* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, system-ui, Tahoma, Verdana, Arial, sans-serif;
}
body {
    background: #f8f6f2;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
/* header & nav */
.header {
    background: #0b1a1e;
    color: #f0eade;
    padding: 0.75rem 2rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    border-bottom: 3px solid #d4a54a;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.logo-icon {
    font-size: 2.2rem;
    color: #f5c542;
}
.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
}
.logo-text small {
    font-weight: 300;
    font-size: 1rem;
    margin-left: 0.5rem;
    color: #c9b694;
}
.lang-toggle {
    background: #2c3e42;
    border: 1px solid #a9844f;
    color: #f0eade;
    padding: 0.4rem 1.2rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.lang-toggle:hover {
    background: #3e555a;
    border-color: #dbb05c;
}
.navbar {
    background: #1e2f33;
    padding: 0 2rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    border-bottom: 1px solid #3e4f53;
}
.nav-menu {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 0.25rem;
}
.nav-item {
    position: relative;
}
.nav-link {
    display: block;
    padding: 0.9rem 1.4rem;
    color: #ece3d5;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: 0.15s;
    border-radius: 4px 4px 0 0;
    cursor: default;
}
.nav-link i {
    margin-right: 0.4rem;
    width: 1.1rem;
    color: #dbb05c;
}
.nav-link:hover {
    background: #2f454a;
    color: #fff6e5;
}
.nav-link.external {
    cursor: pointer;
}
.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #233b40;
    min-width: 200px;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 12px 24px rgba(0,0,0,0.4);
    padding: 0.3rem 0;
    z-index: 999;
    border-top: 2px solid #d4a54a;
}
.dropdown-content a {
    display: block;
    padding: 0.7rem 1.6rem;
    color: #ede7dc;
    text-decoration: none;
    font-weight: 400;
    border-left: 3px solid transparent;
    transition: 0.1s;
}
.dropdown-content a:hover {
    background: #2f4d54;
    border-left-color: #f5c542;
    color: #fff;
}
.nav-item.dropdown:hover .dropdown-content {
    display: block;
}
.nav-item.dropdown > .nav-link::after {
    content: " ▾";
    font-size: 0.7rem;
    color: #b89f72;
    margin-left: 0.3rem;
}
/* main container */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 2rem 2rem;
    flex: 1;
    width: 100%;
}
/* hero / original content area */
.hero {
    background: linear-gradient(145deg, #f0ebe0, #e5ddd0);
    padding: 2.5rem 2.8rem;
    border-radius: 32px;
    box-shadow: inset 0 1px 4px rgba(255,255,240,0.6), 0 12px 24px -8px rgba(0,0,0,0.15);
    margin-bottom: 2.5rem;
    border: 1px solid #dacdb8;
}
.hero h1 {
    font-size: 2.6rem;
    font-weight: 700;
    color: #1a2c30;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.hero h1 i {
    color: #c97d2b;
}
.hero p, .hero div {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #1f353b;
    margin: 0.8rem 0;
}
.hero a {
    color: #a35f1a;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted #b87d38;
}
.hero a:hover {
    color: #c77d2a;
    border-bottom: 1px solid #b87d38;
}
.hero b, .hero strong {
    color: #1d2f33;
}
.hero em {
    font-style: italic;
    color: #2d4247;
}
.download-links {
    background: #fcf9f3;
    padding: 1.2rem 1.8rem;
    border-radius: 24px;
    border-left: 6px solid #d4a54a;
    margin: 1.5rem 0;
}
.download-links p {
    margin: 0.5rem 0;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.8rem;
    margin: 2rem 0;
}
.feature-card {
    background: #fcf9f3;
    padding: 1.4rem 1.6rem;
    border-radius: 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    border: 1px solid #e4dccc;
    transition: 0.2s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: #c9b187;
}
.feature-card i {
    font-size: 2rem;
    color: #b87d38;
    margin-bottom: 0.3rem;
}
.feature-card h3 {
    font-size: 1.3rem;
    color: #1c3136;
}
.feature-card p {
    color: #3d5359;
}
.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: #1d2f33;
    border-left: 6px solid #d4a54a;
    padding-left: 1rem;
    margin: 2rem 0 1.2rem 0;
}
.footer {
    background: #0f1e22;
    color: #b8ad96;
    padding: 1.5rem 2rem;
    text-align: center;
    border-top: 2px solid #3f4f44;
    margin-top: 1.5rem;
    font-size: 0.95rem;
}
.footer i {
    color: #ca9747;
}
/* CAPTCHA & Contact styling */
.contact-section {
    margin-top: 0.5rem;
}
.contact-btn {
    display: inline-block;
    background: #1f2f34;
    color: #f5e7d3;
    padding: 0.4rem 1.4rem;
    border-radius: 40px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid #a9844f;
    transition: 0.2s;
    text-decoration: none;
}
.contact-btn:hover {
    background: #2f454a;
    border-color: #dbb05c;
}
.contact-btn i {
    margin-right: 0.5rem;
    color: #dbb05c;
}

/* CAPTCHA overlay/modal */
.captcha-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}
.captcha-overlay.active {
    display: flex;
}
.captcha-modal {
    background: #f8f6f2;
    border-radius: 32px;
    padding: 2.5rem 3rem;
    max-width: 440px;
    width: 90%;
    box-shadow: 0 24px 48px rgba(0,0,0,0.4);
    border: 2px solid #d4a54a;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}
@keyframes modalSlideIn {
    from {
        transform: translateY(-30px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}
.captcha-modal .close-btn {
    position: absolute;
    top: 12px;
    right: 18px;
    font-size: 1.8rem;
    color: #6b5f4e;
    cursor: pointer;
    transition: 0.2s;
    background: none;
    border: none;
    line-height: 1;
}
.captcha-modal .close-btn:hover {
    color: #1a2c30;
    transform: rotate(90deg);
}
.captcha-modal h3 {
    color: #1a2c30;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.captcha-modal h3 i {
    color: #c97d2b;
}
.captcha-modal p {
    color: #3d5359;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
}
.captcha-challenge {
    background: #e8e0d4;
    padding: 1rem 1.5rem;
    border-radius: 16px;
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    color: #1a2c30;
    margin-bottom: 1rem;
    border: 2px dashed #b87d38;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}
.captcha-input-group {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.captcha-input-group input {
    flex: 1;
    padding: 0.7rem 1rem;
    border: 2px solid #c9b187;
    border-radius: 12px;
    font-size: 1rem;
    background: white;
    transition: 0.2s;
    min-width: 120px;
}
.captcha-input-group input:focus {
    outline: none;
    border-color: #d4a54a;
    box-shadow: 0 0 0 3px rgba(212, 165, 74, 0.2);
}
.captcha-input-group button {
    padding: 0.7rem 1.8rem;
    background: #1f2f34;
    color: #f5e7d3;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: 0.2s;
    white-space: nowrap;
}
.captcha-input-group button:hover {
    background: #2f454a;
}
.captcha-input-group button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.captcha-error {
    color: #c0392b;
    font-size: 0.9rem;
    margin-top: -0.5rem;
    margin-bottom: 0.5rem;
    display: none;
}
.captcha-error.show {
    display: block;
}
.captcha-success {
    color: #27ae60;
    font-size: 0.95rem;
    margin-top: 0.5rem;
    display: none;
    align-items: center;
    gap: 0.5rem;
}
.captcha-success.show {
    display: flex;
}
.email-revealed {
    display: none;
    background: #e8f0e8;
    padding: 0.5rem 1.2rem;
    border-radius: 12px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: #1a2c30;
    border: 2px solid #27ae60;
    margin-top: 0.5rem;
    word-break: break-all;
}
.email-revealed.show {
    display: inline-block;
}
.email-revealed i {
    color: #27ae60;
    margin-right: 0.5rem;
}
.captcha-refresh {
    background: none;
    border: none;
    color: #6b5f4e;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: underline;
    margin-left: 0.5rem;
    transition: 0.2s;
}
.captcha-refresh:hover {
    color: #1a2c30;
}
/* language toggle */
body.lang-en .lang-zh {
    display: none;
}
body.lang-zh .lang-en {
    display: none;
}
[data-lang] {
    display: inline;
}
body.lang-en [data-lang="zh"] {
    display: none !important;
}
body.lang-zh [data-lang="en"] {
    display: none !important;
}
.lang-both {
    display: inline;
}
@media (max-width: 700px) {
    .header { flex-direction: column; align-items: stretch; gap: 0.6rem; }
    .logo-area { justify-content: center; }
    .lang-toggle { align-self: center; }
    .navbar { padding: 0 0.5rem; }
    .nav-menu { flex-direction: column; width: 100%; }
    .nav-item { width: 100%; }
    .nav-link { padding: 0.7rem 1rem; }
    .dropdown-content {
        position: static;
        box-shadow: none;
        border-radius: 0;
        border-top: none;
        background: #1f343a;
        margin-left: 1.2rem;
    }
    .dropdown-content a { padding: 0.5rem 1.2rem; }
    .hero h1 { font-size: 2rem; }
    .container { padding: 1.5rem 1rem; }
    .hero { padding: 1.8rem; }
    .captcha-modal { padding: 1.8rem; }
    .captcha-input-group { flex-direction: column; }
    .captcha-input-group button { width: 100%; }
}

/* News Section */
.news-section {
    background: #fcf9f3;
    border-radius: 16px;
    padding: 1.2rem 1.8rem;
    margin: 1.5rem 0;
    border: 2px solid #d4a54a;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.news-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a2c30;
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e4dccc;
}

.news-header i {
    color: #c97d2b;
    font-size: 1.3rem;
}

.news-ticker {
    position: relative;
    overflow: hidden;
    min-height: 2.5rem;
}

.news-item {
    display: none;
    animation: fadeSlide 0.8s ease-in-out;
    padding: 0.3rem 0;
    font-size: 1rem;
    color: #1f353b;
    align-items: center;
    gap: 0.8rem;
}

.news-item.active {
    display: flex;
}

.news-badge {
    font-size: 1.2rem;
    flex-shrink: 0;
}

@keyframes fadeSlide {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-item a {
    color: #a35f1a;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dotted #b87d38;
}

.news-item a:hover {
    color: #c77d2a;
    border-bottom: 1px solid #b87d38;
}

/* About Sections */
.about-section {
    background: #fcf9f3;
    padding: 2rem 2.5rem;
    border-radius: 24px;
    margin: 2rem 0;
    border: 1px solid #e4dccc;
    scroll-margin-top: 80px;
}

.about-section h2 {
    color: #1a2c30;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    border-bottom: 3px solid #d4a54a;
    padding-bottom: 0.5rem;
}

.about-section h2 i {
    color: #c97d2b;
}

.about-section p {
    color: #1f353b;
    line-height: 1.8;
    margin: 0.8rem 0;
}

.about-section ul {
    color: #1f353b;
    line-height: 1.8;
    padding-left: 2rem;
    margin: 0.8rem 0;
}

.about-section ul li {
    margin: 0.3rem 0;
}

/* Team Grid */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 1.5rem 0;
}

.team-member {
    background: white;
    padding: 1.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    border: 1px solid #e4dccc;
    transition: 0.3s;
}

.team-member:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.team-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: 1rem;
    border: 3px solid #d4a54a;
    object-fit: cover;
}

.team-member h3 {
    color: #1a2c30;
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.team-role {
    color: #b87d38;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
}

.team-bio {
    color: #3d5359;
    font-size: 0.9rem;
    line-height: 1.6;
}

.team-social {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 0.8rem;
}

.team-social a {
    color: #1a2c30;
    font-size: 1.4rem;
    transition: 0.2s;
}

.team-social a:hover {
    color: #b87d38;
    transform: scale(1.1);
}

/* Responsive for news and about */
@media (max-width: 700px) {
    .news-section {
        padding: 0.8rem 1rem;
    }
    .news-item {
        font-size: 0.9rem;
        flex-wrap: wrap;
    }
    .about-section {
        padding: 1.2rem;
    }
    .team-grid {
        grid-template-columns: 1fr;
    }
    .team-avatar {
        width: 100px;
        height: 100px;
    }
}

/* Donation acknowledgment */
.footer .donation-ack {
    font-size: 0.9rem;
    margin-top: 0.8rem;
    padding-top: 0.8rem;
    border-top: 1px solid #3f4f44;
    color: #8ab4d6;
}

.footer .donation-ack a {
    color: #8ab4d6;
    text-decoration: none;
    border-bottom: 1px dotted #8ab4d6;
    transition: 0.2s;
}

.footer .donation-ack a:hover {
    color: #f5c542;
    border-bottom-color: #f5c542;
}

.footer .donation-ack i {
    color: #e74c3c;
}