/* ===== Reset & Variables ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg-primary: #000000;
    --color-bg-secondary: #0C0D11;
    --color-bg-card: #12131a;
    --color-bg-card-hover: #1a1b25;
    --color-accent: #186F89;
    --color-accent-glow: rgba(24, 111, 137, 0.3);
    --color-accent-secondary: #1a8aa8;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A0A0B8;
    --color-text-muted: #6B6B80;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    --color-success: #00E676;
    --color-info: #186F89;
    --gradient-primary: linear-gradient(135deg, #186F89 0%, #186F89 100%);
    --gradient-hero: radial-gradient(ellipse at 50% 0%, rgba(24, 111, 137, 0.15) 0%, transparent 60%);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --nav-height: 72px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    background: transparent;
    -webkit-backdrop-filter: blur(0px);
    backdrop-filter: blur(0px);
    border-bottom: 1px solid transparent;
    transition: background 0.4s ease, backdrop-filter 0.4s ease, border-color 0.4s ease;
}

.navbar.scrolled {
    background: rgba(0, 0, 0, 0.75);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    backdrop-filter: blur(24px) saturate(1.2);
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 24px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text-primary);
}

.nav-logo {
    height: 34px;
    width: auto;
    transition: opacity 0.3s;
}

.nav-brand:hover .nav-logo {
    opacity: 0.85;
}

.nav-brand-info {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.nav-brand-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.nav-brand-sub {
    font-size: 10px;
    color: var(--color-text-muted);
    font-weight: 400;
    letter-spacing: 0.2px;
    white-space: nowrap;
    opacity: 0.7;
}

.nav-center {
    display: flex;
    justify-content: center;
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 4px;
}

.nav-link {
    display: block;
    padding: 7px 20px;
    color: var(--color-text-muted);
    font-size: 13px;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.25s ease;
    text-decoration: none;
    letter-spacing: 0.3px;
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.nav-link.active {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.nav-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.btn-ghost {
    color: var(--color-text-muted);
    background: transparent;
    padding: 10px 16px;
}

.btn-ghost:hover {
    color: var(--color-text-primary);
}

.btn-primary {
    color: #fff;
    background: var(--color-accent);
    box-shadow: 0 2px 12px var(--color-accent-glow);
}

.btn-primary:hover {
    box-shadow: 0 4px 24px rgba(24, 111, 137, 0.5);
    transform: translateY(-1px);
    color: #fff;
    background: var(--color-accent-secondary);
}

.btn-outline {
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    background: transparent;
}

.btn-outline:hover {
    color: var(--color-text-primary);
    border-color: var(--color-border-hover);
    background: rgba(255, 255, 255, 0.04);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 15px;
    border-radius: 12px;
}

/* ===== Hamburger ===== */
.hamburger {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-border-hover);
}

.hamburger-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
    pointer-events: none;
}

.hamburger-line {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(3.5px, 3.5px);
}

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

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(3.5px, -3.5px);
}

/* ===== Mobile Overlay & Menu ===== */
.mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.mobile-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 85vw;
    height: 100vh;
    background: var(--color-bg-secondary);
    z-index: 1200;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--color-border);
}

.mobile-menu.open {
    transform: translateX(0);
}

.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
}

.mobile-menu-logo {
    height: 28px;
    width: auto;
    opacity: 0.8;
}

.mobile-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.3s;
}

.mobile-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.mobile-links {
    list-style: none;
    padding: 16px;
    flex: 1;
}

.mobile-link {
    display: block;
    padding: 14px 16px;
    color: var(--color-text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.25s ease;
    text-decoration: none;
}

.mobile-link:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.mobile-link.active {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.mobile-actions {
    padding: 0 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-mobile {
    width: 100%;
    justify-content: center;
    padding: 12px 20px;
    font-size: 14px;
}

.mobile-menu-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.mobile-menu-footer span {
    font-size: 11px;
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* ===== Responsive Nav ===== */
@media (max-width: 900px) {
    .nav-container {
        display: flex;
        justify-content: space-between;
        padding: 0 20px;
    }

    .nav-center {
        display: none;
    }

    .nav-actions {
        display: none;
    }

    .nav-right {
        margin-left: auto;
    }

    .hamburger {
        display: flex;
    }

    .nav-brand-sub {
        display: none;
    }
}

@media (min-width: 901px) {
    .mobile-overlay,
    .mobile-menu {
        display: none !important;
    }
}

/* ===== Footer (matches footer.js HTML) ===== */
.footer-inner {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 48px 0 32px;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

.footer-main {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    height: 32px;
    width: auto;
    margin-bottom: 16px;
    opacity: 0.8;
}

.footer-desc {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.7;
}

.footer-contact {
    text-align: right;
}

.footer-title {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 14px;
    margin-bottom: 10px;
}

.footer-contact-item svg {
    flex-shrink: 0;
    color: var(--color-text-muted);
}

.footer-contact-item a {
    color: var(--color-text-muted);
    transition: color 0.3s;
}

.footer-contact-item a:hover {
    color: var(--color-accent);
}

.footer-divider {
    height: 1px;
    background: var(--color-border);
    margin: 32px 0 24px;
}

.footer-bottom {
    text-align: center;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 13px;
    margin-bottom: 6px;
}

.footer-note {
    color: var(--color-text-muted);
    font-size: 12px;
    opacity: 0.7;
}

.footer-note a {
    color: var(--color-accent);
}

@media (max-width: 768px) {
    .footer-main {
        flex-direction: column;
        gap: 32px;
    }

    .footer-contact {
        text-align: left;
    }

    .footer-contact-item {
        justify-content: flex-start;
    }
}