/* Navigation */
.app-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--surface);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-fixed);
    padding: var(--space-md) 0;
    transition: all var(--transition-base);
}

.app-bar.scrolled {
    box-shadow: var(--shadow-md);
    padding: var(--space-sm) 0;
}

.app-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--fs-2xl);
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: all var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
    text-shadow: var(--glow);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-sm);
}

.nav-link {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    color: var(--on-surface);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--primary);
    transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.theme-toggle {
    background: transparent;
    border: 2px solid var(--outline);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    cursor: pointer;
    color: var(--on-surface);
    font-size: var(--fs-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: rotate(180deg);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--on-surface);
    font-size: var(--fs-2xl);
    cursor: pointer;
    padding: var(--space-sm);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    animation: fadeInUp 0.8s ease-out;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--on-surface-variant);
    font-size: var(--fs-lg);
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: clamp(var(--fs-4xl), 6vw, var(--fs-6xl));
    margin-bottom: var(--space-xl);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(var(--fs-lg), 2vw, var(--fs-2xl));
    margin-bottom: var(--space-2xl);
    color: var(--on-surface-variant);
    line-height: 1.5;
}

.hero-cta {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.hero-visual {
    position: absolute;
    right: -10%;
    top: 50%;
    transform: translateY(-50%);
    width: 50%;
    height: 80%;
    z-index: 1;
    opacity: 0.15;
    pointer-events: none;
}

.liquid-shape {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--accent-purple));
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    animation: morph 20s ease-in-out infinite alternate;
    filter: blur(40px);
}

@keyframes morph {
    0%, 100% {
        border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    }
    25% {
        border-radius: 58% 42% 75% 25% / 76% 46% 54% 24%;
    }
    50% {
        border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%;
    }
    75% {
        border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%;
    }
}

/* Section Headers */
.section-header {
    margin-bottom: var(--space-4xl);
}

.section-number {
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: var(--fs-xl);
    margin-right: var(--space-sm);
}

.section-title {
    display: inline;
    position: relative;
}

.section-title::after {
    content: '';
    display: inline-block;
    width: 200px;
    height: 1px;
    background: var(--outline);
    margin-left: var(--space-xl);
    vertical-align: middle;
}

/* Bio Card */
.bio-card {
    display: flex;
    gap: var(--space-3xl);
    background: var(--surface);
    padding: var(--space-3xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.bio-stats {
    display: flex;
    gap: var(--space-3xl);
    margin-top: var(--space-xl);
}

.stat-item h4 {
    color: var(--primary);
    font-size: var(--fs-3xl);
    margin-bottom: var(--space-xs);
}

.stat-item small {
    color: var(--on-surface-variant);
    font-size: var(--fs-sm);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.skill-category {
    background: var(--surface);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--primary);
    margin-bottom: var(--space-lg);
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skill-tag {
    background: var(--surface-variant);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--fs-sm);
    color: var(--on-surface-variant);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--primary);
    color: var(--on-primary);
    transform: translateY(-2px);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--space-3xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--outline);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-3xl);
    padding-left: var(--space-xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -42px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--background);
    box-shadow: 0 0 0 3px var(--outline);
}

.timeline-date {
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    margin-bottom: var(--space-sm);
}

/* Project Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.project-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    width: 100%;
    height: 200px;
    position: relative;
    overflow: hidden;
    background: var(--surface-variant);
}

.project-preview-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.project-image-fallback {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    font-size: var(--fs-4xl);
    background: var(--surface-variant);
}

.project-image.is-loaded .project-preview-image {
    display: block;
}

.project-image.is-loaded .project-image-fallback {
    display: none;
}

.project-content {
    padding: var(--space-xl);
}

.project-title {
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.project-description {
    color: var(--on-surface-variant);
    font-size: var(--fs-sm);
    margin-bottom: var(--space-lg);
    min-height: 60px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.project-links {
    display: flex;
    gap: var(--space-md);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--primary);
    font-weight: 600;
    font-size: var(--fs-sm);
}

.project-link:hover {
    text-decoration: underline;
}

/* Contact Card */
.contact-card {
    background: var(--surface);
    padding: var(--space-4xl) var(--space-3xl);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
    margin-top: var(--space-2xl);
}

/* Footer */
footer {
    padding: var(--space-4xl) 0;
    text-align: center;
    color: var(--on-surface-variant);
    font-size: var(--fs-sm);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-5xl);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Responsive */
@media (max-width: 968px) {
    .hero-visual {
        width: 60%;
        right: -20%;
    }
}

@media (max-width: 768px) {
    .nav-list {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .bio-card {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .bio-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .hero-visual {
        display: none;
    }

    .section-title::after {
        display: none;
    }

    .timeline {
        padding-left: var(--space-xl);
    }

    .timeline-item {
        padding-left: var(--space-md);
    }

    .timeline-item::before {
        left: -30px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }

    .button {
        width: 100%;
        justify-content: center;
    }

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