.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06), 0 0 1px rgba(0, 0, 0, 0.08);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease, box-shadow 0.3s ease, top 0.35s ease, left 0.35s ease, right 0.35s ease, width 0.35s ease, border-radius 0.35s ease;
}

.navbar.navbar-hidden {
    transform: translateY(calc(-100% - 16px));
}

.navbar.navbar-scrolled {
    top: 10px;
    left: 16px;
    right: 16px;
    width: auto;
    border-radius: var(--radius-full, 99px);
    background: rgba(255, 255, 255, 0.82);
    box-shadow: 0 4px 32px rgba(0, 0, 0, 0.1), 0 0 1px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.nav-container {
    width: 100%;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.nav-logo-main {
    height: 40px;
    width: auto;
}

.nav-logo-secondary {
    height: 40px;
    width: auto;
}

@media (max-width: 576px) {
    .nav-logo-secondary {
        display: none;
    }
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-menu-inner {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--color-text-gray);
    text-decoration: none;
    font-weight: var(--font-medium);
    transition: all 0.3s ease;
    padding: 8px 0;
    font-size: var(--text-md);
}

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

.nav-title {
    display: none;
}

.dropdown-toggle::after {
    content: '▼';
    margin-left: 8px;
    font-size: var(--text-xs);
    transition: transform 0.3s ease;
}

.dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    min-width: 200px;
    border-radius: var(--radius-lg, 16px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    padding: 8px 0;
    margin-top: 8px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-link {
    display: block;
    color: var(--color-text-body);
    text-decoration: none;
    padding: 12px 20px;
    transition: all 0.2s ease;
    border-radius: var(--radius-sm, 8px);
    margin: 2px 8px;
}

.dropdown-link:hover {
    background: rgba(147, 51, 234, 0.08);
    color: var(--color-brand);
    padding-left: 24px;
}

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

.nav-login-btn {
    display: none;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.btn.nav-login-btn {
    font-size: var(--text-sm);
    padding: 8px 16px;
}

.nav-login-btn svg {
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1.5px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-full, 999px);
    cursor: pointer;
    padding: 8px 16px;
    transition: all 0.3s ease;
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(0, 0, 0, 0.15);
}

.nav-toggle-icon {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 16px;
}

.nav-toggle-icon span {
    width: 16px;
    height: 2px;
    background: var(--color-text-body, #334155);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
    display: block;
}

.nav-toggle-label {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-body);
    transition: all 0.3s ease;
}

@media (max-width: 576px) {
    .nav-toggle-label {
        display: none;
    }

    .nav-toggle {
        padding: 10px;
    }
}

.nav-toggle.active .nav-toggle-icon span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4.5px);
}

.nav-toggle.active .nav-toggle-icon span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle.active .nav-toggle-icon span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4.5px);
}

.login-card-mobile {
    display: none;
}

.nav-menu-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0.75) 100%);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-menu-backdrop.active {
    display: block;
    opacity: 1;
}

.signup-item--mobile-login {
    display: none;
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 12px;
        right: 12px;
        width: auto;
        max-height: calc(100vh - 92px);
        background: #fff;
        border-radius: var(--radius-xl, 20px);
        box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.08);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        padding: 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-16px) scale(0.98);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
    }

    .nav-menu-inner {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 16px 20px 32px;
    }

    .nav-item {
        border-bottom: 1px solid var(--color-border-light, rgba(0, 0, 0, 0.06));
    }

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-link {
        color: var(--color-text-gray-dark);
        display: block;
        padding: 16px 12px;
        font-size: var(--text-lg);
        font-weight: var(--font-medium);
        border-radius: var(--radius-md, 12px);
        transition: all 0.2s ease;
    }

    .nav-title {
        color: var(--color-brand);
        display: block;
        padding: 8px 12px;
        font-size: var(--text-base);
        font-weight: var(--font-light);
        transition: all 0.2s ease;
        border-bottom: 1px solid var(--color-border-light, rgba(0, 0, 0, 0.06));
    }

    .nav-link:hover,
    .nav-link:active {
        background: rgba(147, 51, 234, 0.08);
        color: var(--color-brand);
    }

    .nav-toggle {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(0, 0, 0, 0.03);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border: none;
        border-radius: var(--radius-md, 12px);
        margin: 4px 0 8px;
        padding: 4px;
    }

    .dropdown-link {
        color: var(--color-text-gray);
        text-align: left;
        padding: 12px 16px;
        border-radius: 10px;
        margin: 2px 0;
    }

    .dropdown-link:hover {
        background: rgba(147, 51, 234, 0.06);
        color: var(--color-brand);
        padding-left: 20px;
    }

    .login-item {
        display: none;
        margin-top: 8px;
        text-align: center;
    }

    .signup-item {
        margin-top: 8px;
        text-align: center;
    }

    .signup-item--mobile-login {
        display: block;
    }

    .signup-item .btn {
        display: block;
        width: 100%;
        text-align: center;
        border-radius: 14px;
        padding: 14px 24px;
        font-size: var(--text-lg);
    }

    .nav-login-btn {
        display: inline-flex;
        padding: 8px 12px;
        border-radius: var(--radius-md, 12px);
    }

    .login-card-mobile {
        display: block;
        margin-top: 12px;
        border-bottom: none;
    }

    .login-card {
        background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 40%, #fdf2f8 100%);
        border-radius: 18px;
        padding: 24px 20px;
        text-align: center;
        border: 1px solid rgba(147, 51, 234, 0.1);
        box-shadow: 0 2px 12px rgba(147, 51, 234, 0.08);
    }

    .login-card-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        background: rgba(147, 51, 234, 0.1);
        border-radius: 18px;
        color: var(--color-brand);
        margin-bottom: 12px;
    }

    .login-card-title {
        font-size: var(--text-base);
        font-weight: var(--font-light);
        color: var(--color-text-gray-dark);
        margin-bottom: 16px;
    }

    .login-card-desc {
        font-size: var(--text-sm);
        font-weight: var(--font-normal);
        color: var(--color-text-gray);
        margin-bottom: 16px;
        line-height: var(--leading-tight, 1.4);
    }

    .login-card .btn {
        width: 100%;
        padding: 12px 24px;
        font-size: var(--text-lg);
        font-weight: var(--font-semibold);
    }
}

/* 手機版底部懸浮登入按鈕 */
.mobile-floating-login {
    display: none;
}

@media (max-width: 768px) {
    .mobile-floating-login {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 997;
        padding: 12px 16px;
        padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
        background: linear-gradient(to top, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0) 100%);
        pointer-events: none;
    }

    .mobile-floating-login-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: fit-content;
        margin: 0 auto;
        padding: 8px 16px;
        background: var(--gradient-brand, linear-gradient(135deg, #9333ea 0%, #ec4899 50%, #f97316 100%));
        color: var(--color-text-white);
        font-size: var(--text-sm);
        font-weight: var(--font-semibold);
        border-radius: var(--radius-full, 99px);
        text-decoration: none;
        box-shadow: 0 4px 20px rgba(147, 51, 234, 0.35), 0 2px 8px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
        pointer-events: auto;
    }

    .mobile-floating-login-btn:hover,
    .mobile-floating-login-btn:active {
        transform: translateY(-2px);
        box-shadow: 0 6px 28px rgba(147, 51, 234, 0.45), 0 4px 12px rgba(0, 0, 0, 0.15);
    }

    .mobile-floating-login-btn svg {
        flex-shrink: 0;
    }
}