/* ========================================
   Plate Calculator - Styles
   ======================================== */

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2e3345;
  --text: #e8eaed;
  --text-muted: #9aa0b0;
  --accent: #6c63ff;
  --accent-hover: #7b73ff;

  /* Plate colors (competition standard) */
  --plate-45: #3b6fdb;
  --plate-35: #d4a82a;
  --plate-25: #3aad5c;
  --plate-10: #e0e0e0;
  --plate-5: #d44040;
  --plate-2-5: #8a8a8a;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ---- Header ---- */

header {
  text-align: center;
  padding: 1.5rem 1rem 1rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header .subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* ---- Main ---- */

main {
  max-width: 600px;
  margin: 0 auto;
  padding: 1rem;
}

section {
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

/* ---- Settings Row ---- */

.settings-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.setting-group {
  flex: 1;
  min-width: 140px;
}

.setting-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toggle-container {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.toggle-btn {
  flex: 1;
  padding: 0.5rem 1rem;
  border: none;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.toggle-btn.active {
  background: var(--accent);
  color: #fff;
}

.toggle-btn:not(.active):hover {
  background: var(--border);
}

select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239aa0b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  cursor: pointer;
}

select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

/* ---- Weight Input ---- */

.input-section {
  text-align: center;
}

.input-section > label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.weight-input-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.adjust-btn {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-size: 1.5rem;
  font-weight: 300;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  user-select: none;
  -webkit-user-select: none;
}

.adjust-btn:hover {
  background: var(--border);
}

.adjust-btn:active {
  background: var(--accent);
}

#target-weight {
  width: 120px;
  height: 56px;
  border: 2px solid var(--accent);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  -moz-appearance: textfield;
}

#target-weight::-webkit-outer-spin-button,
#target-weight::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

#target-weight:focus {
  outline: none;
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.25);
}

.weight-message {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  min-height: 1.3em;
}

.weight-message.warning {
  color: #f0a840;
}

.weight-message.info {
  color: var(--text-muted);
}

/* ---- Barbell Section ---- */

.barbell-section {
  text-align: center;
}

.plate-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  min-height: 1.4em;
}

.barbell-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0.5rem 0;
}

.barbell-diagram {
  min-width: 320px;
}

#barbell-svg {
  width: 100%;
  height: auto;
}

/* ---- Available Plates ---- */

.plates-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.plate-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
  -webkit-user-select: none;
}

.plate-checkbox:hover {
  border-color: var(--accent);
}

.plate-checkbox.checked {
  border-color: var(--accent);
  background: rgba(108, 99, 255, 0.1);
}

.plate-checkbox input {
  display: none;
}

.plate-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
}

.plate-checkbox span {
  font-size: 0.85rem;
  font-weight: 500;
}

.plate-check-icon {
  margin-left: auto;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color 0.15s, background 0.15s;
}

.plate-checkbox.checked .plate-check-icon {
  border-color: var(--accent);
  background: var(--accent);
}

.plate-check-icon::after {
  content: "";
  display: none;
  width: 6px;
  height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}

.plate-checkbox.checked .plate-check-icon::after {
  display: block;
}

/* ---- Warmup Section ---- */

.warmup-section {
  margin-top: 1.5rem;
}

.warmup-description {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.warmup-sets {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.warmup-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
}

.warmup-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.warmup-set-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.warmup-set-label.working {
  color: var(--accent);
  font-weight: 600;
}

.warmup-weight {
  font-size: 1.1rem;
  font-weight: 700;
}

.warmup-plates-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.warmup-barbell-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.warmup-barbell-container svg {
  width: 100%;
  height: auto;
  min-width: 280px;
}

/* ---- Affiliate Section ---- */

.affiliate-section {
  margin-top: 1.5rem;
}

.affiliate-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.affiliate-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s;
}

.affiliate-card:hover {
  border-color: var(--accent);
}

.affiliate-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.affiliate-card span {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ---- Ad Container ---- */

.ad-container {
  margin: 1.25rem 0;
  min-height: 50px;
  text-align: center;
}

/* ---- SEO Content ---- */

.seo-content {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.seo-content h2 {
  color: var(--text);
}

.seo-content h3 {
  color: var(--text);
}

.seo-content p {
  margin-bottom: 0.75rem;
}

.seo-content ul {
  margin-left: 1.25rem;
  margin-bottom: 0.75rem;
}

.seo-content li {
  margin-bottom: 0.35rem;
}

/* ---- Footer ---- */

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ---- Responsive ---- */

@media (min-width: 480px) {
  .plates-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .affiliate-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 360px) {
  .plates-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  header h1 {
    font-size: 1.5rem;
  }

  #target-weight {
    width: 100px;
    font-size: 1.5rem;
  }
}