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

:root {
  --bg: #fafafa;
  --text: #0b0b0b;
  --text-secondary: #6b6b6b;
  --accent: #ff3b30;
  --accent-soft: #ffe5e3;
  --card-bg: #ffffff;
  --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  --input-bg: #ffffff;
  --input-border: #e2e2e2;
  --input-focus: #ff3b30;
  --bar-bg: #efefef;
  --divider: #efefef;
  --button-bg: #0b0b0b;
  --button-text: #fff;
  --button-secondary-bg: transparent;
  --button-secondary-border: #e2e2e2;
  --button-secondary-text: #0b0b0b;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --text: #f5f5f5;
  --text-secondary: #a1a1a1;
  --accent: #ff453a;
  --accent-soft: rgba(255, 69, 58, 0.15);
  --card-bg: #111111;
  --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
  --input-bg: #1c1c1c;
  --input-border: #2e2e2e;
  --input-focus: #ff453a;
  --bar-bg: #1c1c1c;
  --divider: #1e1e1e;
  --button-bg: #f5f5f5;
  --button-text: #0b0b0b;
  --button-secondary-bg: transparent;
  --button-secondary-border: #2e2e2e;
  --button-secondary-text: #f5f5f5;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition:
    background 0.3s ease,
    color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  padding-top: 12px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text);
  text-decoration: none;
}

.logo-icon {
  color: var(--accent);
  flex-shrink: 0;
}

/* Hero */
.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 440px;
  margin: 0 auto;
}

/* Card */
.card {
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 28px 24px;
  margin-bottom: 20px;
  transition:
    background 0.3s ease,
    box-shadow 0.3s ease;
}

.card-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* Form */
.field {
  margin-bottom: 20px;
}

.field:last-child {
  margin-bottom: 0;
}

.field label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

.field label .optional {
  font-weight: 400;
  color: var(--text-secondary);
  font-size: 13px;
}

.field-icon {
  color: var(--text-secondary);
  flex-shrink: 0;
}

.input-wrapper {
  position: relative;
}

.input-prefix {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 17px;
  color: var(--text-secondary);
  pointer-events: none;
  font-weight: 500;
}

.input-suffix {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 17px;
  color: var(--text-secondary);
  pointer-events: none;
  font-weight: 500;
}

input[type="text"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 17px;
  font-family: inherit;
  border: 1.5px solid var(--input-border);
  border-radius: 12px;
  background: var(--input-bg);
  color: var(--text);
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  -webkit-appearance: none;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(255, 59, 48, 0.12);
}

input.has-prefix {
  padding-left: 44px;
}

input.has-suffix {
  padding-right: 36px;
}

.field-error {
  font-size: 13px;
  color: var(--accent);
  margin-top: 6px;
  min-height: 20px;
  transition: opacity 0.2s ease;
}

input.invalid {
  border-color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px 24px;
  font-size: 17px;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    opacity 0.15s ease,
    background 0.2s ease;
  -webkit-appearance: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--button-bg);
  color: var(--button-text);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-text);
  border: 1.5px solid var(--button-secondary-border);
  font-size: 15px;
  padding: 12px 20px;
}

.btn-secondary:hover {
  opacity: 0.7;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.btn-row .btn {
  flex: 1;
}

/* Results */
.results {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
  pointer-events: none;
}

.results.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Result hero */
.result-hero {
  text-align: center;
  padding: 20px 0 16px;
}

.result-hero-badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.result-hero-number {
  font-size: 80px;
  font-weight: 800;
  letter-spacing: -4px;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 10px;
}

.result-hero-label {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
  max-width: 240px;
  margin: 0 auto;
}

/* Result stat */
.result-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  gap: 16px;
}

.result-stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.result-stat-value {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.result-divider {
  height: 1px;
  background: var(--divider);
  margin: 20px 0;
}

/* Comparison bars */
.comparison {
  margin-top: 8px;
}

.comparison-item {
  margin-bottom: 20px;
}

.comparison-item:last-child {
  margin-bottom: 0;
}

.comparison-header {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 8px;
}

.comparison-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.3;
}

.comparison-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.comparison-value.accent {
  color: var(--accent);
  font-size: 36px;
}

.bar-track {
  width: 100%;
  height: 12px;
  background: var(--bar-bg);
  border-radius: 6px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
  width: 0;
}

.bar-fill.nota {
  background: var(--text-secondary);
}

.bar-fill.real {
  background: var(--accent);
}

/* Explanation */
.explanation {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.explanation p {
  margin-bottom: 12px;
}

.explanation p:last-child {
  margin-bottom: 0;
}

/* Share section */
.share-section {
  text-align: center;
}

.share-section .card-title {
  text-align: center;
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

footer a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-decoration-color: var(--divider);
  text-underline-offset: 2px;
}

/* Feedback toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--button-bg);
  color: var(--button-text);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 500;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition:
    transform 0.3s ease,
    opacity 0.3s ease;
  z-index: 100;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: 12px 16px 56px;
  }

  header {
    margin-bottom: 28px;
  }

  .hero {
    margin-bottom: 28px;
  }

  .hero h1 {
    font-size: 24px;
    letter-spacing: -0.3px;
  }

  .hero p {
    font-size: 15px;
  }

  .card {
    padding: 20px 16px;
    border-radius: 14px;
    margin-bottom: 14px;
  }

  .result-hero-number {
    font-size: 64px;
    letter-spacing: -3px;
  }

  .result-stat-value {
    font-size: 18px;
  }

  .comparison-value {
    font-size: 26px;
  }

  .comparison-value.accent {
    font-size: 32px;
  }

  .btn {
    padding: 15px 20px;
    font-size: 16px;
  }

  .btn-secondary {
    font-size: 14px;
    padding: 11px 14px;
  }

  .btn-row {
    flex-direction: column;
    gap: 8px;
  }

  .toast {
    bottom: 20px;
    width: calc(100% - 32px);
    text-align: center;
  }
}