/* Base styles */
:root {
    --primary: #1f4b99;
    --primary-dark: #163a7a;
    --accent: #ffb347;
    --accent-light: #ffd699;
    --bg: #f4f6fb;
    --text: #1a1a1f;
    --muted: #4d4d59;
    --card-bg: #ffffff;
    --border: #d9dce5;
    --gradient-start: #1f4b99;
    --gradient-end: #3b82f6;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.12);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

img {
    display: block;
    max-width: 100%;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

/* Header styles */
header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

nav {
    max-width: 1120px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

nav .brand {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-links a {
    padding: 10px 16px;
    border-radius: 999px;
    transition: all 0.25s ease;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--muted);
}

.nav-links a:hover {
    background: rgba(31, 75, 153, 0.08);
    color: var(--primary);
}

.nav-links a.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(31, 75, 153, 0.3);
}

/* Main content */
main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 48px 20px 80px;
}

/* Hero section */
.hero {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 48px;
    align-items: center;
    margin-bottom: 72px;
    padding: 32px 0;
}

.hero-text h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-text p {
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 14px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.hero-cta a {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: #ffffff;
    padding: 14px 28px;
    border-radius: 999px;
    font-weight: 600;
    transition: all 0.25s ease;
    box-shadow: 0 4px 16px rgba(31, 75, 153, 0.3);
}

.hero-cta a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(31, 75, 153, 0.4);
}

.hero-cta a.secondary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.hero-cta a.secondary:hover {
    background: var(--primary);
    color: #ffffff;
}

/* Section headings */
.section-heading {
    text-align: center;
    margin-bottom: 40px;
}

.section-heading h2 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.section-heading p {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Member grid */
.member-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.member-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.member-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(31, 75, 153, 0.2);
}

.member-card:hover::before {
    opacity: 1;
}

.member-card h3 {
    font-size: 1.35rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.member-card .role {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.member-card > p {
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.member-card .chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 4px;
}

.member-card .chip {
    background: linear-gradient(135deg, rgba(31, 75, 153, 0.08), rgba(59, 130, 246, 0.08));
    color: var(--primary);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 500;
    border: 1px solid rgba(31, 75, 153, 0.1);
}

.member-card .profile-link {
    margin-top: auto;
    padding-top: 12px;
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease;
}

.member-card .profile-link:hover {
    gap: 10px;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: #e2e8f0;
    padding: 36px 0;
}

footer .container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 0.95rem;
}

footer a {
    color: var(--accent);
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--accent-light);
}

/* Profile page layout */
.profile-header {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-bottom: 56px;
    align-items: center;
}

.profile-summary h1 {
    font-size: clamp(2rem, 5vw, 2.8rem);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.profile-summary .title {
    color: var(--accent);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}

.profile-summary > p {
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* Detail grid */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.detail-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 26px;
    display: grid;
    gap: 18px;
    box-shadow: var(--shadow-sm);
    transition: all 0.25s ease;
}

.detail-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(31, 75, 153, 0.15);
}

.detail-card h2 {
    font-size: 1.2rem;
    color: var(--primary);
    padding-bottom: 12px;
    border-bottom: 2px solid rgba(31, 75, 153, 0.1);
}

.detail-card ul {
    list-style: none;
    display: grid;
    gap: 12px;
    color: var(--muted);
    font-size: 0.95rem;
}

.detail-card li {
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.detail-card li strong {
    color: var(--text);
    min-width: 100px;
    flex-shrink: 0;
}

/* Project cards */
.project-card {
    background: linear-gradient(135deg, rgba(31, 75, 153, 0.04), rgba(59, 130, 246, 0.04));
    border: 1px solid rgba(31, 75, 153, 0.1);
    border-radius: 16px;
    padding: 20px;
    display: grid;
    gap: 10px;
    transition: all 0.25s ease;
}

.project-card:hover {
    background: linear-gradient(135deg, rgba(31, 75, 153, 0.08), rgba(59, 130, 246, 0.08));
    border-color: rgba(31, 75, 153, 0.2);
}

.project-card h3 {
    font-size: 1.05rem;
    color: var(--primary);
}

.project-card p {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Button row */
.button-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.button-row a {
    padding: 12px 22px;
    border-radius: 999px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: #ffffff;
    transition: all 0.25s ease;
    box-shadow: 0 4px 12px rgba(31, 75, 153, 0.25);
}

.button-row a:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(31, 75, 153, 0.35);
}

.button-row a.secondary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.button-row a.secondary:hover {
    background: var(--primary);
    color: #ffffff;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero, .member-card, .detail-card {
    animation: fadeInUp 0.5s ease forwards;
}

.member-card:nth-child(1) { animation-delay: 0.1s; }
.member-card:nth-child(2) { animation-delay: 0.2s; }
.member-card:nth-child(3) { animation-delay: 0.3s; }
.member-card:nth-child(4) { animation-delay: 0.4s; }

/* Responsive adjustments */
@media (max-width: 720px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .nav-links {
        width: 100%;
        justify-content: flex-start;
    }

    .hero {
        text-align: center;
    }

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

    .profile-header {
        text-align: center;
    }

    .button-row {
        justify-content: center;
    }

    footer .container {
        justify-content: center;
        text-align: center;
    }

    .section-heading {
        padding: 0 10px;
    }
}

@media (max-width: 480px) {
    .nav-links a {
        padding: 8px 12px;
        font-size: 0.85rem;
    }

    .member-card {
        padding: 22px;
    }

    .detail-card {
        padding: 20px;
    }
}