/* VARIABLES — LIGHT */
:root {
    --bg: #f4f4f4;
    --bg-white: #ffffff;
    --accent: #b04a32;
    --accent-hover: #963d28;
    --text: #0f0f0f;
    --text-mid: #555555;
    --text-muted: #999999;
    --border: #d8d8d8;
    --code-tag: rgba(176, 74, 50, 0.6);
    --code-attr: rgba(140, 90, 20, 0.6);
    --code-str: rgba(140, 50, 30, 0.6);
    --code-com: rgba(100, 100, 100, 0.5);
    --code-txt: rgba(40, 40, 40, 0.55);
    --code-ln: rgba(0, 0, 0, 0.22);
    --code-num: rgba(0, 80, 140, 0.55);
    --cta-text: #ffffff;
}

/* VARIABLES — DARK */
[data-theme="dark"] {
    --bg: #0e0e10;
    --bg-white: #18181b;
    --accent: #2ea958;
    --accent-hover: #36c266;
    --text: #ededed;
    --text-mid: #a0a0a0;
    --text-muted: #6a6a6a;
    --border: #2a2a2c;
    --code-tag: rgba(86, 200, 130, 0.55);
    --code-attr: rgba(220, 180, 90, 0.55);
    --code-str: rgba(220, 140, 110, 0.55);
    --code-com: rgba(150, 175, 145, 0.45);
    --code-txt: rgba(220, 220, 220, 0.5);
    --code-ln: rgba(255, 255, 255, 0.2);
    --code-num: rgba(150, 200, 230, 0.55);
    --cta-text: #0e0e10;
}

/* RESET */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    font-size: 16px;
    transition: background 0.3s ease, color 0.3s ease;
}

/* NAVBAR */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.navbar-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-mid);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.2s;
}

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

/* NAV ACTIONS */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: 2rem;
}

/* THEME TOGGLE */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: border-color 0.2s, background 0.2s, transform 0.2s;
    padding: 0;
}

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

.theme-icon {
    width: 16px;
    height: 16px;
}

.theme-icon.sun { display: none; }
.theme-icon.moon { display: block; }

[data-theme="dark"] .theme-icon.sun { display: block; }
[data-theme="dark"] .theme-icon.moon { display: none; }

/* HAMBURGER */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
}

/* HERO */
.hero {
    min-height: calc(100vh - 61px);
    display: flex;
    align-items: center;
    padding: 4rem 2rem;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

/* CODE BACKGROUND — VS Code style */
.hero-code {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    -webkit-mask-image: radial-gradient(ellipse 70% 80% at 100% 100%, rgba(0,0,0,1) 0%, rgba(0,0,0,0.8) 40%, rgba(0,0,0,0.3) 70%, transparent 100%);
    mask-image: radial-gradient(ellipse 70% 80% at 100% 100%, rgba(0,0,0,1) 0%, rgba(0,0,0,0.8) 40%, rgba(0,0,0,0.3) 70%, transparent 100%);
}

.hero-code pre {
    position: absolute;
    bottom: 1rem;
    right: 0;
    margin: 0;
    padding: 1rem 2.5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 17px;
    line-height: 1.7;
    white-space: pre;
    filter: blur(0.4px);
    color: var(--code-txt);
}

.hero-code .ln { color: var(--code-ln); user-select: none; padding-right: 0.6rem; }
.hero-code .t { color: var(--code-tag); font-weight: 600; }
.hero-code .a { color: var(--code-attr); }
.hero-code .s { color: var(--code-str); }
.hero-code .c { color: var(--code-com); font-style: italic; }
.hero-code .txt { color: var(--code-txt); }
.hero-code .n { color: var(--code-num); }

.hero-inner {
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(48px, 6.5vw, 88px);
    font-weight: 800;
    line-height: 1.0;
    letter-spacing: -2px;
    color: var(--text);
}

.hero-line {
    width: 50px;
    height: 3px;
    background: var(--accent);
    margin-top: 2rem;
}

.hero-desc {
    color: var(--text-mid);
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

.cta-button {
    display: inline-block;
    background: var(--text);
    color: var(--cta-text);
    padding: 14px 36px;
    border-radius: 2px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.5px;
    transition: background 0.2s, transform 0.2s, color 0.2s;
}

.cta-button:hover {
    background: var(--accent);
    color: #ffffff;
    transform: translateY(-2px);
}

/* SECTIONS */
section {
    padding: 6rem 2rem;
    border-bottom: 1px solid var(--border);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 3rem;
}

.section-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 2px;
}

.section-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

/* ABOUT */
.about {
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 5rem;
    align-items: start;
}

.about-text p {
    color: var(--text-mid);
    margin-bottom: 1.5rem;
    font-size: 16px;
    line-height: 1.9;
}

.about-list ul {
    list-style: none;
    border-left: 2px solid var(--accent);
    padding-left: 1.5rem;
}

.about-list li {
    color: var(--text-mid);
    font-size: 15px;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
}

.about-list li:last-child {
    border-bottom: none;
}

/* SKILLS */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.skill-card {
    background: var(--bg-white);
    padding: 2rem;
    transition: background 0.2s;
}

.skill-card:hover {
    background: var(--bg);
}

.skill-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.7rem;
}

.skill-card p {
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.7;
}

/* EXPERIENCE */
.experience {
    background: var(--bg-white);
}

.exp-item {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 3rem;
    align-items: start;
}

.exp-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 3px;
}

.exp-date {
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.3px;
}

.exp-org {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

.exp-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1.2rem;
}

.exp-content ul {
    list-style: none;
}

.exp-content li {
    display: flex;
    gap: 0.8rem;
    align-items: baseline;
    color: var(--text-mid);
    font-size: 14px;
    padding: 0.55rem 0;
    border-bottom: 1px solid var(--border);
}

.exp-content li:last-child {
    border-bottom: none;
}

.exp-content li::before {
    content: '—';
    color: var(--accent);
    font-size: 12px;
    flex-shrink: 0;
}

/* PROJECTS */
.projects {
    background: var(--bg);
}

.project-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    padding: 2.5rem;
    border-radius: 2px;
    transition: box-shadow 0.2s;
}

.project-card:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-header h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.project-links {
    display: flex;
    gap: 1.2rem;
    align-items: center;
}

.project-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: opacity 0.2s;
}

.project-link:hover {
    opacity: 0.65;
}

.project-link.secondary {
    color: var(--text-muted);
}

.project-description {
    color: var(--text-mid);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-features ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.project-features li {
    display: flex;
    gap: 0.8rem;
    align-items: baseline;
    color: var(--text-muted);
    font-size: 14px;
    padding: 0.3rem 0;
}

.project-features li::before {
    content: '✓';
    color: var(--accent);
    font-size: 12px;
    flex-shrink: 0;
    font-weight: 700;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.tech-tag {
    background: var(--bg);
    color: var(--text-mid);
    padding: 4px 12px;
    border-radius: 2px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--border);
}

/* CONTACT */
.contact {
    background: var(--bg-white);
}

.contact-content > p {
    color: var(--text-mid);
    font-size: 16px;
    max-width: 520px;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.contact-link {
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 22px;
    border: 1px solid var(--border);
    border-radius: 2px;
    transition: all 0.2s;
    background: var(--bg);
}

.contact-link:hover {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
    transform: translateY(-2px);
}

.form-note {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 16px;
    border-radius: 2px;
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.2s;
}

.contact-form textarea {
    margin-bottom: 1rem;
    resize: vertical;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-muted);
}

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

.submit-btn {
    background: var(--text);
    color: var(--cta-text);
    padding: 12px 32px;
    border: none;
    border-radius: 2px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s, color 0.2s;
    letter-spacing: 0.3px;
}

.submit-btn:hover {
    background: var(--accent);
    color: #ffffff;
    transform: translateY(-1px);
}

/* FOOTER — always dark for contrast */
.footer {
    background: #0a0a0a;
    color: #999999;
    padding: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}

/* RESPONSIVE — TABLET */
@media (max-width: 900px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

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

    .exp-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* RESPONSIVE — MOBILE */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .hero-code {
        opacity: 0.4;
    }

    .hero-code pre {
        font-size: 10px;
        line-height: 1.7;
        padding: 1rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        padding: 0.5rem 2rem 1rem;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        border-bottom: 1px solid var(--border);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .nav-links a {
        display: block;
        padding: 0.8rem 0;
    }

    section {
        padding: 4rem 1.5rem;
    }

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

    .project-header {
        flex-direction: column;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer {
        flex-direction: column;
        gap: 0.4rem;
        text-align: center;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .navbar-container {
        padding: 1rem 1.5rem;
    }

    .hero {
        padding: 3rem 1.5rem;
        min-height: auto;
    }

    .hero h1 {
        letter-spacing: -1px;
    }

    .contact-links {
        flex-direction: column;
    }

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