/* ═══════════════════════════════════════════════════════════════════
   MXEND — SIGN IN
   Premium Design System
   ═══════════════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────────────── */
:root {
  /* Surface */
  --surface-ground:       #0A0A0F;
  --surface-card:         #16161D;
  --surface-raised:       #1C1C26;
  --surface-overlay:      rgba(22, 22, 29, 0.85);
  --surface-input:        transparent;
  --surface-hover:        rgba(255, 255, 255, 0.04);
  --surface-active:       rgba(255, 255, 255, 0.06);

  /* Text */
  --text-primary:         #E8EAED;
  --text-secondary:       #9AA0A6;
  --text-disabled:        #5F6368;
  --text-on-accent:       #FFFFFF;

  /* Accent */
  --accent:               #8AB4F8;
  --accent-hover:         #AECBFA;
  --accent-container:     rgba(138, 180, 248, 0.08);
  --accent-container-hover: rgba(138, 180, 248, 0.14);

  /* States */
  --error:                #F28B82;
  --error-container:      rgba(242, 139, 130, 0.08);
  --success:              #81C995;
  --success-container:    rgba(129, 201, 149, 0.08);

  /* Border */
  --border:               #3C4043;
  --border-focus:         var(--accent);
  --border-error:         var(--error);

  /* Typography */
  --font-family:          'Google Sans', 'Segoe UI', Roboto, -apple-system, Helvetica, Arial, sans-serif;
  --font-family-text:     'Google Sans Text', 'Segoe UI', Roboto, -apple-system, Helvetica, Arial, sans-serif;

  --text-xs:              0.6875rem;   /* 11px */
  --text-sm:              0.75rem;     /* 12px */
  --text-base:            0.875rem;    /* 14px */
  --text-md:              1rem;        /* 16px */
  --text-lg:              1.5rem;      /* 24px */

  --weight-regular:       400;
  --weight-medium:        500;
  --weight-bold:          700;

  --leading-tight:        1.2;
  --leading-normal:       1.5;
  --leading-relaxed:      1.75;
  --tracking-normal:      0;
  --tracking-wide:        0.015em;
  --tracking-wider:       0.025em;

  /* Spacing */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* Radius */
  --radius-sm:     4px;
  --radius-md:     8px;
  --radius-lg:     12px;
  --radius-xl:     16px;
  --radius-2xl:    28px;
  --radius-full:   9999px;

  /* Shadow */
  --shadow-1:      0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-2:      0 2px 6px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.15);
  --shadow-3:      0 4px 16px rgba(0,0,0,0.35), 0 8px 32px rgba(0,0,0,0.2);
  --shadow-card:   0 1px 3px rgba(0,0,0,0.25),
                   0 4px 8px -2px rgba(0,0,0,0.15),
                   0 0 0 1px var(--border);

  /* Motion */
  --ease-standard:   cubic-bezier(0.2, 0, 0, 1);
  --ease-decelerate: cubic-bezier(0, 0, 0, 1);
  --ease-accelerate: cubic-bezier(0.3, 0, 1, 1);
  --duration-short:  150ms;
  --duration-medium: 250ms;
  --duration-long:   400ms;
}


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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-family-text);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--surface-ground);
  min-height: 100vh;
}


/* ── Layout ────────────────────────────────────────────────────── */
.signin-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--sp-6);
}


/* ── Card ──────────────────────────────────────────────────────── */
.signin-card {
  width: 100%;
  max-width: 448px;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--sp-12) var(--sp-10) var(--sp-10);
  animation: card-rise 0.5s var(--ease-decelerate) both;
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ── Header ────────────────────────────────────────────────────── */
.signin-header {
  text-align: center;
  margin-bottom: var(--sp-8);
}

.brand-mark {
  width: 48px;
  height: 48px;
  margin-bottom: var(--sp-5);
  object-fit: contain;
  user-select: none;
  border-radius: 0;
}

.signin-title {
  font-family: var(--font-family);
  font-size: var(--text-lg);
  font-weight: var(--weight-regular);
  color: var(--text-primary);
  letter-spacing: var(--tracking-normal);
  line-height: var(--leading-tight);
  margin-bottom: var(--sp-2);
}

.signin-subtitle {
  font-family: var(--font-family-text);
  font-size: var(--text-md);
  font-weight: var(--weight-regular);
  color: var(--text-secondary);
  letter-spacing: var(--tracking-wide);
}


/* ── Status Banner ─────────────────────────────────────────────── */
.status-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-6);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  animation: banner-in 0.3s var(--ease-decelerate) both;
}

.status-banner[hidden] { display: none; }

.status-banner--error {
  background: var(--error-container);
  color: var(--error);
}

.status-banner--success {
  background: var(--success-container);
  color: var(--success);
}

.status-banner__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding-top: 1px;
}

.status-icon { display: none; }
.status-banner--error .status-icon--error { display: block; }
.status-banner--success .status-icon--success { display: block; }

.status-banner__text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

@keyframes banner-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}


/* ── Form ──────────────────────────────────────────────────────── */
.signin-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}

@media (max-width: 480px) {
  .field-row {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }
}


/* ── Field (Material-style floating label) ─────────────────────── */
.field {
  display: flex;
  flex-direction: column;
}

.field__input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.field__input {
  width: 100%;
  height: 56px;
  padding: 22px 16px 6px;
  background: var(--surface-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-family-text);
  font-size: var(--text-md);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-wide);
  caret-color: var(--accent);
  outline: none;
  transition:
    border-color var(--duration-short) var(--ease-standard),
    box-shadow var(--duration-short) var(--ease-standard);
}

.field__input::placeholder {
  color: transparent;
}

/* Floating label */
.field__label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-family-text);
  font-size: var(--text-md);
  font-weight: var(--weight-regular);
  color: var(--text-disabled);
  pointer-events: none;
  transform-origin: left center;
  transition:
    transform var(--duration-medium) var(--ease-standard),
    font-size var(--duration-medium) var(--ease-standard),
    color var(--duration-medium) var(--ease-standard),
    top var(--duration-medium) var(--ease-standard);
}

/* Label float state */
.field__input:focus + .field__label,
.field__input:not(:placeholder-shown) + .field__label {
  top: 14px;
  transform: translateY(0);
  font-size: var(--text-xs);
  color: var(--accent);
}

.field__input:not(:focus):not(:placeholder-shown) + .field__label {
  color: var(--text-secondary);
}

/* Focus */
.field__input:focus {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

/* Error */
.field__input[aria-invalid="true"] {
  border-color: var(--error);
  box-shadow: inset 0 0 0 1px var(--error);
}

.field__input[aria-invalid="true"] + .field__label,
.field__input[aria-invalid="true"]:focus + .field__label {
  color: var(--error);
}

/* Password field with action button */
.field__input--has-action {
  padding-right: 52px;
}

/* Visibility toggle */
.field__action {
  position: absolute;
  right: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--duration-short) var(--ease-standard),
              color var(--duration-short) var(--ease-standard);
}

.field__action:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.field__action:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.icon { display: block; }


/* Field messages */
.field__error {
  font-size: var(--text-sm);
  color: var(--error);
  padding: var(--sp-1) var(--sp-4) 0;
  line-height: var(--leading-relaxed);
}

.field__error[hidden] { display: none; }

.field__hint {
  font-size: var(--text-xs);
  color: var(--text-disabled);
  padding: var(--sp-1) var(--sp-4) 0;
  line-height: var(--leading-relaxed);
}


/* ── Form Actions Row ──────────────────────────────────────────── */
.form-actions-row {
  display: flex;
  justify-content: flex-start;
  margin-top: calc(var(--sp-1) * -1);
}


/* ── Links ─────────────────────────────────────────────────────── */
.link {
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--accent);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  padding: var(--sp-1) var(--sp-2);
  margin: calc(var(--sp-1) * -1) calc(var(--sp-2) * -1);
  border-radius: var(--radius-sm);
  transition: background var(--duration-short) var(--ease-standard);
}

.link:hover {
  background: var(--accent-container);
  color: var(--accent-hover);
}

.link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}


/* ── Turnstile ─────────────────────────────────────────────────── */
.turnstile-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-4) 0;
}

.turnstile-container {
  display: flex;
  justify-content: center;
  min-height: 65px;
  align-items: center;
}

.turnstile-note {
  font-size: var(--text-xs);
  color: var(--text-disabled);
  text-align: center;
  letter-spacing: var(--tracking-wide);
  transition: color var(--duration-short) var(--ease-standard);
}

.turnstile-note--verified {
  color: var(--success);
}


/* ── Sign-in Actions ───────────────────────────────────────────── */
.signin-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-4);
}


/* ── Button ────────────────────────────────────────────────────── */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 40px;
  min-width: 90px;
  padding: 0 var(--sp-6);
  font-family: var(--font-family);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  line-height: 1;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    background var(--duration-short) var(--ease-standard),
    box-shadow var(--duration-short) var(--ease-standard),
    opacity var(--duration-short) var(--ease-standard);
  overflow: hidden;
}

.btn--filled {
  background: var(--accent);
  color: #202124;
}

.btn--filled:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: var(--shadow-1);
}

.btn--filled:active:not(:disabled) {
  box-shadow: none;
}

.btn--filled:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.btn--filled:disabled {
  background: var(--surface-raised);
  color: var(--text-disabled);
  cursor: default;
  box-shadow: none;
}

/* Ripple effect */
.btn--filled::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%), rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--duration-short) var(--ease-standard);
}

.btn--filled:active:not(:disabled)::after {
  opacity: 1;
}

.btn__label,
.btn__loading {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.btn__loading[hidden] { display: none; }

.btn--loading .btn__label { display: none; }
.btn--loading .btn__loading { display: inline-flex !important; }


/* ── Spinner ───────────────────────────────────────────────────── */
.spinner {
  animation: rotate 0.8s linear infinite;
}

.spinner path {
  stroke: #202124;
}

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


/* ── Footer ────────────────────────────────────────────────────── */
.page-footer {
  width: 100%;
  max-width: 448px;
  margin-top: var(--sp-8);
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer-locale {
  font-size: var(--text-sm);
  color: var(--text-disabled);
  letter-spacing: var(--tracking-wide);
}

.footer-nav {
  display: flex;
  gap: var(--sp-6);
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  padding: var(--sp-1) 0;
  transition: color var(--duration-short) var(--ease-standard);
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}


/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .signin-section {
    padding: var(--sp-4);
    padding-top: 8vh;
    justify-content: flex-start;
  }

  .signin-card {
    padding: var(--sp-8) var(--sp-6) var(--sp-6);
    border-radius: var(--radius-md);
  }

  .signin-title {
    font-size: var(--text-lg);
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
  }
}

@media (max-width: 360px) {
  .signin-card {
    padding: var(--sp-6) var(--sp-4) var(--sp-4);
  }
}


/* ── Reduced Motion ────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── High Contrast ─────────────────────────────────────────────── */
@media (forced-colors: active) {
  .field__input {
    border: 2px solid ButtonText;
  }

  .btn--filled {
    border: 2px solid ButtonText;
    forced-color-adjust: none;
  }

  .signin-card {
    border: 2px solid CanvasText;
  }
}