body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
    overflow-x: hidden;
}

.gradient-bg {
    background: linear-gradient(-45deg, #0f172a, #1e293b, #312e81, #0f172a);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.glass {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-card {
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-field {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 0.75rem;
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

.input-field:focus {
    border-color: #818cf8;
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.1);
    background: rgba(15, 23, 42, 0.8);
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    transition: color 0.3s ease;
}

.input-field:focus + .input-icon {
    color: #818cf8;
}

.floating-label {
    position: absolute;
    left: 3rem;
    top: 1rem;
    color: #94a3b8;
    pointer-events: none;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.input-field:focus ~ .floating-label,
.input-field:not(:placeholder-shown) ~ .floating-label {
    top: -0.6rem;
    left: 0.8rem;
    font-size: 0.75rem;
    color: #818cf8;
    background: #0f172a;
    padding: 0 0.4rem;
}

.submit-btn {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
            to right,
            rgba(255,255,255,0) 0%,
            rgba(255,255,255,0.3) 50%,
            rgba(255,255,255,0) 100%
    );
    transform: rotate(30deg);
    transition: all 0.6s;
    opacity: 0;
}

.submit-btn:hover::after {
    animation: shimmer 0.6s ease-out;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) rotate(30deg); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateX(100%) rotate(30deg); opacity: 0; }
}

.ticket-card {
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.ticket-card:hover {
    transform: translateY(-4px);
    border-color: rgba(129, 140, 248, 0.5);
}

.ticket-card.selected {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.1);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.ticket-card.selected::before {
    content: '✓';
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 1.5rem;
    height: 1.5rem;
    background: #6366f1;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: white;
}

/* 论坛选择卡片样式 */
.forum-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.forum-card:hover {
    transform: translateY(-2px);
    border-color: rgba(129, 140, 248, 0.4);
    box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.3);
}

.forum-card.selected {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.15);
    box-shadow: 0 0 25px rgba(99, 102, 241, 0.25), inset 0 0 0 1px rgba(99, 102, 241, 0.5);
}

.forum-card.selected .forum-icon {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    transform: scale(1.1);
}

.forum-card.selected .forum-check {
    opacity: 1;
    transform: scale(1);
}

.forum-icon {
    transition: all 0.3s ease;
}

.forum-check {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 1.75rem;
    height: 1.75rem;
    background: #10b981;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    z-index: 10;
}

.forum-check svg {
    width: 1rem;
    height: 1rem;
    color: white;
}

/* 选中时的光效 */
.forum-card.selected::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.2), transparent 70%);
    pointer-events: none;
}

/* 住宿信息卡片样式 */
.stay-info-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.nights-badge {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    box-shadow: 0 4px 15px -3px rgba(99, 102, 241, 0.4);
}

.date-error {
    animation: shake 0.5s ease-in-out;
    border-color: #ef4444 !important;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}


#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.success-checkmark {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: block;
    stroke-width: 2;
    stroke: #fff;
    stroke-miterlimit: 10;
    margin: 0 auto;
    box-shadow: inset 0px 0px 0px #10b981;
    animation: fill .4s ease-in-out .4s forwards, scale .3s ease-in-out .9s both;
}

.checkmark__circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 2;
    stroke-miterlimit: 10;
    stroke: #10b981;
    fill: none;
    animation: stroke 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark__check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: stroke 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke {
    100% { stroke-dashoffset: 0; }
}

@keyframes scale {
    0%, 100% { transform: none; }
    50% { transform: scale3d(1.1, 1.1, 1); }
}

@keyframes fill {
    100% { box-shadow: inset 0px 0px 0px 30px #10b981; }
}

.loader {
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top: 3px solid white;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 参会人员卡片动画 */
.attendee-card {
    animation: slideIn 0.3s ease-out;
    transition: all 0.3s ease;
}

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

.attendee-card.removing {
    animation: slideOut 0.3s ease-in forwards;
}

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* 数字输入框样式 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.quantity-btn {
    transition: all 0.2s;
}

.quantity-btn:hover {
    background: rgba(99, 102, 241, 0.2);
}

.quantity-btn:active {
    transform: scale(0.95);
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0f172a;
}
::-webkit-scrollbar-thumb {
    background: #334155;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #475569;
}