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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --dark-bg: #0f0f23;
    --card-bg: #1a1a2e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --border-color: #2a2a3e;
    --success-color: #4ade80;
    --warning-color: #fbbf24;
    --gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.3s ease;
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.2s both;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 1s ease 0.4s both;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    animation: bounce 2s infinite;
}

.arrow-down {
    width: 20px;
    height: 20px;
    border-left: 2px solid var(--text-secondary);
    border-bottom: 2px solid var(--text-secondary);
    transform: rotate(-45deg);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.section-title {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.projects {
    padding: 5rem 0;
    min-height: 100vh;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 2rem;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.2);
}

.project-header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-bottom: 1px solid var(--border-color);
}

.project-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.expand-icon {
    font-size: 2rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
    line-height: 1;
}

.project-card.expanded .expand-icon {
    transform: rotate(45deg);
}

.project-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.project-card.expanded .project-content {
    max-height: 2000px;
}

.project-overview {
    padding: 2rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.project-details {
    padding: 2rem;
}

.architecture-diagram {
    background: rgba(15, 15, 35, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.arch-layer {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.arch-component {
    position: relative;
}

.component-box {
    background: var(--card-bg);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    min-width: 150px;
    text-align: center;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
}

.arch-component[data-layer="client"] .component-box {
    border-color: var(--success-color);
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.2);
}

.arch-component[data-layer="service"] .component-box {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.2);
}

.arch-component[data-layer="data"] .component-box {
    border-color: var(--warning-color);
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.2);
}

.component-box:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.tech-stack, .key-features {
    margin-bottom: 2rem;
}

.tech-stack h4, .key-features h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.key-features ul {
    list-style: none;
    padding-left: 0;
}

.key-features li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.key-features li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.about {
    padding: 5rem 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

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

.about-content > p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.skills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.skill-category:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.skill-category p {
    color: var(--text-secondary);
}

.contact {
    padding: 5rem 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

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

.contact-intro {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    text-align: center;
    line-height: 1.8;
}

.contact-form {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(15, 15, 35, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.submit-button {
    width: 100%;
    padding: 1rem 2rem;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.submit-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

.submit-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.submit-button .button-loading {
    display: none;
}

.submit-button.loading .button-text {
    display: none;
}

.submit-button.loading .button-loading {
    display: inline;
}

.form-status {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-status.success {
    display: block;
    background: rgba(74, 222, 128, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.form-status.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid #ef4444;
    color: #ef4444;
}

.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

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

    .nav-menu {
        gap: 1rem;
    }

    .project-header h3 {
        font-size: 1.2rem;
    }

    .arch-layer {
        flex-direction: column;
        align-items: center;
    }

    .component-box {
        min-width: 200px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .nav-container {
        padding: 1rem;
    }

    .nav-menu {
        font-size: 0.9rem;
    }

    .container {
        padding: 1rem;
    }
}