:root {
    --bg-color: #f6f4ef;
    --sidebar-bg-color: #f2f3f4;
    --text-color: black;
    --link-color: black;
    --link-hover-color: black;
    --active-link-bg-color: black;
    --active-link-text-color: #fff;
    --box-shadow-color: rgba(0, 0, 0, 0.1);
    --nav-item-bg-color: white;

    /* Define transition duration */
    --transition-duration: 0.3s;
}

.dark-mode {
    --bg-color: #121212;
    --sidebar-bg-color: #333;
    --text-color: #fff;
    --link-color: #fff;
    --link-hover-color: #ddd;
    --active-link-bg-color: #fff;
    --active-link-text-color: black;
    --box-shadow-color: rgba(255, 255, 255, 0.1);
    --nav-item-bg-color: #444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

html, body {
    height: 100%;
    overscroll-behavior-y: none;
    overflow-x: hidden;
}

body {
    display: flex;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-duration), color var(--transition-duration); /* Use variable */
}

/* Sidebar layout - position and size */
.sidebar {
    width: calc(100% / 7);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
}

/* Main content wrapper layout - position and size */
.main-content-wrapper {
    width: calc(100% * 6 / 7);
    margin-left: calc(100% / 7);
    padding: 40px;
    padding-bottom: 60px; /* Fallback for older browsers */
    padding-bottom: max(60px, 5vh); /* Modern browsers with viewport-relative spacing */
    box-sizing: border-box;
    background-color: #f6f4ef; /* Fallback for older browsers */
    background-color: var(--bg-color);
    -webkit-transition: background-color 0.3s; /* Webkit prefix for older Safari */
    -moz-transition: background-color 0.3s; /* Firefox prefix for older versions */
    -o-transition: background-color 0.3s; /* Opera prefix for older versions */
    transition: background-color 0.3s; /* Fallback duration */
    transition: background-color var(--transition-duration); /* Use variable */
    min-height: 100vh; /* Ensure full viewport coverage */
}


.content-header {
    position: relative;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.title {
    position: relative;
    z-index: 1;
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 30px;
}

/* 以下是开关组件样式，主要用于深色模式切换和 Activity 页面的筛选器 */
.switch-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    gap: 10px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: black;
}

input:checked+.slider:before {
    transform: translateX(26px);
}

.switch-label {
    font-size: 14px;
    font-family: "ヒラギノ明朝 ProN", "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;
    color: var(--text-color);
}

/* 深色模式切换按钮，仅用于深色模式功能 */
#dark-mode-toggle {
    position: absolute;
    z-index: 100;
    top: 15px;
    right: 20px;
    width: auto;
    height: auto;
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
    color: var(--text-color);
    transition: color var(--transition-duration); /* Use variable */
}

#dark-mode-toggle[data-mode="light"]::before {
    content: "⏾";
}

#dark-mode-toggle[data-mode="dark"]::before {
    content: "☀︎";
}


/* 导航高亮相关样式 */
.sidebar nav a.active {
    background-color: #000;
    color: #fff;
}


.sidebar-nav-item a:hover {
    text-decoration: underline;
    color: var(--link-hover-color);
}

.sidebar-nav-item a.active {
    color: var(--active-link-text-color);
    background-color: var(--active-link-bg-color);
    border-radius: 5px;
}

.footer {
    font-size: 12px;
    text-align: center;
    margin-top: 20px;
    color: var(--text-color);
}

@media (max-width: 767px) {
    html,
    body {
        overflow-y: auto;
        height: auto;
    }

    .main-content-wrapper {
        width: 95%;
        margin-left: auto;
        margin-right: auto;
        padding: 80px 20px 80px 20px; /* Fallback for older browsers */
        padding: 80px 20px max(80px, 8vh) 20px; /* Mobile bottom padding that scales with viewport height */
        min-height: 100vh; /* Use min-height instead of fixed height */
        /* iOS Safari specific fixes */
        min-height: -webkit-fill-available; /* iOS Safari viewport fix */
        overflow: visible; /* Allow page-level scrolling instead of wrapper scrolling */
        -webkit-overflow-scrolling: touch; /* iOS smooth scrolling */
        box-sizing: border-box;
        /* Samsung Internet and Chrome Mobile fixes */
        -webkit-transform: translateZ(0); /* Force hardware acceleration */
        transform: translateZ(0);
    }

    #dark-mode-toggle {
        position: absolute;
        top: 15px;
        right: 20px;
    }
}

/* Large desktop screens */
@media (min-width: 1440px) {
    .main-content-wrapper {
        padding-bottom: 80px; /* Fallback for older browsers */
        padding-bottom: max(80px, 6vh); /* Extra spacing for large screens */
    }
}

/* Standard desktop screens */
@media (min-width: 1025px) and (max-width: 1439px) {
    .main-content-wrapper {
        padding-bottom: 60px; /* Fallback for older browsers */
        padding-bottom: max(60px, 5vh); /* Desktop bottom spacing that scales with viewport height */
    }
}

/* Small mobile screens */
@media (max-width: 375px) {
    .main-content-wrapper {
        padding: 80px 15px 90px 15px; /* Fallback for older browsers */
        padding: 80px 15px max(90px, 10vh) 15px; /* Extra spacing for very small screens */
    }
}

@media (max-width: 1200px) {
    .main-content {
        padding: 20px;
    }

}

@media (min-width: 768px) and (max-width: 1024px) {
    .sidebar {
        width: calc(100% / 7);
        position: fixed;
        height: 100vh;
    }

    .main-content-wrapper {
        width: calc(100% * 6 / 7);
        margin-left: calc(100% / 7);
        padding-bottom: 70px; /* Fallback for older browsers */
        padding-bottom: max(70px, 6vh); /* Tablet-specific bottom spacing that scales with viewport height */
    }

    .hamburger {
        display: none;
    }

    nav {
        display: block !important;
    }

    .sidebar-nav {
        flex-direction: column;
    }

    .sidebar-nav-item {
        margin-bottom: 15px;
    }

    .footer {
        position: static;
        margin-top: 20px;
        padding: 0;
    }

}

/* 移动端特定样式 */
@media (max-width: 767px) {
    .sidebar {
        width: 100%;
        position: fixed;
        height: 60px;
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
        padding: 0 20px;
    }

    .logo-text {
        margin-bottom: 0;
        text-align: left;
        display: block;
    }

    .hamburger {
        display: flex;
    }

    nav {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: var(--sidebar-bg-color);
        flex-direction: column;
        padding: 20px 0;
        z-index: 999;
    }

    nav.active {
        display: flex;
    }

    .main-content-wrapper {
        width: 95%;
        margin-left: auto;
        margin-right: auto;
        padding-top: 80px;
        height: 100vh;
        /* iOS Safari specific viewport fixes */
        height: -webkit-fill-available;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch; /* iOS smooth scrolling */
        box-sizing: border-box;
        /* Chrome Mobile and Samsung Internet fixes */
        -webkit-transform: translateZ(0); /* Force hardware acceleration */
        transform: translateZ(0);
    }


    .footer {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        padding: 10px;
        background-color: var(--sidebar-bg-color);
        z-index: 999;
        text-align: center;
    }

    .sidebar-nav {
        flex-direction: column;
        align-items: center;
    }

    .sidebar-nav-item {
        margin-bottom: 15px;
    }

    /* 移动端导航项目高亮样式 */
    .sidebar-nav-item a.active {
        background-color: black;
        color: white;
        padding: 10px 20px;
        border-radius: 0;
    }
}

/* Mobile browser-specific fixes */

/* iOS Safari specific fixes */
@supports (-webkit-touch-callout: none) {
    .main-content-wrapper {
        /* Fix for iOS Safari viewport height issues */
        min-height: -webkit-fill-available;
    }
    
    @media (max-width: 767px) {
        .main-content-wrapper {
            /* iOS Safari specific bottom spacing */
            padding-bottom: max(80px, env(safe-area-inset-bottom, 8vh));
            /* Account for home indicator on newer iPhones */
            padding-bottom: max(80px, calc(8vh + env(safe-area-inset-bottom, 0px)));
        }
    }
}

/* Chrome Mobile and Samsung Internet fixes */
@media screen and (-webkit-min-device-pixel-ratio: 0) and (max-width: 767px) {
    .main-content-wrapper {
        /* Chrome Mobile specific fixes */
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
        /* Ensure proper rendering on Chrome Mobile */
        will-change: transform;
    }
}

/* Samsung Internet specific fixes */
@media screen and (-webkit-min-device-pixel-ratio: 0) {
    .main-content-wrapper {
        /* Samsung Internet viewport calculation fixes */
        min-height: 100vh;
        min-height: calc(var(--vh, 1vh) * 100);
    }
}

/* Firefox Mobile fixes */
@-moz-document url-prefix() {
    @media (max-width: 767px) {
        .main-content-wrapper {
            /* Firefox Mobile specific spacing */
            padding-bottom: 80px;
            min-height: 100vh;
        }
    }
}