:root {
    /* Color Palette */
    --color-accent: #Ef767a;
    --color-secondary: #456990;
    --color-bg: #Fffce8;
    --color-text-neutral: #717568;
    --color-primary-dark: #000411;
    --color-white: #ffffff;

    /* Fonts */
    --font-heading: 'Lora', serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 12px;
    --radius-lg: 24px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-primary-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* --- Header --- */
header {
    padding: var(--spacing-md) 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    /* Solid background, no blur as requested */
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
}

.hero-background::before {
    content: none;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-links a:not(.btn-primary) {
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-links a:not(.btn-primary):hover {
    color: var(--color-accent);
}

/* --- Buttons --- */
.btn-primary {
    display: inline-block;
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid var(--color-primary-dark);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    display: inline-block;
    background-color: transparent;
    color: var(--color-primary-dark);
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid var(--color-primary-dark);
}

.btn-secondary:hover {
    background-color: rgba(0, 4, 17, 0.03);
    transform: translateY(-2px);
}

.btn-submit {
    background-color: var(--color-accent);
    color: var(--color-white);
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: background 0.3s ease, transform 0.2s ease;
    width: 100%;
    margin-top: var(--spacing-sm);
}

.btn-submit:hover {
    background-color: #d66569;
    /* Darker shade of accent */
    transform: translateY(-1px);
}

/* --- Hero Section --- */
#hero {
    padding: calc(var(--spacing-xl) + var(--spacing-md)) 0 var(--spacing-xl);
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.tagline {
    display: block;
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.headline {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
}

.subheadline {
    font-size: 1.25rem;
    color: var(--color-text-neutral);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    font-weight: 300;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Abstract background elements for Hero */
.hero-background::before {
    content: none;
    /* Pink circle removed */
}

.hero-background::after {
    content: none;
    /* Blue circle removed */
}

/* --- Philosophy/Cards Section --- */
#filosofia,
#proyectos {
    padding: var(--spacing-xl) 0;
}

#proyectos {
    background-color: rgba(69, 105, 144, 0.03);
    /* Extremely subtle blue tint for differentiation */
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.section-header h3 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-dark);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-neutral);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.glass {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 4px 20px rgba(0, 4, 17, 0.05);
    border-radius: var(--radius-md);
}

.card {
    padding: var(--spacing-md);
    transition: transform 0.3s ease;
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 4, 17, 0.08);
}

.card-icon {
    font-size: 2rem;
    /* Adjusted for FA icons */
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
    /* #456990 */
}

/* Project card override removed to keep uniformity */

.card h4 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary-dark);
    /* #000411 */
    font-family: var(--font-body);
    /* Inter */
}

.card p {
    color: var(--color-text-neutral);
    font-size: 0.95rem;
}

/* --- Contact Section --- */
#contacto {
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.contact-info h3 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.contact-info p {
    font-size: 1.1rem;
    color: var(--color-text-neutral);
    margin-bottom: var(--spacing-md);
}

.contact-details li {
    margin-bottom: var(--spacing-xs);
    font-size: 1.1rem;
    font-weight: 500;
}

.contact-details a {
    color: var(--color-secondary);
    text-decoration: underline;
    text-decoration-color: transparent;
}

.contact-details a:hover {
    text-decoration-color: var(--color-secondary);
}

.contact-form-container {
    padding: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-primary-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid rgba(0, 4, 17, 0.1);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.8);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(69, 105, 144, 0.1);
}

.hidden {
    display: none;
}

#form-feedback p {
    color: green;
    text-align: center;
    margin-top: var(--spacing-sm);
    font-weight: 600;
}

/* --- Footer --- */
footer {
    padding: var(--spacing-md) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    text-align: center;
    color: var(--color-text-neutral);
    font-size: 0.9rem;
}

/* --- Mobile Menu Button --- */
.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-primary-dark);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 5rem;
    }

    .headline {
        font-size: 2.5rem;
    }

    /* Mobile Navigation */
    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        /* Hidden by default on mobile */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 2px solid rgba(0, 0, 0, 0.1);
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .hero-background::before {
        width: 80vw;
        height: 80vw;
    }

    .section-header h3 {
        font-size: 2rem;
    }
}