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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    color: #ffffff;
    padding: 40px 0;
    text-align: center;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.tagline {
    font-size: 14px;
    opacity: 0.9;
}

.main {
    flex: 1;
    padding: 30px 0;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.tab-btn:hover {
    background: var(--primary-color);
    color: #ffffff;
}

.tab-btn.active {
    background: var(--primary-color);
    color: #ffffff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-lg);
}

.card h2 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.desc {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.2s ease;
    background: var(--bg-color);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--secondary-color);
    color: #ffffff;
}

.btn-secondary:hover {
    background: var(--secondary-hover);
}

.result-box {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.result-box input,
.result-box textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    background: var(--bg-color);
    font-family: "Courier New", monospace;
}

.result-box textarea {
    min-height: 80px;
    resize: vertical;
}

.btn-copy {
    padding: 12px 20px;
    background: var(--success-color);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease;
    white-space: nowrap;
}

.btn-copy:hover {
    background: #059669;
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-color);
    color: #ffffff;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

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

.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    text-align: center;
}

.footer p {
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 4px;
}

.footer p:last-child {
    margin-bottom: 0;
}

@media (max-width: 600px) {
    .header {
        padding: 30px 0;
    }

    .logo {
        font-size: 22px;
    }

    .tabs {
        justify-content: center;
    }

    .tab-btn {
        padding: 10px 16px;
        font-size: 14px;
    }

    .card {
        padding: 20px;
    }

    .card h2 {
        font-size: 18px;
    }

    .btn-group {
        justify-content: center;
    }

    .btn {
        padding: 10px 18px;
        font-size: 14px;
    }

    .result-box {
        flex-direction: column;
    }

    .btn-copy {
        width: 100%;
    }
}