/* ====================================
   MODERN PORTFOLIO STYLESHEET
   ==================================== */

:root {
    --primary-color: #0066cc;
    --primary-light: #3384d4;
    --primary-dark: #004499;
    --secondary-color: #ff6b6b;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --text-lighter: #999999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);

    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --text-dark: #e0e0e0;
    --text-light: #b0b0b0;
    --text-lighter: #808080;
    --bg-light: #1e1e1e;
    --bg-white: #2a2a2a;
    --border-color: #404040;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* ====================================
   RESET & BASE STYLES
   ==================================== */

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

html {
    scroll-behavior: smooth;
}

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

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
}

p {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

ul,
li {
    list-style: none;
}

/* ====================================
   UTILITY CLASSES
   ==================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-dark);
}

.section-description {
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-light);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ====================================
   NAVIGATION
   ==================================== */

.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.site-notice {
    background: rgba(255, 107, 107, 0.12);
    border-top: 1px solid rgba(255, 107, 107, 0.32);
    border-bottom: 1px solid rgba(255, 107, 107, 0.32);
    padding: 0.85rem var(--spacing-lg);
    text-align: center;
}

.site-notice p {
    margin: 0;
    color: #b42318;
    font-size: 0.95rem;
    font-weight: 600;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.nav-brand {
    display: inline-flex;
    flex-direction: column;
    gap: 0.15rem;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--text-dark);
    line-height: 1.1;
}

.nav-brand::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.1rem;
    bottom: 0.1rem;
    width: 3px;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

.nav-brand:hover {
    color: var(--text-dark);
}

.nav-brand-name {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.nav-brand-role {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--primary-color);
}

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-dark);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--primary-color);
    transform: rotate(20deg);
}

.nav-link {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

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

/* ====================================
   HERO SECTION
   ==================================== */

.hero {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05), rgba(255, 107, 107, 0.05));
}

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content {
    z-index: 2;
    padding-left: var(--spacing-xl);
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
}

.social-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    color: var(--text-dark);
    font-size: 1.3rem;
    transition: var(--transition);
    border: 2px solid var(--border-color);
}

.social-btn:hover {
    transform: translateY(-3px);
    background: var(--primary-color);
    color: var(--bg-white);
    border-color: var(--primary-color);
}

.social-btn.linkedin:hover {
    background: #0A66C2;
    border-color: #0A66C2;
}

.social-btn.github:hover {
    background: #333333;
    border-color: #333333;
}

.social-btn.email:hover {
    background: #EA4335;
    border-color: #EA4335;
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-button.secondary {
    background: var(--bg-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.cta-button.secondary:hover {
    background: var(--primary-color);
    color: var(--bg-white);
}

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

.hero-image img {
    width: 100%;
    max-width: 400px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    height: 400px;
}

/* ====================================
   ABOUT SECTION
   ==================================== */

.about-section {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-size: 1.05rem;
}

.about-text a {
    font-weight: 600;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.skill-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.skill-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.skill-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 0;
}

/* ====================================
   CV SECTION
   ==================================== */

.cv-section {
    background: var(--bg-white);
}

.cv-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.cv-column {
    padding: var(--spacing-lg);
    border-radius: 8px;
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
}

.cv-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.cv-subtitle i {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.cv-item {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.cv-item:last-child {
    border-bottom: none;
}

.cv-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-md);
}

.cv-header h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
}

.cv-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    white-space: nowrap;
}

.cv-company,
.cv-issuer {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: 500;
    margin: 0 0 var(--spacing-sm) 0;
}

.cv-details {
    list-style: disc;
    margin-left: var(--spacing-md);
    color: var(--text-light);
}

.cv-details li {
    margin-bottom: var(--spacing-sm);
}

.education-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 2px solid var(--primary-color);
}

.education-section .cv-subtitle {
    color: var(--primary-color);
}

/* ====================================
   PORTFOLIO PREVIEW SECTION
   ==================================== */

.portfolio-preview {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.08), rgba(255, 107, 107, 0.08));
    text-align: center;
}

/* ====================================
   PORTFOLIO PAGE - HEADER
   ==================================== */

.portfolio-header {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(255, 107, 107, 0.1));
    text-align: center;
}

.portfolio-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.portfolio-header p {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* ====================================
   PORTFOLIO FILTERS
   ==================================== */

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-dark);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.95rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--bg-white);
    border-color: var(--primary-color);
}

/* ====================================
   PORTFOLIO GRID
   ==================================== */

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.portfolio-card {
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.8);
}

.portfolio-content {
    padding: var(--spacing-lg);
}

.portfolio-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.portfolio-category {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.portfolio-content p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tech-tag {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.portfolio-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
    font-weight: 600;
    transition: var(--transition);
}

.portfolio-link:hover {
    gap: var(--spacing-md);
}

/* ====================================
   CTA SECTION
   ==================================== */

.cta-section {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    text-align: center;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--bg-white);
}

.cta-section p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ====================================
   FOOTER
   ==================================== */

.footer {
    background: var(--bg-light);
    color: var(--text-light);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-social {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-white);
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 1.2rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.footer-social a:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    transform: translateY(-2px);
}

.footer-bottom p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ====================================
   RESPONSIVE DESIGN
   ==================================== */

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        min-height: auto;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg) 0 var(--spacing-xl);
    }

    .hero-content {
        padding-left: 0;
        padding-inline: var(--spacing-md);
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

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

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

    .cv-content {
        grid-template-columns: 1fr;
    }

    .cv-column {
        padding: var(--spacing-md);
    }

    .cv-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-brand {
        padding-left: var(--spacing-sm);
    }

    .nav-brand-name {
        font-size: 0.95rem;
        letter-spacing: 0.06em;
    }

    .nav-brand-role {
        font-size: 0.62rem;
        letter-spacing: 0.14em;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 0.9rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .site-notice {
        padding: 0.7rem var(--spacing-md);
    }

    .site-notice p {
        font-size: 0.9rem;
    }

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

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

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

    .cta-button {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.75rem 0;
    }

    .nav-container {
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero {
        gap: var(--spacing-md);
        padding: var(--spacing-md) 0 var(--spacing-lg);
    }

    .hero-content {
        padding-inline: 0;
    }

    .hero-title {
        font-size: 1.85rem;
        margin-bottom: var(--spacing-sm);
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: var(--spacing-sm);
    }

    .hero-description {
        font-size: 0.98rem;
        margin-bottom: var(--spacing-md);
    }

    .nav-brand {
        padding-left: 0;
    }

    .nav-brand::before {
        display: none;
    }

    .nav-brand-name {
        font-size: 0.95rem;
        letter-spacing: 0.04em;
    }

    .nav-brand-role {
        display: none;
    }

    .nav-menu {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: flex-start;
        gap: 0.35rem;
        width: 100%;
    }

    .nav-link {
        font-size: 0.82rem;
        padding: 0.35rem 0.55rem;
    }

    .theme-toggle {
        padding: 0.35rem;
        font-size: 1rem;
    }

    .social-links {
        gap: var(--spacing-sm);
    }

    .social-btn {
        width: 44px;
        height: 44px;
        font-size: 1.15rem;
    }

    .site-notice {
        padding: 0.6rem var(--spacing-sm);
    }

    .site-notice p {
        font-size: 0.82rem;
    }

    .portfolio-filters {
        gap: var(--spacing-sm);
    }

    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.85rem;
    }

    .hero-image img {
        max-width: 220px;
        height: 220px;
    }
}