/* ===== VARIABLES ===== */
:root {
    /* Colors */
    --color-primary: #1a3a6c;
    --color-primary-light: #2d5aa0;
    --color-primary-dark: #0f2444;
    --color-accent: #d4a63c;
    --color-accent-hover: #c49530;
    --color-white: #ffffff;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    
    /* Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 70px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

/* ===== RESET ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ===== UTILITIES ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.section {
    padding: var(--spacing-16) 0;
}

.section--alt {
    background-color: var(--color-gray-100);
}

.section__title {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
}

.section__title--center {
    text-align: center;
}

.section__subtitle {
    text-align: center;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-12);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.btn--primary {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: transparent;
    z-index: 1000;
    transition: var(--transition);
}

.header--scrolled {
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.header--scrolled .nav__logo,
.header--scrolled .nav__link {
    color: var(--color-primary);
}

.header--scrolled .nav__toggle svg {
    stroke: var(--color-primary);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav__logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-white);
    transition: var(--transition);
}

.nav__list {
    display: flex;
    gap: var(--spacing-8);
}

.nav__link {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-white);
    transition: var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

.nav__link--cta {
    background-color: var(--color-accent);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
}

.nav__link--cta::after {
    display: none;
}

.nav__link--cta:hover {
    background-color: var(--color-accent-hover);
}

.nav__toggle,
.nav__close {
    display: none;
    color: var(--color-white);
}

/* Mobile menu */
@media (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--color-primary);
        padding: var(--spacing-16) var(--spacing-6);
        transition: var(--transition);
        box-shadow: var(--shadow-xl);
    }

    .nav__menu--open {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        gap: var(--spacing-6);
    }

    .nav__link {
        font-size: var(--text-lg);
    }

    .nav__close {
        display: block;
        position: absolute;
        top: var(--spacing-4);
        right: var(--spacing-4);
    }

    .nav__toggle {
        display: block;
    }
}

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero__background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
    z-index: -1;
}

.hero__background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(45, 90, 160, 0.4) 0%, transparent 70%);
    border-radius: 50%;
}

.hero__background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(ellipse, rgba(26, 58, 108, 0.6) 0%, transparent 70%);
    border-radius: 50%;
}

.hero__content {
    text-align: center;
    color: var(--color-white);
    padding: var(--spacing-20) 0;
}

.hero__subtitle {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-4);
}

.hero__title {
    font-family: var(--font-heading);
    font-size: var(--text-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-4);
}

.hero__tagline {
    font-size: var(--text-xl);
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: var(--spacing-8);
}

/* ===== ABOUT ===== */
.about__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-10);
    align-items: center;
}

@media (min-width: 768px) {
    .about__content {
        grid-template-columns: 300px 1fr;
    }
}

.about__photo {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--color-white);
}

.about__text {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
}

.about__location {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-primary);
    font-weight: 500;
    margin-top: var(--spacing-6);
}

.about__location svg {
    stroke: var(--color-accent);
}

/* ===== SERVICES ===== */
.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-6);
}

.service-card {
    background-color: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-card__icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-5);
}

.service-card__icon svg {
    stroke: var(--color-white);
}

.service-card__title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-3);
}

.service-card__text {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ===== PROJECTS ===== */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
}

@media (max-width: 480px) {
    .projects__grid {
        grid-template-columns: 1fr;
    }
}

.project-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.project-card__image {
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    overflow: hidden;
}

.project-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.project-card__placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-card__placeholder svg {
    stroke: rgba(255, 255, 255, 0.5);
}

.project-card__placeholder--tech {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
}

.project-card__content {
    padding: var(--spacing-6);
}

.project-card__title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-2);
}

.project-card__role {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-3);
}

.project-card__text {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
    line-height: 1.7;
}

.project-card__location {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    color: var(--color-gray-600);
}

.project-card__location svg {
    stroke: var(--color-gray-600);
}

.project-card__link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
    margin-top: var(--spacing-4);
    transition: var(--transition);
}

.project-card__link:hover {
    color: var(--color-accent);
}

.project-card__link svg {
    transition: var(--transition);
}

.project-card__link:hover svg {
    transform: translate(2px, -2px);
}

/* ===== CONTACT ===== */
.contact__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-10);
}

@media (min-width: 768px) {
    .contact__content {
        grid-template-columns: 1fr 1fr;
    }
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.contact__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.contact__item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.contact__icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact__icon svg {
    stroke: var(--color-white);
}

.contact__text {
    display: flex;
    flex-direction: column;
}

.contact__label {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-1);
}

.contact__value {
    font-weight: 500;
    color: var(--color-primary);
}

/* Contact Form */
.contact__form {
    background-color: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.form__group {
    margin-bottom: var(--spacing-5);
}

.form__label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-2);
}

.form__input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-family: var(--font-body);
    font-size: var(--text-base);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.form__input:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-12) 0 var(--spacing-6);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

@media (min-width: 768px) {
    .footer__content {
        grid-template-columns: 1fr auto auto;
        align-items: center;
    }
}

.footer__logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
}

.footer__tagline {
    font-size: var(--text-sm);
    opacity: 0.7;
    margin-top: var(--spacing-1);
}

.footer__nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4) var(--spacing-6);
}

.footer__link {
    font-size: var(--text-sm);
    opacity: 0.8;
    transition: var(--transition);
}

.footer__link:hover {
    opacity: 1;
    color: var(--color-accent);
}

.footer__social {
    display: flex;
    gap: var(--spacing-4);
}

.footer__social-link {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.footer__social-link:hover {
    background-color: var(--color-accent);
}

.footer__social-link svg {
    stroke: var(--color-white);
}

.footer__bottom {
    padding-top: var(--spacing-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer__copyright {
    font-size: var(--text-sm);
    opacity: 0.6;
}

/* ===== ANIMATIONS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger animations for cards */
.service-card,
.project-card,
.contact__item {
    opacity: 0;
    transform: translateY(20px);
}

.service-card.fade-in--visible,
.project-card.fade-in--visible,
.contact__item.fade-in--visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
    :root {
        --text-5xl: 2.25rem;
        --text-4xl: 1.875rem;
        --text-3xl: 1.5rem;
    }

    .section {
        padding: var(--spacing-12) 0;
    }

    .hero__content {
        padding: var(--spacing-16) 0;
    }

    .services__grid {
        grid-template-columns: 1fr;
    }

    .contact__form {
        padding: var(--spacing-6);
    }
}