/* ==========================================================================
   Alex Rivera Portfolio Theme: Light Blue & Ultra-Clean Responsive Typography
   ========================================================================== */

/* Color Palette & Global Variables */
:root {
    /* Custom Light Blue Palette */
    --bg-primary: #f0f9ff;          /* Airy, clean light sky blue background */
    --bg-secondary: #e0f2fe;        /* Soft ocean mist blue for alternating sections */
    --bg-card: #ffffff;             /* Crisp white cards to pop off the light blue */
    --color-primary: #0284c7;       /* Energetic primary sky blue */
    --color-primary-hover: #0369a1; /* Slightly deeper blue for action hovers */
    --color-accent: #38bdf8;        /* Sky accent highlighting active items */
    --color-border: #bae6fd;        /* Refined soft blue border lines */
    
    /* Text colors (Deep Slate for excellent contrast against light blue) */
    --color-text: #0f172a;          /* Slate 900 */
    --color-text-muted: #334155;    /* Slate 700 */
    --color-text-light: #475569;    /* Slate 600 */
    
    /* Global Styles & Layout */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows colored subtly with primary blue to feel unified */
    --shadow-sm: 0 2px 8px rgba(2, 132, 199, 0.04);
    --shadow-md: 0 12px 24px -6px rgba(2, 132, 199, 0.08), 0 4px 12px -2px rgba(2, 132, 199, 0.04);
    --shadow-lg: 0 24px 48px -12px rgba(2, 132, 199, 0.12), 0 8px 24px -8px rgba(2, 132, 199, 0.08);

    /* LARGER FONT CONFIGURATION */
    --font-base-size: 19px;         /* Raised base size (standard is 16px) */
    --font-lh-body: 1.8;            /* Open, spacious line height */
    --font-lh-heading: 1.25;
}

/* Base Reset & Styling */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-base-size);
}

body {
    background-color: var(--bg-primary);
    color: var(--color-text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: var(--font-lh-body);
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container Structure */
.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography Scale - Expressive & Comfortably Large */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    line-height: var(--font-lh-heading);
    color: var(--color-text);
    margin-bottom: 1.2rem;
}

h1 {
    font-size: 3.2rem; /* Magnified heading */
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.4rem; /* Prominent section heading */
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.6rem;
}

h4 {
    font-size: 1.3rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--color-text-muted);
}

.lead-text {
    font-size: 1.25rem; /* Large highlight paragraphs */
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Section Header Styles */
.section-header {
    margin-bottom: 4.5rem;
    max-width: 750px;
}

.section-header.text-center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    padding: 0.25rem 0.75rem;
    background-color: rgba(2, 132, 199, 0.08);
    border-radius: 50px;
}

.section-title {
    margin-top: 0.5rem;
}

.section-description {
    font-size: 1.15rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Utilities */
.d-none {
    display: none !important;
}

/* Button UI Components - Enhanced Sizes */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

.btn-sm {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.05rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(2, 132, 199, 0.25);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: rgba(2, 132, 199, 0.05);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(240, 249, 255, 0.9); /* Transparent body bg matching */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 1.2rem 0;
    transition: background var(--transition-fast);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--color-text);
}

.logo-icon {
    color: var(--color-primary);
    transition: transform var(--transition-normal);
}

.logo:hover .logo-icon {
    transform: rotate(15deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    position: relative;
    padding: 0.25rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
}

/* Hero Section */
.hero-section {
    padding: 7.5rem 0 6rem 0;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.badge {
    display: inline-flex;
    align-items: center;
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1.8rem;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: 3.6rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.15rem;
    line-height: 1.75;
    color: var(--color-text-light);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1.2rem;
}

.hero-image-wrapper {
    position: relative;
    justify-self: center;
    z-index: 1;
}

.hero-image-bg {
    position: absolute;
    top: -15px;
    left: -15px;
    right: 15px;
    bottom: 15px;
    border-radius: var(--border-radius-lg);
    background-color: var(--color-border);
    z-index: -1;
    transform: rotate(-3deg);
}

.hero-image {
    width: 420px;
    height: 420px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    border: 4px solid #ffffff;
    box-shadow: var(--shadow-lg);
}

/* About Section */
.about-section {
    padding: 7.5rem 0;
    background-color: var(--bg-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 5rem;
    align-items: start;
}

.about-text p {
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3.5rem;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
}

.about-skills {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
}

.skills-title {
    margin-bottom: 1.8rem;
    font-size: 1.4rem;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    font-size: 0.95rem;
}

.skill-name {
    color: var(--color-text);
}

.skill-percentage {
    color: var(--color-primary);
}

.skill-bar {
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 50px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: 50px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Portfolio Section */
.portfolio-section {
    padding: 7.5rem 0;
    background-color: var(--bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.2rem;
}

.project-card {
    background-color: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1.5 / 1;
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-info {
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-category {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 0.6rem;
}

.project-title {
    font-size: 1.35rem;
    margin-bottom: 0.8rem;
}

.project-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: 1.8rem;
    line-height: 1.6;
    flex-grow: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.link-arrow {
    transition: transform var(--transition-fast);
}

.project-link:hover .link-arrow {
    transform: translateX(4px);
}

/* Services Section */
.services-section {
    padding: 7.5rem 0;
    background-color: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 2.8rem 2.2rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-md);
    background-color: rgba(2, 132, 199, 0.08);
    color: var(--color-primary);
    margin-bottom: 1.8rem;
    transition: all var(--transition-normal);
}

.service-card:hover .service-icon {
    background-color: var(--color-primary);
    color: #ffffff;
    transform: scale(1.05);
}

.service-card-title {
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.service-card-desc {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Testimonials Section */
.testimonials-section {
    padding: 7.5rem 0;
    background-color: var(--bg-secondary);
}

.testimonials-slider {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    max-width: 1040px;
    margin: 0 auto;
}

.testimonial-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.stars {
    color: #eab308;
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    letter-spacing: 0.15em;
}

.testimonial-text {
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.75;
    color: var(--color-text);
    margin-bottom: 2rem;
}

.client-info {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.client-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
}

.client-name {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
    font-family: 'Inter', sans-serif;
}

.client-role {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* Contact Section */
.contact-section {
    padding: 7.5rem 0;
    background-color: var(--bg-primary);
}

.contact-box {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.contact-info-panel {
    background-color: var(--bg-secondary);
    padding: 4.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-title {
    font-size: 2.4rem;
    margin-bottom: 1.5rem;
}

.contact-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 3.5rem;
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    font-size: 1.05rem;
    color: var(--color-text);
    font-weight: 500;
}

.contact-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-form-panel {
    padding: 4.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.6rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    padding: 0.9rem 1.2rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-text);
    outline: none;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.12);
    background-color: #ffffff;
}

.form-feedback {
    display: none;
    padding: 1rem 1.2rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
}

.form-feedback.success {
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.form-feedback.active {
    display: block;
}

/* Footer Section */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-copy {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

.footer-links {
    display: flex;
    gap: 1.8rem;
}

.footer-link {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.footer-link:hover {
    color: var(--color-text);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--color-primary);
    color: #ffffff;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: 99;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Media Queries & Responsive Styling
   ========================================================================== */

@media (max-width: 1024px) {
    html {
        font-size: 18px; /* Slightly scale base typography size on tablets */
    }
    
    .hero-container {
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-image {
        width: 340px;
        height: 340px;
    }
    
    .portfolio-grid,
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-slider {
        grid-template-columns: 1fr;
        max-width: 650px;
    }
    
    .contact-box {
        grid-template-columns: 1fr;
    }
    
    .contact-info-panel {
        padding: 3rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 17px; /* Fine-tune standard size on smaller screens */
    }

    .container {
        padding: 0 1.5rem;
    }

    .navbar {
        padding: 1rem 0;
    }

    .mobile-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 73px; /* Header thickness alignment */
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(240, 249, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        padding: 3rem;
        transform: translateY(-150%);
        transition: transform var(--transition-slow);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .hero-section {
        padding: 5rem 0 4rem 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 3.5rem;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .badge {
        margin-bottom: 1.2rem;
    }

    .hero-title {
        font-size: 2.6rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3.5rem;
    }

    .portfolio-grid,
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .contact-form-panel {
        padding: 3rem 1.5rem;
    }

    .contact-info-panel {
        padding: 3rem 1.5rem;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}