/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Variables */
:root {
    --primary-blue: #1d9bf0;
    --card-bg: #ffffff;
    --text-primary: #0f1419;
    --text-secondary: #536471;
    --border-color: #eff3f4;
    --hover-bg: #f7f9f9;
    --focus-ring: #1d9bf0;
}

/* Global styles */
body {
    font-family: "Segoe UI", Helvetica, Arial, sans-serif;
    background: linear-gradient(to bottom, #e8f5fe 0%, #f5f8fa 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* Main content area */
main {
    width: 100%;
    max-width: 600px;
}

/* Main card container */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 0;
    overflow: hidden;
}

/* Profile header - Avatar and name side by side (Twitter style) */
.profile-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--border-color);
}

.avatar-wrapper {
    flex-shrink: 0;
    margin: 0;
}

.avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--card-bg);
    display: block;
}

.profile-info {
    flex: 1;
    min-width: 0;
    padding-top: 4px;
}

.profile-info h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
    line-height: 1.3;
}

.username {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* Upload control styling */
.upload-control {
    margin-top: 8px;
}

.upload-control label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--primary-blue);
    cursor: pointer;
    padding: 6px 12px;
    font-weight: 500;
    border-radius: 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    transition: background 0.2s;
}

.upload-control input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Bio section */
.bio-section {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.bio {
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Metadata section (location and time) */
.metadata {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.metadata > div {
    display: flex;
    align-items: center;
    gap: 6px;
}

.metadata i {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.time-display {
    display: flex;
    align-items: baseline;
    gap: 5px;
}

.timestamp {
    font-family: "Courier New", Courier, monospace;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.unit {
    font-size: 0.75rem;
}

/* Section headings */
.section-heading {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

/* Social links section */
.social-links {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.social-links ul {
    list-style: none;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--card-bg);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.social-links i {
    font-size: 1.1rem;
}

/* Interests section (hobbies and dislikes) */
.interests-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    padding: 20px 24px;
}

.interests-column {
    padding: 0 12px;
}

.interests-column:first-child {
    border-right: 1px solid var(--border-color);
    padding-left: 0;
}

.interests-column:last-child {
    padding-right: 0;
}

.interests-column ul {
    list-style: none;
}

.interests-column li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.interests-column li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 1.2rem;
}

/* All Hovers and Focus styles for accessibility */
input:focus-visible,
button:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}


.social-links a:hover, .upload-control label:hover {
    background: var(--hover-bg);
    border-color: var(--primary-blue);
}

.social-links a:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* Stage 2 */
/* Page navigation buttons */
.page-navigation {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 24px;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--card-bg);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: var(--hover-bg);
    border-color: var(--primary-blue);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.nav-btn:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* Contact page styles */
.contact-card {
    max-width: 600px;
}

.contact-header {
    padding: 24px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.contact-header h1 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.contact-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Success banner */
.success-banner {
    display: none;
    align-items: flex-start;
    gap: 16px;
    margin: 24px;
    padding: 20px;
    background: #e8f5e9;
    border: 2px solid #4caf50;
    border-radius: 8px;
}

.success-banner i {
    font-size: 1.5rem;
    color: #4caf50;
    flex-shrink: 0;
}

.success-banner strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.success-banner p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* Contact form */
.contact-form {
    padding: 24px;
}

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

.form-field label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.required {
    color: #f4212e;
}

.form-field input,
.form-field textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-field input:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-field input.input-error,
.form-field textarea.input-error {
    border-color: #f4212e;
}

.form-field textarea {
    resize: vertical;
    min-height: 120px;
}

/* Error messages */
.error-text {
    display: none;
    color: #f4212e;
    font-size: 0.85rem;
    margin-top: 6px;
}

/* Submit button */
.submit-button {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: background 0.2s;
}

.submit-button:hover {
    background: #1a8cd8;
}

.submit-button:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* About page styles */
.about-card {
    max-width: 800px;
}

.about-header {
    padding: 24px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.about-header h1 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.about-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.about-section {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

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

.about-section h2 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-section h2 i {
    color: var(--primary-blue);
    font-size: 1.2rem;
}

.about-section p {
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.about-section p:last-child {
    margin-bottom: 0;
}

.about-section ul {
    list-style: none;
    padding-left: 0;
}

.about-section li {
    padding: 10px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.about-section li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 1.1rem;
}

/* Future note card */
.future-note {
    background: var(--hover-bg);
    border-left: 4px solid var(--primary-blue);
    padding: 20px;
    border-radius: 8px;
    font-style: italic;
}

.future-note p {
    margin-bottom: 12px;
}

.note-signature {
    text-align: right;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 16px;
    font-style: normal;
}

/* Responsive design with media queries*/
@media (max-width: 768px) {
    main {
        max-width: 100%;
    }

    .card {
        border-radius: 12px;
    }

    .profile-header {
        padding: 20px 16px 14px;
    }

    .avatar {
        width: 80px;
        height: 80px;
    }

    .profile-info h1 {
        font-size: 1.3rem;
    }

    .bio-section {
        padding: 16px;
    }

    .metadata {
        padding: 12px 16px;
        flex-direction: column;
        gap: 12px;
    }

    .social-links {
        padding: 16px;
    }

    .interests-wrapper {
        grid-template-columns: 1fr;
        padding: 16px;
        gap: 24px;
    }

    .interests-column {
        padding: 0 !important;
        border: none !important;
    }

    .interests-column:first-child {
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 20px !important;
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .profile-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 12px;
    }

    .avatar {
        width: 90px;
        height: 90px;
    }

    .profile-info {
        width: 100%;
    }

    .upload-control {
        display: flex;
        justify-content: center;
    }

    .social-links ul {
        align-items: flex-end;
    }
}

/* Responsive adjustments for Stage 1 pages */
@media (max-width: 768px) {
    .page-navigation {
        gap: 8px;
    }

    .nav-btn {
        padding: 8px 14px;
        font-size: 0.85rem;
    }

    .contact-card,
    .about-card {
        max-width: 100%;
    }

    .contact-header,
    .about-header {
        padding: 20px 16px 16px;
    }

    .contact-form,
    .about-section {
        padding: 20px 16px;
    }

    .about-section h2 {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .page-navigation {
        flex-direction: column;
        width: 100%;
    }

    .nav-btn {
        width: 100%;
        justify-content: center;
    }

    .contact-header h1,
    .about-header h1 {
        font-size: 1.5rem;
    }

    .success-banner {
        flex-direction: column;
        text-align: center;
    }
}