:root {
  --primary: #c40000;
  --primary-hover: #e60000;
  --bg-dark: #050505;
  --bg-card: #0f0f0f;
  --bg-input: #141414;
  --text-main: #ffffff;
  --text-muted: #888888;
  --text-error: #ffcccc;
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(196, 0, 0, 0.5);
  --radius-card: 20px;
  --radius-input: 12px;
  --shadow-card: 0 20px 60px -10px rgba(0, 0, 0, 0.9);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --anim-duration: 0.4s;
}

html {
  box-sizing: border-box;
  font-size: 100%;
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  background-color: var(--bg-dark);
  background-image: radial-gradient(
    circle at 50% -20%,
    #2a0000 0%,
    var(--bg-dark) 70%
  );
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 20px;
  overflow-x: hidden;
}

.wrapper {
  width: 100%;
  max-width: 100%;
  display: flex;
  justify-content: center;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: clamp(1.5rem, 5vw, 3rem);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  animation: cardEnter 0.6s var(--ease) forwards;
}

.login-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  box-shadow: 0 0 20px var(--primary);
  opacity: 0.9;
}

.login-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.login-header h2 {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.login-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  font-weight: 500;
  margin-left: 4px;
}

.input-wrapper {
  position: relative;
}

input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-main);
  font-size: 1rem;
  transition: all 0.2s ease;
  outline: none;
  font-family: inherit;
}

#phone {
  padding: 14px 16px 14px 44px;
}

.input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  fill: var(--text-muted);
  transition: fill 0.2s ease;
  pointer-events: none;
}

input:focus {
  border-color: var(--primary);
  background: #181818;
  box-shadow: 0 0 0 4px rgba(196, 0, 0, 0.1);
}

input:focus + .input-icon {
  fill: var(--primary);
}

#otp-input {
  text-align: center;
  padding: 14px;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: clamp(0.2em, 4vw, 0.8em);
  font-variant-numeric: tabular-nums;
}

.otp-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 0 4px;
}

#display-number {
  color: #fff;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.btn-edit {
  background: transparent;
  border: none;
  color: var(--text-muted);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.85rem;
  transition: color 0.2s;
  padding: 4px;
}

.btn-edit:hover {
  color: var(--text-main);
}

.btn-submit {
  width: 100%;
  background-color: var(--primary);
  color: white;
  padding: 16px;
  border: none;
  border-radius: var(--radius-input);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--ease);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.8rem;
  margin-top: 10px;
}

.btn-submit:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(196, 0, 0, 0.3);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: #333;
}

.helper-text {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 6px;
  margin-left: 4px;
}

.error-box {
  background: rgba(196, 0, 0, 0.1);
  border: 1px solid var(--primary);
  color: var(--text-error);
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 20px;
  text-align: center;
  font-size: 0.9rem;
  animation: fadeIn 0.3s ease;
}

.hidden {
  display: none !important;
}

.fade-in {
  animation: fadeIn var(--anim-duration) var(--ease) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 360px) {
  .login-card {
    padding: 1.5rem;
    border: none;
    background: transparent;
    box-shadow: none;
  }

  .login-card::before {
    display: none;
  }

  #otp-input {
    font-size: 1.2rem;
    letter-spacing: 0.2em;
  }
}

@media (max-height: 500px) and (orientation: landscape) {
  body {
    padding: 10px;
  }

  .wrapper {
    align-items: flex-start;
  }

  .login-card {
    margin-bottom: 20px;
  }

  .login-header {
    margin-bottom: 1.5rem;
  }
}