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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', sans-serif;
    color: #333;
    line-height: 1.7;
    background: #fff;
}

a {
    color: #8b1a1a;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 40px;
    background: rgba(60, 40, 30, 0.95);
    backdrop-filter: blur(8px);
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo:hover {
    text-decoration: none;
}

.nav-logo img {
    height: 36px;
    width: auto;
}

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

.nav-links a {
    color: #ddd;
    padding: 6px 16px;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 400;
    transition: all 0.2s ease;
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    text-decoration: none;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #5a3a2a 0%, #8b6948 40%, #a07850 70%, #c4a070 100%);
    padding: 100px 60px 60px;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    gap: 60px;
    align-items: center;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    width: 260px;
    height: 340px;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.placeholder-photo {
    width: 260px;
    height: 340px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.6);
    font-family: 'Montserrat', sans-serif;
}

.hero-text {
    color: #f0e8df;
}

.hero-text h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.8rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.bio {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 16px;
    color: #e8ddd0;
}

.bio a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.bio a:hover {
    color: #ffd;
}

.hero-contact {
    margin-top: 28px;
}

.hero-contact p {
    font-size: 1.05rem;
    margin-bottom: 4px;
    color: #e8ddd0;
}

.hero-contact a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ===== Sections ===== */
.section {
    padding: 50px 60px;
    border-bottom: 1px solid #e8e0d8;
}

.section:last-of-type {
    border-bottom: none;
}

.section-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    gap: 60px;
    align-items: baseline;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
    min-width: 240px;
    flex-shrink: 0;
}

.section-content {
    flex: 1;
}

/* ===== Contact Section ===== */
.contact-section {
    background: #faf8f5;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-icon {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: #fff;
    text-decoration: none;
}

.social-icon:hover {
    transform: translateY(-2px);
    text-decoration: none;
}

.social-icon svg {
    width: 22px;
    height: 22px;
}

/* Social icon colors */
.social-icon:nth-child(1) { background: #0077b5; }  /* LinkedIn */
.social-icon:nth-child(2) { background: #000; }      /* X */
.social-icon:nth-child(3) { background: #0085ff; }   /* Bluesky */
.social-icon:nth-child(4) { background: #333; }      /* GitHub */
.social-icon:nth-child(5) { background: #4285F4; }   /* Google Scholar */
.social-icon:nth-child(6) { background: #8b1a1a; }   /* Email */

.social-icon:nth-child(1):hover { background: #005f8f; }
.social-icon:nth-child(2):hover { background: #333; }
.social-icon:nth-child(3):hover { background: #0066cc; }
.social-icon:nth-child(4):hover { background: #555; }
.social-icon:nth-child(5):hover { background: #3367d6; }
.social-icon:nth-child(6):hover { background: #6b1010; }

/* ===== Papers ===== */
.paper {
    margin-bottom: 24px;
    font-size: 1.05rem;
    line-height: 1.7;
}

.paper:last-child {
    margin-bottom: 0;
}

.paper-title {
    color: #8b1a1a;
    font-weight: 600;
}

.paper-title:hover {
    text-decoration: underline;
}

.paper-title-plain {
    color: #333;
    font-weight: 600;
}

.paper a {
    color: #8b1a1a;
}

/* ===== Footer ===== */
.footer {
    padding: 30px 60px;
    text-align: center;
    color: #999;
    font-size: 0.9rem;
    background: #faf8f5;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .hero {
        padding: 90px 30px 40px;
    }

    .hero-content {
        flex-direction: column;
        align-items: center;
        gap: 30px;
        text-align: center;
    }

    .hero-photo img,
    .placeholder-photo {
        width: 200px;
        height: 260px;
    }

    .hero-text h1 {
        font-size: 2.2rem;
    }

    .section {
        padding: 40px 30px;
    }

    .section-container {
        flex-direction: column;
        gap: 16px;
    }

    .section-title {
        min-width: unset;
    }

    .navbar {
        padding: 10px 20px;
    }

    .nav-links a {
        padding: 6px 10px;
        font-size: 0.85rem;
    }
}

@media (max-width: 500px) {
    .hero-text h1 {
        font-size: 1.8rem;
    }

    .bio {
        font-size: 1rem;
    }

    .nav-logo {
        font-size: 1rem;
    }
}