/* Variables Globales (Modo Claro - Premium Dermocosmético) */
:root {
    --bg-main: #FFFFFF;
    --bg-sidebar: #FFFFFF;
    --text-primary: #2B2830;
    --text-secondary: #413F44;
    --accent-color: #E41F33;
    --border-color: #c1c0c2;
    --highlight-bg: #f4f4f4;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-speed: 0.3s;
    --text-highlight: #e41f33;
}

/* Modo Oscuro (Biotecnológico) */
[data-theme="dark"] {
    --bg-main: #2b2830;
    --bg-sidebar: #151419;
    --text-primary: #ffeef0;
    --text-secondary: #FFFFFF;
    --accent-color: #e41f33;
    --border-color: #4b4a57;
    --highlight-bg: #18181d;
    --text-highlight: #fc707e;
}

/* Reseteo y Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: background-color var(--transition-speed) ease;
    scroll-padding-top: 140px; 
}

/* Tipografía */
h1, h2, h3, h4 { 
    color: var(--text-primary); 
    margin-bottom: 1rem; 
    font-weight: 600; 
}
h1 { 
    font-size: 2.5rem; 
    border-bottom: 2px solid var(--accent-color); 
    padding-bottom: 10px;
}
h2 { 
    font-size: 2rem; 
    margin-top: 3rem; 
    color: var(--text-primary); 
}
h3 { 
    font-size: 1.4rem; 
    margin-top: 2rem; 
}
p, li { 
    line-height: 1.8; 
    margin-bottom: 1rem; 
    color: var(--text-secondary); 
}
ul { 
    padding-left: 2rem; 
    margin-bottom: 1.5rem; 
}

/* Bullets y Resaltados */
.resaltado {
    color: var(--text-highlight);
    font-weight: 600;
    transition: color var(--transition-speed) ease;
}

li::marker {
    color: var(--text-highlight);
}

/* Estilos de Marca / Logo */
.brand {
    display: flex;
    align-items: center;
    height: 100%;
    font-weight: bold; 
    font-size: 1.2rem; 
    letter-spacing: 1px;
}

.logo {
    height: 35px;
    width: auto;
    display: block;
    transition: opacity 0.3s ease;
}

html[data-theme="light"] .logo-oscuro { display: none !important; }
html[data-theme="light"] .logo-claro { display: block; }
html[data-theme="dark"] .logo-claro { display: none !important; }
html[data-theme="dark"] .logo-oscuro { display: block; }

/* Botón de Conmutación de Tema */
.theme-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    padding: 5px 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color var(--transition-speed) ease;
}

.theme-btn:hover {
    color: var(--accent-color);
}

/* Loader Pantalla Completa */
.loader-container {
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100vw; 
    height: 100vh;
    background-color: var(--bg-main);
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center;
    z-index: 9999; 
    transition: opacity 0.5s ease;
}

.spinner {
    width: 50px; 
    height: 50px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { 
    0% { transform: rotate(0deg); } 
    100% { transform: rotate(360deg); } 
}

/* Efectos de Revelado Suave */
.reveal {
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease;
    visibility: hidden;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0px);
    visibility: visible;
}

.reveal-left {
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0px);
}

.reveal-right {
    position: relative;
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease;
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0px);
}