/* ============================================================
   TRADECRAFT AI — SHARED STYLE SYSTEM
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* --- CSS Custom Properties --- */
:root {
  --navy:          #070C18;
  --navy-light:    #0C1426;
  --navy-deep:     #050A14;
  --off-white:     #E2E8F0;
  --amber:         #0EA5E9;
  --amber-dim:     #0284C7;
  --amber-subtle:  rgba(14, 165, 233, 0.10);
  --slate:         #64748B;
  --slate-dim:     #475569;
  --green:         #059669;
  --green-light:   #10B981;
  --green-subtle:  rgba(16, 185, 129, 0.08);
  --red:           #EF4444;
  --text-primary:  #E2E8F0;
  --text-secondary:#CBD5E1;
  --text-muted:    #64748B;
  --border:        rgba(14, 165, 233, 0.12);
  --border-strong: rgba(226, 232, 240, 0.15);

  /* Spacing scale (base 4px) */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;
  --space-10: 128px;

  /* Section padding */
  --section-pad: 96px;

  /* Container */
  --container-max: 1200px;
  --container-narrow: 760px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-y: scroll; /* prevent nav shift when scrollbar appears/disappears between pages */
}

body {
  background-color: var(--navy);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--text-primary);
  line-height: 1.08;
  text-wrap: balance;
}

p, li, blockquote, figcaption, label, td, th {
  text-wrap: pretty;
}

h1 {
  font-size: clamp(2.8rem, 5vw, 4.8rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 3.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.2;
}

h4 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
}

h5 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

h6 {
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.03em;
}

p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Utility Classes --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.eyebrow {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  display: block;
  margin-bottom: var(--space-3);
}

.text-amber    { color: var(--amber); }
.text-slate    { color: var(--slate); }
.text-muted    { color: var(--text-muted); }
.text-green    { color: var(--green-light); }
.text-secondary { color: var(--text-secondary); }

.caption {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.mono {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 0.82rem;
  line-height: 1.65;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  padding: 0.9rem 2rem;
  border-radius: 2px;
  cursor: pointer;
  border: none;
  transition: background 150ms ease, transform 150ms ease, border-color 150ms ease;
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0); transition-duration: 80ms; }

.btn-primary {
  background: var(--amber);
  color: #fff;
}
.btn-primary:hover { background: var(--amber-dim); }

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover { border-color: var(--slate); }

.btn-full { width: 100%; }

/* Button loading spinner */
.btn .btn-spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  opacity: 0.8;
}
.btn.is-loading .btn-text { display: none; }
.btn.is-loading .btn-spinner { display: block; }

/* --- Section Backgrounds --- */
.bg-navy      { background-color: var(--navy); }
.bg-navy-light { background-color: var(--navy-light); }
.bg-navy-deep { background-color: var(--navy-deep); }
.bg-alt       { background-color: rgba(255, 255, 255, 0.03); }

/* --- Section Wrapper --- */
.section {
  padding: var(--section-pad) 0;
}

.section-header {
  margin-bottom: var(--space-8);
}

/* --- Animations --- */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.2; }
}

@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

@keyframes slide-up-in {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scale-in {
  from { transform: scale(0.97); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

@keyframes slide-up-bar {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

@keyframes toast-in {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

/* --- Scroll Animation Classes --- */
.anim-ready {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 400ms ease-out, transform 400ms ease-out;
}

.anim-ready.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-fade {
  opacity: 0;
  transition: opacity 350ms ease-out;
}

.anim-fade.is-visible { opacity: 1; }

.anim-scale {
  opacity: 0;
  transform: scale(0.97);
  transition: opacity 300ms ease-out, transform 300ms ease-out;
}

.anim-scale.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* --- Skeleton Loading --- */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.09) 50%, rgba(255,255,255,0.04) 100%);
  background-size: 400px 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 2px;
}

/* --- Validated Badge --- */
.validated-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-light);
  background: var(--green-subtle);
  border: 1px solid rgba(111, 207, 151, 0.2);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  transform: scale(0.6);
  opacity: 0;
  transition: transform 200ms ease-out, opacity 200ms ease-out;
}

.validated-badge.show {
  transform: scale(1);
  opacity: 1;
}

.validated-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--green-light);
  border-radius: 50%;
}

/* --- Live Dot --- */
.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--green-light);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

/* --- Toast Notifications --- */
#toast-container {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  width: 360px;
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: var(--space-4) var(--space-5);
  pointer-events: all;
  animation: toast-in 250ms ease forwards;
  position: relative;
}

.toast--success { border-left: 3px solid var(--green-light); }
.toast--error   { border-left: 3px solid var(--red); }
.toast--info    { border-left: 3px solid var(--amber); }

.toast-title {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.toast-body {
  font-size: 0.8rem;
  color: var(--slate);
  line-height: 1.5;
  font-family: 'Inter', system-ui, sans-serif;
}

.toast-close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: none;
  border: none;
  color: var(--slate);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: var(--space-1);
  transition: color 150ms;
}
.toast-close:hover { color: var(--text-primary); }

/* --- Modal --- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 15, 30, 0.88);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms ease, visibility 200ms ease;
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--navy-light);
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  max-width: 440px;
  width: 100%;
  padding: var(--space-7) var(--space-7);
  animation: scale-in 200ms ease forwards;
}

/* --- Form Styles --- */
.form-group {
  margin-bottom: var(--space-5);
  position: relative;
}

.form-label {
  display: block;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: var(--space-2);
  transition: color 150ms, font-size 150ms, transform 150ms;
}

.form-input {
  width: 100%;
  background: var(--navy);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.75rem 1rem;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.9rem;
  color: var(--off-white);
  transition: border-color 150ms ease;
  outline: none;
  appearance: none;
}

.form-input:focus {
  border-color: var(--amber);
}

.form-input::placeholder {
  color: var(--slate-dim);
}

.form-input.is-valid   { border-color: var(--green); }
.form-input.is-invalid { border-color: var(--red); }

.form-error {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 0.72rem;
  color: var(--red);
  margin-top: var(--space-1);
  display: none;
}

.form-input.is-invalid + .form-error { display: block; }

.form-checkmark {
  position: absolute;
  right: 0.75rem;
  bottom: 0.8rem;
  color: var(--green-light);
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 150ms, transform 200ms ease-out;
  transform: scale(0.6);
}

.form-input.is-valid ~ .form-checkmark {
  opacity: 1;
  transform: scale(1);
}

/* Password strength bar */
.pw-strength {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  margin-top: var(--space-2);
  overflow: hidden;
}

.pw-strength-fill {
  height: 100%;
  border-radius: 2px;
  width: 0;
  transition: width 300ms ease, background 300ms ease;
}

.pw-strength-fill.weak   { width: 33%;  background: var(--red); }
.pw-strength-fill.medium { width: 66%;  background: var(--amber); }
.pw-strength-fill.strong { width: 100%; background: var(--green-light); }

/* --- Misc Utilities --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex       { display: flex; }
.flex-col   { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

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

/* --- Mobile Base --- */
@media (max-width: 640px) {
  :root {
    --section-pad: 64px;
    font-size: 16px;
  }

  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.7rem; }
  h3 { font-size: 1.3rem; }

  p { font-size: 1rem; }

  .container,
  .container--narrow {
    padding: 0 var(--space-5);
  }

  .btn-primary.btn-full-mobile {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 0.95rem;
  }

  #toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: 80px;
  }

  .toast { width: 100%; }
}