/* Light theme (default) */
:root {
  color-scheme: light;
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --border: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #0891b2;
  --accent-glow: rgba(8, 145, 178, 0.15);
  --warning: #d97706;
  --warning-glow: rgba(217, 119, 6, 0.15);
  --danger: #dc2626;
  --danger-glow: rgba(220, 38, 38, 0.15);
  --success: #059669;
  --success-glow: rgba(5, 150, 105, 0.15);
  --purple: #7c3aed;
  --pink: #db2777;
  --toggle-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Dark theme */
html[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #0a0e14;
  --bg-secondary: #12171f;
  --bg-card: #1a2029;
  --bg-input: #0d1117;
  --border: #2a3441;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #22d3ee;
  --accent-glow: rgba(34, 211, 238, 0.15);
  --warning: #f59e0b;
  --warning-glow: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.15);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.15);
  --purple: #a78bfa;
  --pink: #f472b6;
  --toggle-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: "DM Sans", system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Background pattern - light */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(
      ellipse at 20% 0%,
      rgba(8, 145, 178, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 100%,
      rgba(124, 58, 237, 0.06) 0%,
      transparent 50%
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 100px,
      rgba(0, 0, 0, 0.03) 100px,
      rgba(0, 0, 0, 0.03) 101px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 100px,
      rgba(0, 0, 0, 0.03) 100px,
      rgba(0, 0, 0, 0.03) 101px
    );
  pointer-events: none;
  z-index: -1;
}

/* Background pattern - dark */
html[data-theme="dark"] body::before {
  background:
    radial-gradient(
      ellipse at 20% 0%,
      rgba(34, 211, 238, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 100%,
      rgba(167, 139, 250, 0.06) 0%,
      transparent 50%
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 100px,
      rgba(42, 52, 65, 0.1) 100px,
      rgba(42, 52, 65, 0.1) 101px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 100px,
      rgba(42, 52, 65, 0.1) 100px,
      rgba(42, 52, 65, 0.1) 101px
    );
}

/* Theme toggle button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--toggle-shadow);
  z-index: 100;
  transition: all 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}

.theme-toggle .icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
}

.theme-toggle .icon-moon {
  display: none;
  fill: currentColor;
  stroke: none;
}

html[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .main-grid {
    grid-template-columns: 380px 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  animation: fadeInUp 0.6s ease-out backwards;
}

.card-title {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-title::before {
  content: "";
  width: 3px;
  height: 1em;
  background: var(--accent);
  border-radius: 2px;
}

/* Inputs Panel */
.inputs-panel {
  animation-delay: 0.1s;
}

.currency-toggle {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0.25rem;
  background: var(--bg-input);
  border-radius: 10px;
  border: 1px solid var(--border);
}

.currency-btn {
  flex: 1;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.currency-btn.active {
  background: var(--accent);
  color: var(--bg-primary);
}

.currency-btn:hover:not(.active) {
  background: rgba(255, 255, 255, 0.05);
}

.input-group {
  margin-bottom: 1.25rem;
}

.input-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.input-wrapper {
  position: relative;
}

.input-prefix,
.input-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.9rem;
  pointer-events: none;
}

.input-prefix {
  left: 1rem;
}

.input-suffix {
  right: 1rem;
}

input[type="number"],
input[type="text"] {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
  font-size: 1rem;
  transition: all 0.2s;
}

input.has-prefix {
  padding-left: 2.5rem;
}

input.has-suffix {
  padding-right: 2.5rem;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Presets */
.presets {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.preset-btn {
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Results Panel */
.results-panel {
  animation-delay: 0.2s;
}

.summary-box {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.summary-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--purple), var(--pink));
}

.summary-text {
  font-size: 1.1rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.summary-text .highlight {
  font-weight: 700;
  font-family: "JetBrains Mono", monospace;
}

.summary-text .highlight.amount {
  color: var(--accent);
}

.summary-text .highlight.time {
  color: var(--purple);
}

.summary-text .highlight.warning {
  color: var(--warning);
}

.summary-text .highlight.danger {
  color: var(--danger);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
  .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.metric {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  transition: all 0.2s;
}

.metric:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.metric-value {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.metric.success .metric-value {
  color: var(--success);
}
.metric.warning .metric-value {
  color: var(--warning);
}
.metric.danger .metric-value {
  color: var(--danger);
}
.metric.accent .metric-value {
  color: var(--accent);
}
.metric.purple .metric-value {
  color: var(--purple);
}

/* Charts */
.charts-section {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .charts-section {
    grid-template-columns: 2fr 1fr;
  }
}

.chart-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.chart-title {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.line-chart {
  width: 100%;
  height: 200px;
}

.bar-chart {
  height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.stacked-bar {
  display: flex;
  height: 48px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--bg-primary);
  transition: flex 0.4s ease;
  min-width: 0;
}

.bar-segment.principal {
  background: var(--accent);
}
.bar-segment.interest {
  background: var(--warning);
}
.bar-segment.fees {
  background: var(--danger);
}

.bar-legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.legend-dot.principal {
  background: var(--accent);
}
.legend-dot.interest {
  background: var(--warning);
}
.legend-dot.fees {
  background: var(--danger);
}

.legend-value {
  margin-left: auto;
  font-family: "JetBrains Mono", monospace;
  font-weight: 500;
  color: var(--text-primary);
}

/* Education Cards */
.education-section {
  margin-top: 2rem;
}

.education-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 768px) {
  .education-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.3s;
  animation: fadeInUp 0.6s ease-out backwards;
}

.edu-card:nth-child(1) {
  animation-delay: 0.3s;
}
.edu-card:nth-child(2) {
  animation-delay: 0.4s;
}
.edu-card:nth-child(3) {
  animation-delay: 0.5s;
}

.edu-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.edu-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.edu-card:nth-child(2) .edu-icon {
  background: var(--warning-glow);
}

.edu-card:nth-child(3) .edu-icon {
  background: var(--danger-glow);
}

.edu-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.edu-value {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.edu-card:nth-child(1) .edu-value {
  color: var(--accent);
}
.edu-card:nth-child(2) .edu-value {
  color: var(--warning);
}
.edu-card:nth-child(3) .edu-value {
  color: var(--danger);
}

.edu-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Warning Banner */
.warning-banner {
  display: none;
  background: linear-gradient(135deg, var(--danger-glow), transparent);
  border: 1px solid var(--danger);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  color: var(--danger);
  font-weight: 500;
  align-items: center;
  gap: 0.75rem;
}

.warning-banner.visible {
  display: flex;
}

.warning-icon {
  font-size: 1.25rem;
}

/* SVG Styles */
.chart-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-area {
  fill: url(#chartGradient);
}

.chart-grid line {
  stroke: var(--border);
  stroke-dasharray: 4 4;
}

.chart-axis text {
  fill: var(--text-muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
}

.chart-dot {
  fill: var(--accent);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
  display: grid;
  gap: 0.5rem;
  animation: fadeInUp 0.5s ease-out 0.3s both;
}

.footer__links {
  font-weight: 600;
  color: var(--text-secondary);
}

.footer__links a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

.footer__links a:hover {
  text-decoration: underline;
}

.footer__meta {
  color: var(--text-muted);
  font-size: 0.85rem;
}