overflow: hidden;
  color: var(--text-secondary);
  font-size: 0.88rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.meta-cell {
  color: var(--text-muted);
  font-size: 0.86rem;
}

.click-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 32px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xs);
  background: var(--surface-panel);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  padding: var(--space-1) var(--space-2);
}

.click-badge .action-icon {
  width: 16px;
  height: 16px;
}

.actions-cell {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.empty-state {
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  padding: var(--space-10) var(--space-5);
  color: var(--text-secondary);
  text-align: center;
}

.empty-state[hidden] {
  display: none;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(23, 23, 23, 0.62);
  padding: var(--space-4);
}

.modal-overlay.show {
  display: flex;
  animation: fadeIn 160ms var(--transition);
}

.modal {
  width: min(100%, 500px);
  background: var(--surface-panel);
  border: 1px solid var(--surface-strong);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  animation: modalIn 180ms var(--transition);
}

.modal h3 {
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: 0;
}

.modal > h3 {
  margin-bottom: var(--space-5);
}

.modal-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.btn-cancel {
  min-height: 46px;
  padding: 0.75rem 1.1rem;
  font-weight: 650;
}

.qr-modal {
  max-width: 420px;
}

.qr-preview {
  display: grid;
  min-height: 292px;
  place-items: center;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  background: var(--surface-panel);
  padding: var(--space-5);
}

.qr-preview img {
  width: min(248px, 100%);
  height: auto;
  image-rendering: pixelated;
}

.qr-loading,
.qr-error {
  color: var(--text-secondary);
  font-size: 0.92rem;
  text-align: center;
}

.qr-url {
  margin-top: var(--space-3);
  overflow-wrap: anywhere;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.qr-actions {
  margin-top: var(--space-5);
}

/* ===== Motion ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes toastIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-6px); }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .create-form,
  .links-header,
  .stats-bar {
    grid-template-columns: 1fr;
  }

  .create-form .btn {
    width: 100%;
  }
}

@media (max-width: 680px) {
  .dashboard-container,
  .login-container {
    padding: var(--space-4);
  }

  .header {
    align-items: stretch;
    flex-direction: column;
  }

  .header-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .header-actions .btn {
    width: 100%;
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  .modal-actions .btn,
  .modal-actions .btn-cancel {
    width: 100%;
  }

  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    top: var(--space-4);
    width: auto;
  }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface-page);
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 0;
}