* {
    box-sizing: border-box;
}

:root {
    --bg: #f1f3f4;
    --surface: #ffffff;
    --toolbar: #dee1e6;
    --tab-inactive: #c9cdd4;
    --border: #c4c7cc;
    --text: #202124;
    --text-secondary: #5f6368;
    --accent: #1a73e8;
    --accent-hover: #1557b0;
}

body {
    background-color: var(--bg);
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
}

h1 {
    color: var(--accent);
}

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

nav {
    background-color: var(--toolbar);
    position: sticky;
    top: 0;
    z-index: 100;
}

.title-bar {
    display: flex;
    align-items: flex-end;
    padding: 10px 12px 0;
    gap: 2px;
    top: 0;
}

.window-controls {
    display: flex;
    gap: 6px;
    align-items: center;
    padding-bottom: 10px;
    padding-right: 8px;
}

.wc-dot {
    width: 13px;
    height: 13px;
    border-radius: 50%;
}

.wc-dot.red { background-color: #ea4335; }
.wc-dot.yellow { background-color: #fbbc04; }
.wc-dot.green { background-color: #34a853; }

.nav-logo {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    padding-bottom: 10px;
    letter-spacing: -0.02em;
    margin-right: 8px;
    font-family: 'Google Sans', sans-serif;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 2px;
}

nav ul::-webkit-scrollbar {
    display: none;
}

.tab-link {
    display: block;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13px;
    padding: 8px 20px;
    background-color: var(--tab-inactive);
    border-radius: 8px 8px 0 0;
    border: 1px solid transparent;
    border-bottom: none;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.tab-link:hover {
    background-color: #d1d4da;
    color: var(--text);
}

.tab-link.active-tab {
    background-color: var(--surface);
    color: var(--text);
    border-color: var(--border);
}

nav a {
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 8px 8px 0 0;
    background-color:var(--tab-inactive);
}

nav a:hover {
    background-color: var(--surface);
}

.address-bar {
    background-color: var(--toolbar);
    padding: 8px 24px 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
}

.address-bar .lock-icon {
    font-size: 13px;
}

.address-text {
    background: var(--surface);
    border: 1px solid transparent;
    border-radius: 24px;
    padding: 6px 16px;
    font-size: 14px;
    color: var(--text);
    width: 300px;
    font-family: 'Roboto Mono', monospace;
}

header {
    background: linear-gradient(145deg, #e8f0fe 0%, #fce8e6 40%, #e6f4ea 80%, #fef7e0 100%);
    background-color: var(--surface);
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 12px;
    font-family: 'Google Sans', sans-serif;
}

.hero-name {
    background: linear-gradient(90deg, #4285f4, #ea4335, #fbbc04, #34a853);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

section {
    padding: 48px 40px;
    border-top: 1px solid #dee1e6;
}

section h2 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 16px;
    font-family: 'Google Sans', sans-serif;
}

footer {
    text-align: center;
    padding: 24px;
    background-color: var(--toolbar);
    color: var(--text-secondary);
    font-size: 13px;
}

.about-grid {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.about-text {
    flex: 1;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-text p {
    margin-bottom: 12px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 28px;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    padding: 10px 24px;
    border-radius: 24px;
    font-family: 'Google Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 2px 8px rgba(26, 115, 232, 0.35);
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    padding: 9px 22px;
    border-radius: 24px;
    font-family: 'Google Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: rgba(26, 115, 232, 0.07);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--toolbar);
    border-radius: 12px;
    padding: 20px 32px;
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.projects-grid {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.project-card {
    background: var(--surface);
    border: 1px solid var(--toolbar);
    border-radius: 12px;
    padding: 0;
    flex: 1;
    min-width: 250px;
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}

.project-card:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

.card-top {
    height: 8px;
    width: 100%;
}

.card-body {
    padding: 20px 24px 24px;
}

.project-card h3 {
    color: var(--text);
    margin-bottom: 10px;
    font-family: 'Google Sans', sans-serif;
    font-size: 16px;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.tag {
    background: #e8f0fe;
    color: var(--accent);
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
}

.project-card a {
    text-decoration: none;
    color: var(--accent);
    font-size: 14px;
    font-weight: 500;
}

.project-card a:hover {
    text-decoration: underline;
}

.skills-grid {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.skill-group {
    flex: 1;
    min-width: 260px;
}

.skill-group h3 {
    color: var(--text);
    margin-bottom: 16px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.skill-item {
    margin-bottom: 16px;
}

.skill-row {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6 px;
}

.skill-bar-bg {
    background: #e8eaed;
    border-radius: 4px;
    height: 6px;
}

.skill-bar-fill {
    background: var(--accent);
    height: 6px;
    border-radius: 4px;
    transition: width 1s ease;
}

.contact-grid {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.contact-info {
    flex: 1;
    color: var(--text-secondary);
    line-height: 1.8;
}

.contact-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.contact-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--toolbar);
    font-size: 14px;
}

.contact-form {
    flex: 1;
    background: #f8f9fa;
    border: 1px solid var(--toolbar);
    border-radius: 12px;
    padding: 28px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--toolbar);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

button[type="submit"] {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: var(--surface);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

button[type="submit"]:hover {
    background: var(--accent-hover);
}

@media (max-width: 768px) {
    .about-grid {
        flex-direction: column;
    }

    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .stat-card {
        flex: 1;
        min-width: 120px;
    }

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

    .contact-form {
        width: 100%;
    }

    .contact-info {
        width: 100%;
    }

    .projects-grid {
        flex-direction: column;
    }

    .skills-grid {
        flex-direction: column;
    }

    header {
        padding: 40px 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    section {
        padding: 32px 20px;
    }

    .address-text {
        width: 100%;
    }

    nav ul {
        overflow-x: auto;
        scrollbar-width: none;
    }
}