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

:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --border-color: #000000;
    --card-bg: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #ffffff;
    --border-color: #ffffff;
    --card-bg: #000000;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
}

nav ul {
    list-style-type: none;
    display: flex;
    gap: 2rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    text-transform: lowercase;
    transition: opacity 0.3s ease;
}

nav a:hover {
    opacity: 0.7;
}

#theme-toggle {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease;
}

#theme-toggle:hover {
    opacity: 0.7;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

section {
    margin-bottom: 4rem;
    padding: 2rem 0;
}

#hero {
    text-align: center;
    padding: 4rem 0;
    margin-bottom: 0px;
}

#hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 300;
}

#hero p {
    font-size: 1.2rem;
}

.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.profile-photo {
    width: 248px;
    height: 248px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.social-icons {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.social-icons a {
    color: var(--text-color);
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-icons a:hover {
    opacity: 0.7;
}

.social-icons .icon {
    width: 32px;
    height: 32px;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    font-weight: 300;
    text-transform: lowercase;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    border: 1px solid var(--border-color);
    padding: 2rem;
    background-color: var(--card-bg);
    transition: opacity 0.3s ease;
}

.project-card:hover {
    opacity: 0.7;
}

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 400;
    text-transform: lowercase;
}

.project-card p {
    font-size: 1rem;
}

.goals-container {
    margin-top: 2rem;
}

.goal-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.goal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.goal-text {
    font-size: 1.1rem;
    flex: 1;
}

.spoiler-button {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1rem;
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease, transform 0.3s ease;
    flex-shrink: 0;
}

.spoiler-button:hover {
    opacity: 0.7;
}

.spoiler-button.active {
    transform: rotate(180deg);
}

.chart-container {
    margin-top: 1.5rem;
    padding: 1rem 0;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bar-chart {
    width: 100%;
    height: 30px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background-color: var(--text-color);
    transition: width 0.8s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.5rem;
    color: var(--bg-color);
    font-size: 0.85rem;
    font-weight: 500;
}

.chart-controls {
    margin-top: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.chart-label {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

.progress-buttons {
    display: flex;
    gap: 0.5rem;
}

.progress-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.2rem;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease;
    font-weight: 300;
}

.progress-btn:hover {
    opacity: 0.7;
}

.progress-btn:active {
    transform: scale(0.95);
}

.progress-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

footer p {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    nav ul {
        gap: 1rem;
        font-size: 0.9rem;
    }

    main {
        padding: 2rem 1rem;
    }

    #hero h1 {
        font-size: 2rem;
    }

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