@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
    --bg: #0d1117;
    --card-bg: #161b22;
    --card-hover: #1c2128;
    --accent: #4285f4;
    --accent-glow: transparent;
    --accent-hover: #3367d6;
    --text: #c9d1d9;
    --text-title: #ffffff;
    --text-muted: #8b949e;
    --border: #30363d;
    --border-highlight: #484f58;
    --code-bg: #21262d;
    --success: #3fb950;
    --nav-height: 70px;
}

[data-mode="light"] {
    --bg: #f6f8fa;
    --card-bg: #ffffff;
    --card-hover: #f3f4f6;
    --accent: #4285f4;
    --accent-glow: transparent;
    --accent-hover: #3367d6;
    --text: #24292f;
    --text-title: #1f2328;
    --text-muted: #57606a;
    --border: #d0d7de;
    --border-highlight: #afb8c1;
    --code-bg: #eff1f3;
}

[data-mode="light"] nav {
    background: rgba(255, 255, 255, 0.85);
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header & Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10%;
    height: var(--nav-height);
    background: rgba(22, 27, 34, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-title);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.nav-right-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Theme Mode Toggle (Dark / Light) */
.mode-toggle-btn {
    background: var(--code-bg);
    border: 1px solid var(--border);
    color: var(--text-title);
    font-size: 1.05rem;
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    outline: none;
}

.mode-toggle-btn:hover {
    border-color: var(--accent);
    transform: scale(1.08);
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease, text-shadow 0.2s ease;
    position: relative;
    padding: 6px 0;
}

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
}

/* Container */
.container {
    max-width: 900px;
    margin: 60px auto;
    padding: 0 24px;
    width: 100%;
    flex: 1;
}

/* Hero Section */
.hero {
    text-align: left;
    margin-bottom: 60px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 10px;
    letter-spacing: -1px;
    line-height: 1.2;
}

.tagline-container {
    display: flex;
    align-items: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 20px;
    min-height: 40px;
}

.typing-cursor {
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background-color: var(--accent);
    margin-left: 4px;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 680px;
    margin-bottom: 35px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: #0d1117;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--code-bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: #2d333b;
    border-color: var(--border-highlight);
    color: var(--text-title);
    box-shadow: none;
}

/* Skills Section */
.section-title {
    font-size: 1.5rem;
    color: var(--text-title);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 18px;
    margin-bottom: 60px;
}

.skill-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.skill-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-highlight);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.skill-icon {
    font-size: 1.6rem;
    margin-bottom: 10px;
}

.skill-card h3 {
    color: var(--text-title);
    font-size: 1.05rem;
    margin-bottom: 6px;
}

.skill-card p {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.5;
}

/* Project Cards */
.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px;
    margin-bottom: 24px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-highlight);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.project-title-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.project-card h3 {
    color: var(--text-title);
    font-size: 1.25rem;
    font-weight: 600;
}

.project-card h3 a {
    color: var(--text-title);
    text-decoration: none;
    transition: color 0.2s ease;
}

.project-card h3 a:hover {
    color: var(--accent);
}

.project-badge {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
}

.project-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.project-card p {
    color: var(--text-muted);
    font-size: 0.98rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.tech-stack {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Projects Layout with Sidebar */
.projects-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 28px;
    align-items: start;
}

.projects-sidebar {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    position: sticky;
    top: 90px;
}

.sidebar-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
    padding-left: 8px;
    font-family: 'JetBrains Mono', monospace;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 14px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.sidebar-btn:hover {
    background: var(--code-bg);
    color: var(--text-title);
    border-color: var(--border);
}

.sidebar-btn.active {
    background: var(--code-bg);
    border-color: var(--accent);
    color: var(--accent);
}

.sidebar-btn-badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 10px;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

/* Tech Table */
.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.9rem;
}

.tech-table th,
.tech-table td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}

.tech-table th {
    background: var(--code-bg);
    color: var(--text-title);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.tech-table td {
    background: var(--card-bg);
    color: var(--text);
}

.tech-table td strong {
    color: var(--text-title);
}

@media (max-width: 850px) {
    .projects-layout {
        grid-template-columns: 1fr;
    }

    .projects-sidebar {
        position: static;
    }
}

.tech {
    background: var(--code-bg);
    border: 1px solid var(--border);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
}

/* Contact Section */
.contact-container {
    max-width: 650px;
    margin: 40px auto;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 36px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    color: var(--accent);
    padding: 14px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.2s ease;
}

.contact-link:hover {
    border-color: var(--accent);
    background: #2d333b;
    transform: translateY(-2px);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
    text-align: left;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-title);
}

.form-group input,
.form-group textarea {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px 16px;
    color: var(--text-title);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

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

.form-status {
    padding: 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    display: none;
    text-align: center;
}

.form-status.success {
    display: block;
    background: rgba(63, 185, 80, 0.15);
    color: var(--success);
    border: 1px solid rgba(63, 185, 80, 0.3);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
    margin-top: auto;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Styles */
@media (max-width: 768px) {
    nav {
        padding: 0 20px;
    }

    .mobile-nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: var(--card-bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 20px 0;
        gap: 15px;
    }

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

    .nav-links a.active::after {
        display: none;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .tagline-container {
        font-size: 1.1rem;
    }

    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}