:root {
    --primary: #667eea;
    --primary-dark: #5a71d4;
    --success: #07c160;
    --danger: #ed4014;
    --warning: #ff9f43;
    --text-dark: #333;
    --text-gray: #999;
    --bg-light: #f5f6fa;
    --border-color: #eee;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    color: var(--text-dark);
    background: var(--bg-light);
    line-height: 1.5;
}

a {
    color: inherit;
    text-decoration: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    text-align: center;
    transition: all 0.3s;
}

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

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

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}

.btn-block {
    display: block;
    width: 100%;
}

.page {
    min-height: 100vh;
    padding-bottom: 70px;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 15px;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

.form-group input::placeholder {
    color: var(--text-gray);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    display: flex;
    padding: 8px 0;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    z-index: 100;
}

.nav-btn {
    flex: 1;
    text-align: center;
    padding: 5px 0;
    cursor: pointer;
}

.nav-btn .icon {
    font-size: 22px;
    display: block;
    margin-bottom: 3px;
}

.nav-btn .label {
    font-size: 11px;
    color: var(--text-gray);
}

.nav-btn.active {
    color: var(--primary);
}

.nav-btn.active .label {
    color: var(--primary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-gray);
}

.empty-state .icon {
    font-size: 60px;
    margin-bottom: 15px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-gray);
}

@media (max-width: 768px) {
    .page {
        padding-bottom: 80px;
    }
}

@media (min-width: 769px) {
    .page {
        max-width: 750px;
        margin: 0 auto;
        background: #fff;
    }

    .bottom-nav {
        max-width: 750px;
        left: 50%;
        transform: translateX(-50%);
    }
}