/* ==========================================================================
   SmartSenior Kiosk — base styles (Apple light theme, touch-first)
   ========================================================================== */

:root {
  --color-bg:          #F5F5F7;
  --color-bg-elevated: #FFFFFF;
  --color-bg-card:     #FFFFFF;
  --color-border:      #D2D2D7;
  --color-text:        #1D1D1F;
  --color-text-muted:  #6E6E73;
  --color-accent:      #0071E3;
  --color-accent-dark: #0077ED;
  --color-danger:      #FF3B30;
  --color-success:     #34C759;

  --radius:    14px;
  --radius-lg: 20px;
  --tap-min:   64px;
  --font-base: 18px;

  --shadow:      0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.06);

  /* Japanese-first font stack */
  --font-stack: -apple-system, BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Yu Gothic Medium", "Noto Sans JP",
    "Segoe UI", sans-serif;
  --font-serif: -apple-system, BlinkMacSystemFont,
    "Hiragino Mincho ProN", "Yu Mincho",
    "Noto Serif JP", Georgia, serif;
}

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

html, body { margin: 0; padding: 0; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-stack);
  font-size: var(--font-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.4em;
  letter-spacing: -0.3px;
}

h1 { font-size: 2.6rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.3rem; }

p { margin: 0 0 1em; }

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

/* ---- Buttons -------------------------------------------------------------- */

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: var(--tap-min);
  min-width: var(--tap-min);
  padding: 0 1.6em;
  font-family: var(--font-stack);
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.12s ease, transform 0.08s ease, opacity 0.12s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

button:hover, .btn:hover   { background-color: var(--color-accent-dark); }
button:active, .btn:active { transform: scale(0.97); }
button:disabled, .btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-secondary {
  color: var(--color-text);
  background-color: transparent;
  border: 1.5px solid var(--color-border);
}
.btn-secondary:hover { background-color: rgba(0, 0, 0, 0.04); }

.btn-danger { background-color: var(--color-danger); color: #fff; }
.btn-danger:hover { background-color: #D93025; }

/* ---- Form fields ---------------------------------------------------------- */

input, textarea, select {
  width: 100%;
  min-height: var(--tap-min);
  padding: 0 16px;
  font-family: var(--font-stack);
  font-size: 1.1rem;
  color: var(--color-text);
  background-color: #fff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus, textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

input::placeholder, textarea::placeholder { color: #AEAEB2; }

/* ---- Cards ---------------------------------------------------------------- */

.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 24px;
}

/* ---- Utilities ------------------------------------------------------------- */

.center  { text-align: center; }
.muted   { color: var(--color-text-muted); }
.hidden  { display: none !important; }
.stack > * + * { margin-top: 16px; }

/* ---- Spinner --------------------------------------------------------------- */

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
  margin: 24px auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}