frontend/src/pages/Auth/Login.css

/* ============================================================
   LOGIN PAGE — Two-column split layout
   Left: branding + knowledge network | Right: login form
   ============================================================ */

/* ── Outer wrapper ── */
.login-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow: hidden;
  position: relative;
}

/* ── Animated background layer ── */
.login-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.lg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}

.lg-orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, transparent 70%);
  top: -10%;
  right: -8%;
  animation: lgOrb1 18s ease-in-out infinite;
}

.lg-orb-2 {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.3) 0%, transparent 70%);
  bottom: -8%;
  left: -6%;
  animation: lgOrb2 22s ease-in-out infinite;
}

.lg-orb-3 {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.2) 0%, transparent 70%);
  top: 50%;
  left: 40%;
  animation: lgOrb3 26s ease-in-out infinite;
}

@keyframes lgOrb1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40%      { transform: translate(-35px, 45px) scale(1.08); }
  70%      { transform: translate(20px, -25px) scale(0.95); }
}
@keyframes lgOrb2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(45px, -35px) scale(1.06); }
}
@keyframes lgOrb3 {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(-25px, 35px); }
}

.lg-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image:
    radial-gradient(ellipse 85% 85% at 50% 50%, black 40%, transparent 100%);
  -webkit-mask-image:
    radial-gradient(ellipse 85% 85% at 50% 50%, black 40%, transparent 100%);
}

/* ── Two-column shell ── */
.login-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}

/* ── LEFT PANEL ── */
.login-left {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 3rem;
  background: rgba(8, 8, 8, 0.4);
  border-right: 1px solid var(--border-color);
}

.login-left::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(99, 102, 241, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.login-left-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.login-left-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 3.5rem;
}

.login-left-tagline {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -1.2px;
  line-height: 1.15;
  color: var(--text-primary);
  text-align: center;
}

.lg-gradient-text {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: lgShimmer 5s linear infinite;
}

@keyframes lgShimmer {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* ── Logo ── */
.lg-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lg-logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-sm);
  flex-shrink: 0;
}

.lg-logo-text {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: var(--text-primary);
}

.lg-logo-text span {
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Knowledge network (login variant) ── */
.lg-kn-scene {
  position: relative;
  width: min(420px, 80%);
  aspect-ratio: 1;
  flex-shrink: 0;
}

.lg-kn-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.lg-kn-line {
  stroke: rgba(99, 102, 241, 0.15);
  stroke-width: 1;
  stroke-dasharray: 6 4;
  animation: lgLinePulse 4s ease-in-out infinite;
}

.lg-kn-line-1 { animation-delay: 0s; }
.lg-kn-line-2 { animation-delay: 0.6s; }
.lg-kn-line-3 { animation-delay: 1.2s; }
.lg-kn-line-4 { animation-delay: 1.8s; }
.lg-kn-line-5 { animation-delay: 0.3s; }
.lg-kn-line-6 { animation-delay: 1.5s; }

.lg-kn-line-x {
  stroke: rgba(168, 85, 247, 0.08);
  stroke-width: 0.75;
  stroke-dasharray: 4 6;
  animation-delay: 2s;
}

@keyframes lgLinePulse {
  0%, 100% { stroke-opacity: 0.4; }
  50%      { stroke-opacity: 1; }
}

.lg-kn-hub {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 0 30px rgba(99, 102, 241, 0.4),
    0 0 60px rgba(99, 102, 241, 0.15);
  animation: lgHubPulse 3s ease-in-out infinite;
  z-index: 2;
}

@keyframes lgHubPulse {
  0%, 100% { box-shadow: 0 0 30px rgba(99,102,241,0.4), 0 0 60px rgba(99,102,241,0.15); }
  50%      { box-shadow: 0 0 40px rgba(99,102,241,0.6), 0 0 80px rgba(99,102,241,0.25); }
}

.lg-kn-node {
  position: absolute;
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  z-index: 1;
}

.lg-kn-node span {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.lg-kn-node-1 { top: calc(80/400*100% - 27px);  left: calc(85/400*100% - 27px);  animation: lgNF1 6s ease-in-out infinite, lgNG1 8s ease-in-out infinite; }
.lg-kn-node-2 { top: calc(95/400*100% - 27px);  left: calc(330/400*100% - 27px); animation: lgNF2 7s ease-in-out infinite, lgNG2 9s ease-in-out infinite 1s; }
.lg-kn-node-3 { top: calc(260/400*100% - 27px); left: calc(60/400*100% - 27px);  animation: lgNF3 8s ease-in-out infinite, lgNG3 10s ease-in-out infinite 2s; }
.lg-kn-node-4 { top: calc(310/400*100% - 27px); left: calc(320/400*100% - 27px); animation: lgNF4 7s ease-in-out infinite, lgNG1 9s ease-in-out infinite 3s; }
.lg-kn-node-5 { top: calc(50/400*100% - 27px);  left: calc(200/400*100% - 27px); animation: lgNF5 6.5s ease-in-out infinite, lgNG2 8s ease-in-out infinite 0.5s; }
.lg-kn-node-6 { top: calc(340/400*100% - 27px); left: calc(110/400*100% - 27px); animation: lgNF6 7.5s ease-in-out infinite, lgNG3 9s ease-in-out infinite 1.5s; }

@keyframes lgNF1 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-4px,6px); } }
@keyframes lgNF2 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(5px,-4px); } }
@keyframes lgNF3 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-6px,-5px); } }
@keyframes lgNF4 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(4px,5px); } }
@keyframes lgNF5 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(5px,4px); } }
@keyframes lgNF6 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-5px,3px); } }

@keyframes lgNG1 {
  0%,80%,100% { border-color: rgba(255,255,255,0.1); background: rgba(255,255,255,0.04); }
  90%         { border-color: rgba(99,102,241,0.5);   background: rgba(99,102,241,0.08); }
}
@keyframes lgNG2 {
  0%,80%,100% { border-color: rgba(255,255,255,0.1); background: rgba(255,255,255,0.04); }
  90%         { border-color: rgba(168,85,247,0.5);   background: rgba(168,85,247,0.08); }
}
@keyframes lgNG3 {
  0%,80%,100% { border-color: rgba(255,255,255,0.1); background: rgba(255,255,255,0.04); }
  90%         { border-color: rgba(6,182,212,0.5);    background: rgba(6,182,212,0.08); }
}

.lg-kn-pulse {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  z-index: 3;
  opacity: 0;
}

.lg-kn-pulse-1 {
  background: #818cf8;
  box-shadow: 0 0 8px rgba(99,102,241,0.8);
  animation: lgP1 4s ease-in-out infinite;
}
.lg-kn-pulse-2 {
  background: #c084fc;
  box-shadow: 0 0 8px rgba(168,85,247,0.8);
  animation: lgP2 5s ease-in-out infinite 1.5s;
}
.lg-kn-pulse-3 {
  background: #22d3ee;
  box-shadow: 0 0 8px rgba(6,182,212,0.8);
  animation: lgP3 4.5s ease-in-out infinite 3s;
}

@keyframes lgP1 {
  0%  { top: 20%; left: 21.25%; opacity: 0; }
  10% { opacity: 1; }
  50% { top: calc(50% - 4px); left: calc(50% - 4px); opacity: 1; }
  60% { opacity: 0; }
  100%{ opacity: 0; }
}
@keyframes lgP2 {
  0%  { top: 23.75%; left: 82.5%; opacity: 0; }
  10% { opacity: 1; }
  50% { top: calc(50% - 4px); left: calc(50% - 4px); opacity: 1; }
  60% { opacity: 0; }
  100%{ opacity: 0; }
}
@keyframes lgP3 {
  0%  { top: 65%; left: 15%; opacity: 0; }
  10% { opacity: 1; }
  50% { top: calc(50% - 4px); left: calc(50% - 4px); opacity: 1; }
  60% { opacity: 0; }
  100%{ opacity: 0; }
}

/* ── RIGHT PANEL — form ── */
.login-right {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  overflow-y: auto;
}

.login-form-container {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Header ── */
.lg-header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.lg-header-center {
  text-align: center;
  align-items: center;
}

.lg-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--text-primary);
}

.lg-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ── Error banner ── */
.lg-error {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md, 10px);
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: #f87171;
  font-size: 0.85rem;
  line-height: 1.5;
}

.lg-error:focus { outline: none; }

.lg-error > svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.lg-error-body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.lg-error-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: #fbbf24;
  transition: opacity 0.2s;
}

.lg-error-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.lg-error-link:focus-visible {
  outline: 2px solid #fbbf24;
  outline-offset: 2px;
  border-radius: 2px;
}

.lg-error-warn {
  background: rgba(251, 191, 36, 0.08);
  border-color: rgba(251, 191, 36, 0.3);
  color: #fbbf24;
}

/* ── Inline field errors ── */
.lg-field-error {
  font-size: 0.78rem;
  color: #f87171;
  padding-left: 0.2rem;
}

.lg-input-invalid input {
  border-color: rgba(248, 113, 113, 0.6);
}

.lg-input-invalid input:focus {
  border-color: #f87171;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.15);
  background: rgba(248, 113, 113, 0.04);
}

/* ── Form ── */
.lg-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.lg-field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.lg-field label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
}

/* ── Input wrapper ── */
.lg-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.lg-input-icon {
  position: absolute;
  left: 0.9rem;
  color: var(--text-muted);
  pointer-events: none;
  flex-shrink: 0;
}

.lg-input-wrap input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.7rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md, 10px);
  font-size: 0.925rem;
  color: var(--text-primary);
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.lg-input-wrap input::placeholder {
  color: var(--text-muted);
}

.lg-input-wrap input:focus {
  border-color: var(--accent-1, #6366f1);
  background: rgba(99, 102, 241, 0.05);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.lg-input-wrap input:focus-visible {
  outline: none;
  border-color: var(--accent-1, #6366f1);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

/* ── Password toggle ── */
.lg-pw-field input {
  padding-right: 2.9rem;
}

.lg-pw-toggle {
  position: absolute;
  right: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.2s, background 0.2s;
}

.lg-pw-toggle:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
}

.lg-pw-toggle:focus-visible {
  outline: 2px solid var(--accent-1, #6366f1);
  outline-offset: 2px;
}

/* ── Options row ── */
.lg-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.1rem;
}

.lg-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.lg-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.lg-checkmark {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--border-color);
  background: rgba(255, 255, 255, 0.04);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  position: relative;
}

.lg-checkmark::after {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  transform: scale(0);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lg-checkbox:checked + .lg-checkmark {
  border-color: var(--accent-1, #6366f1);
  background: rgba(99, 102, 241, 0.08);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.lg-checkbox:checked + .lg-checkmark::after {
  transform: scale(1);
}

.lg-checkbox:focus-visible + .lg-checkmark {
  outline: 2px solid var(--accent-1, #6366f1);
  outline-offset: 2px;
}

.lg-forgot-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
  white-space: nowrap;
  text-decoration: none;
}

.lg-forgot-link:hover {
  color: var(--accent-1, #6366f1);
}

.lg-forgot-link:focus-visible {
  outline: 2px solid var(--accent-1, #6366f1);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ── Submit button ── */
.lg-submit-btn {
  width: 100%;
  padding: 0.9rem;
  margin-top: 0.5rem;
  border-radius: var(--radius-md, 10px);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-1, #6366f1), var(--accent-2, #a855f7));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: var(--glow-sm, 0 0 12px rgba(99, 102, 241, 0.45));
}

.lg-submit-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--glow-md, 0 0 30px rgba(99, 102, 241, 0.35));
}

.lg-submit-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.lg-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ── Spinner ── */
.lg-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: lgSpin 0.7s linear infinite;
  flex-shrink: 0;
}

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

/* ── Footer link ── */
.lg-footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.lg-footer a {
  color: var(--accent-1, #6366f1);
  font-weight: 600;
  transition: opacity 0.2s;
}

.lg-footer a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.lg-footer a:focus-visible {
  outline: 2px solid var(--accent-1, #6366f1);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ── Responsive ── */

/* Hide left panel, single-column form */
@media (max-width: 900px) {
  .login-inner {
    grid-template-columns: 1fr;
  }

  .login-left {
    display: none;
  }

  .login-right {
    min-height: 100vh;
  }
}

/* Short viewports — let card scroll */
@media (max-height: 580px) {
  .login-right {
    align-items: flex-start;
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .login-right {
    padding: 2rem 1.25rem;
    align-items: flex-start;
    padding-top: 3rem;
  }

  .login-form-container {
    max-width: 100%;
  }

  .lg-title {
    font-size: 1.65rem;
  }

  .lg-subtitle {
    font-size: 0.84rem;
  }

  .lg-error {
    font-size: 0.8rem;
    padding: 0.65rem 0.85rem;
  }

  .lg-input-wrap input {
    padding-top: 0.85rem;
    padding-bottom: 0.85rem;
    min-height: 44px;
  }

  .lg-pw-toggle {
    width: 36px;
    height: 36px;
  }

  .lg-submit-btn {
    min-height: 48px;
  }

  .lg-checkmark {
    width: 20px;
    height: 20px;
  }

  .lg-checkmark::after {
    width: 12px;
    height: 12px;
  }

  .lg-success-icon-wrap {
    width: 64px;
    height: 64px;
  }

  .lg-res-icon {
    width: 36px;
    height: 36px;
  }
}

/* Extra-small screens */
@media (max-width: 360px) {
  .login-right {
    padding: 1.5rem 1rem;
    padding-top: 2.5rem;
  }

  .lg-title {
    font-size: 1.45rem;
  }

  .lg-input-wrap input {
    font-size: 0.875rem;
    padding-left: 2.4rem;
  }

  .lg-pw-field input {
    padding-right: 2.7rem;
  }

  .lg-submit-btn {
    padding: 0.8rem;
    font-size: 0.925rem;
  }

  .lg-options-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  .lg-forgot-link {
    align-self: flex-end;
  }
}

/* ── Forgot password specific ── */
.lg-back-link {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row;
  gap: 0.5rem;
  margin-top: 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

.lg-success-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  padding: 1rem 0;
  animation: lgFadeUp 0.5s ease-out;
}

@keyframes lgFadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.lg-success-icon-wrap {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #10b981;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

.lg-success-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.lg-success-text strong {
  color: var(--text-primary);
}

.lg-success-actions {
  width: 100%;
}