/* ===================================================================
   MAIN.CSS — Power BI Guide 🌸
   Estilos base, variables globales y componentes fundamentales
   =================================================================== */

/* ===== RESET COMPLETO - ELIMINAR ESPACIOS SUPERIORES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  margin: 0 !important;
  padding: 0 !important;
}

body {
  margin: 0 !important;
  padding: 0 !important;
  min-height: 100vh;
}

/* Sidebar sin margin ni padding superior */
.site-sidebar {
  margin: 0 !important;
  padding-top: 16px;
  top: 0;
  left: 0;
}

/* Page wrapper pegado arriba */
.page-wrapper {
  margin-top: 0 !important;
  padding-top: 0 !important;
}

/* Contenido principal sin margin superior */
.main-content, main {
  margin-top: 0 !important;
  padding-top: 24px;
}

/* Hero sin margin superior */
.hero, .page-hero {
  margin-top: 0 !important;
  padding-top: 24px;
}

/* Topic header sin margin superior */
.topic-header {
  margin-top: 0 !important;
  padding-top: 32px;
}

/* Breadcrumb sin margin superior excesivo */
.breadcrumb {
  margin-top: 0 !important;
  padding-top: 16px;
}

/* === VARIABLES CSS === */
:root {
  /* Paleta principal Kawaii Power BI */
  --color-blush: #FAEEEE;
  --color-coral: #E74E37;
  --color-rose: #F3E5E5;
  --color-mauve: #D9CBCB;
  --color-slate: #929C9C;

  /* Colores complementarios */
  --color-dark: #2C2C2C;
  --color-white: #FFFFFF;
  --color-peach: #F9A58B;
  --color-success: #5BAD92;
  --color-warning: #F2B84B;
  --color-code-bg: #2E2E3A;

  /* Tipografía */
  --font-main: 'Plus Jakarta Sans', sans-serif;
  --font-code: 'Fira Code', monospace;

  /* Espaciado y layout */
  --sidebar-width: 280px;
  --header-height: 64px;
  --border-radius-sm: 6px;
  --border-radius: 12px;
  --border-radius-lg: 20px;

  /* Sombras */
  --shadow-sm: 0 1px 4px rgba(44, 44, 44, 0.08);
  --shadow: 0 4px 16px rgba(44, 44, 44, 0.10);
  --shadow-md: 0 8px 32px rgba(44, 44, 44, 0.14);

  /* Transición global */
  --transition: all 0.2s ease;
  --transition-slow: all 0.35s ease;
}

/* === RESET Y BASE === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background-color: var(--color-blush);
  color: var(--color-dark);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  text-decoration: underline;
  color: var(--color-peach);
}

::selection {
  background: var(--color-coral);
  color: var(--color-white);
}

/* === TIPOGRAFÍA === */
h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-dark);
}

.title-by {
  font-size: 0.65em;
  font-weight: 500;
  color: var(--color-slate);
  display: inline-block;
  margin-left: 0.5rem;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.3;
}

h3 {
  font-size: 1.375rem;
  font-weight: 600;
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
}

strong {
  font-weight: 600;
}

/* === SECCIÓN HERO === */
.hero {
  margin: 0;
  padding: 2rem 2rem 1.25rem;
  text-align: center;
  background: linear-gradient(135deg, var(--color-rose) 0%, var(--color-blush) 60%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background-image: url('../images/Logo Kawaii.jpg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-slate);
  margin: 0.5rem auto 1rem;
  max-width: 560px;
}

.search-wrapper {
  position: relative;
  max-width: 520px;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 3rem;
  border-radius: var(--border-radius-lg);
  border: 2px solid var(--color-mauve);
  background: var(--color-white);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: var(--transition);
  outline: none;
}

.search-input:focus {
  border-color: var(--color-coral);
  box-shadow: 0 0 0 3px rgba(231, 78, 55, 0.12);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  pointer-events: none;
}

/* === SECCIÓN TOPICS === */
.topics-section {
  padding: 1rem 2rem 2rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.75rem;
  color: var(--color-dark);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* === BOTÓN VOLVER ARRIBA === */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-coral);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
  z-index: 200;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-peach);
  transform: translateY(-2px);
}

/* === UTILIDADES === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}