/* ==========================================================================
   Thinkneering — Global Design Tokens & Base Styles
   Shared across every page. Do not duplicate these values inline.
   ========================================================================== */

:root {
  /* Color */
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-primary: #2f5fff;
  --color-primary-dark: #1e3fcc;
  --color-accent: #00c2a8;
  --color-text: #14161a;
  --color-text-muted: #5c6270;
  --color-border: #e3e5ea;
  --color-success: #1fa971;
  --color-warning: #e0a100;
  --color-danger: #e0432f;

  /* Typography */
  --font-heading: 'Sora', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing (8px base scale) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;

  /* Radius & shadow */
  --radius-sm: 6px;
  --radius-md: 12px;
  --shadow-card: 0 2px 8px rgba(20, 22, 26, 0.06);

  /* Layout */
  --content-max: 1100px;
}

/* -------------------------------------------------------------------------
   Reset
   ------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  margin: 0 0 var(--space-2);
  line-height: 1.25;
}

p {
  margin: 0 0 var(--space-3);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
}

/* -------------------------------------------------------------------------
   Layout
   ------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* -------------------------------------------------------------------------
   Focus states — accessibility, not optional
   ------------------------------------------------------------------------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* -------------------------------------------------------------------------
   Shared components
   ------------------------------------------------------------------------- */

/* Card */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-primary:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-bg);
  border-color: var(--color-text-muted);
}

.btn-block {
  width: 100%;
}

/* Form fields */
.field {
  margin-bottom: var(--space-4);
}

.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.field input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.field input::placeholder {
  color: var(--color-text-muted);
}

.field input:focus {
  border-color: var(--color-primary);
}

.field-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.field-error {
  font-size: 13px;
  color: var(--color-danger);
  margin-top: var(--space-2);
  display: none;
}

.field.has-error input {
  border-color: var(--color-danger);
}

.field.has-error .field-error {
  display: block;
}

/* Utility text */
.text-muted {
  color: var(--color-text-muted);
}

.text-mono {
  font-family: var(--font-mono);
}

/* Visually hidden but accessible to screen readers */
.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;
}



/* -------------------------------------------------------------------------
   Dark theme — activated via [data-theme="dark"] on <html>
   ------------------------------------------------------------------------- */
[data-theme="dark"] {
  --color-bg: #0f1115;
  --color-surface: #181b21;
  --color-primary: #6f8dff;
  --color-primary-dark: #4d70ff;
  --color-accent: #00e0c0;
  --color-text: #f3f4f6;
  --color-text-muted: #9aa0ac;
  --color-border: #2a2e37;
  --color-success: #35c98a;
  --color-warning: #f0b429;
  --color-danger: #ff6b5a;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* Smooth transition when switching themes */
body, .card, .field input, .btn {
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

/* Theme toggle button */
.theme-toggle {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  color: var(--color-text);
  cursor: pointer;
  z-index: 100;
}

.theme-toggle:hover {
  border-color: var(--color-text-muted);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}