/* ===========================================
   Personal Site Stylesheet
   Tech-Style Three-Column Layout
   One Dark Theme
   =========================================== */

/* Color Variables - One Dark Theme */
:root {
    --color-bg: #282c34;
    --color-bg-secondary: #21252b;
    --color-surface: rgba(33, 37, 43, 0.9);
    --color-surface-hover: rgba(44, 49, 58, 0.95);
    --color-text: #abb2bf;
    --color-text-secondary: #9da5b4;
    --color-text-muted: #5c6370;
    --color-primary: #61afef;
    --color-primary-dark: #528bcc;
    --color-primary-light: rgba(97, 175, 239, 0.15);
    --color-accent: #c678dd;
    --color-accent-2: #56b6c2;
    --color-green: #98c379;
    --color-yellow: #e5c07b;
    --color-red: #e06c75;
    --color-border: rgba(171, 178, 191, 0.1);
    --color-border-hover: rgba(97, 175, 239, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 25px rgba(97, 175, 239, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --sidebar-width: 260px;
    --nav-width: 160px;
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-card: linear-gradient(135deg, rgba(97, 175, 239, 0.08) 0%, rgba(198, 120, 221, 0.04) 100%);
    --gradient-card-hover: linear-gradient(135deg, rgba(97, 175, 239, 0.12) 0%, rgba(198, 120, 221, 0.08) 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Tech Background */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(97, 175, 239, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(97, 175, 239, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
}

.bg-glow-1 {
    width: 600px;
    height: 600px;
    background: rgba(97, 175, 239, 0.07);
    top: -200px;
    right: -100px;
}

.bg-glow-2 {
    width: 500px;
    height: 500px;
    background: rgba(198, 120, 221, 0.05);
    bottom: -150px;
    left: -100px;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: all 0.2s ease;
}

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

/* Page Layout */
.page-layout {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* Left Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-right: 1px solid var(--color-border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-content {
    padding: 48px 24px;
}

.sidebar-name {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.sidebar-title {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.sidebar-contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-item {
    font-size: 13px;
    color: var(--color-text-secondary);
    word-break: break-all;
    padding: 10px 14px;
    background: rgba(97, 175, 239, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: var(--color-primary-light);
    border-color: var(--color-border-hover);
    color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

/* Language Switch - Top Right */
.lang-switch {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.lang-switch a {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.lang-switch a:hover {
    background: var(--color-primary-light);
    border-color: var(--color-border-hover);
    color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    margin-right: var(--nav-width);
    padding: 48px 48px 24px;
    max-width: calc(100% - var(--sidebar-width) - var(--nav-width));
}

/* Right Navigation */
.right-nav {
    width: var(--nav-width);
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    padding: 48px 20px;
    display: flex;
    align-items: center;
}

.nav-list {
    list-style: none;
    border-left: 1px solid var(--color-border);
    padding-left: 16px;
}

.nav-list li {
    margin-bottom: 12px;
}

.nav-link {
    font-size: 13px;
    color: var(--color-text-muted);
    transition: all 0.3s ease;
    display: block;
    padding: 4px 0;
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: -17px;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    background: var(--gradient-primary);
    transition: height 0.3s ease;
}

.nav-link:hover {
    color: var(--color-text-secondary);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 500;
}

.nav-link.active::before {
    height: 20px;
}

/* About Section */
.about-content {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
}

.about-content p {
    margin-bottom: 14px;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* Sections */
.section {
    margin-bottom: 56px;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* Cards */
.cards {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 24px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.5), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    background: var(--gradient-card-hover);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 6px;
}

.card-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
}

.card-title a {
    color: var(--color-text);
}

.card-title a:hover {
    color: var(--color-primary);
}

.card-meta {
    font-size: 12px;
    color: var(--color-text-muted);
    white-space: nowrap;
    padding: 4px 10px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 100px;
}

.card-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 10px;
}

.card-content {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.card-content ul {
    margin-left: 18px;
    margin-top: 6px;
}

.card-content li {
    margin-bottom: 4px;
}

/* Tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
    transition: all 0.2s ease;
}

.tag:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--color-primary);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
}

.skill-category {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    transition: all 0.3s ease;
}

.skill-category:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
}

.skill-category-title {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 13px;
    margin-top: 40px;
}

.visitor-count {
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.visitor-count img {
    vertical-align: middle;
    border-radius: 4px;
}

.footer-qoder {
    margin-top: 6px;
    font-size: 12px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 500;
}

/* Responsive - Tablet */
@media (max-width: 1024px) {
    .right-nav {
        display: none;
    }

    .main-content {
        margin-right: 0;
        max-width: calc(100% - var(--sidebar-width));
    }
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    .bg-grid {
        background-size: 30px 30px;
    }

    .lang-switch {
        top: 12px;
        right: 12px;
    }

    .lang-switch a {
        padding: 6px 12px;
        font-size: 12px;
    }

    .page-layout {
        flex-direction: column;
    }

    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .sidebar-content {
        padding: 32px 24px;
        padding-top: 50px;
    }

    .sidebar-name {
        font-size: 22px;
    }

    .sidebar-title {
        margin-bottom: 20px;
    }

    .main-content {
        margin-left: 0;
        max-width: 100%;
        padding: 32px 20px 24px;
    }

    .section-title {
        font-size: 18px;
    }

    .card {
        padding: 16px;
    }

    .card-header {
        flex-direction: column;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}