/* ==========================================
   Apple Style Personal Website v1.2.0
   Design: Clean, Spacious, Sophisticated
   ========================================== */

:root {
    --primary: #1d1d1f;
    --secondary: #86868b;
    --accent: #2997ff;
    --bg: #fbfbfd;
    --card-bg: #ffffff;
    --border: #d2d2d7;
    
    --transition-fast: 0.4s;
    --transition-normal: 0.8s;
    --transition-slow: 1.2s;
    --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
}

html, body {
    scroll-padding: 0;
    overscroll-behavior-y: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'PingFang SC', sans-serif;
    background: var(--bg);
    color: var(--primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.full-screen {
    min-height: 100vh;
    width: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 60px 0;
    box-sizing: border-box;
    overflow: hidden;
}

.screen-container {
    max-width: 980px;
    width: 100%;
    padding: 20px 22px;
    box-sizing: border-box;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 64px;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: 8px;
}

.section-subtitle {
    font-size: 24px;
    color: var(--secondary);
    font-weight: 400;
    margin-bottom: 6px;
}

.section-engtitle {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.8;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: saturate(120%) blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: background var(--transition-normal) var(--ease-smooth),
                border-color var(--transition-normal) var(--ease-smooth);
}

.navbar.scrolled {
    background: rgba(251, 251, 253, 0.6);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
    height: 52px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 21px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.7;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--primary);
    font-size: 14px;
    font-weight: 400;
    opacity: 0.7;
    transition: opacity var(--transition-fast) var(--ease-smooth),
                color var(--transition-normal) var(--ease-smooth);
}

.nav-menu a:hover {
    opacity: 1;
}

.nav-menu a.nav-link.active {
    color: var(--accent);
    font-weight: 600;
    opacity: 1;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    cursor: pointer;
    z-index: 9999;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal) var(--ease-smooth);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    -webkit-tap-highlight-color: transparent;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(41, 151, 255, 0.4);
}

.back-to-top:active {
    transform: translateY(0) scale(0.95);
}

.hero-screen {
    background: linear-gradient(180deg, #fbfbfd 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    padding: 0;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-bg-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.15;
}

.hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(251,251,253,0.1) 0%, rgba(255,255,255,0.5) 100%);
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding-top: 52px;
}

.navbar {
    animation: fadeInDown 1.2s ease-out 0.2s both;
}

.hero-title {
    font-size: 96px;
    font-weight: 700;
    letter-spacing: -4px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, 
        #1d1d1f 0%, #2d3748 14%, #2b6cb0 28%, #3182ce 42%,
        #2b878c 57%, #2c5282 71%, #553c9a 85%, #1d1d1f 100%
    );
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientFlow 12s ease-in-out infinite, fadeInUp 1.5s ease-out 0.5s both;
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    25% { background-position: 50% 50%; }
    50% { background-position: 100% 50%; }
    75% { background-position: 50% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.hero-engname {
    font-size: 18px;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 12px;
    opacity: 0.9;
    animation: fadeInUp 1.5s ease-out 0.7s both;
}

.hero-subtitle {
    font-size: 28px;
    font-weight: 400;
    color: var(--secondary);
    margin-bottom: 18px;
    letter-spacing: -0.5px;
    animation: fadeInUp 1.5s ease-out 0.9s both;
}

.hero-desc {
    font-size: 21px;
    color: var(--secondary);
    font-weight: 300;
    animation: fadeInUp 1.5s ease-out 1.3s both;
}

.scroll-hint {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--secondary);
    font-size: 14px;
    animation: bounce 2s infinite 2.5s, fadeIn 1.5s ease-out 2s both;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.scroll-hint:active {
    transform: translateX(-50%) scale(0.95);
}

.arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--secondary);
    border-bottom: 2px solid var(--secondary);
    transform: rotate(45deg);
    margin: 10px auto 0;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.about-screen {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.about-card {
    background: #ffffff;
    padding: 40px;
    border-radius: 22px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.about-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.about-card h4 {
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary);
}

.about-card p {
    font-size: 17px;
    color: var(--secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.skill-tag {
    background: rgba(29, 29, 31, 0.05);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 500;
    transition: all var(--transition-fast) var(--ease-smooth);
}

.skill-tag:hover {
    background: rgba(29, 29, 31, 0.1);
    transform: translateY(-2px);
}

.career-screen {
    background: #ffffff;
}

.career-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.timeline-card, .skills-card, .works-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 22px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.timeline-card:hover, .skills-card:hover, .works-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.timeline-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.timeline-position {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 8px;
}

.timeline-date {
    font-size: 14px;
    color: var(--secondary);
    margin-bottom: 16px;
}

.timeline-desc {
    list-style: none;
    padding: 0;
}

.timeline-desc li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 15px;
    color: var(--primary);
}

.timeline-desc li::before {
    content: '>';
    color: var(--accent);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skill-name {
    font-size: 15px;
    font-weight: 500;
    color: var(--primary);
}

.skill-bar {
    height: 8px;
    background: #e5e5ea;
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    width: 0 !important;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
    transition: width 1.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.work-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.work-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.work-item:last-child {
    border-bottom: none;
}

.work-year {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    min-width: 50px;
}

.work-name {
    font-size: 15px;
    color: var(--primary);
    margin: 0;
}

.investment-screen {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.investment-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.invest-card {
    background: #ffffff;
    padding: 36px;
    border-radius: 22px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.invest-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.invest-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.invest-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.invest-card p {
    font-size: 17px;
    color: var(--secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.invest-card strong {
    color: var(--primary);
    font-weight: 600;
}

.direction-list {
    list-style: none;
    margin: 12px 0;
}

.direction-list li {
    font-size: 17px;
    color: var(--primary);
    font-weight: 500;
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.direction-list li::before {
    content: '>';
    color: var(--accent);
    font-weight: 700;
    position: absolute;
    left: 0;
}

.small-note {
    font-size: 14px !important;
    color: var(--secondary) !important;
    opacity: 0.7;
    margin-top: 12px;
}

.life-screen {
    background: #ffffff;
}

.life-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.life-card {
    background: #ffffff;
    padding: 32px 24px;
    border-radius: 22px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.life-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.life-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.life-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary);
}

.life-card p {
    font-size: 14px;
    color: var(--secondary);
    line-height: 1.7;
    margin: 0;
}

.life-quote {
    text-align: center;
    padding: 40px 0 20px;
}

.life-quote p {
    font-size: 22px;
    font-weight: 500;
    color: var(--secondary);
    font-style: italic;
    margin: 0;
}

.blog-screen {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    padding: 80px 0;
    align-items: flex-start;
}

.blog-screen-container {
    max-width: 1280px;
    width: 100%;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 260px 1fr 240px;
    gap: 40px;
    margin-top: 20px;
}

.blog-sidebar {
    position: sticky;
    top: 80px;
    height: fit-content;
}

.profile-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 22px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    text-align: center;
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.profile-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.profile-avatar {
    margin-bottom: 20px;
}

.avatar-placeholder {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 36px;
    font-weight: 700;
    margin: 0 auto;
}

.profile-name {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

.profile-bio {
    font-size: 14px;
    color: var(--secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.profile-location {
    font-size: 13px;
    color: var(--secondary);
    opacity: 0.8;
    margin-bottom: 20px;
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 12px;
    color: var(--secondary);
}

.profile-social {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.social-link {
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.social-link:hover {
    opacity: 0.7;
}

.blog-main {
    min-width: 0;
}

.blog-header {
    margin-bottom: 32px;
}

.blog-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.post-card {
    background: #ffffff;
    padding: 32px;
    border-radius: 22px;
    margin-bottom: 24px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
    cursor: pointer;
    overflow: hidden;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.post-card:active {
    transform: translateY(-4px) scale(0.99);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.post-date {
    font-size: 14px;
    color: var(--secondary);
    margin-bottom: 0;
}

.post-tag {
    font-size: 12px;
    color: var(--accent);
    background: rgba(41, 151, 255, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 500;
}

.post-card .post-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
    color: var(--primary);
    transition: color var(--transition-fast);
}

.post-card:hover .post-title {
    color: var(--accent);
}

.post-excerpt {
    font-size: 15px;
    color: var(--secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.post-read-more {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
    transition: transform var(--transition-fast);
}

.post-card:hover .post-read-more {
    transform: translateX(4px);
}

.post-full-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
    margin-top: 0;
    padding-top: 0;
    border-top: 1px solid transparent;
}

.post-card.expanded .post-full-content {
    max-height: 5000px;
    opacity: 1;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.post-full-content p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--primary);
    margin-bottom: 16px;
}

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

.post-card.expanded .post-read-more span {
    transform: none;
}

.post-card.expanded .post-read-more span::before {
    content: 'Collapse ';
}

.post-card.expanded .post-read-more span::after {
    content: ' ^';
}

.widget {
    background: #ffffff;
    padding: 24px;
    border-radius: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-normal) var(--ease-smooth),
                box-shadow var(--transition-normal) var(--ease-smooth);
}

.widget:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

.widget-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: -0.2px;
}

.widget-list {
    list-style: none;
}

.widget-list li {
    margin-bottom: 10px;
}

.widget-list li:last-child {
    margin-bottom: 0;
}

.widget-list a {
    font-size: 14px;
    color: var(--secondary);
    text-decoration: none;
    line-height: 1.7;
    transition: color var(--transition-fast);
    display: block;
}

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

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-cloud .tag {
    font-size: 12px;
    color: var(--secondary);
    background: rgba(29, 29, 31, 0.05);
    padding: 6px 12px;
    border-radius: 20px;
    transition: all var(--transition-fast) var(--ease-smooth);
    cursor: pointer;
}

.tag-cloud .tag:hover {
    color: var(--accent);
    background: rgba(41, 151, 255, 0.1);
    transform: translateY(-2px);
}

.tag-cloud .tag.active {
    color: white;
    background: var(--accent);
}

.tag-cloud .tag.active:hover {
    color: white;
    transform: translateY(-2px);
}

.footer {
    background: #f5f5f7;
    padding: 30px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-content p {
    font-size: 14px;
    color: var(--secondary);
    margin: 0;
}

.footer-divider {
    margin: 0 8px;
    opacity: 0.3;
}

.fade-in {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity var(--transition-slow) var(--ease-smooth),
                transform var(--transition-slow) var(--ease-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.blog-toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    color: white;
    border-radius: 12px;
    font-size: 14px;
    z-index: 99999;
    transition: all 0.3s var(--ease-smooth);
}

.comments-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.comments-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.comments-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

.comments-count {
    font-size: 14px;
    color: var(--secondary);
}

.comments-list {
    margin-bottom: 28px;
}

.comment-item {
    padding: 16px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.comment-item:last-child {
    border-bottom: none;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.comment-nickname {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
}

.comment-date {
    font-size: 12px;
    color: var(--secondary);
}

.comment-content {
    font-size: 14px;
    color: var(--primary);
    line-height: 1.7;
}

.comment-form-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--primary);
}

.comment-form-row {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 12px;
    margin-bottom: 12px;
}

.comment-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.comment-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.1);
}

.comment-textarea {
    min-height: 80px;
    resize: vertical;
    line-height: 1.6;
}

.comment-submit {
    text-align: right;
}

.btn-comment {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-comment:hover {
    background: #0077ed;
    transform: translateY(-2px);
}

.empty-comments {
    text-align: center;
    padding: 30px 0;
    color: var(--secondary);
    font-size: 14px;
}

@media (min-width: 1440px) {
    .hero-title { font-size: 96px; }
    .section-title { font-size: 72px; }
    .blog-screen-container { max-width: 1400px; gap: 50px; }
}

@media (max-width: 1200px) {
    .hero-title { font-size: 84px; }
    .section-title { font-size: 56px; }
}

@media (max-width: 1024px) {
    .hero-title { font-size: 72px; }
    .hero-subtitle { font-size: 24px; }
    .section-title { font-size: 48px; }
    .section-subtitle { font-size: 21px; }
    .blog-screen-container {
        grid-template-columns: 240px 1fr;
        gap: 32px;
    }
    .blog-sidebar.right { display: none; }
    
    .investment-grid, .about-grid, .career-grid { gap: 20px; }
    .invest-card, .about-card, .timeline-card, .skills-card, .works-card { padding: 28px; }
    .life-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    html { scroll-snap-type: none; }
    .full-screen {
        min-height: auto;
        padding: 60px 0;
    }
    .hero-screen { min-height: 100vh; }
    
    .hero-title { font-size: 56px; }
    .hero-subtitle { font-size: 20px; }
    .hero-desc { font-size: 16px; }
    .section-title { font-size: 40px; }
    .section-subtitle { font-size: 18px; }
    
    .about-grid, .investment-grid, .career-grid { grid-template-columns: 1fr; }
    .life-grid { grid-template-columns: repeat(2, 1fr); }
    
    .blog-screen-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .blog-sidebar { position: static; }
    .blog-sidebar.left { order: 2; }
    .blog-main { order: 1; }
    
    .nav-menu { gap: 20px; }
    .nav-menu a { font-size: 12px; }
    
    .invest-card, .about-card, .post-card { padding: 24px; }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 18px;
    }
}

@media (max-width: 576px) {
    .hero-title { font-size: 44px; }
    .hero-subtitle { font-size: 18px; }
    .section-title { font-size: 32px; }
    .section-subtitle { font-size: 16px; }
    .section-engtitle { font-size: 12px; }
    .section-header { margin-bottom: 32px; }
    
    .logo { font-size: 18px; }
    .nav-menu { gap: 16px; }
    
    .life-grid { grid-template-columns: 1fr; }
    
    .invest-card, .about-card, .post-card {
        padding: 20px;
        border-radius: 18px;
    }
    .invest-card h3, .about-card h3 { font-size: 20px; }
    .post-card .post-title { font-size: 19px; }
}

@media (max-width: 400px) {
    .hero-title { font-size: 36px; }
    .hero-subtitle { font-size: 16px; }
    .section-title { font-size: 28px; }
    
    .nav-container { padding: 0 16px; }
    .nav-menu { gap: 12px; }
    .nav-menu a { font-size: 11px; }
    
    .screen-container, .blog-screen-container { padding: 0 16px; }
}