/* 共用樣式 - 綠色主題 */
:root {
    /* Color System - Green Theme */
    --primary-green: #2d5016;
    --primary-green-light: #4a7c2c;
    --accent-green: #7cb342;
    --accent-orange: #ff9800;
    --neutral-gray: #8d6e63;
    --neutral-light: #f5f5f5;
    --white: #ffffff;
    --danger: #dc3545;
    --success: #28a745;
    
    /* Typography */
    --font-sans: 'Noto Sans TC', sans-serif;
    --font-serif: 'Noto Serif TC', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

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

body {
    font-family: var(--font-sans);
    color: #333;
    line-height: 1.6;
}

/* 導航欄 */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-green);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-green);
}

.btn-primary {
    background: var(--primary-green);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: var(--primary-green-light);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(45, 80, 22, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--primary-green);
    padding: 0.75rem 2rem;
    border-radius: 50px;
    border: 2px solid var(--primary-green);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--primary-green);
    color: white;
}

/* 表單樣式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(45, 80, 22, 0.1);
}

.form-control.error {
    border-color: var(--danger);
}

.form-text {
    font-size: 0.875rem;
    color: #666;
    margin-top: 0.25rem;
}

.error-message {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
}

.error-message.show {
    display: block;
}

/* 卡片 */
.card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

.card-header {
    background: var(--primary-green);
    color: white;
    padding: 1.5rem;
    text-align: center;
}

.card-body {
    padding: 2rem;
}

/* 提示訊息 */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: none;
}

.alert.show {
    display: block;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Loading 動畫 */
.loading {
    display: none;
    text-align: center;
    padding: 2rem;
}

.loading.show {
    display: block;
}

.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-green);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* 頁尾 */
footer {
    background: #1a1a1a;
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

/* 響應式 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
}