:root {
    --c-primary: #094a91;
    --c-bg-paper: #F9F7F1;
    --c-text-ink: #2b2b2b;
}

/* Base */
body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--c-bg-paper);
    color: var(--c-text-ink);
    overflow-x: hidden;
}

/* Navegación Superior */
.top-nav {
    position: absolute;
    top: 0;
    width: 100%;
    padding: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.btn-home {
    background: rgba(255, 255, 255, 0.9);
    color: var(--c-primary);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.btn-home:hover {
    transform: scale(1.1);
    background: var(--c-primary);
    color: #fff;
}

/* Banner Encabezado */
.letter-hero {
    height: 60vh;
    background-image: var(--hero-bg);
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    align-items: flex-end;
    padding: 4rem 2rem;
}

.letter-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(9, 74, 145, 0.9),
        transparent
    );
}

.hero-titles {
    position: relative;
    z-index: 2;
    color: white;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    text-align: center;
}

.hero-titles h1 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 0.5rem;
}

.hero-titles p {
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.9;
}

/* Contenedor Principal */
.letter-container {
    max-width: 800px;
    margin: -5rem auto 4rem;
    position: relative;
    z-index: 5;
    background: #fff;
    padding: 4rem;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(9, 74, 145, 0.08);
    border-top: 1px solid #eaeaea;
}

/* Carta Física */
.physical-letter {
    margin-bottom: 3rem;
    text-align: center;
}

.physical-letter img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    transform: rotate(-1deg);
    transition: transform 0.4s ease;
}

.physical-letter img:hover {
    transform: rotate(0deg) scale(1.02);
}

.separator {
    width: 60px;
    height: 2px;
    background: #e0dcd0;
    margin: 3rem auto;
}

/* Transcripción */
.transcription-content {
    font-family: 'Lora', serif;
    font-size: 1.25rem;
    line-height: 1.9;
    color: #3a3a3a;
}

.transcription-content p {
    margin-bottom: 1.8rem;
}

.quote-highlight {
    font-size: 1.5rem;
    color: var(--c-primary);
    font-style: italic;
    border-left: 4px solid var(--c-primary);
    padding-left: 1.5rem;
    margin: 2rem 0;
}

.signature {
    margin-top: 4rem;
    font-family: 'Poppins', sans-serif;
    text-align: right;
    color: var(--c-primary);
}

.signature strong {
    display: block;
    font-size: 1.3rem;
}

/* Footer */
.letter-footer {
    text-align: center;
    padding: 2rem 0 6rem;
}

.btn-return {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 1rem 2.5rem;
    background: transparent;
    color: var(--c-primary);
    border: 2px solid var(--c-primary);
    border-radius: 50px;
    text-decoration: none;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-return:hover {
    background: var(--c-primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(9, 74, 145, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
    .letter-container {
        margin: -3rem 1rem 3rem;
        padding: 2rem;
    }

    .transcription-content {
        font-size: 1.1rem;
    }
}