@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700;800&display=swap');

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-elevated: #1a1a1a;
  --border: #2a2a2a;
  
  --accent: #f5f5f5;
  --accent-muted: #666666;
  --text-secondary: #888888;
  
  --success: #22c55e;
  --error: #ef4444;
  
  --font: 'JetBrains Mono', monospace;
  
  --shadow-x: 0px;
  --shadow-y: 4px;
}

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

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--accent);
  overflow: hidden;
}

.starfield {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.star {
  position: absolute;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0;
  animation: twinkle var(--duration) ease-in-out infinite;
  animation-delay: var(--delay);
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.5); }
  50% { opacity: var(--max-opacity); transform: scale(1); }
}

.scene {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

.card {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3rem 2.5rem;
  position: relative;
  transition: transform 150ms ease-out, box-shadow 150ms ease-out;
  box-shadow: 
    calc(var(--shadow-x) * 1) calc(var(--shadow-y) * 1) 0 0 var(--border),
    calc(var(--shadow-x) * 2) calc(var(--shadow-y) * 2) 0 0 var(--surface-elevated),
    calc(var(--shadow-x) * 3) calc(var(--shadow-y) * 3) 0 0 var(--border),
    calc(var(--shadow-x) * 4) calc(var(--shadow-y) * 4) 24px -4px rgba(0,0,0,0.5);
}

.card:hover {
  transform: rotate(0.3deg);
}

.card-content {
  position: relative;
  z-index: 10;
}

h1 {
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  line-height: 1.1;
  min-height: 1.2em;
}

h1 .word {
  display: inline-block;
  opacity: 0;
  filter: blur(8px);
  transform: translateY(8px);
  transition: opacity 300ms ease-out, filter 300ms ease-out, transform 300ms ease-out;
}

h1 .word.visible {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
}

.input-wrapper {
  position: relative;
  margin-bottom: 2rem;
}

.input-wrapper input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--border);
  padding: 1rem 0 0.75rem;
  font-size: 1.25rem;
  font-family: var(--font);
  color: var(--accent);
  transition: border-color 150ms ease-out;
  outline: none;
}

.input-wrapper input:focus {
  border-color: var(--accent-muted);
}

.input-wrapper input.error {
  animation: borderBlink 400ms ease-out;
  border-color: var(--error);
}

@keyframes borderBlink {
  0%, 100% { border-color: var(--error); }
  50% { border-color: transparent; }
}

.input-wrapper label {
  position: absolute;
  left: 0;
  top: 1rem;
  font-size: 1rem;
  color: var(--accent-muted);
  pointer-events: none;
  transition: all 150ms ease-out;
}

.input-wrapper input:focus + label,
.input-wrapper input:not(:placeholder-shown) + label {
  top: -0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.input-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 300ms ease-out;
}

.input-wrapper input:focus ~ .input-line {
  width: 100%;
}

.btn {
  width: 100%;
  padding: 1rem 2rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 100ms ease-out, box-shadow 100ms ease-out;
  box-shadow: 0 4px 0 0 var(--border);
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 0 var(--border);
}

.btn:active:not(:disabled) {
  transform: translateY(2px) scale(0.98);
  box-shadow: 0 2px 0 0 var(--border);
}

.btn:disabled {
  cursor: not-allowed;
}

.btn-text,
.btn-loader,
.btn-check {
  transition: opacity 200ms ease-out, transform 200ms ease-out;
}

.btn-loader,
.btn-check {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
}

.btn-loader {
  width: 20px;
  height: 20px;
  border: 2px solid var(--bg);
  border-top-color: transparent;
  border-radius: 50%;
}

.btn-check {
  width: 24px;
  height: 24px;
}

.btn-check svg {
  width: 100%;
  height: 100%;
}

.btn.loading .btn-text {
  opacity: 0;
  transform: scale(0.8);
}

.btn.loading .btn-loader {
  opacity: 1;
  animation: spin 600ms linear infinite;
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.btn.success {
  background: var(--success);
}

.btn.success .btn-text {
  opacity: 0;
  transform: scale(0.8);
}

.btn.success .btn-check {
  opacity: 1;
  animation: checkIn 300ms ease-out;
}

@keyframes checkIn {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.5);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.status-text {
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  min-height: 1.5rem;
  text-align: center;
  opacity: 0;
  transition: opacity 200ms ease-out;
}

.status-text.visible {
  opacity: 1;
}

.status-text.error {
  color: var(--error);
}

.status-text.success {
  color: var(--success);
}

@media (max-width: 540px) {
  .card {
    padding: 2rem 1.5rem;
  }
  
  h1 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
  }
}