/* ===== CSS变量 ===== */
:root {
    --primary: #6C3CE1;
    --primary-light: #8B5CF6;
    --primary-dark: #4F46E5;
    --secondary: #EC4899;
    --accent: #06B6D4;
    --gradient-main: linear-gradient(135deg, #6C3CE1 0%, #EC4899 50%, #F59E0B 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.02) 100%);
    --bg-dark: #0A0A0F;
    --bg-card: rgba(255,255,255,0.03);
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255,255,255,0.6);
    --text-muted: rgba(255,255,255,0.3);
    --border-glass: rgba(255,255,255,0.06);
    --shadow-glow: 0 0 40px rgba(108, 60, 225, 0.08);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.02);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

    ::-webkit-scrollbar-thumb:hover {
        background: var(--primary-light);
    }

/* ===== 毛玻璃基座 ===== */
.glass {
    background: var(--gradient-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glow);
}

/* ===== 渐变文字 ===== */
.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 渐变按钮 ===== */
.btn-gradient {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 50px;
    background: var(--gradient-main);
    background-size: 200% 200%;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(108, 60, 225, 0.2);
}

    .btn-gradient:hover {
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 8px 40px rgba(108, 60, 225, 0.3);
        background-position: 100% 100%;
    }

    .btn-gradient:active {
        transform: scale(0.97);
    }

/* ===== 高级卡片 ===== */
.card-advanced {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    overflow: hidden;
}

    .card-advanced::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 2px;
        background: var(--gradient-main);
        opacity: 0;
        transition: opacity 0.4s ease;
    }

    .card-advanced:hover {
        transform: translateY(-8px) scale(1.01);
        border-color: rgba(108, 60, 225, 0.15);
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    }

        .card-advanced:hover::before {
            opacity: 1;
        }

/* ===== 输入框 ===== */
.input-advanced {
    width: 100%;
    padding: 0.9rem 1.2rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    background: rgba(255,255,255,0.03);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    outline: none;
}

    .input-advanced:focus {
        border-color: var(--primary);
        box-shadow: 0 0 0 4px rgba(108, 60, 225, 0.1);
    }

    .input-advanced::placeholder {
        color: var(--text-muted);
    }

/* ===== 导航栏高级版 ===== */
.nav-advanced {
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(40px);
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.6rem 0;
}

    .nav-advanced .nav-link {
        color: var(--text-secondary);
        font-weight: 500;
        transition: all 0.3s ease;
        position: relative;
        padding: 0.5rem 1.2rem;
        border-radius: 50px;
    }

        .nav-advanced .nav-link:hover {
            color: #fff;
            background: rgba(255,255,255,0.04);
        }

        .nav-advanced .nav-link::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--gradient-main);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }

        .nav-advanced .nav-link:hover::after {
            width: 60%;
        }

    .nav-advanced .nav-brand {
        font-size: 1.3rem;
        font-weight: 700;
        background: var(--gradient-main);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-advanced .nav-link::after {
        display: none;
    }

    .card-advanced:hover {
        transform: translateY(-4px);
    }
}