/* ==========================================================
   VARIÁVEIS DE COR — Tema Escuro (Padrão)
   ========================================================== */
:root {
    --bg: #0a0a0f;
    --bg-2: #12121a;
    --bg-card: #1a1a28;
    --border: rgba(255, 255, 255, 0.08);
    --text: #e8e8f0;
    --text-muted: #888899;
    --grad-primary: linear-gradient(135deg, #6c63ff 0%, #ff6584 50%, #ffa94d 100%);
    --grad-hero: linear-gradient(135deg, #0a0a0f 0%, #1a0a2e 50%, #0a1a1f 100%);
    --header-bg: rgba(10, 10, 15, 0.9);
    --menu-bg: rgba(10, 10, 15, 0.95);
    --header-height: 72px;
}

/* Override — Tema Claro */
html.light {
    --bg: #f8fafc;
    --bg-2: #f1f5f9;
    --bg-card: #ffffff;
    --border: rgba(0, 0, 0, 0.1);
    --text: #0f172a;
    --text-muted: #64748b;
    --grad-hero: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f1f5f9 100%);
    --header-bg: rgba(248, 250, 252, 0.9);
    --menu-bg: rgba(248, 250, 252, 0.95);
}

.border-custom {
    border-color: var(--border);
}

.text-gradient {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-backdrop {
    background-color: var(--header-bg);
}

.menu-backdrop {
    background-color: var(--menu-bg);
}

/* ==========================================================
   NAVEGAÇÃO SUAVE — scroll com folga para o header fixo
   ========================================================== */
html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

section[id] {
    scroll-margin-top: var(--header-height);
}

/* ==========================================================
   HEADER — permanece sempre fixo e visível
   ========================================================== */
#site-header {
    transition: background-color 0.3s ease;
}

/* ==========================================================
   LINKS DE NAVEGAÇÃO — sublinhado animado + estado ativo
   ========================================================== */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--grad-primary);
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ==========================================================
   MENU MOBILE — abertura/fechamento suave (sem "pulo")
   ========================================================== */
@media (max-width: 767px) {
    #menu {
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        padding-top: 0;
        padding-bottom: 0;
        pointer-events: none;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                    opacity 0.3s ease,
                    padding 0.4s ease;
    }

    #menu.menu-open {
        max-height: 28rem;
        opacity: 1;
        padding-top: 1.5rem;
        padding-bottom: 1.5rem;
        pointer-events: auto;
    }
}

/* ==========================================================
   MICRO-ANIMAÇÃO DE ENTRADA — blocos de conteúdo
   ========================================================== */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================
   ACESSIBILIDADE — respeita preferência do usuário por menos movimento
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}