/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #4A90E2;
    --secondary-teal: #50C9C3;
    --accent-purple: #7B68EE;
    --light-blue-bg: #F0F7FF;
    --light-teal-bg: #E8F9F8;
    --light-purple-bg: #F5F0FF;
    --dark-navy: #2C3E50;
    --darker-navy: #1A252F;
    --white: #ffffff;
    --text-gray: #555555;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Rubik', sans-serif;
    font-size: 15px;
    line-height: 28px;
    color: var(--dark-navy);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== NAVIGATION ===== */
.navbar {
    background: linear-gradient(135deg, var(--white) 0%, var(--light-blue-bg) 100%);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(74, 144, 226, 0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--primary-blue);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-brand .logo {
    width: 32px;
    height: 32px;
    color: var(--primary-blue);
    flex-shrink: 0;
}

.nav-brand h3 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 20px;
    color: var(--dark-navy);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    font-weight: 500;
    color: var(--dark-navy);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-blue);
}

/* ===== HAMBURGER MENU ===== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    height: 750px;
    background-image: url('public/LSHeroImageFancy.png');
    background-size: cover;
    background-position: center center;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: left;
    color: var(--white);
    max-width: 1200px;
    padding: 0 40px;
    margin: 0 auto;
    width: 100%;
}

.hero h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 70px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 15px;
}

.hero h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 32px;
    font-weight: 300;
    margin-bottom: 20px;
}

.hero p {
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    font-weight: 300;
    margin-bottom: 30px;
}

/* ===== BUTTONS ===== */
.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    color: var(--white);
    padding: 15px 35px;
    border-radius: 30px;
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

.cta-button:hover {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(80, 201, 195, 0.5);
}

/* ===== SECTIONS ===== */
.section {
    padding: 80px 0;
    background-color: var(--white);
}

.section-alt {
    background: linear-gradient(180deg, var(--light-blue-bg) 0%, var(--light-teal-bg) 100%);
}

.section-title {
    font-family: 'Poppins', sans-serif;
    font-size: 42px;
    font-weight: 700;
    color: var(--dark-navy);
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--secondary-teal) 50%, var(--accent-purple) 100%);
    border-radius: 2px;
}

/* ===== CONTENT CARDS ===== */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.content-card {
    background-color: var(--white);
    padding: 35px;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(74, 144, 226, 0.15);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 5px solid var(--primary-blue);
    position: relative;
    overflow: hidden;
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-blue) 0%, var(--secondary-teal) 50%, var(--accent-purple) 100%);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 25px rgba(74, 144, 226, 0.25);
}

.content-card h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.content-card p {
    margin-bottom: 12px;
}

.content-card ul {
    margin-left: 20px;
    margin-top: 10px;
}

.content-card li {
    margin-bottom: 8px;
}

/* ===== EXPERTISE SECTION ===== */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
    margin-top: 40px;
}

.expertise-column {
    background-color: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(74, 144, 226, 0.15);
    border-top: 4px solid var(--secondary-teal);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.expertise-column:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 25px rgba(80, 201, 195, 0.25);
}

.expertise-column h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 28px;
    font-weight: 600;
    color: var(--dark-navy);
    margin-bottom: 25px;
    border-bottom: 3px solid transparent;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--secondary-teal);
}

.expertise-list {
    list-style: none;
}

.expertise-list > li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    font-size: 16px;
    line-height: 1.6;
}

.expertise-list > li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-teal);
    font-weight: 700;
    font-size: 18px;
}

.expertise-list ul {
    margin-left: 20px;
    margin-top: 8px;
}

.expertise-list ul li {
    padding: 6px 0;
    font-size: 15px;
    color: var(--text-gray);
}

/* ===== RESEARCH SECTION ===== */
.research-intro {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
    font-weight: 500;
}

/* ===== CONTACT SECTION ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 40px;
    margin-bottom: 50px;
}

.contact-card {
    background: linear-gradient(135deg, var(--white) 0%, var(--light-blue-bg) 100%);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 3px 20px rgba(74, 144, 226, 0.2);
    border: 2px solid var(--primary-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 30px rgba(74, 144, 226, 0.3);
}

.contact-card h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 24px;
    font-weight: 600;
    color: var(--accent-purple);
    margin-bottom: 20px;
}

.contact-location {
    margin-bottom: 20px;
    line-height: 1.8;
}

.contact-details {
    margin-top: 15px;
    line-height: 1.8;
}

.contact-details a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.cta-section {
    text-align: center;
    margin-top: 50px;
}

/* ===== FOOTER ===== */
.footer {
    background: linear-gradient(135deg, var(--dark-navy) 0%, var(--primary-blue) 50%, var(--secondary-teal) 100%);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.footer p {
    margin-bottom: 10px;
    opacity: 0.95;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 72px;
        flex-direction: column;
        background: linear-gradient(180deg, var(--white) 0%, var(--light-blue-bg) 100%);
        width: 100%;
        text-align: center;
        transition: left 0.3s ease;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.15);
        padding: 20px 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        padding: 15px 0;
        border-bottom: 1px solid rgba(74, 144, 226, 0.1);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        font-size: 16px;
        display: block;
        width: 100%;
    }

    .hero h1 {
        font-size: 42px;
    }

    .hero h2 {
        font-size: 24px;
    }

    .section-title {
        font-size: 32px;
    }

    .content-grid,
    .expertise-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .expertise-column {
        padding: 25px;
    }

    .cta-button {
        font-size: 13px;
        padding: 12px 25px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero h2 {
        font-size: 20px;
    }

    .hero p {
        font-size: 14px;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 28px;
    }
}