:root {
    --bg-color: #111827;
    /* Lighter Cool Gray/Navy */
    --bg-secondary: #1f2937;
    /* Lighter Secondary */
    --text-primary: #f9fafb;
    /* Brighter White */
    --text-secondary: #e5e7eb;
    /* Much lighter gray for readability */
    --accent-color: #38bdf8;
    /* Sky Blue - brighter than Cyan */
    --accent-glow: rgba(56, 189, 248, 0.4);
    --secondary-accent: #818cf8;
    /* Indigo */
    --card-bg: rgba(255, 255, 255, 0.08);
    /* More visible cards */
    --border-color: rgba(255, 255, 255, 0.15);
    /* Stronger borders */
    --font-main: 'Inter', 'Noto Sans TC', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

.section-padding {
    padding: 100px 0;
}

.highlight {
    color: var(--accent-color);
    text-shadow: 0 0 20px var(--accent-glow);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-glow {
    background: var(--accent-color);
    color: #000;
    box-shadow: 0 0 15px var(--accent-glow);
}

.btn-glow:hover {
    background: #fff;
    box-shadow: 0 0 25px rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    margin-left: 15px;
}

.btn-outline:hover {
    background: rgba(0, 243, 255, 0.1);
    color: #fff;
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    background: rgba(17, 24, 39, 0.9);
    /* Updated to match new bg */
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    letter-spacing: 1px;
}

.logo .dot {
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 30px;
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-link.btn-primary {
    background: var(--card-bg);
    padding: 8px 20px;
    border-radius: 20px;
    color: #fff;
    border: 1px solid var(--border-color);
}

.nav-link.btn-primary:hover {
    border-color: var(--accent-color);
    background: rgba(56, 189, 248, 0.1);
}

.menu-toggle {
    display: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(56, 189, 248, 0.15) 0%, rgba(17, 24, 39, 0) 70%);
    z-index: -1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

/* Animations */
.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Services */
.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.03), transparent);
    transform: translateX(-100%);
    transition: 0.5s;
}

.service-card:hover::before {
    transform: translateX(100%);
}

.icon-box {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.service-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Portfolio */
.portfolio {
    background: var(--bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 60px;
}

.portfolio-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    background: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.portfolio-item:nth-child(even) .portfolio-content {
    order: 2;
}

.portfolio-item:nth-child(even) .portfolio-visual {
    order: 1;
}

.portfolio-content {
    padding: 40px;
}

.client-logo {
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 20px;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.portfolio-content h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #fff;
}

.portfolio-content p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.tags {
    list-style: none;
    display: flex;
    gap: 10px;
}

.tags li {
    background: rgba(255, 255, 255, 0.1);
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-color);
}

.portfolio-visual {
    height: 100%;
    min-height: 300px;
    background: #222;
    position: relative;
    overflow: hidden;
}

/* Abstract visuals for portfolio */
.visual-familymart {
    background: linear-gradient(135deg, #009944 0%, #0055aa 100%);
    opacity: 0.8;
}

.visual-fujitsu {
    background: linear-gradient(135deg, #c7000b 0%, #440000 100%);
    opacity: 0.8;
}

/* DevTools Section */
.devtools {
    background: var(--bg-color);
}

.tool-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    gap: 15px;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 25px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    font-family: var(--font-main);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--accent-color);
    color: #000;
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.tool-card h3 {
    margin-bottom: 25px;
    text-align: center;
    color: var(--accent-color);
}

.tool-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.input-group textarea {
    width: 100%;
    height: 120px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    color: #fff;
    font-family: 'Courier New', monospace;
    resize: vertical;
    transition: var(--transition);
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(0, 0, 0, 0.5);
}

.tool-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.input-group {
    position: relative;
}

.btn-copy {
    position: absolute;
    top: 35px;
    right: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-secondary);
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

.btn-copy:hover {
    background: var(--accent-color);
    color: #000;
}

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
    padding: 60px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.contact-item i {
    color: var(--accent-color);
    margin-right: 15px;
    font-size: 1.2rem;
}

.contact-form .form-group {
    margin-bottom: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: #fff;
    font-family: inherit;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(0, 0, 0, 0.5);
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero-content h1 {
        font-size: 3rem;
    }

    .portfolio-item,
    .portfolio-item:nth-child(even) {
        grid-template-columns: 1fr;
    }

    .portfolio-item:nth-child(even) .portfolio-content {
        order: 1;
    }

    .portfolio-item:nth-child(even) .portfolio-visual {
        order: 2;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 40px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        cursor: pointer;
    }

    .bar {
        display: block;
        width: 25px;
        height: 3px;
        margin: 5px auto;
        transition: all 0.3s ease-in-out;
        background-color: #fff;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 16px 0;
    }

    .nav-link {
        margin: 0;
        display: block;
        padding: 15px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-btns {
        display: flex;
        flex-direction: column;
        gap: 15px;
    }

    .btn-outline {
        margin-left: 0;
    }
}