/* ===================================================================
   Arthur ID — Enterprise Authorization SPA
   Design system: one token set, one component set, one source of truth.
   No external assets, no remote fonts, no build step.
   =================================================================== */

/* --- Tokens ------------------------------------------------------- */

:root {
  color-scheme: light dark;

  /* Surface */
  --page:          #f0f2f5;
  --surface:       #ffffff;
  --surface-2:     #f7f8fa;
  --surface-hover: #eef1f5;

  /* Text */
  --text:          #1a1f2e;
  --muted:         #5a6478;
  --faint:         #8b94a3;

  /* Borders */
  --border:        #dde1e8;
  --border-strong: #c4cad6;
  --border-focus:  #a3c0f5;

  /* Accent */
  --accent:        #2b5cd6;
  --accent-strong: #1f4ab8;
  --accent-soft:   #eaf1ff;
  --accent-text:   #ffffff;

  /* Semantic */
  --danger:        #c0291f;
  --danger-text:   #8a1e17;
  --danger-bg:     #fdf2f1;
  --danger-border: #f0c5c0;

  --success:       #1a7a3a;
  --success-bg:    #edf9f0;
  --success-border:#c3e6cd;

  --status:        #1849a0;
  --status-bg:     #eef4ff;
  --status-border: #c5dcf7;

  --warn:          #8a5a00;
  --warn-bg:       #fff8e8;
  --warn-border:   #f0d678;

  /* Geometry */
  --radius:        0.625rem;
  --radius-sm:     0.375rem;
  --radius-lg:     0.875rem;
  --control-h:     2.75rem;
  --card-w:        27rem;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.5rem;
  --sp-6:  2rem;

  /* Shadows */
  --shadow-card:   0 1px 2px rgba(15,23,42,.06), 0 4px 16px rgba(15,23,42,.07);
  --shadow-focus: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);
  --shadow-pop:   0 4px 12px rgba(15,23,42,.10), 0 8px 32px rgba(15,23,42,.08);

  /* Typography */
  font: 15px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page:          #14161c;
    --surface:       #1e222b;
    --surface-2:     #252a35;
    --surface-hover: #2d333f;

    --text:          #eceff4;
    --muted:         #9aa4b5;
    --faint:         #7a8395;

    --border:        #353c4a;
    --border-strong: #4a5263;
    --border-focus:  #5b86c8;

    --accent:        #7da6f5;
    --accent-strong: #9bbef7;
    --accent-soft:   #1e2d44;
    --accent-text:   #121a2a;

    --danger:        #f0908a;
    --danger-text:   #f0aaa1;
    --danger-bg:     #2e1c1a;
    --danger-border: #6e3d39;

    --success:       #6dd592;
    --success-bg:    #15281e;
    --success-border:#2d5239;

    --status:        #9cc2f5;
    --status-bg:     #1a2638;
    --status-border: #2e4a6e;

    --warn:          #e0b850;
    --warn-bg:       #2a230f;
    --warn-border:   #5a4a1f;

    --shadow-card:   0 1px 2px rgba(0,0,0,.20), 0 4px 16px rgba(0,0,0,.25);
    --shadow-pop:    0 4px 12px rgba(0,0,0,.30), 0 8px 32px rgba(0,0,0,.25);
  }
}

/* --- Reset -------------------------------------------------------- */

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

[hidden] { display: none !important; }

/* --- Page shell --------------------------------------------------- */

body {
  min-height: 100svh;
  display: grid;
  justify-items: center;
  align-content: start;
  padding: clamp(1.5rem, 6vh, 3.5rem) 1rem 1.5rem;
  background: var(--page);
  color: var(--text);
}

main {
  width: min(var(--card-w), 100%);
  display: grid;
  gap: var(--sp-3);
}

/* --- Brand mark --------------------------------------------------- */

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding-bottom: var(--sp-2);
  color: var(--muted);
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: 0 0 auto;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* --- Card --------------------------------------------------------- */

.card {
  display: grid;
  gap: var(--sp-4);
  padding: clamp(1.25rem, 4vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* --- Headings ----------------------------------------------------- */

.card h1 {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--text);
}

.card h1 + p,
[data-auth-email] {
  font-size: 0.9rem;
  color: var(--muted);
}

/* --- Forms -------------------------------------------------------- */

form {
  display: grid;
  gap: var(--sp-4);
}

[data-step="session"],
[data-step="sessions"],
[data-step="magic-success"] {
  display: grid;
  gap: var(--sp-3);
}

/* --- Fields ------------------------------------------------------- */

label {
  display: grid;
  gap: var(--sp-1);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.005em;
}

input {
  width: 100%;
  min-height: var(--control-h);
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input::placeholder {
  color: var(--faint);
}

input:hover:not(:focus) {
  border-color: var(--border-focus);
}

input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
}

/* Autofill: keep our background, not the browser's yellow */
input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--text);
  -webkit-box-shadow: 0 0 0 1000px var(--surface) inset;
  caret-color: var(--text);
}

/* --- Buttons ------------------------------------------------------ */

button,
[data-provider="google"] a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--control-h);
  padding: 0.625rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, opacity 120ms ease;
  user-select: none;
}

/* Primary action */
[data-continue],
[data-auth-submit],
[data-session-continue],
[data-step="code"] button[type="submit"],
[data-step="sessions"] button:not([data-sessions-logout]) {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

[data-continue]:hover:not(:disabled),
[data-auth-submit]:hover:not(:disabled),
[data-session-continue]:hover:not(:disabled),
[data-step="code"] button[type="submit"]:hover:not(:disabled) {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

/* Secondary / outline (magic link) */
[data-magic-send] {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}

[data-magic-send]:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: var(--accent);
  color: var(--accent);
}

/* Danger / logout */
[data-session-logout],
[data-sessions-logout] {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
  font-weight: 500;
}

[data-session-logout]:hover:not(:disabled),
[data-sessions-logout]:hover:not(:disabled) {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

/* Disabled */
button:disabled {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

/* Focus ring (all interactive) */
button:focus-visible,
a:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* --- Google provider button --------------------------------------- */

[data-provider="google"] {
  display: grid;
  gap: var(--sp-3);
}

[data-provider="google"] a {
  gap: var(--sp-2);
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  border-color: var(--border-strong);
}

[data-provider="google"] a:hover {
  background: var(--surface-hover);
  border-color: var(--border-focus);
}

[data-provider="google"] svg {
  width: 1.1rem;
  height: 1.1rem;
  flex: 0 0 auto;
}

/* --- Dividers ----------------------------------------------------- */

[data-divider],
[data-google-divider] {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--faint);
  font-size: 0.8rem;
  font-weight: 500;
}

[data-divider]::before,
[data-divider]::after,
[data-google-divider]::before,
[data-google-divider]::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* --- Alerts / notifications --------------------------------------- */

.notification {
  display: grid;
  gap: var(--sp-1);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.45;
}

.notification.error {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
}

.notification.error strong {
  color: var(--danger-text);
  font-weight: 700;
  font-size: 0.92rem;
}

.notification.error ul {
  display: grid;
  gap: 0.125rem;
  padding-left: 1.1rem;
  color: var(--text);
  word-break: break-word;
}

.notification.info {
  background: var(--status-bg);
  border: 1px solid var(--status-border);
  color: var(--status);
  font-weight: 500;
}

/* --- Status line -------------------------------------------------- */

[data-status] {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
  text-align: center;
  min-height: 1.2em; /* prevent layout shift */
}

/* --- Back link ---------------------------------------------------- */

[data-back] {
  text-align: center;
}

[data-back] a {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
}

[data-back] a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* --- Session step ------------------------------------------------- */

[data-session-alt] {
  font-size: 0.85rem;
  text-align: center;
}

[data-session-alt] a {
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
}

[data-session-alt] a:hover {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* --- Sessions list ------------------------------------------------ */

[data-sessions-list] {
  display: grid;
  gap: var(--sp-2);
}

[data-sessions-list] p {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.4;
}

[data-sessions-list] p button {
  width: auto;
  min-height: 2rem;
  margin-left: auto;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  flex: 0 0 auto;
}

[data-sessions-list] p button:hover:not(:disabled) {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

/* --- Powered by (inside card) ------------------------------------- */

.powered-by {
  text-align: center;
  font-size: 0.75rem;
  color: var(--faint);
  padding-top: var(--sp-2);
  margin-top: var(--sp-1);
  border-top: 1px solid var(--border);
  opacity: 0.7;
}

.powered-by a {
  color: var(--faint);
  text-decoration: none;
  font-weight: 500;
}

.powered-by a:hover {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* --- Footer (outside card) --------------------------------------- */

footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--faint);
  padding-top: var(--sp-2);
  line-height: 1.7;
}

footer a {
  color: var(--faint);
  text-decoration: none;
}

footer a:hover {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* --- Links (general) ---------------------------------------------- */

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

/* --- Reduced motion ----------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* --- Account page ------------------------------------------------ */

.account-main {
  width: min(48rem, 100%);
  display: grid;
  gap: var(--sp-4);
}

.account-card {
  display: grid;
  gap: var(--sp-4);
  padding: clamp(1.25rem, 4vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.account-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

.account-header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
}

.account-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.account-session-count {
  font-size: 0.82rem;
  color: var(--faint);
  font-weight: 500;
}

.account-user {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.account-avatar {
  width: 3rem;
  height: 3rem;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
}

.account-avatar svg {
  width: 1.5rem;
  height: 1.5rem;
}

.account-user-info {
  display: grid;
  gap: 0.125rem;
}

.account-user-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.account-user-email {
  font-size: 0.88rem;
  color: var(--muted);
}

.account-sessions {
  display: grid;
  gap: var(--sp-2);
}

.account-session-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  transition: opacity 200ms ease;
}

.account-session-current {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.account-session-icon {
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
}

.account-session-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.account-session-current .account-session-icon {
  color: var(--accent);
}

.account-session-info {
  flex: 1 1 auto;
  min-width: 0;
}

.account-session-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.account-session-meta {
  font-size: 0.8rem;
  color: var(--faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.account-session-time {
  cursor: help;
}

.account-session-badge {
  flex: 0 0 auto;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 1rem;
  padding: 0.15rem 0.6rem;
}

.account-loading,
.account-empty {
  text-align: center;
  font-size: 0.88rem;
  color: var(--faint);
  padding: var(--sp-4);
}

/* Shared button styles for account page */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-h);
  padding: 0.625rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, opacity 120ms ease;
  user-select: none;
  width: auto;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

.btn--danger {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.btn--danger:hover:not(:disabled) {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

.btn--sm {
  min-height: 2rem;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
  flex: 0 0 auto;
}

.account-footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--faint);
  padding-top: var(--sp-2);
  line-height: 1.7;
}

.account-footer a {
  color: var(--faint);
  text-decoration: none;
}

.account-footer a:hover {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* --- Legal / privacy page ---------------------------------------- */

.legal {
  display: grid;
  gap: var(--sp-4);
}

.legal h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
}

.legal h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-top: var(--sp-2);
}

.legal p,
.legal li {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.legal ul,
.legal ol {
  display: grid;
  gap: var(--sp-1);
  padding-left: 1.3rem;
}

.legal ul li { list-style: disc; }
.legal ol li { list-style: decimal; }

.legal strong {
  color: var(--text);
  font-weight: 600;
}

.legal a {
  color: var(--accent);
}

.legal .legal-meta {
  font-size: 0.82rem;
  color: var(--faint);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--border);
}

.legal .legal-back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  margin-top: var(--sp-2);
}

.legal .legal-back:hover {
  color: var(--accent);
}

/* --- Narrow screens ----------------------------------------------- */

@media (max-width: 420px) {
  :root {
    --control-h: 2.9rem; /* slightly taller for touch */
  }
  body { padding: 1rem 0.75rem 1rem; }
  .card { padding: 1.25rem; border-radius: var(--radius); }
}