/* ==========================================================================
   RepTap core design system
   Dark-first. Restrained. Built for a phone held mid-set.
   ========================================================================== */

:root {
  /* Base palette ------------------------------------------------------- */
  --carbon:    #0A0B0D;
  --graphite:  #14161A;
  --steel:     #272A31;
  --chalk:     #F5F6F7;
  --ash:       #9398A3;
  --signal:    #8CFF5A;

  /* Semantic surfaces --------------------------------------------------- */
  --bg:            var(--carbon);
  --surface:       var(--graphite);
  --surface-2:     #191C21;
  --surface-hover: #1E2127;
  --border:        var(--steel);
  --border-soft:   #1E2126;
  /* Form controls can be empty, so their boundary must be perceivable:
     WCAG 1.4.11 wants 3:1. Decorative separators keep --border. */
  --border-input:  #5C6374;
  --border-hover:  #33373F;   /* card/button edge on hover */
  --input-hover:   #737A8B;   /* form-control edge on hover */
  --accent-hover:  #9BFF70;
  --toast-bg:      #1C1F25;
  --text:          var(--chalk);
  --text-muted:    var(--ash);
  --text-faint:    #7E848F;   /* AA on every surface it sits on */
  --accent:        var(--signal);
  --accent-ink:    #06210A;   /* text on accent fills */
  --accent-soft:   rgba(140, 255, 90, 0.12);
  --accent-line:   rgba(140, 255, 90, 0.35);

  --danger:      #FF6B5A;
  --danger-soft: rgba(255, 107, 90, 0.12);
  --warn:        #FFC857;

  /* Type ---------------------------------------------------------------- */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-num: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --t-xs:  0.75rem;    /* 12 */
  --t-sm:  0.8125rem;  /* 13 */
  --t-base:0.875rem;   /* 14 */
  --t-md:  1rem;       /* 16 */
  --t-lg:  1.125rem;   /* 18 */
  --t-xl:  1.3125rem;  /* 21 */
  --t-2xl: 1.625rem;   /* 26 */
  --t-3xl: 2rem;       /* 32 */
  --t-4xl: 2.75rem;    /* 44 */
  --t-5xl: 3.5rem;     /* 56 */

  /* Space --------------------------------------------------------------- */
  --s-1: 4px;   --s-2: 8px;   --s-3: 12px;  --s-4: 16px;
  --s-5: 20px;  --s-6: 24px;  --s-8: 32px;  --s-10: 40px;
  --s-12: 48px; --s-16: 64px; --s-20: 80px; --s-24: 96px;

  --r-sm: 6px;  --r-md: 10px;  --r-lg: 14px;  --r-xl: 20px;  --r-full: 999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,.35);
  --shadow-lg: 0 24px 60px rgba(0,0,0,.55);

  --dur: 180ms;
  --dur-slow: 280ms;
  --ease: cubic-bezier(.22,.61,.36,1);

  --max: 1120px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--t-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.12;
  letter-spacing: -0.022em;
  font-weight: 600;
}
h1 { font-size: var(--t-4xl); letter-spacing: -0.032em; }
h2 { font-size: var(--t-2xl); letter-spacing: -0.026em; }
h3 { font-size: var(--t-lg); }
p  { margin: 0; }

a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; display: block; }

button, input, select, textarea {
  font: inherit;
  color: inherit;
  margin: 0;
}

/* Numbers that must line up: weight, reps, time, speed, analytics. */
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ------------------------------------------------------------- a11y */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}
:focus:not(:focus-visible) { outline: none; }

.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;
}

.skip-link {
  position: absolute; left: var(--s-4); top: -60px; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: var(--s-3) var(--s-4); border-radius: var(--r-md);
  font-weight: 600; transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--s-4); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------------- layout */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--s-6); }
.stack > * + * { margin-top: var(--gap, var(--s-4)); }

/* ---------------------------------------------------------- buttons */
.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--text);
  --btn-bd: var(--border);
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  padding: 0 var(--s-4);
  min-height: 40px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--r-md);
  font-size: var(--t-base);
  font-weight: 550;
  letter-spacing: -0.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.btn:hover:not(:disabled) { background: var(--surface-hover); border-color: var(--border-hover); }
.btn:active:not(:disabled) { transform: scale(0.985); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  --btn-bg: var(--accent);
  --btn-fg: var(--accent-ink);
  --btn-bd: var(--accent);
  font-weight: 600;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-ghost { --btn-bg: transparent; --btn-bd: transparent; color: var(--text-muted); }
.btn-ghost:hover:not(:disabled) { background: var(--surface); color: var(--text); border-color: transparent; }

.btn-danger { --btn-bg: transparent; --btn-fg: var(--danger); --btn-bd: rgba(255,107,90,.35); }
.btn-danger:hover:not(:disabled) { background: var(--danger-soft); border-color: var(--danger); }

.btn-lg { min-height: 48px; padding: 0 var(--s-6); font-size: var(--t-md); }
.btn-sm { min-height: 32px; padding: 0 var(--s-3); font-size: var(--t-sm); }
/* A full-width button may wrap its label. Keeping nowrap here set a minimum
   width that pushed narrow layouts into horizontal scroll. */
.btn-block {
  width: 100%;
  white-space: normal;
  padding-block: var(--s-2);
  text-align: center;
  line-height: 1.25;
}

/* ----------------------------------------------------------- inputs */
.field { display: block; }
.field + .field { margin-top: var(--s-4); }
.label {
  display: block;
  font-size: var(--t-sm);
  font-weight: 550;
  color: var(--text-muted);
  margin-bottom: var(--s-2);
  letter-spacing: -0.005em;
}
.input, .select, .textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--s-3) var(--s-4);
  background: var(--surface);
  border: 1px solid var(--border-input);
  border-radius: var(--r-md);
  color: var(--text);
  font-size: var(--t-md);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--text-faint); }
.input:hover, .select:hover, .textarea:hover { border-color: var(--input-hover); }
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.textarea { min-height: 120px; resize: vertical; line-height: 1.5; }
.select { appearance: none; padding-right: var(--s-10);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%239398A3' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right var(--s-4) center;
}
.input[aria-invalid="true"], .textarea[aria-invalid="true"], .select[aria-invalid="true"] {
  border-color: var(--danger);
}
.hint { font-size: var(--t-sm); color: var(--text-faint); margin-top: var(--s-2); }
/* Error text carries an icon so it never depends on colour alone. */
.error-text {
  display: flex; align-items: flex-start; gap: var(--s-2);
  font-size: var(--t-sm); color: var(--danger); margin-top: var(--s-2);
}
.error-text::before { content: "!"; flex: none;
  width: 15px; height: 15px; margin-top: 2px; border-radius: 50%;
  background: var(--danger); color: #1a0603;
  font-size: 11px; font-weight: 700; line-height: 15px; text-align: center;
}

/* ------------------------------------------------------------ cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: var(--s-6);
}

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px;
  border-radius: var(--r-full);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.01em;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border-soft);
  white-space: nowrap;
}
.badge-active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-line); }
.badge-muted  { background: transparent; }
.badge-danger { background: var(--danger-soft); color: var(--danger); border-color: rgba(255,107,90,.3); }
.badge-dot::before { content:""; width:6px; height:6px; border-radius:50%; background: currentColor; }

.eyebrow {
  font-size: var(--t-xs);
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.muted { color: var(--text-muted); }
.faint { color: var(--text-faint); }

/* ----------------------------------------------------------- toasts */
.toasts {
  position: fixed; left: 50%; bottom: var(--s-6); transform: translateX(-50%);
  z-index: 90; display: flex; flex-direction: column; gap: var(--s-2);
  pointer-events: none; width: min(420px, calc(100vw - 32px));
}
.toast {
  display: flex; align-items: center; gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  background: var(--toast-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  font-size: var(--t-base);
  animation: toast-in var(--dur-slow) var(--ease);
}
.toast-good { border-color: var(--accent-line); }
.toast-bad  { border-color: rgba(255,107,90,.4); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px) scale(.97); }
  to   { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------- dialogs */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 80;
  background: rgba(6,7,9,.72);
  backdrop-filter: blur(3px);
  display: grid; place-items: center;
  padding: var(--s-4);
  animation: fade-in var(--dur) var(--ease);
}
.modal {
  width: min(520px, 100%);
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--s-6);
  animation: modal-in var(--dur-slow) var(--ease);
}
@keyframes fade-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(10px) scale(.985); }
  to   { opacity: 1; transform: none; }
}

/* --------------------------------------------------------- spinner */
.spinner {
  width: 15px; height: 15px; flex: none;
  border: 2px solid rgba(255,255,255,.22);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg) } }

/* ------------------------------------------------------ empty state */
.empty {
  text-align: center;
  padding: var(--s-12) var(--s-6);
  color: var(--text-muted);
}
.empty h3 { color: var(--text); margin-bottom: var(--s-2); }

.divider { height: 1px; background: var(--border-soft); border: 0; margin: var(--s-6) 0; }