/* =====  Petoko 設計系統 - 現代化漸進色系  ===== */
:root {
    /* 主色系 - 溫暖的珊瑚粉漸進色 */
    --primary: #FF6B6B;
    --primary-light: #FF8E8E;
    --primary-dark: #E55555;
    --secondary: #4ECDC4;
    
    /* 輔助色系 - 柔和的薄荷綠 */
    --accent: #F7F9FC;
    --accent-light: #E8F4F8;
    --accent-dark: #D1E7DD;
    
    /* 中性色系 */
    --dark: #2C3E50;
    --text-primary: #2C3E50;
    --text-secondary: #6C757D;
    --text-light: #ADB5BD;
    
    /* 背景色系 */
    --bg-primary: #F8F9FA;
    --bg-secondary: #E9ECEF;
    --bg-tertiary: #F1F3F4;
    --white: #FFFFFF;
    --bg-secondary: #E9ECEF;
    
    /* 陰影系統 */
    --shadow-light: rgba(44, 62, 80, 0.04);
    --shadow-medium: rgba(44, 62, 80, 0.08);
    --shadow-strong: rgba(44, 62, 80, 0.12);
    --shadow-color: rgba(44, 62, 80, 0.1);
    
    /* 漸進色系統 */
    --gradient-primary: linear-gradient(135deg, #FF6B6B, #FF8E8E);
    --gradient-secondary: linear-gradient(135deg, #4ECDC4, #44A08D);
    --gradient-accent: linear-gradient(135deg, #F7F9FC, #E8F4F8);
    --gradient-warm: linear-gradient(135deg, #FFE66D, #FF6B6B);
    --gradient-cool: linear-gradient(135deg, #4ECDC4, #96CEB4);
    
    /* 狀態色系 */
    --success: #51CF66;
    --warning: #FFD43B;
    --error: #FF6B6B;
    --info: #4ECDC4;
    
    /* 邊框色系 */
    --border-color: #E9ECEF;
    --border-light: #F1F3F4;
}

/* 禁用手機版縮放螢幕功能 */
html {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    touch-action: manipulation;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;

}

main {
    padding-bottom: 90px;
}

.modal-container {
    padding-bottom: 100px;
}

/* 頂部區域 - Instagram 風格 */
.app-header {
    background: var(--white);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--bg-secondary);
    box-shadow: 0 1px 3px var(--shadow-light);
}

.app-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-actions {
    display: flex;
    align-items: center;
}

.notification-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    position: relative;
}

.notification-btn:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

.notification-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--primary);
    color: var(--white);
    font-size: 0.6rem;
    font-weight: 600;
    padding: 0.1rem 0.3rem;
    border-radius: 8px;
    min-width: 12px;
    text-align: center;
    line-height: 1;
}

/* 內容容器 */
.content-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 底部導航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    background: var(--white);
    border-top: 1px solid rgba(255, 107, 107, 0.1);
    padding: 0.75rem 0 1rem;
    z-index: 1000;
    box-shadow: 0 -4px 20px var(--shadow-light);
}

.nav-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: relative;
}

/* 為中間兩個按鈕添加特殊間距 */
.nav-item:nth-child(2) {
    margin-right: 2rem;
}

.nav-item:nth-child(4) {
    margin-left: 2rem;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    transition: all 0.3s ease;
    padding: 0.5rem;
    border-radius: 12px;
    min-width: 60px;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary);
    text-decoration: none;
}

.nav-icon {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.nav-text {
    font-size: 0.7rem;
    font-weight: 500;
}

.post-fab {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    box-shadow: 0 6px 20px var(--shadow-medium);
    transition: all 0.3s ease;
}

.post-fab:hover {
    transform: translateX(-50%) translateY(-3px) scale(1.1);
    color: var(--white);
}

/* 通用按鈕樣式 */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-medium);
    color: var(--white);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 卡片樣式 */
.card {
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow-light);
    border: 1px solid var(--bg-secondary);
    overflow: hidden;
}

/* 表單樣式 */
.form-control {
    border: 2px solid var(--bg-secondary);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    background: var(--white);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
    outline: none;
}

/* 響應式設計 */
@media (max-width: 480px) {
    .content-container {
        padding: 0 0.75rem;
    }
    
    .app-header {
        padding: 0.5rem 0;
    }
    
    .app-title {
        font-size: 1.1rem;
    }
}



.back-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    font-size: 1.2rem;
    color: var(--text-primary, #212529);
    cursor: pointer;
    transition: color 0.2s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
}

.back-btn:hover {
    color: var(--primary, #007bff);
    background: var(--bg-light, #f8f9fa);
}