/* ----- ログイン画面専用スタイル ----- */

/* ----- Page Layout ----- */
.login-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: var(--slate-50);
  overflow: hidden;
}

/* ----- Dark Navbar (共通と同じスタイル) ----- */
.login-nav {
  display: flex;
  align-items: center;
  padding: 0 2rem;
  height: 56px;
  background-color: var(--slate-800);
  flex-shrink: 0;
  z-index: 10;
}

.login-nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.login-nav-brand i {
  opacity: 0.85;
  font-size: 1rem;
}

/* ----- Body (center card + animated background) ----- */
.login-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* ----- Animated Background ----- */
.login-bg-animation {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

/* Floating arcs */
.login-bg-animation .arc {
  position: absolute;
  border-radius: 50%;
  border-style: solid;
  border-color: transparent;
}

.login-bg-animation .arc:nth-child(1) {
  width: 400px;
  height: 400px;
  top: -80px;
  right: -100px;
  border-width: 2px;
  border-color: var(--emerald-400, #34d399);
  opacity: 0.35;
  animation: arc-drift-1 25s ease-in-out infinite;
}

.login-bg-animation .arc:nth-child(2) {
  width: 300px;
  height: 300px;
  bottom: -60px;
  left: -80px;
  border-width: 2px;
  border-color: var(--slate-300, #cbd5e1);
  opacity: 0.7;
  animation: arc-drift-2 30s ease-in-out infinite;
}

.login-bg-animation .arc:nth-child(3) {
  width: 200px;
  height: 200px;
  top: 30%;
  left: 15%;
  border-width: 2px;
  border-color: var(--emerald-300, #6ee7b7);
  opacity: 0.4;
  animation: arc-drift-3 20s ease-in-out infinite;
}

.login-bg-animation .arc:nth-child(4) {
  width: 500px;
  height: 500px;
  bottom: -150px;
  right: 10%;
  border-width: 2px;
  border-color: var(--slate-300, #cbd5e1);
  opacity: 0.5;
  animation: arc-drift-4 35s ease-in-out infinite;
}

.login-bg-animation .arc:nth-child(5) {
  width: 150px;
  height: 150px;
  top: 15%;
  right: 25%;
  border-width: 2px;
  border-color: var(--emerald-400, #34d399);
  opacity: 0.3;
  animation: arc-drift-5 22s ease-in-out infinite;
}

/* Floating dots */
.login-bg-animation .dot {
  position: absolute;
  border-radius: 50%;
  background-color: var(--emerald-500, #10b981);
}

.login-bg-animation .dot:nth-child(6) {
  width: 8px;
  height: 8px;
  top: 20%;
  left: 30%;
  opacity: 0.3;
  animation: dot-float-1 18s ease-in-out infinite;
}

.login-bg-animation .dot:nth-child(7) {
  width: 6px;
  height: 6px;
  top: 60%;
  right: 20%;
  opacity: 0.25;
  animation: dot-float-2 22s ease-in-out infinite;
}

.login-bg-animation .dot:nth-child(8) {
  width: 7px;
  height: 7px;
  bottom: 30%;
  left: 50%;
  opacity: 0.28;
  animation: dot-float-3 15s ease-in-out infinite;
}

/* Connection lines */
.login-bg-animation .line {
  position: absolute;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--emerald-300, #6ee7b7), transparent);
  opacity: 0.4;
}

.login-bg-animation .line:nth-child(9) {
  width: 240px;
  top: 35%;
  left: 5%;
  transform: rotate(-15deg);
  animation: line-fade 12s ease-in-out infinite;
}

.login-bg-animation .line:nth-child(10) {
  width: 180px;
  bottom: 25%;
  right: 8%;
  transform: rotate(20deg);
  animation: line-fade 16s ease-in-out infinite 4s;
}

/* ----- Arc Drift Animations ----- */
@keyframes arc-drift-1 {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(-30px, 20px) rotate(15deg);
  }
  66% {
    transform: translate(15px, -10px) rotate(-10deg);
  }
}

@keyframes arc-drift-2 {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(25px, -20px) rotate(20deg);
  }
}

@keyframes arc-drift-3 {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  25% {
    transform: translate(15px, 10px) rotate(-20deg);
  }
  75% {
    transform: translate(-10px, -15px) rotate(15deg);
  }
}

@keyframes arc-drift-4 {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  40% {
    transform: translate(-20px, 15px) rotate(10deg);
  }
  80% {
    transform: translate(10px, -20px) rotate(-5deg);
  }
}

@keyframes arc-drift-5 {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(20px, -25px) rotate(-15deg);
  }
}

@keyframes dot-float-1 {
  0%,
  100% {
    transform: translate(0, 0);
    opacity: 0.3;
  }
  50% {
    transform: translate(30px, -20px);
    opacity: 0.5;
  }
}

@keyframes dot-float-2 {
  0%,
  100% {
    transform: translate(0, 0);
    opacity: 0.25;
  }
  50% {
    transform: translate(-25px, 15px);
    opacity: 0.45;
  }
}

@keyframes dot-float-3 {
  0%,
  100% {
    transform: translate(0, 0);
    opacity: 0.28;
  }
  50% {
    transform: translate(15px, 25px);
    opacity: 0.45;
  }
}

@keyframes line-fade {
  0%,
  100% {
    opacity: 0.2;
  }
  50% {
    opacity: 0.5;
  }
}

/* ----- Login Card ----- */
.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
  padding: 2.5rem 2rem;
  background-color: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
  animation: card-enter 0.6s ease both;
}

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-card-header {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: 1.75rem;
}

/* Error message */
.login-error {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  padding: 0.875rem 1rem;
  background-color: var(--red-50);
  border-radius: 8px;
  margin-bottom: 1.25rem;
}

.login-error i {
  color: var(--red-600);
  font-size: 0.875rem;
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.login-error span {
  font-size: 0.8125rem;
  color: var(--red-600);
  line-height: 1.5;
}

/* Login button */
.btn-login {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  background-color: var(--emerald-500);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-login:hover {
  background-color: var(--emerald-600);
}

.btn-login:active {
  transform: scale(0.995);
}

.btn-login i {
  font-size: 1.05rem;
}

.login-help-text {
  text-align: center;
  font-size: 0.75rem;
  color: var(--slate-400);
  margin-top: 1rem;
}

/* ----- Copyright ----- */
.login-copyright {
  padding: 1.25rem 0;
  text-align: center;
  font-size: 0.6875rem;
  color: var(--slate-400);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

/* ----- Responsive ----- */
@media (max-width: 480px) {
  .login-card {
    margin: 0 1rem;
    padding: 2rem 1.5rem;
  }
}