/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Monochrome Color Palette */
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-surface-elevated: #1a1a1a;

    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #707070;

    --color-accent: #ffffff;
    --color-border: #2a2a2a;
    --color-hover: #f5f5f5;

    /* Typography */
    --font-primary: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

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

[data-theme="light"] {
    --color-bg: #ffffff;
    --color-surface: #f8f8f8;
    --color-surface-elevated: #f0f0f0;

    --color-text-primary: #0a0a0a;
    --color-text-secondary: #606060;
    --color-text-tertiary: #909090;

    --color-accent: #0a0a0a;
    --color-border: #e0e0e0;
    --color-hover: #0a0a0a;
}

html {
    scroll-behavior: smooth;
}

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

/* ===== SIDEBAR NAVIGATION ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 280px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl) var(--spacing-lg);
    z-index: 1000;
    transition: all var(--transition);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-3xl);
}

.sidebar-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--color-surface-elevated);
    transform: rotate(180deg);
}

.theme-icon {
    font-size: 1.2rem;
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--color-text-secondary);
    border-radius: 8px;
    transition: all var(--transition);
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    background: var(--color-accent);
    transition: height var(--transition);
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-text-primary);
    background: var(--color-surface-elevated);
}

.nav-item.active::before {
    height: 60%;
}

.nav-number {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.5;
}

.nav-text {
    font-weight: 500;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.social-icons {
    display: flex;
    gap: var(--spacing-sm);
}

.social-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    transition: all var(--transition);
}

.social-icon:hover {
    background: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    margin-left: 280px;
    min-height: 100vh;
}

/* ===== SECTIONS ===== */
section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) var(--spacing-2xl);
}

.section-container {
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

.section-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

/* ===== HERO SECTION ===== */
.hero-section {
    position: relative;
    padding: var(--spacing-3xl) var(--spacing-2xl);
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.hero-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 6rem;
    font-weight: 700;
    line-height: 0.95;
    margin-bottom: var(--spacing-lg);
}

.title-line {
    display: block;
}

.title-line.accent {
    font-style: italic;
    opacity: 0.5;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

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

.cta-button {
    padding: var(--spacing-md) var(--spacing-xl);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 0;
    transition: all var(--transition);
    display: inline-block;
}

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

.cta-button.primary:hover {
    background: transparent;
    color: var(--color-accent);
}

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

.cta-button.secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.hero-decoration {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.decoration-circle {
    width: 300px;
    height: 300px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    position: absolute;
}

.circle-1 {
    animation: rotate 20s linear infinite;
}

.circle-2 {
    width: 200px;
    height: 200px;
    top: 50px;
    left: 50px;
    animation: rotate 15s linear infinite reverse;
}

.decoration-line {
    width: 2px;
    height: 150px;
    background: var(--color-border);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

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

    to {
        transform: rotate(360deg);
    }
}

/* ===== ABOUT SECTION ===== */
.about-section {
    background: var(--color-surface);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-xl);
}

.about-text {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.stat-box {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.stat-box:hover {
    border-color: var(--color-accent);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ===== PROJECTS SECTION ===== */
.projects-list {
    margin-top: var(--spacing-xl);
}

.project-item {
    display: grid;
    grid-template-columns: 80px 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

.project-item:hover {
    padding-left: var(--spacing-md);
}

.project-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-tertiary);
}

.project-info {
    flex: 1;
}

.project-name {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.project-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.project-tags {
    display: flex;
    gap: var(--spacing-sm);
}

.project-tag {
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-link {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition);
}

.project-link:hover {
    color: var(--color-accent);
    transform: translateX(5px);
}

/* ===== SKILLS SECTION ===== */
.skills-section {
    background: var(--color-surface);
}

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

.skill-card {
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.skill-card:hover {
    border-color: var(--color-accent);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.skill-icon {
    font-size: 2rem;
}

.skill-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
}

.skill-items {
    list-style: none;
}

.skill-items li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

.skill-items li:last-child {
    border-bottom: none;
}

/* ===== CONTACT SECTION ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-xl);
}

.contact-text {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.contact-details {
    margin-bottom: var(--spacing-xl);
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.detail-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
}

.detail-value {
    font-size: 1.125rem;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.detail-value:hover {
    color: var(--color-accent);
}

.contact-social {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-link {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
}

.social-link:hover {
    background: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

/* ===== CONTACT FORM ===== */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.field-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.field-input,
.field-textarea {
    padding: var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition);
}

.field-input:focus,
.field-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.field-textarea {
    resize: vertical;
    min-height: 150px;
}

.form-submit {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-accent);
    color: var(--color-bg);
    border: 2px solid var(--color-accent);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.form-submit:hover {
    background: transparent;
    color: var(--color-accent);
}

/* ===== FOOTER ===== */
.footer {
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.footer-top {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-top:hover {
    color: var(--color-accent);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .main-content {
        margin-left: 200px;
    }

    .hero-title {
        font-size: 4rem;
    }

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

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

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

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

    .hero-title {
        font-size: 3rem;
    }

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

    .project-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .project-number {
        font-size: 1.5rem;
    }

    .hero-decoration {
        display: none;
    }
}