/* CSS Variables - Professional Charcoal Gray Theme */
:root {
    /* Primary Professional Charcoal Palette */
    --primary-color: #374151;
    --primary-dark: #1f2937;
    --primary-light: #6b7280;
    --primary-lighter: #f3f4f6;
    
    /* Secondary Professional Colors */
    --secondary-color: #111827;
    --accent-color: #d97706;
    --accent-light: #fbbf24;
    --success-color: #059669;
    
    /* Text Colors - Professional Gray Tones */
    --text-primary: #111827;
    --text-secondary: #374151;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    
    /* Background Colors - Professional Clean */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-light: #f3f4f6;
    --bg-accent-light: #fef3c7;
    
    /* Border and Card Colors */
    --border-color: #e5e7eb;
    --border-accent: #d1d5db;
    --card-bg: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn--primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.btn--primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn--secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.btn--secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn--full {
    width: 100%;
}

/* Header - Professional Charcoal */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.nav__brand h2 {
    color: var(--secondary-color);
    margin: 0;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav__link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    transition: var(--transition);
    position: relative;
}

.nav__link:hover {
    color: var(--primary-color);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav__link:hover::after {
    width: 100%;
}

.nav__toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-blue-light) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

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

.hero__title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero__title-accent {
    color: var(--primary-color);
}

.hero__description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.hero__buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__illustration {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.hero__icon {
    font-size: 6rem;
    color: white;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section__header {
    text-align: center;
    margin-bottom: 4rem;
}

.section__title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section__subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background-color: var(--bg-light);
}

.about__content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about__text h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.about__list {
    list-style: none;
    margin-top: 1.5rem;
}

.about__list li {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.about__list i {
    color: var(--primary-color);
    margin-right: 0.75rem;
    font-size: 1.1rem;
}

.about__stats {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat p {
    margin: 0;
    font-weight: 500;
}

/* Services Section */
.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service__card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.service__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    background: var(--bg-blue-light);
}

.service__icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
}

.service__icon i {
    font-size: 1.5rem;
    color: white;
}

.service__card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service__card p {
    margin: 0;
}

/* Experience Section */
.experience {
    background-color: var(--bg-secondary);
}

.experience__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.experience__timeline {
    position: relative;
}

.experience__timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
}

.timeline__item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 3rem;
}

.timeline__marker {
    position: absolute;
    left: -20px;
    top: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: var(--shadow-md);
}

.timeline__content h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline__content p {
    margin: 0;
}

.experience__technologies h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.tech__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
}

.tech__item {
    background: white;
    padding: 0.75rem;
    border-radius: var(--radius);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.tech__item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.testimonial__card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.testimonial__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.testimonial__rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
    color: var(--success-color);
}

.testimonial__text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial__author h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.testimonial__author p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Contact Section */
.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact__info h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact__details {
    margin-top: 2rem;
}

.contact__item {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.contact__item i {
    color: var(--primary-color);
    margin-right: 1rem;
    width: 20px;
}

/* Contact Form */
.contact__form {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.form__group {
    position: relative;
    margin-bottom: 1.5rem;
}

.form__group input,
.form__group textarea,
.form__group select {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.form__group input:focus,
.form__group textarea:focus,
.form__group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__group label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    color: var(--text-light);
    transition: var(--transition);
    pointer-events: none;
}

.form__group input:focus + label,
.form__group textarea:focus + label,
.form__group input:not(:placeholder-shown) + label,
.form__group textarea:not(:placeholder-shown) + label {
    top: -0.5rem;
    left: 0.75rem;
    font-size: 0.875rem;
    color: var(--primary-color);
    background: white;
    padding: 0 0.25rem;
}

.form__group select {
    cursor: pointer;
}

.form__group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer - Corporate */
.footer {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    color: white;
    border-top: 3px solid var(--primary-color);
    padding: 3rem 0 1rem;
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer__brand h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer__brand p {
    color: var(--text-light);
}

.footer__links h4,
.footer__contact h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer__links ul {
    list-style: none;
}

.footer__links li {
    margin-bottom: 0.5rem;
}

.footer__links a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer__contact p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.footer__bottom {
    border-top: 1px solid #334155;
    padding-top: 1rem;
    text-align: center;
}

.footer__bottom p {
    color: var(--text-light);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav__menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav__menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav__toggle {
        display: block;
    }
    
    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero__title {
        font-size: 2.5rem;
    }
    
    .hero__buttons {
        justify-content: center;
    }
    
    .hero__illustration {
        width: 200px;
        height: 200px;
    }
    
    .hero__icon {
        font-size: 4rem;
    }
    
    .about__content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about__stats {
        flex-direction: row;
        justify-content: space-around;
    }
    
    .services__grid {
        grid-template-columns: 1fr;
    }
    
    .experience__content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact__content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .tech__grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .hero {
        padding: 6rem 0 2rem;
    }
    
    .hero__title {
        font-size: 2rem;
    }
    
    .hero__buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .about__stats {
        flex-direction: column;
    }
    
    .tech__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }