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

[hidden] {
    display: none !important;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--bg-base);
    transition: background-color 0.6s var(--transition-smooth);
}

body {
    width: 100%;
    min-height: 100vh;
    font-family: var(--font-sans);
    letter-spacing: 0.04em;
    background-color: transparent;
    color: var(--text-primary);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    transition: color 0.6s var(--transition-smooth);
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent-flame);
    color: #fff;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 99px;
    border: 3px solid var(--bg-base);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--accent-flame);
    outline-offset: 3px;
    border-radius: 6px;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    color: inherit;
    cursor: pointer;
}

.heading-massive {
    font-family: var(--font-serif);
    font-size: clamp(2.8rem, 6vw, 4.8rem);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.heading-large {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.label-micro {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    white-space: nowrap;
}

.text-body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.glow {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 120vmax;
    height: 120vmax;
    margin: -60vmax 0 0 -60vmax;
    z-index: -1;
    pointer-events: none;
    filter: blur(90px);
    transition: opacity 0.8s var(--transition-smooth);
}

body.dark-mode .glow {
    opacity: 0.45;
}

body.light-mode .glow {
    opacity: 0.24;
}

.glow-a {
    background:
        radial-gradient(38vmax at 30% 30%, var(--accent-flame-soft), transparent 70%),
        radial-gradient(42vmax at 74% 68%, var(--accent-iris-soft), transparent 70%);
    animation: glow-drift-a 46s ease-in-out infinite alternate;
}

.glow-b {
    background:
        radial-gradient(40vmax at 68% 28%, var(--accent-iris-soft), transparent 70%),
        radial-gradient(36vmax at 30% 72%, var(--accent-flame-soft), transparent 70%);
    animation: glow-drift-b 58s ease-in-out infinite alternate-reverse;
}

@keyframes glow-drift-a {
    0% {
        transform: translate3d(-6vmax, -4vmax, 0) rotate(-4deg) scale(1);
    }
    50% {
        transform: translate3d(7vmax, 5vmax, 0) rotate(6deg) scale(1.1);
    }
    100% {
        transform: translate3d(-5vmax, 3vmax, 0) rotate(-2deg) scale(1.04);
    }
}

@keyframes glow-drift-b {
    0% {
        transform: translate3d(5vmax, 6vmax, 0) rotate(5deg) scale(1.06);
    }
    50% {
        transform: translate3d(-7vmax, -3vmax, 0) rotate(-6deg) scale(1.12);
    }
    100% {
        transform: translate3d(4vmax, -5vmax, 0) rotate(3deg) scale(1.02);
    }
}

.header {
    position: fixed;
    top: 2rem;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: 96%;
    max-width: 1600px;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
}

.header > * {
    pointer-events: auto;
}

.header-brand-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-pill,
.control-pill {
    background: var(--pill-bg);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border: 1px solid var(--pill-border);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s var(--transition-smooth);
    box-shadow: var(--shadow-expressive);
    white-space: nowrap;
    flex-shrink: 0;
}

.logo-pill {
    padding: 0.8rem 1.8rem;
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.1em;
}

.control-pill {
    padding: 0.8rem 1.4rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 700;
    gap: 0.5rem;
    cursor: pointer;
}

.theme-toggle-btn {
    width: 48px;
    height: 48px;
    padding: 0;
}

.logo-pill:hover,
.control-pill:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px) scale(1.02);
}

.controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.material-symbols-rounded {
    font-size: 1.3rem !important;
    line-height: 1;
    display: inline-block;
    user-select: none;
    flex-shrink: 0;
}

.custom-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border: 1px solid var(--border-base);
    border-radius: 24px;
    width: 180px;
    list-style: none;
    opacity: 0;
    pointer-events: none;
    transform: translateY(15px) scale(0.95);
    transition: all 0.4s var(--transition-smooth);
    z-index: 200;
    overflow: hidden;
    box-shadow: var(--shadow-expressive);
    padding: 0.5rem;
}

.custom-dropdown.active .dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.dropdown-menu li {
    padding: 0.9rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 16px;
    transition: background 0.2s;
}

.dropdown-menu li:hover {
    background: var(--text-primary);
    color: var(--bg-base);
}

body[data-lang="en"] #lang-menu li[data-lang="en"],
body[data-lang="zh_hans"] #lang-menu li[data-lang="zh_hans"],
body[data-lang="zh_hant"] #lang-menu li[data-lang="zh_hant"],
body[data-lang="ja"] #lang-menu li[data-lang="ja"],
body[data-lang="ko"] #lang-menu li[data-lang="ko"],
body[data-lang="ru"] #lang-menu li[data-lang="ru"],
body[data-lang="es"] #lang-menu li[data-lang="es"] {
    background: var(--accent-soft);
}

body.dark-mode .icon-sun {
    display: none !important;
}

body.dark-mode .icon-moon {
    display: inline-block !important;
}

body.light-mode .icon-sun {
    display: inline-block !important;
}

body.light-mode .icon-moon {
    display: none !important;
}

.hub-container {
    padding: 9rem 4% 5rem 4%;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    flex: 1;
    width: 100%;
}

.hub-lead {
    margin-bottom: 4rem;
}

.hub-subtitle {
    margin-top: 1rem;
    max-width: 600px;
}

.hub-lead-compact {
    margin-bottom: 2.5rem;
}

.hub-lead-compact .heading-massive {
    font-size: clamp(1.9rem, 3.5vw, 2.7rem);
}

.hub-lead-compact .hub-subtitle {
    margin-top: 0.4rem;
    font-size: 0.95rem;
}

.hub-lead-compact .status-badge {
    margin-top: 1.2rem;
}

.hub-cta {
    margin-top: 2.5rem;
    width: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1.2rem 3rem;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-base);
    border: none;
    border-radius: var(--radius-pill);
    padding: 1.2rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.4s var(--transition-smooth);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.hub-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-base);
    border-radius: var(--radius-card);
    padding: 3rem;
    background: var(--bg-glass);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    box-shadow: var(--shadow-expressive);
    transition: all 0.4s var(--transition-smooth);
}

.hub-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.hub-card-header {
    border-bottom: 1px solid var(--border-base);
    padding-bottom: 1.5rem;
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hub-card-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    color: var(--accent-iris);
}

.hub-card-locked .hub-card-icon {
    opacity: 0.55;
}

.hub-card-badge {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-base);
    background: rgba(128, 128, 128, 0.08);
    color: var(--text-secondary);
    white-space: nowrap;
}

.hub-card-name {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.hub-card-desc {
    flex: 1;
}

.hub-card-go {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.hub-card-go .material-symbols-rounded {
    font-size: 1.1rem !important;
    transition: transform 0.4s var(--transition-smooth);
}

.hub-card:hover .hub-card-go {
    color: var(--text-primary);
}

.hub-card:hover .hub-card-go .material-symbols-rounded {
    transform: translate(3px, -3px);
    color: var(--accent-flame);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 2rem;
    align-self: flex-start;
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
}

.pulse-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-flame);
    box-shadow: 0 0 0 0 var(--pulse-soft);
    animation: pulse-glow 2s infinite;
    display: inline-block;
    flex-shrink: 0;
}

@keyframes pulse-glow {
    0% {
        box-shadow: 0 0 0 0 var(--pulse-soft);
    }
    70% {
        box-shadow: 0 0 0 10px transparent;
    }
    100% {
        box-shadow: 0 0 0 0 transparent;
    }
}

.page-footer {
    width: 100%;
    padding: 2.5rem 4%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-base);
    margin-top: auto;
    position: relative;
    z-index: 10;
}

.legal-links {
    display: flex;
    gap: 1.5rem;
}

.legal-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.error-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    position: relative;
    z-index: 10;
    min-height: calc(100vh - 200px);
}

.error-content {
    text-align: center;
    max-width: 600px;
}

.error-code {
    font-family: var(--font-serif);
    font-size: clamp(7rem, 15vw, 12rem);
    line-height: 1;
    letter-spacing: -0.05em;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.error-heading {
    font-size: 1.1rem;
}

.error-actions {
    margin-top: 2.5rem;
}

.error-actions .btn-primary {
    width: auto;
    padding: 1rem 2.5rem;
    display: inline-flex;
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-in 0.8s var(--transition-smooth) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@keyframes fade-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .header {
        top: 1.2rem;
        width: 92%;
    }

    .logo-pill {
        padding: 0.6rem 1.2rem;
        font-size: 1.1rem;
    }

    .controls {
        gap: 0.5rem;
    }

    .hide-on-mobile {
        display: none !important;
    }

    .header .control-pill {
        width: 44px;
        height: 44px;
        padding: 0;
        border-radius: 50%;
        justify-content: center;
    }

    .hub-container {
        padding: 7rem 4% 4rem 4%;
    }

    .hub-lead {
        margin-bottom: 2.5rem;
    }

    .hub-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .hub-card {
        padding: 2rem 1.5rem;
        border-radius: 28px;
    }

    .page-footer {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: 2.5rem 6%;
    }

    .legal-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

.auth-container {
    display: flex;
    align-items: center;
}

.auth-user-pill {
    padding: 5px 8px 5px 6px;
    gap: 6px;
}

.user-avatar-disc {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-avatar-initial {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.78rem;
    color: #fff;
}

.dropdown-triangle {
    font-size: 18px;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.account-dropdown-wrapper.active .dropdown-triangle {
    transform: rotate(180deg);
}

.account-dropdown-menu {
    min-width: 268px;
    border-radius: 28px;
}

.account-dropdown-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px 16px;
}

.avatar-disc-medium {
    width: 44px;
    height: 44px;
}

.avatar-disc-medium .user-avatar-initial {
    font-size: 1rem;
}

.avatar-disc-small {
    width: 34px;
    height: 34px;
}

.account-item-name {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--text-primary);
}

.account-item-email {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.account-dropdown-divider {
    height: 1px;
    margin: 6px 8px;
    background: var(--border-base);
}

.account-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 14px;
    border-radius: 18px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    box-sizing: border-box;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease;
}

.account-menu-item .material-symbols-rounded {
    font-size: 19px;
    color: var(--text-secondary);
}

.account-menu-item:hover {
    background: rgba(128, 128, 128, 0.12);
}

.signout-menu-item:hover {
    color: var(--accent-flame);
}

@media (max-width: 900px) {
    .header .auth-user-pill {
        width: auto;
        min-height: 44px;
        padding: 0 14px 0 8px;
        border-radius: 999px;
    }

    .header .auth-user-pill .user-avatar-disc {
        width: 30px;
        height: 30px;
    }
}