:root {
    --color-papyrus: #fdfbf7; /* Blanco crema/papiro */
    --color-vatican-gold: #C5A059; /* Dorado sobrio */
    --color-celeste-main: #86A8C2; /* Celeste sobrio y elegante */
    --color-celeste-dark: #587992;
    --color-text: #2c2c2c;
    --font-header: 'Cinzel', serif; /* Estilo Romano */
    --font-body: 'Lora', serif; /* Legible y elegante */
    --shadow-soft: 0 4px 15px rgba(0,0,0,0.05);
}

/* Textura de Papiro Sutil (simulada con CSS) */
body {
    background-color: var(--color-papyrus);
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");
    color: var(--color-text);
    font-family: var(--font-body);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Tipografías */
h1, h2, h3, .nav-link, .btn-roman {
    font-family: var(--font-header);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Header General */
header {
    background: linear-gradient(to bottom, #fff, var(--color-papyrus));
    border-bottom: 3px solid var(--color-vatican-gold);
    padding: 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-soft);
}

.logo {
    color: var(--color-celeste-dark);
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-main {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    transition: color 0.3s;
    font-size: 0.9rem;
}

.nav-link:hover {
    color: var(--color-vatican-gold);
}

/* Layout General con CSS Grid */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 80vh;
}

/* Animaciones */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-entry {
    animation: fadeInUp 0.8s ease-out forwards;
}

/* --- Página 1: Home --- */
.hero-section {
    text-align: center;
    padding: 60px 20px;
    border: 1px solid var(--color-vatican-gold);
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.5);
}

.grid-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.card {
    background: #fff;
    border: 1px solid #e0e0e0;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 4px solid var(--color-celeste-main);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-soft);
    border-top-color: var(--color-vatican-gold);
}

/* --- Página 2: Buscador y Categorías --- */
.search-container {
    text-align: center;
    margin-bottom: 40px;
}

.search-input {
    width: 60%;
    padding: 15px;
    border: 1px solid var(--color-celeste-main);
    background: #fff;
    font-family: var(--font-body);
    font-size: 1.1rem;
    border-radius: 4px;
}

.folder-structure {
    border-left: 2px solid var(--color-vatican-gold);
    padding-left: 20px;
}

.accordion-btn {
    background: none;
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
    padding: 15px;
    font-size: 1.1rem;
    color: var(--color-celeste-dark);
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    transition: background 0.3s;
}

.accordion-btn:hover {
    background: rgba(134, 168, 194, 0.1);
}

.panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
    padding-left: 20px;
    background: rgba(255,255,255,0.4);
}

/* --- Página 4: Canto y Transportador --- */
.song-layout {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 40px;
}

.lyrics-container {
    background: #fff;
    padding: 40px;
    padding-top: 55px;
    border: 1px solid #eee;
    box-shadow: var(--shadow-soft);
    font-size: 1.1rem;
    max-height: 65vh;
    overflow-y: auto;
    scroll-behavior: auto;
}

.lyric-line {
    position: relative;
    margin-top: 1.6em;
    line-height: 1.5;
    white-space: nowrap;
}

.lyric-line:first-child {
    margin-top: 0;
}

.lyric-gap {
    height: 0.9em;
}

.section-label {
    margin-top: 1.8em;
    font-family: var(--font-header);
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--color-vatican-gold);
    text-transform: uppercase;
}

.section-label:first-child {
    margin-top: 0;
}

.chord-wrap {
    position: relative;
    display: inline-block;
}

.chord {
    position: absolute;
    left: 0;
    top: -1.2em;
    font-size: 0.82em;
    color: var(--color-celeste-dark);
    font-weight: bold;
    white-space: nowrap;
    line-height: 1;
    pointer-events: none;
}

.controls-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    background: #fff;
    padding: 20px;
    border: 1px solid var(--color-vatican-gold);
}

.transposer-btn {
    display: block;
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    background: var(--color-celeste-main);
    color: white;
    border: none;
    font-family: var(--font-header);
    cursor: pointer;
    transition: 0.3s;
}

.transposer-btn:hover {
    background: var(--color-celeste-dark);
}

.tone-display {
    text-align: center;
    font-size: 1.2rem;
    margin: 15px 0;
    font-weight: bold;
    color: var(--color-vatican-gold);
}

.tono-original,
.tempo-display {
    text-align: center;
    font-size: 0.85rem;
    color: gray;
    margin: 0 0 12px 0;
}

.play-btn {
    background-color: var(--color-vatican-gold);
}

.transposer-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.tag-momento {
    color: gray;
    font-size: 0.85em;
    font-style: italic;
}

.track-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px;
    background: var(--color-celeste-dark);
    color: white;
    margin-top: 50px;
}

@media (max-width: 768px) {
    .song-layout { grid-template-columns: 1fr; }
    .search-input { width: 90%; }
    .lyrics-container { max-height: 55vh; padding: 25px; padding-top: 45px; }
}