:root {
    --bg-primary: #10111a;
    --bg-card: #1d1e2b;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #4a90e2;
    --border-color: #3a3c5a;
    --border-color-light: rgba(255,255,255,0.06);
}

html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    margin: 0;
    box-sizing: border-box;
}

.profile-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.card-header {
    margin-bottom: 16px;
}

.card-header img {
    width: 120px;
    height: 120px;
    max-width: 25vw; 
    max-height: 25vw;
    min-width: 60px;
    min-height: 60px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    object-fit: cover;
}

.card-header h2 {
    margin: 10px 0 0;
    font-size: 1.8rem;
    color: white;
}

.bio {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.time-container {
    background-color: var(--bg-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, 'Roboto Mono', 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 20px;
    word-break: normal;
    overflow-wrap: anywhere; 
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 24px;
}

.social-links a {
    color: var(--text-primary);
    background-color: var(--border-color);
    padding: 12px 22px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.social-links a:hover {
    background-color: var(--accent);
    transform: translateY(-3px); 
}

.social-links a:focus {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px rgba(74,144,226,0.12);
}

@media (prefers-reduced-motion: reduce) {
    .social-links a { transition: none; transform: none; }
}

.user-list {
    background-color: #252836;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    text-align: left;
}

.user-list h3 {
    margin: 0 0 10px 0;
    color: var(--accent);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.user-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.user-list li {
    padding: 5px 0;
    color: var(--text-secondary);
}

@media (min-width: 600px) {
    .profile-card {
        display: grid;
        grid-template-areas:
            "header  bio"
            "header  time"
            "header  social"
            "lists   lists";
        grid-template-columns: 150px 1fr;
        gap: 20px;
        text-align: left;
    }

    .card-header {
        grid-area: header;
        margin: 0;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
    }

    .bio {
        grid-area: bio;
        margin: 0;
    }

    .time-container {
        grid-area: time;
        margin: 0;
    }

    .social-links {
        grid-area: social;
        justify-content: flex-start;
        margin: 0;
    }

    .user-list {
        grid-area: lists;
    }
}

.lists { grid-area: lists; display: flex; gap: 16px; flex-direction: column; }
@media (min-width: 600px) {
    .lists { flex-direction: row; }
    .lists .user-list { flex: 1; }
}

.card-header { text-align: center; }
@media (min-width: 600px) { .card-header { text-align: left; } }

.main-nav {
    background-color: var(--border-color);
    width: 100%;
    padding: 10px 0;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.main-nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    padding: 10px 15px;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.main-nav a:hover,
.main-nav a:focus {
    background-color: var(--accent);
    outline: none;
}

.page-container,
.profile-card {
    padding-top: 80px; 
    max-width: 800px;
    margin: 0 auto; 
}

.profile-card {
    padding-top: 90px; 
    padding-bottom: 30px;
}

h1 {
    color: var(--accent);
    text-align: center;
    margin-bottom: 20px;
}

.page-container p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
    box-sizing: border-box; 
}

.form-group textarea {
    resize: vertical; 
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background-color: var(--accent);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-btn:hover,
.submit-btn:focus {
    background-color: #3a7bc8; 
}

.form-message {
    font-size: 0.9rem;
    margin-top: 5px;
    display: none; 
}

.error-message {
    color: #ff6b6b; 
    display: block;
    min-height: 1em; 
}

.success-message {
    color: #51cf66; 
    background-color: rgba(81, 207, 102, 0.1);
    border: 1px solid rgba(81, 207, 102, 0.5);
    padding: 15px;
    border-radius: 6px;
    text-align: center;
    margin-bottom: 20px;
}

.page-container section {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.page-container section h2 {
    color: var(--accent);
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.page-container section p {
    text-align: left;
    line-height: 1.7;
    color: var(--text-secondary);
}

@media (max-width: 600px) {
    .main-nav ul {
        gap: 5px;
    }
    .main-nav a {
        padding: 8px 10px;
        font-size: 0.95rem;
    }
}

/* Skip link utility */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus {
    position: static;
    left: auto;
    width: auto;
    height: auto;
    padding: 8px 12px;
    background: var(--accent);
    color: #fff;
    z-index: 2000;
}