/* ============================================================
   SHARED STYLES — Design Tokens, Reset, Components
   Page-specific styles are in home.css, members.css, lesson.css, auth.css
   ============================================================ */

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --color-primary:        #390517;
  --color-primary-dark:   #250310;
  --color-primary-hover:  #4a0820;
  --color-primary-light:  #f9f0f3;
  --color-accent:         #866b48;
  --color-accent-dark:    #8a6f4f;
  --color-accent-light:   #f7f1e9;
  --color-bg:             #ffffff;
  --color-surface:        #ffffff;
  --color-card:           #ffffff;
  --color-muted:          #f5f5f5;
  --color-border:         #e0e0e0;
  --color-border-strong:  #c8c8c8;
  --color-text:           #1a0a0e;
  --color-text-muted:     #6b6b6b;
  --color-text-on-primary: #ffffff;
  --color-success:        #166534;
  --color-success-light:  #dcfce7;
  --color-warning:        #92400e;
  --color-warning-light:  #fef3c7;
  --color-danger:         #991b1b;
  --color-danger-light:   #fee2e2;
  --color-info:           #1e3a8a;
  --color-info-light:     #dbeafe;
  --font: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --space-1: 4px;   --space-2: 8px;   --space-3: 12px;
  --space-4: 16px;  --space-5: 20px;  --space-6: 24px;
  --space-8: 32px;  --space-10: 40px; --space-12: 48px;
  --space-16: 64px;
  --radius-sm:   4px;
  --radius:      8px;
  --radius-lg:   12px;
  --radius-xl:   20px;
  --radius-full: 9999px;
  --shadow-xs: 0 1px 2px rgba(57,5,23,.06);
  --shadow-sm: 0 2px 6px rgba(57,5,23,.07), 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 4px 14px rgba(57,5,23,.09), 0 2px 4px rgba(0,0,0,.05);
  --shadow-md: 0 8px 24px rgba(57,5,23,.11), 0 3px 6px rgba(0,0,0,.06);
  --shadow-lg: 0 16px 40px rgba(57,5,23,.12), 0 6px 12px rgba(0,0,0,.07);
  --shadow-card-hover: 0 10px 28px rgba(57,5,23,.15), 0 4px 8px rgba(0,0,0,.06);
  --transition-fast:  .12s ease-out;
  --transition:       .20s ease-out;
  --transition-enter: .22s cubic-bezier(.22,1,.36,1);
  --transition-exit:  .15s cubic-bezier(.55,0,1,.45);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overscroll-behavior-y: none; overscroll-behavior-x: contain; }
body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; cursor: pointer; transition: color var(--transition-fast); }
a:hover { text-decoration: underline; color: var(--color-primary-hover); }
img, video, audio, iframe { max-width: 100%; display: block; }
h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 800; line-height: 1.15; letter-spacing: -.025em; color: var(--color-primary); }
h2 { font-size: clamp(1.2rem, 3vw, 1.6rem); font-weight: 700; line-height: 1.25; letter-spacing: -.015em; color: var(--color-primary); }
h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.35; color: var(--color-primary); }

/* ── Skip link ── */
.skip-link { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; background: var(--color-primary); color: #fff; padding: .5rem 1.5rem; border-radius: 0 0 var(--radius) var(--radius); font-size: .85rem; font-weight: 600; font-family: var(--font); z-index: 9999; text-decoration: none; }
.skip-link:focus { position: fixed; top: 0; left: 50%; transform: translateX(-50%); width: auto; height: auto; overflow: visible; clip: auto; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

.fade-in { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   LAYOUT
   ============================================================ */
.container { max-width: 1160px; margin: 0 auto; padding: 0 var(--space-6); }

/* ============================================================
   LOGO (shared across pages)
   ============================================================ */
.logo { display: flex; align-items: center; gap: var(--space-2); font-size: 1.5625rem; color: var(--color-accent); text-decoration: none; cursor: pointer; font-weight: 700; transition: opacity var(--transition-fast); }
.logo:hover { opacity: .75; text-decoration: none; color: var(--color-accent); }
.logo-icon { font-size: 1.35rem; }
.logo strong { color: var(--color-accent); }

/* ============================================================
   TOPIC GRID (shared between home and members)
   ============================================================ */
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-5); }
.topic-card { min-width: 0; }
@media (max-width: 768px) { .topic-grid { gap: var(--space-3); grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); } }
@media (max-width: 480px) { .container { padding: 0 var(--space-4); } .topic-grid { gap: var(--space-4); grid-template-columns: repeat(2, 1fr); } }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); padding: .6rem 1.4rem; border-radius: var(--radius); font-family: var(--font); font-size: .9rem; font-weight: 600; cursor: pointer; border: 2px solid transparent; transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition-fast); text-decoration: none; user-select: none; -webkit-tap-highlight-color: transparent; min-height: 44px; }
.btn:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 3px; }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none !important; }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); box-shadow: 0 2px 8px rgba(57,5,23,.25); }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); border-color: var(--color-primary-hover); box-shadow: 0 4px 16px rgba(57,5,23,.35); transform: translateY(-1px); text-decoration: none; color: #fff; }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-accent { background: var(--color-accent); color: #fff; border-color: var(--color-accent); box-shadow: 0 2px 8px rgba(163,133,96,.25); }
.btn-accent:hover:not(:disabled) { background: var(--color-accent-dark); border-color: var(--color-accent-dark); box-shadow: 0 4px 14px rgba(163,133,96,.35); transform: translateY(-1px); text-decoration: none; color: #fff; }
.btn-ghost { background: transparent; color: var(--color-text); border-color: var(--color-border-strong); }
.btn-ghost:hover:not(:disabled) { background: var(--color-muted); text-decoration: none; }
.btn-ghost-light { background: transparent; color: rgba(255,255,255,.85); border-color: rgba(255,255,255,.3); }
.btn-ghost-light:hover:not(:disabled) { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.5); text-decoration: none; }
.btn-danger { background: var(--color-danger); color: #fff; border-color: var(--color-danger); }
.btn-danger:hover:not(:disabled) { background: #7f1d1d; transform: translateY(-1px); }
.btn-lg { padding: .8rem 2.2rem; font-size: 1rem; min-height: 52px; border-radius: var(--radius-lg); }
.btn-sm { padding: .4rem .9rem; font-size: .82rem; min-height: 44px; }
.btn-xs { padding: .22rem .6rem; font-size: .76rem; min-height: 30px; }
.btn-full { width: 100%; }
.link-btn { background: none; border: none; cursor: pointer; color: var(--color-primary); font-family: var(--font); font-weight: 500; font-size: .9rem; text-decoration: underline; padding: 0; transition: color var(--transition-fast); }
.link-btn:hover { color: var(--color-primary-hover); }

/* ============================================================
   ALERTS
   ============================================================ */
.alert { padding: .8rem 1rem; border-radius: var(--radius); font-size: .88rem; margin-bottom: var(--space-4); border-left: 4px solid transparent; animation: alertEnter var(--transition-enter) both; }
@keyframes alertEnter { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }
.alert-error   { background: var(--color-danger-light);  color: #7f1d1d; border-left-color: var(--color-danger); }
.alert-success { background: var(--color-success-light); color: #14532d; border-left-color: var(--color-success); }
.alert-info    { background: var(--color-info-light);    color: #1e3a8a; border-left-color: var(--color-info); }
.alert-warning { background: var(--color-warning-light); color: #78350f; border-left-color: var(--color-warning); }

/* ============================================================
   FORMS
   ============================================================ */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-4); }
.form-group label { font-size: .78rem; font-weight: 700; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .07em; }
.form-group input, .form-group select, .form-group textarea { padding: .65rem 1rem; border: 1.5px solid var(--color-border); border-radius: var(--radius); font-family: var(--font); font-size: .95rem; background: var(--color-surface); color: var(--color-text); transition: border-color var(--transition), box-shadow var(--transition); min-height: 44px; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(57,5,23,.12); }
.form-group input::placeholder, .form-group textarea::placeholder { color: #aaa; }
.form-group textarea { resize: vertical; min-height: 80px; }
.form-check { flex-direction: row; align-items: center; }
.check-label { display: flex; align-items: center; gap: var(--space-2); cursor: pointer; font-size: .95rem; font-weight: 500 !important; text-transform: none !important; color: var(--color-text) !important; letter-spacing: 0 !important; }
.check-label input[type="checkbox"] { width: 1.1rem; height: 1.1rem; cursor: pointer; accent-color: var(--color-primary); }
.required { color: var(--color-danger); margin-left: 2px; }
.hint { font-weight: 400; color: var(--color-text-muted); font-size: .78rem; }


/* ── Visibility helpers ── */
.desktop-only { display: none; }
@media (min-width: 640px) { .desktop-only { display: inline; } }
.mobile-only  { display: inline; }
@media (min-width: 640px) { .mobile-only  { display: none; } }