/**
 * MatlabCode - Main Stylesheet
 * Modern, Clean, and Beautiful Download Site Design
 */

/* ============================================
   CSS Variables - Color Palette
   ============================================ */
:root {
    --primary-color: #2c3e50;
    --primary-light: #34495e;
    --accent-color: #3498db;
    --accent-hover: #2980b9;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #ecf0f1;
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 14px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-hover);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   Header Styles
   ============================================ */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    box-shadow: var(--shadow-md);
    border-bottom: 3px solid var(--accent-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.headerb {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

.header .logo .login_title {
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 1px;
    transition: var(--transition);
}

.header .logo .login_title:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
}

.topright {
    display: flex;
    align-items: center;
    gap: 30px;
}

/* Navigation Styles */
.header .nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.header .nav .navlist {
    display: flex;
    align-items: center;
    gap: 5px;
}

.header .nav .navlist li {
    position: relative;
}

.header .nav .navlist li a {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    padding: 10px 18px;
    display: block;
    transition: var(--transition);
    border-radius: var(--radius-sm);
    font-size: 15px;
}

.header .nav .navlist li a:hover,
.header .nav .navlist li.hover a {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.15);
}

/* Dropdown Menu Styles - Fixed */
.header .nav .navlist li {
    position: relative;
}

.header .nav .navlist li .subnav {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    margin-top: 10px;
    padding: 8px 0;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    pointer-events: none;
}

.header .nav .navlist li:hover .subnav,
.header .nav .navlist li.hover .subnav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.header .nav .navlist li .subnav a {
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 0;
    margin: 0;
    display: block;
    font-size: 14px;
    white-space: nowrap;
}

.header .nav .navlist li .subnav a:hover {
    background-color: var(--bg-secondary);
    color: var(--accent-color);
    padding-left: 24px;
}

/* User Menu Styles */
.header .user ul {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header .user ul li {
    display: inline-block;
}

.header .user ul li a {
    color: rgba(255, 255, 255, 0.9);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 14px;
    display: block;
}

.header .user ul li a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

.header .user ul li.log a,
.header .user ul li.reg a {
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.header .user ul li.log a:hover,
.header .user ul li.reg a:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Search Navigation Banner
   ============================================ */
.home-filter--content {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    padding: 60px 20px;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.home-filter--content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('/static/index/img/bannersearch.jpg') center/cover;
    opacity: 0.2;
    z-index: 0;
}

.home-filter--content .container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    text-align: center;
}

.home-filter--content .focusbox-title {
    font-size: 36px;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    margin-bottom: 15px;
}

.home-filter--content .focusbox-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 30px;
}

.home-filter--content .form-box {
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-lg);
    padding: 25px;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
}

.home-filter--content .row {
    display: flex;
    gap: 15px;
    align-items: center;
}

.home-filter--content .form-group {
    flex: 1;
}

.home-filter--content .home_search_input {
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    font-size: 16px;
    transition: var(--transition);
    outline: none;
}

.home-filter--content .home_search_input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.home-filter--content .btn {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    border: none;
    border-radius: var(--radius-md);
    padding: 14px 35px;
    font-weight: 600;
    color: #ffffff;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    font-size: 16px;
    white-space: nowrap;
}

.home-filter--content .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   Container & Layout
   ============================================ */
.new_container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    background-color: var(--bg-secondary);
    min-height: calc(100vh - 300px);
}

.new_part {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.new_part_left {
    flex: 1;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
}

.new_part_right {
    width: 300px;
    flex-shrink: 0;
}

.dl_position {
    padding-bottom: 15px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--bg-tertiary);
}

.dl_position h2 {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 400;
}

.dl_position h2 a {
    color: var(--accent-color);
    font-weight: 500;
}

.new_part_left h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--accent-color);
}

/* ============================================
   Sidebar Styles
   ============================================ */
.new_part_right {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.new_part_btn {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 15px;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.new_part_btn img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.new_part_btn img:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.new_part_rightcontad {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

/* Hot Tags Styles */
.tags {
    margin-bottom: 25px;
}

.tags img {
    width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: 15px;
}

#tagscloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

#tagscloud a {
    display: inline-block;
    padding: 6px 12px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    border: 1px solid var(--border-color);
}

#tagscloud a:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

#tagscloud a.tagc1 {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

#tagscloud a.tagc2 {
    background-color: var(--danger-color);
    color: #ffffff;
    border-color: var(--danger-color);
}

#tagscloud a.tagc5 {
    background-color: var(--success-color);
    color: #ffffff;
    border-color: var(--success-color);
}

/* Hot Articles Styles */
.new_part_rightcont4 {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}

.new_part_rightcont4 .newscont ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.new_part_rightcont4 .newscont ul li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.new_part_rightcont4 .newscont ul li:last-child {
    border-bottom: none;
}

.new_part_rightcont4 .newscont ul li:hover {
    padding-left: 8px;
}

.new_part_rightcont4 .newscont ul li a {
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.new_part_rightcont4 .newscont ul li a:hover {
    color: var(--accent-color);
}

/* ============================================
   Footer Styles
   ============================================ */
.footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: rgba(255, 255, 255, 0.9);
    padding: 40px 20px 20px;
    margin-top: 60px;
    box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
}

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

.footertd {
    padding: 8px 0;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}

.footertd a {
    color: rgba(255, 255, 255, 0.9);
    margin: 0 8px;
    transition: var(--transition);
}

.footertd a:hover {
    color: var(--accent-color);
}

/* ============================================
   Utility Classes
   ============================================ */
.fl {
    float: left;
}

.fr {
    float: right;
}

.tc {
    text-align: center;
}

.w1200 {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1200px) {
    .headerb {
        padding: 0 15px;
    }
    
    .new_container {
        padding: 20px 15px;
    }
    
    .new_part {
        flex-direction: column;
    }
    
    .new_part_right {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .headerb {
        height: auto;
        padding: 15px;
        flex-wrap: wrap;
    }
    
    .topright {
        width: 100%;
        justify-content: space-between;
        margin-top: 15px;
    }
    
    .header .nav {
        display: none;
    }
    
    .header .logo .login_title {
        font-size: 22px;
    }
    
    .home-filter--content {
        padding: 40px 15px;
    }
    
    .home-filter--content .focusbox-title {
        font-size: 24px;
    }
    
    .home-filter--content .row {
        flex-direction: column;
    }
    
    .home-filter--content .btn {
        width: 100%;
    }
    
    .new_part_left {
        padding: 20px 15px;
    }
}