/* ============================================
   灌篮高手风格个人博客 - Slam Dunk Style
   ============================================ */

/* CSS Variables - 湘北高校配色 */
:root {
    /* 湘北红 */
    --primary-red: #d32f2f;
    --primary-red-dark: #b71c1c;
    --primary-red-light: #ef5350;

    /* 篮球橙 */
    --basketball-orange: #ff6b35;
    --basketball-orange-dark: #e55a2b;
    --basketball-orange-light: #ff8a5b;

    /* 深蓝 */
    --navy-blue: #1a237e;
    --navy-blue-dark: #0d1555;
    --navy-blue-light: #283593;

    /* 辅助色 */
    --white: #ffffff;
    --off-white: #f5f5f5;
    --gray-light: #e0e0e0;
    --gray: #9e9e9e;
    --gray-dark: #424242;
    --black: #000000;

    /* 木地板色 */
    --wood-light: #deb887;
    --wood: #cd853f;
    --wood-dark: #8b4513;

    /* 字体 */
    --font-display: 'Russo One', 'Bebas Neue', sans-serif;
    --font-heading: 'Bebas Neue', 'Noto Sans SC', sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--off-white);
    color: var(--black);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Speed Lines Background */
.speed-lines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.03;
    background:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            var(--black) 50px,
            var(--black) 51px
        );
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    background: linear-gradient(180deg, rgba(26, 35, 126, 0.95) 0%, rgba(26, 35, 126, 0) 100%);
    backdrop-filter: blur(10px);
}

.nav-brand {
    display: flex;
    align-items: center;
}

.brand-text {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--basketball-orange);
    letter-spacing: 0.1em;
    text-shadow: 2px 2px 0 var(--primary-red);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--basketball-orange);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--basketball-orange);
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 3rem 3rem;
    overflow: hidden;
    background:
        linear-gradient(135deg, var(--navy-blue) 0%, var(--navy-blue-dark) 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 35px,
            rgba(255, 107, 53, 0.03) 35px,
            rgba(255, 107, 53, 0.03) 70px
        );
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
}

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

.hero-badge {
    display: inline-block;
    margin-bottom: 2rem;
    padding: 0.75rem 2rem;
    background: var(--basketball-orange);
    clip-path: polygon(10% 0%, 100% 0%, 90% 100%, 0% 100%);
    animation: bounceIn 0.8s ease-out 0.2s backwards;
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.badge-text {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 0.2em;
}

.hero-title {
    margin-bottom: 2rem;
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 8rem);
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
    color: var(--white);
    text-shadow:
        4px 4px 0 var(--primary-red),
        8px 8px 0 rgba(0, 0, 0, 0.3);
}

.title-line {
    display: block;
    opacity: 0;
    animation: slideInLeft 0.8s ease-out forwards;
}

.title-line:nth-child(1) {
    animation-delay: 0.3s;
}

.title-line:nth-child(2) {
    animation-delay: 0.5s;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.title-main {
    font-size: 1.3em;
    color: var(--basketball-orange);
    background: linear-gradient(135deg, var(--basketball-orange) 0%, var(--primary-red-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    margin-bottom: 3rem;
    font-size: 1.3rem;
    color: var(--white);
    opacity: 0.9;
    animation: fadeIn 1s ease-out 0.7s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 0.9;
    }
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.9s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.2rem 2.5rem;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-base);
    cursor: pointer;
    clip-path: polygon(8% 0%, 100% 0%, 92% 100%, 0% 100%);
}

.btn-primary {
    background: var(--basketball-orange);
    color: var(--white);
    box-shadow:
        0 4px 15px rgba(255, 107, 53, 0.4),
        inset 0 -4px 0 rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    background: var(--basketball-orange-dark);
    transform: translateY(-2px);
    box-shadow:
        0 6px 20px rgba(255, 107, 53, 0.5),
        inset 0 -4px 0 rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 3px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--navy-blue);
    transform: translateY(-2px);
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateY(3px);
}

/* Basketball Decoration */
.basketball-decoration {
    position: absolute;
    top: 10%;
    right: 5%;
    z-index: 1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(10deg);
    }
}

.basketball {
    width: 120px;
    height: 120px;
    color: var(--basketball-orange);
    opacity: 0.6;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

/* About Section */
.about {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 8px;
    background: linear-gradient(90deg, var(--basketball-orange), var(--primary-red), var(--navy-blue));
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.about-grid {
    display: grid;
    gap: 3rem;
}

.about-card {
    background: var(--off-white);
    padding: 3rem;
    border-left: 6px solid var(--basketball-orange);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.12);
}

.card-deco {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    opacity: 0.05;
}

.basketball-icon {
    width: 100%;
    height: 100%;
    color: var(--basketball-orange);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--navy-blue);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.title-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--basketball-orange);
    color: var(--white);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    border-radius: 50%;
    flex-shrink: 0;
}

.section-title-large {
    font-size: 3.5rem;
    margin-bottom: 3rem;
}

.about-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--gray-dark);
    margin-bottom: 2rem;
}

.about-text strong {
    color: var(--basketball-orange);
    font-weight: 700;
}

.skills {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.skill-tag {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: var(--navy-blue);
    color: var(--white);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 25px;
    transition: all var(--transition-base);
}

.skill-tag:hover {
    background: var(--basketball-orange);
    transform: scale(1.05);
}

/* Posts Section */
.posts {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--off-white);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.post-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all var(--transition-base);
    position: relative;
    display: flex;
    flex-direction: column;
}

.post-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--basketball-orange), var(--primary-red));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.15);
}

.post-card:hover::before {
    transform: scaleX(1);
}

.post-number {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 50px;
    height: 50px;
    background: var(--navy-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.post-num {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--basketball-orange);
}

.post-content {
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.post-meta {
    margin-bottom: 1rem;
}

.post-date {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--navy-blue);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.post-title a:hover {
    color: var(--basketball-orange);
}

.post-excerpt {
    flex: 1;
    color: var(--gray-dark);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.post-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--basketball-orange);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
}

.link-icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.post-link:hover .link-icon {
    transform: translateX(4px);
}

/* Footer */
.footer {
    background: var(--navy-blue);
    color: var(--white);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    color: var(--basketball-orange);
    letter-spacing: 0.1em;
}

.footer-text {
    font-size: 1rem;
    color: var(--white);
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--white);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--basketball-orange);
}

.footer-link .link-icon {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.9rem;
    color: var(--white);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem 1.5rem;
    }

    .nav-menu {
        gap: 1rem;
    }

    .nav-link {
        font-size: 1rem;
    }

    .hero {
        padding: 5rem 1.5rem 2rem;
    }

    .hero-title {
        font-size: clamp(2.5rem, 15vw, 5rem);
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .basketball-decoration {
        width: 80px;
        height: 80px;
    }

    .about,
    .posts {
        padding: 4rem 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-title-large {
        font-size: 2.5rem;
    }

    .about-card {
        padding: 2rem;
    }

    .posts-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .brand-text {
        font-size: 1.5rem;
    }

    .hero-badge {
        padding: 0.5rem 1.5rem;
        margin-bottom: 1.5rem;
    }

    .badge-text {
        font-size: 1rem;
    }
}

/* Scroll Animations */
@media (prefers-reduced-motion: no-preference) {
    .about-card,
    .post-card {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }

    .about-card.visible,
    .post-card.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .post-card:nth-child(1) { transition-delay: 0.1s; }
    .post-card:nth-child(2) { transition-delay: 0.2s; }
    .post-card:nth-child(3) { transition-delay: 0.3s; }
    .post-card:nth-child(4) { transition-delay: 0.4s; }
    .post-card:nth-child(5) { transition-delay: 0.5s; }
    .post-card:nth-child(6) { transition-delay: 0.6s; }
}