:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #a0a0a0;
    /* Grey for subtle lines */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --sidebar-width: 50%;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    margin: 0;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 400;
    text-transform: uppercase;
}

h1.big-title {
    font-size: 5rem;
    line-height: 0.9;
    letter-spacing: -2px;
    margin-bottom: 2rem;
}

h2.section-title {
    font-size: 3rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid black;
    padding-bottom: 1rem;
    display: block;
}

.chapter-number {
    font-size: 6rem;
    font-family: var(--font-heading);
    display: block;
    line-height: 1;
    margin-bottom: -1rem;
}

.text-uppercase-spaced {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Layout Split */
.split-container {
    display: flex;
    min-height: 100vh;
}

.split-left {
    width: var(--sidebar-width);
    height: 100vh;
    position: sticky;
    top: 0;
    background: url('../img/pareja.png') no-repeat center center/cover;
    filter: grayscale(100%) contrast(120%);
    z-index: 10;
}

.split-right {
    width: var(--sidebar-width);
    background: white;
    padding: 0;
}

/* Content Sections */
.content-section {
    padding: 6rem 4rem;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-bottom: 1px solid #eaeaea;
}

/* Minimal Elements */
.btn-editorial {
    background: black;
    color: white;
    border: none;
    padding: 15px 40px;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 2px;
    display: inline-block;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-editorial:hover {
    background: white;
    color: black;
    border: 1px solid black;
    text-decoration: none;
}

/* Countdown Minimal */
.countdown-container {
    display: flex;
    gap: 3rem;
    margin-top: 2rem;
}

.countdown-number {
    font-size: 4rem;
    font-family: var(--font-heading);
}

.countdown-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Music Control (Black Minimal) */
.music-control {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
}

.btn-music-black {
    width: 40px;
    height: 40px;
    background: white;
    border: 1px solid black;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.btn-music-black:hover {
    background: black;
    color: white;
}

/* Responsive */
@media (max-width: 900px) {
    .split-container {
        flex-direction: column;
    }

    .split-left {
        width: 100%;
        height: 60vh;
        position: relative;
    }

    .split-right {
        width: 100%;
    }

    .content-section {
        padding: 4rem 2rem;
        min-height: auto;
    }

    h1.big-title {
        font-size: 3.5rem;
    }
}