/* ==========================================================================
   COMPONENTES (estilo shadcn: pequenos, compostos por tokens)
   Botão · Header · Card de palestrante (flip) · Campo de formulário · Accordion
   ========================================================================== */

/* ---------- Botão ---------- */
.btn {
  --btn-bg: var(--coral);
  --btn-fg: var(--plum);
  --btn-bg-hover: var(--amber);
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-3);
  padding: 0.95em 1.7em;
  border: 0; border-radius: var(--radius-pill);
  background: var(--btn-bg); color: var(--btn-fg);
  font-family: var(--font-sub); font-weight: 700; font-size: var(--fs-base);
  letter-spacing: 0.02em; text-decoration: none; cursor: pointer;
  position: relative; overflow: hidden; isolation: isolate;
  box-shadow: 0 8px 20px -6px rgb(203 113 105 / 0.55);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), color var(--t);
}
/* preenchimento que "varre" no hover */
.btn::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: var(--btn-bg-hover);
  transform: translateX(-101%);
  transition: transform var(--t) var(--ease);
}
.btn:hover, .btn:focus-visible { transform: translateY(-3px); box-shadow: 0 14px 28px -8px rgb(230 172 84 / 0.6); }
.btn:hover::before, .btn:focus-visible::before { transform: translateX(0); }
.btn:active { transform: translateY(-1px) scale(0.98); }
.btn svg { width: 1.2em; height: 1.2em; transition: transform var(--t) var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn[disabled] { opacity: 0.65; cursor: progress; transform: none; }

.btn--outline {
  --btn-bg: transparent; --btn-fg: var(--cream); --btn-bg-hover: var(--cream);
  box-shadow: inset 0 0 0 2px currentColor;
}
.btn--outline:hover { color: var(--plum); box-shadow: inset 0 0 0 2px var(--cream); }
.btn--sm { padding: 0.65em 1.2em; font-size: var(--fs-sm); }
.btn--lg { padding: 1.1em 2.1em; font-size: var(--fs-lg); }
.btn--sage { --btn-bg: var(--sage); --btn-fg: var(--plum); --btn-bg-hover: var(--cream); box-shadow: 0 8px 20px -6px rgb(139 170 151 / 0.5); }

/* ---------- Header ---------- */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--header-h);
  display: flex; align-items: center;
  transition: background var(--t), box-shadow var(--t), transform var(--t) var(--ease);
}
.header.is-solid { background: rgb(61 13 61 / 0.94); backdrop-filter: blur(10px); box-shadow: var(--shadow); }
.header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5); }
.header__brand { display: flex; align-items: center; gap: var(--sp-3); text-decoration: none; color: var(--cream); font-family: var(--font-sub); font-weight: 700; letter-spacing: 0.04em; }
.header__brand img { width: 2.75rem; height: 2.75rem; object-fit: contain; }
.nav { display: none; align-items: center; gap: var(--sp-6); }
.nav a:not(.btn) {
  color: var(--cream); text-decoration: none; font-weight: 600; font-size: var(--fs-sm);
  position: relative; padding-block: var(--sp-2);
}
.nav a:not(.btn)::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--amber);
  transform: scaleX(0); transform-origin: left; transition: transform var(--t) var(--ease);
}
.nav a:not(.btn):hover::after { transform: scaleX(1); }
.header__cta-mobile { display: inline-flex; }

@media (min-width: 62em) {
  .nav { display: flex; }
  .header__cta-mobile { display: none; }
}

/* ---------- Card de palestrante (frente: foto + título | verso: minibio) ---------- */
.speaker { perspective: 1200px; }
.speaker__btn {
  display: block; width: 100%; aspect-ratio: 4 / 5; padding: 0; border: 0; background: none;
  cursor: pointer; text-align: left; border-radius: var(--radius-lg);
}
.speaker__inner {
  display: block;
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d;
  transition: transform 700ms var(--ease);
  border-radius: var(--radius-lg);
}
.speaker__face {
  position: absolute; inset: 0; border-radius: var(--radius-lg); overflow: hidden;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  box-shadow: var(--shadow);
}
.speaker__front { background: var(--plum-700); }
.speaker__front img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.speaker__front::after { /* degradê para legibilidade do título */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 25%, rgb(42 8 42 / 0.96) 100%);
}
.speaker__caption {
  position: absolute; inset: auto 0 0 0; z-index: 1; padding: var(--sp-5);
  display: grid; gap: var(--sp-2); color: var(--cream);
}
.speaker__name { font-family: var(--font-sub); font-weight: 700; font-size: var(--fs-sm); letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber); }
.speaker__talk { font-family: var(--font-title); font-weight: 800; font-size: clamp(1rem, 0.9rem + 0.5vw, 1.25rem); line-height: 1.2; }
.speaker__hint {
  position: absolute; top: var(--sp-4); right: var(--sp-4); z-index: 2;
  width: 2.5rem; height: 2.5rem; border-radius: 50%; display: grid; place-items: center;
  background: rgb(246 241 241 / 0.92); color: var(--plum);
}
.speaker__hint svg { width: 1.2rem; height: 1.2rem; }

.speaker__back {
  transform: rotateY(180deg);
  background: linear-gradient(160deg, var(--plum-700), var(--plum));
  color: var(--cream); padding: var(--sp-4) var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2);
  overflow-y: auto; scrollbar-width: thin;
  border: 1px solid rgb(230 172 84 / 0.35);
}
.speaker__back .speaker__name { font-size: var(--fs-base); }
.speaker__bio { font-size: 0.84rem; line-height: 1.5; color: rgb(246 241 241 / 0.9); }

/* placeholder "em breve" */
.speaker--pending .speaker__front {
  background: linear-gradient(150deg, var(--plum-700), var(--plum-500));
  display: grid; place-items: center;
}
.speaker--pending .speaker__front::after { display: none; }
.speaker__initials {
  font-family: var(--font-sub); font-weight: 700; font-size: clamp(3rem, 2rem + 4vw, 5rem);
  color: rgb(246 241 241 / 0.22); letter-spacing: 0.04em;
}
.speaker--pending .speaker__caption { inset: auto 0 0 0; }
.speaker--pending .speaker__talk { color: rgb(246 241 241 / 0.7); font-weight: 700; font-size: var(--fs-sm); }

/* Flip: hover (ponteiro fino) ou foco/toque (classe .is-flipped via JS) */
@media (hover: hover) {
  .speaker:hover .speaker__inner { transform: rotateY(180deg); }
}
.speaker.is-flipped .speaker__inner { transform: rotateY(180deg); }
.speaker__btn:focus-visible { outline: 3px solid var(--amber); outline-offset: 4px; }

/* ---------- Campos de formulário ---------- */
.field { display: grid; gap: var(--sp-2); }
.field label { font-family: var(--font-sub); font-weight: 700; font-size: var(--fs-sm); letter-spacing: 0.04em; color: var(--plum); }
.field label .req { color: var(--coral-600); }
.input {
  width: 100%; padding: 1em 1.15em; background: #fff; color: var(--ink);
  border: 2px solid var(--cream-200); border-radius: var(--radius);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.input::placeholder { color: var(--grey); }
.input:hover { border-color: var(--sage); }
.input:focus { outline: none; border-color: var(--coral); box-shadow: 0 0 0 4px rgb(203 113 105 / 0.25); }
.input[aria-invalid="true"] { border-color: #b3261e; }
.field__error { min-height: 1.2em; font-size: var(--fs-xs); font-weight: 600; color: #b3261e; }

/* ---------- Accordion (FAQ) ---------- */
.accordion { display: grid; gap: var(--sp-3); }
.acc-item { background: #fff; border-radius: var(--radius); border: 1px solid var(--cream-200); overflow: hidden; transition: box-shadow var(--t), border-color var(--t); }
.acc-item:hover { box-shadow: var(--shadow-sm); }
.acc-item.is-open { border-color: var(--coral); box-shadow: var(--shadow); }
.acc-trigger {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4);
  padding: var(--sp-5); background: none; border: 0; cursor: pointer; text-align: left;
  font-family: var(--font-sub); font-weight: 700; font-size: var(--fs-lg); color: var(--plum);
}
.acc-trigger svg { flex: none; width: 1.5rem; height: 1.5rem; color: var(--coral); transition: transform var(--t) var(--ease); }
.acc-item.is-open .acc-trigger svg { transform: rotate(45deg); }
.acc-panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows var(--t) var(--ease); }
.acc-item.is-open .acc-panel { grid-template-rows: 1fr; }
.acc-panel > div { overflow: hidden; }
.acc-panel p { padding: 0 var(--sp-5) var(--sp-5); color: var(--text-soft); }

/* Ajustes mobile do header */
.header__brand span, .btn { white-space: nowrap; }
@media (max-width: 30em) { .header__brand span { font-size: 0.8125rem; } .header__brand img { width: 2.25rem; height: 2.25rem; } }