:root {
    --primary-color: #0f172a;
    --primary-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --secondary-color: #f8fafc;
    --accent-color: #3b82f6;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --success-color: #22c55e;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(255, 255, 255, 0.2);
    --blur-effect: blur(10px);
    --gradient-bg: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    --card-border: 1px solid rgba(15, 23, 42, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--gradient-bg);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.container {
    background: var(--glass-bg);
    backdrop-filter: var(--blur-effect);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    border: var(--card-border);
    box-shadow: 
        0 4px 6px -1px rgba(15, 23, 42, 0.1),
        0 2px 4px -2px rgba(15, 23, 42, 0.05);
    width: 100%;
    max-width: 500px;
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    margin-bottom: 2rem;
    letter-spacing: -0.025em;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

h1::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: var(--blur-effect);
    padding: 0.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: var(--card-border);
}

.tab {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: -0.01em;
}

.tab.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 
        0 4px 6px -1px rgba(15, 23, 42, 0.1),
        0 2px 4px -2px rgba(15, 23, 42, 0.05);
}

.wifi-info {
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards 0.2s;
}

h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.info-box {
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: var(--blur-effect);
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    border: var(--card-border);
    transition: var(--transition);
}

.info-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

p {
    color: var(--text-secondary);
    font-size: 1rem;
    word-break: break-all;
}

.copy-btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 12px;
    background: var(--primary-gradient);
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
    letter-spacing: -0.01em;
    box-shadow: 
        0 4px 6px -1px rgba(15, 23, 42, 0.1),
        0 2px 4px -2px rgba(15, 23, 42, 0.05);
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(15, 23, 42, 0.2);
}

.qr-container {
    margin-top: 2.5rem;
    text-align: center;
    padding: 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: var(--blur-effect);
    border-radius: var(--border-radius);
    border: var(--card-border);
    position: relative;
}

#qrcode-2g, #qrcode-5g {
    display: inline-block;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    position: relative;
    transition: var(--transition);
}

#qrcode-2g:hover, #qrcode-5g:hover {
    transform: scale(1.02);
}

#qrcode-2g img, #qrcode-5g img {
    border-radius: 8px;
    padding: 8px;
    background: white;
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.08);
}

.qr-scan-hint {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--glass-bg);
    backdrop-filter: var(--blur-effect);
    color: var(--success-color);
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 0.875rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: var(--card-border);
    box-shadow: 
        0 4px 6px -1px rgba(15, 23, 42, 0.1),
        0 2px 4px -2px rgba(15, 23, 42, 0.05);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

@media (max-width: 480px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .tabs {
        padding: 0.25rem;
    }

    .tab {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
}