/* ============================
   CSS Variables
   ============================ */
:root {
    /* Colors */
    --color-bg: #0f0f0f;
    --color-bg-secondary: #1a1a2e;
    --color-primary: #ff6b35;
    --color-secondary: #00d4aa;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-border: #2a2a3e;
    --color-github: #6e5494;
    --color-ai: #00d4aa;
    --color-tool: #3b82f6;

    /* Typography */
    --font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Header */
    --header-height: 60px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================
   Layout
   ============================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-2xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: var(--space-md) auto 0;
    border-radius: var(--radius-sm);
}

/* ============================
   Buttons
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #ff8c5a);
    color: var(--color-text);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
    color: var(--color-text);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
}

/* ============================
   Header
   ============================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(15, 15, 15, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background var(--transition-normal);
}

.header.scrolled {
    background: rgba(15, 15, 15, 0.95);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.logo:hover {
    color: var(--color-primary);
}

.nav-list {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-normal);
}

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

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================
   Hero Section
   ============================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: var(--space-3xl);
}

.hero-image {
    flex-shrink: 0;
}

.profile-photo {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-primary);
    box-shadow: 0 0 40px rgba(255, 107, 53, 0.3);
}

.hero-content {
    max-width: 700px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.hero-nickname {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

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

.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
}

.badge-n8n {
    background: rgba(255, 107, 53, 0.15);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.badge-ai {
    background: rgba(0, 212, 170, 0.15);
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

.badge-exp {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--color-tool);
    color: var(--color-tool);
}

.hero-quote {
    font-size: var(--font-size-lg);
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    padding-left: var(--space-md);
    border-left: 3px solid var(--color-primary);
}

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

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 70% 30%, rgba(255, 107, 53, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 30% 70%, rgba(0, 212, 170, 0.1) 0%, transparent 50%);
    z-index: 0;
}

/* ============================
   About Section
   ============================ */
.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.highlight-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.highlight-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.15);
}

.highlight-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.highlight-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.highlight-desc {
    color: var(--color-text-muted);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.about-highlight-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-primary) !important;
}

/* ============================
   Projects Section
   ============================ */
.filter-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--color-text);
    border-color: var(--color-primary);
    background: rgba(255, 107, 53, 0.15);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

/* Project Card */
.project-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--color-primary);
}

.project-card-header {
    position: relative;
    padding: var(--space-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-category {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.project-category.n8n {
    background: rgba(255, 107, 53, 0.2);
    color: var(--color-primary);
}

.project-category.github {
    background: rgba(110, 84, 148, 0.2);
    color: var(--color-github);
}

.project-category.ai {
    background: rgba(0, 212, 170, 0.2);
    color: var(--color-ai);
}

.project-category.tool {
    background: rgba(59, 130, 246, 0.2);
    color: var(--color-tool);
}

.project-github-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-bg);
    transition: all var(--transition-fast);
}

.project-github-link:hover {
    background: var(--color-github);
    color: var(--color-text);
}

.project-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-image-placeholder {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.project-card-body {
    padding: var(--space-lg);
}

.project-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.project-desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
}

.project-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.metric-tag {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(0, 212, 170, 0.15);
    color: var(--color-secondary);
    border-radius: var(--radius-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tech-tag {
    font-size: var(--font-size-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg);
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
}

.project-card-footer {
    padding: 0 var(--space-lg) var(--space-lg);
}

.project-btn {
    width: 100%;
    padding: var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.project-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* ============================
   Skills Section
   ============================ */
.skills-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

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

.skill-category-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-primary);
}

.skill-item {
    margin-bottom: var(--space-lg);
}

.skill-item:last-child {
    margin-bottom: 0;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.skill-name {
    font-weight: 500;
}

.skill-level {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.skill-bar {
    height: 8px;
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-xl);
    width: 0;
    transition: width 1s ease-out;
}

/* ============================
   Contact Section
   ============================ */
.contact {
    background: var(--color-bg-secondary);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
}

.contact-item svg {
    color: var(--color-primary);
}

.contact-item a:hover {
    color: var(--color-primary);
}

/* ============================
   Footer
   ============================ */
.footer {
    padding: var(--space-xl) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ============================
   Modal
   ============================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    overflow-y: auto;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: 50%;
    color: var(--color-text);
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    background: var(--color-primary);
}

.modal-header {
    padding: var(--space-xl);
    padding-right: 60px;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.modal-category {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.modal-body {
    padding: var(--space-xl);
}

/* Modal Swiper */
.modal-swiper {
    margin-bottom: var(--space-xl);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.modal-swiper .swiper-slide {
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    max-height: 450px;
}

.modal-swiper .swiper-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    cursor: zoom-in;
    transition: transform 0.2s ease;
}

.modal-swiper .swiper-slide img:hover {
    opacity: 0.9;
}

.modal-swiper .swiper-button-prev,
.modal-swiper .swiper-button-next {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.5);
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.modal-swiper .swiper-button-prev::after,
.modal-swiper .swiper-button-next::after {
    font-size: 16px;
}

.modal-swiper .swiper-pagination-bullet {
    background: var(--color-text);
    opacity: 0.5;
}

.modal-swiper .swiper-pagination-bullet-active {
    background: var(--color-primary);
    opacity: 1;
}

/* Modal Video */
.modal-video {
    margin-bottom: var(--space-xl);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16 / 9;
    background: var(--color-bg);
}

.modal-video iframe,
.modal-video video {
    width: 100%;
    height: 100%;
}

/* Modal Details */
.modal-details {
    margin-bottom: var(--space-xl);
    white-space: pre-wrap;
    line-height: 1.8;
    color: var(--color-text-muted);
}

/* Modal Actions */
.modal-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.modal-actions .btn {
    flex: 1;
    min-width: 150px;
}

/* ============================
   Animations
   ============================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ============================
   Responsive Design
   ============================ */

/* Tablet */
@media (max-width: 1023px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .skills-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-highlights {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .profile-photo {
        width: 220px;
        height: 220px;
    }
}

/* Mobile */
@media (max-width: 767px) {
    .hamburger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        text-align: center;
        gap: var(--space-xl);
    }

    .nav-link {
        font-size: var(--font-size-xl);
    }

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

    .skills-container {
        grid-template-columns: 1fr;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .profile-photo {
        width: 180px;
        height: 180px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .filter-container {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: var(--space-sm);
        -webkit-overflow-scrolling: touch;
    }

    .filter-btn {
        flex-shrink: 0;
    }

    .modal-content {
        max-height: 100vh;
        border-radius: 0;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions .btn {
        width: 100%;
    }
}

/* ============================
   Scrollbar
   ============================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-xl);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ============================
   Selection
   ============================ */
::selection {
    background: var(--color-primary);
    color: var(--color-text);
}

/* ============================
   Image Lightbox
   ============================ */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    cursor: zoom-out;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox img {
    max-width: 95%;
    max-height: 95%;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: 0 0 60px rgba(255, 107, 53, 0.3);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.lightbox-close svg {
    color: white;
    width: 24px;
    height: 24px;
}