/* ==========================================================================
   Desk Reset Timer — theme.css
   Site: desk-reset-timer.hekatix.com
   Identity: Dark-mode minimalist, high-contrast, clean visual timer for desk workers.
   Cyan-primary palette on deep charcoal field with green/warn colors for states.
   Every color/font/spacing/radius/shadow is a custom property on :root.
   ========================================================================== */

:root {
  /* ---- color ---------------------------------------------------------- */
  --color-bg:        #0d0f11;   /* deep charcoal background */
  --color-surface:   #1a1d21;   /* raised panels */
  --color-surface-2: #24282e;   /* active states, secondary panels */
  --color-ink:       #e8ecf0;   /* body text */
  --color-ink-head:  #ffffff;   /* headings */
  --color-muted:     #8b939d;   /* secondary text, captions */
  --color-accent:    #4cc9f0;   /* primary cyan */
  --color-accent-dk: #3aa0c7;   /* hover/active */
  --color-accent-on: #0d0f11;   /* text on accent */
  --color-safe:      #2ecc71;   /* safe/completed state */
  --color-warn:      #f39c12;   /* warning/alert */
  --color-danger:    #e74c3c;   /* stop/pain critical */
  --color-border:    #2e343b;   /* hairline dividers */
  --color-focus:     #4cc9f0;   /* visible focus ring */
  --color-shadow:    rgba(0, 0, 0, 0.35);

  /* ---- type ----------------------------------------------------------- */
  --font-body:    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
                  Arial, sans-serif;
  --font-heading: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
                  Arial, sans-serif;
  --font-mono:    ui-monospace, "SFMono-Regular", Menlo, Consolas,
                  "Liberation Mono", monospace;

  --text-xs:  0.75rem;
  --text-sm:  0.875rem;
  --text-md:  1rem;
  --text-lg:  1.25rem;
  --text-xl:  1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.5rem;

  --leading-body: 1.6;
  --leading-head: 1.15;
  --tracking-tight: -0.01em;
  --measure: 68ch;

  /* ---- spacing (8px scale, mobile-first) ------------------------------ */
  --space-1: 0.25rem;  /*   4px */
  --space-2: 0.5rem;   /*   8px */
  --space-3: 0.75rem;  /*  12px */
  --space-4: 1rem;     /*  16px */
  --space-5: 1.5rem;   /*  24px */
  --space-6: 2rem;     /*  32px */
  --space-7: 3rem;     /*  48px */
  --space-8: 4rem;     /*  64px */
  --space-9: 6rem;     /*  96px */

  /* ---- radius --------------------------------------------------------- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* ---- shadow --------------------------------------------------------- */
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 8px 24px var(--color-shadow);
  --shadow-lg: 0 16px 48px var(--color-shadow);

  /* ---- layout --------------------------------------------------------- */
  --wrap: 720px;
  --gutter: clamp(1rem, 5vw, 2rem);
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-accent); text-decoration: none;
    text-underline-offset: 0.14em; text-decoration-thickness: 1px; }
a:hover { color: var(--color-accent-dk); text-decoration: underline; }
a:visited { color: var(--color-accent); }

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
}

:root {
  --focus-ring: 3px solid var(--color-focus);
  --focus-offset: 2px;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Skip link for keyboard users
   ========================================================================== */
.skip-link {
  position: absolute; left: var(--space-4); top: -100%;
  background: var(--color-accent); color: var(--color-accent-on);
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-md);
  z-index: 100; font-weight: 700; text-decoration: none;
}
.skip-link:focus { top: var(--space-2); }

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-ink-head);
  line-height: var(--leading-head);
  letter-spacing: var(--tracking-tight);
  font-weight: 700;
  margin: 0 0 var(--space-4);
  text-wrap: balance;
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); margin-top: var(--space-7); }
h3 { font-size: var(--text-lg); margin-top: var(--space-5); }
h4 { font-size: var(--text-md); margin-top: var(--space-4); }

p { margin: 0 0 var(--space-5); max-width: var(--measure); }

ul, ol { margin: 0 0 var(--space-5); padding-left: 1.4em; max-width: var(--measure); }
li { margin-bottom: var(--space-2); }

strong, b { color: var(--color-ink-head); font-weight: 700; }
em, i { font-style: italic; }

blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-5) var(--space-6);
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-ink);
}
blockquote > *:last-child { margin-bottom: 0; }

hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--space-7) 0; }

/* ==========================================================================
   Site header
   ========================================================================== */
header.site {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 50;
  box-shadow: var(--shadow-sm);
}

nav.top {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 4rem;
  display: flex; align-items: center; gap: var(--space-5);
}

.wordmark {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-ink-head);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: var(--space-2);
  white-space: nowrap;
}
.wordmark:hover { color: var(--color-accent); text-decoration: none; }

nav.top ul {
  display: flex; gap: var(--space-4); margin: 0; padding: 0;
  list-style: none; margin-left: auto;
}
nav.top li { margin: 0; }
nav.top a {
  text-decoration: none; color: var(--color-muted);
  font-weight: 600; font-size: var(--text-sm);
  padding: var(--space-2) var(--space-1);
  border-radius: var(--radius-sm);
}
nav.top a:hover { color: var(--color-accent); text-decoration: underline; }
nav.top a[aria-current="page"] { color: var(--color-accent); background: var(--color-surface-2); }

/* ==========================================================================
   Main container
   ========================================================================== */
main.main {
  min-height: calc(100vh - 160px);
  padding: var(--space-6) var(--gutter) var(--space-8);
}

.container {
  max-width: var(--wrap);
  margin: 0 auto;
}

/* ==========================================================================
   Hero section
   ========================================================================== */
.hero {
  text-align: center;
  padding: var(--space-8) 0 var(--space-7);
}

.hero h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--color-ink-head), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p.lead {
  font-size: var(--text-lg);
  color: var(--color-muted);
  margin: 0 auto var(--space-6);
  max-width: 560px;
}

.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-accent); color: var(--color-accent-on);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.08s ease;
}
.btn-primary:hover { background: var(--color-accent-dk); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--color-bg), 0 0 0 6px var(--color-accent); }

/* ==========================================================================
   Timer display
   ========================================================================== */
.timer-display {
  display: flex; flex-direction: column; align-items: center; gap: var(--space-6);
  padding: var(--space-7) 0;
}

.timer-svg {
  width: 240px; height: 240px;
  transform: rotate(-90deg);
}

.timer-ring {
  fill: none; stroke: var(--color-surface-2);
  stroke-width: 12; stroke-linecap: round;
}

.timer-progress {
  fill: none; stroke: var(--color-accent);
  stroke-width: 12; stroke-linecap: round;
  stroke-dasharray: 628;  /* 2 * PI * 100 */
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
}

.timer-number {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-ink-head);
  font-variant-numeric: tabular-nums;
}

.timer-label {
  font-size: var(--text-sm);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
}

.exercise-title {
  font-size: var(--text-2xl);
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.exercise-steps {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: 0;
}
.exercise-steps h3 {
  margin-top: 0; color: var(--color-ink-head);
}
.exercise-steps ol {
  padding-left: 1.6em;
  margin: 0;
}
.exercise-steps li {
  margin-bottom: var(--space-3);
  color: var(--color-muted);
}

/* ==========================================================================
   Exercise display container
   ========================================================================== */
.exercise-display {
  margin: var(--space-7) 0;
}

/* ==========================================================================
   Safety controls
   ========================================================================== */
.safety-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-7) 0;
}

.safety-panel h2 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  color: var(--color-ink-head);
}

.safety-toggles {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
}

.toggle-label {
  display: inline-flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.toggle-label:hover { border-color: var(--color-accent-dk); }
.toggle-label[data-state="on"] {
  border-color: var(--color-accent);
  background: rgba(76, 201, 240, 0.1);
}
.toggle-label input {
  position: absolute; opacity: 0; pointer-events: none;
}

.toggle-indicator {
  width: 20px; height: 20px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-muted);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.toggle-label[data-state="on"] .toggle-indicator {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.toggle-text {
  font-weight: 600; color: var(--color-ink);
}
.toggle-label[data-state="on"] .toggle-text {
  color: var(--color-accent);
}

.safety-banner {
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-muted);
  display: flex; align-items: center; gap: var(--space-3);
}
.safety-banner svg { flex: 0 0 auto; width: 18px; height: 18px; }
.safety-banner span { font-weight: 600; color: var(--color-ink-head); }

/* ==========================================================================
   Exercise list (planning phase)
   ========================================================================== */
.routine-section {
  margin: var(--space-7) 0;
}

.routine-preview {
  display: grid; gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 560px) {
  .routine-preview { grid-template-columns: repeat(3, 1fr); }
}

.exercise-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.exercise-card h3 {
  margin: 0 0 var(--space-2); color: var(--color-ink-head);
  font-size: var(--text-lg);
}
.exercise-card p {
  margin: 0 0 var(--space-3); color: var(--color-muted); font-size: var(--text-sm);
}
.exercise-card .duration {
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--color-muted);
  font-weight: 600;
}

/* ==========================================================================
   Controls (overlay style)
   ========================================================================== */
.controls-area {
  display: flex; justify-content: center; gap: var(--space-4);
  margin-top: var(--space-7);
}

.btn-control {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-surface-2);
  color: var(--color-ink-head);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: background 0.15s ease, transform 0.08s ease;
  min-width: 88px;
}
.btn-control:hover { background: var(--color-accent-dk); }
.btn-control:active { transform: translateY(1px); }
.btn-control svg { margin-right: var(--space-2); width: 20px; height: 20px; }

.btn-skip {
  background: var(--color-warn);
  color: #0d0f11;
}
.btn-skip:hover { background: #e67e22; }
.btn-skip:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--color-bg), 0 0 0 6px var(--color-warn); }

.btn-pause { background: var(--color-surface-2); }
.btn-pause:hover { background: var(--color-accent-dk); }
.btn-pause svg { width: 22px; height: 22px; }
.btn-pause.playing .icon-pause { display: none; }
.btn-pause.paused .icon-play { display: none; }

.btn-resume { background: var(--color-accent); color: var(--color-accent-on); }
.btn-resume:hover { background: var(--color-accent-dk); }

/* ==========================================================================
   Safety modal
   ========================================================================== */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-4);
  z-index: 200;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-backdrop.active { opacity: 1; pointer-events: auto; }

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 560px; width: 100%;
  max-height: 90vh; overflow-y: auto;
  box-shadow: var(--shadow-lg);
  padding: var(--space-7);
}
.modal header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4); border-bottom: 1px solid var(--color-border);
}
.modal h2 { font-size: var(--text-2xl); margin: 0; color: var(--color-ink-head); }
.modal-close {
  background: none; border: none; color: var(--color-muted);
  font-size: var(--text-xl); cursor: pointer; padding: var(--space-2);
}
.modal-close:hover { color: var(--color-ink-head); }

.modal-content h3 { font-size: var(--text-lg); color: var(--color-ink-head); }
.modal-content p { color: var(--color-muted); }

.modal-footer {
  margin-top: var(--space-6);
  display: flex; justify-content: flex-end; gap: var(--space-4);
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) var(--gutter) var(--space-7);
  font-size: var(--text-sm);
  color: var(--color-muted);
  text-align: center;
}
footer.site-footer .inner { max-width: var(--wrap); margin: 0 auto; }
footer.site-footer p { max-width: var(--measure); margin: var(--space-3) 0; }

/* ==========================================================================
   Messages
   ========================================================================== */
.message-box {
  background: var(--color-surface-2);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  margin: var(--space-7) 0;
}
.message-box.info { border-left: 4px solid var(--color-accent); }
.message-box.success { border-left: 4px solid var(--color-safe); }
.message-box.warning { border-left: 4px solid var(--color-warn); }
.message-box.danger { border-left: 4px solid var(--color-danger); }

.message-title { font-weight: 700; color: var(--color-ink-head); margin-bottom: var(--space-2); }
.message-body { color: var(--color-muted); }

/* ==========================================================================
   Motion — respect reduced preference
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .timer-progress { transition: none; }
}

/* ==========================================================================
   Dark mode — token overrides only (already default, but explicit)
   ========================================================================== */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg:        #0d0f11;
    --color-surface:   #1a1d21;
    --color-surface-2: #24282e;
    --color-ink:       #e8ecf0;
    --color-ink-head:  #ffffff;
    --color-muted:     #8b939d;
    --color-accent:    #4cc9f0;
    --color-accent-dk: #3aa0c7;
    --color-accent-on: #0d0f11;
    --color-safe:      #2ecc71;
    --color-warn:      #f39c12;
    --color-danger:    #e74c3c;
    --color-border:    #2e343b;
    --color-shadow:    rgba(0, 0, 0, 0.35);
  }
}