/* =========================
   CSS Reset & Base Styles
   ========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-border: #e5e7eb;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --max-width: 900px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #3b82f6;
        --color-primary-hover: #60a5fa;
        --color-text: #f9fafb;
        --color-text-light: #9ca3af;
        --color-border: #374151;
        --color-bg: #111827;
        --color-bg-alt: #1f2937;
    }

    body {
        background-color: var(--color-bg);
    }

    .profile-img {
        border-color: var(--color-primary);
    }

    .project-card,
    .tool-item {
        background: linear-gradient(135deg, rgba(55, 65, 81, 0.4) 0%, rgba(31, 41, 55, 0.5) 100%);
        border-color: var(--color-border);
    }

    .project-card:hover,
    .tool-item:hover {
        background: linear-gradient(135deg, rgba(55, 65, 81, 0.6) 0%, rgba(31, 41, 55, 0.7) 100%);
        box-shadow: 0 12px 24px rgba(59, 130, 246, 0.2);
    }

    .project-name,
    .project-description,
    .tool-item {
        color: var(--color-text);
    }

    .project-icon {
        filter: brightness(1.2);
    }

    .modal-overlay {
        background: rgba(0, 0, 0, 0.8);
    }

    .modal-content {
        background: rgba(17, 24, 39, 0.95);
        border: 1px solid rgba(75, 85, 99, 0.3);
    }

    .modal-contact-item {
        background: rgba(31, 41, 55, 0.6);
        border-color: rgba(75, 85, 99, 0.3);
    }

    .modal-contact-item:hover {
        background: rgba(31, 41, 55, 0.9);
        border-color: var(--color-primary);
    }

    .contact-link:hover {
        background-color: var(--color-bg-alt);
    }

    .btn-primary {
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    }

    .btn-secondary:hover {
        background-color: var(--color-primary);
    }

    .claude-link:hover {
        background-color: var(--color-bg-alt);
    }

    .modal-close:hover {
        background: var(--color-bg-alt);
    }

    .section-alt {
        background-color: var(--color-bg-alt);
    }

    .modal-card {
        background-color: var(--color-bg-alt);
        border-color: var(--color-border);
    }

    .modal-card:hover {
        box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
    }

    .personal-img {
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    }

    .book-card {
        background: var(--color-bg);
        border-color: var(--color-border);
    }

    .book-card:hover {
        box-shadow: 0 4px 16px rgba(59, 130, 246, 0.2);
    }

    @media (max-width: 480px) {
        .sub-tab-button.active {
            background-color: var(--color-bg-alt);
        }

        .modal-close {
            background-color: var(--color-bg);
            border-color: var(--color-border);
        }
    }
}

/* =========================
   Dark Mode Toggle Button
   ========================= */
.dark-mode-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    background-color: var(--color-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin: var(--spacing-lg) auto 0;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.dark-mode-toggle svg {
    color: var(--color-text);
    transition: var(--transition);
}

.sun-icon,
.moon-icon {
    position: absolute;
}

/* Show sun in light mode, moon in dark mode */
body:not(.dark-mode) .moon-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

body:not(.dark-mode) .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

body.dark-mode .sun-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

body.dark-mode .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* Light mode - overrides system dark preference */
body.light-mode {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-border: #e5e7eb;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    background-color: var(--color-bg);
}

body.light-mode .profile-img {
    border-color: var(--color-primary);
}

body.light-mode .project-card,
body.light-mode .tool-item {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-color: var(--color-border);
}

body.light-mode .project-card:hover,
body.light-mode .tool-item:hover {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.15);
}

body.light-mode .modal-overlay {
    background: rgba(0, 0, 0, 0.5);
}

body.light-mode .modal-content {
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(20px);
}

body.light-mode .modal-contact-item {
    background: var(--color-bg-alt);
    border-color: var(--color-border);
}

body.light-mode .modal-contact-item:hover {
    background: #ffffff;
    border-color: var(--color-primary);
}

body.light-mode .btn-primary {
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

body.light-mode .section-alt {
    background-color: var(--color-bg-alt);
}

body.light-mode .modal-card {
    background-color: var(--color-bg-alt);
    border-color: var(--color-border);
}

body.light-mode .modal-card:hover {
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.15);
}

body.light-mode .book-card {
    background: var(--color-bg);
    border-color: var(--color-border);
}

body.light-mode .book-card:hover {
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.1);
}

@media (max-width: 480px) {
    body.light-mode .sub-tab-button.active {
        background-color: var(--color-bg-alt);
    }

    body.light-mode .modal-close {
        background-color: var(--color-bg);
        border-color: var(--color-border);
    }
}

/* Dark mode styles when class is applied */
body.dark-mode {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-text: #f9fafb;
    --color-text-light: #9ca3af;
    --color-border: #374151;
    --color-bg: #111827;
    --color-bg-alt: #1f2937;
    background-color: var(--color-bg);
}

body.dark-mode .profile-img {
    border-color: var(--color-primary);
}

body.dark-mode .project-card,
body.dark-mode .tool-item {
    background: linear-gradient(135deg, rgba(55, 65, 81, 0.4) 0%, rgba(31, 41, 55, 0.5) 100%);
    border-color: var(--color-border);
}

body.dark-mode .project-card:hover,
body.dark-mode .tool-item:hover {
    background: linear-gradient(135deg, rgba(55, 65, 81, 0.6) 0%, rgba(31, 41, 55, 0.7) 100%);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.2);
}

body.dark-mode .project-name,
body.dark-mode .project-description,
body.dark-mode .tool-item {
    color: var(--color-text);
}

body.dark-mode .project-icon {
    filter: brightness(1.2);
}

body.dark-mode .modal-overlay {
    background: rgba(0, 0, 0, 0.8);
}

body.dark-mode .modal-content {
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid rgba(75, 85, 99, 0.3);
}

body.dark-mode .modal-contact-item {
    background: rgba(31, 41, 55, 0.6);
    border-color: rgba(75, 85, 99, 0.3);
}

body.dark-mode .modal-contact-item:hover {
    background: rgba(31, 41, 55, 0.9);
    border-color: var(--color-primary);
}

body.dark-mode .contact-link:hover {
    background-color: var(--color-bg-alt);
}

body.dark-mode .btn-primary {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

body.dark-mode .btn-secondary:hover {
    background-color: var(--color-primary);
}

body.dark-mode .claude-link:hover {
    background-color: var(--color-bg-alt);
}

body.dark-mode .modal-close:hover {
    background: var(--color-bg-alt);
}

body.dark-mode .section-alt {
    background-color: var(--color-bg-alt);
}

body.dark-mode .inline-link {
    color: var(--color-primary);
}

body.dark-mode .section-link {
    color: var(--color-primary);
}

body.dark-mode .principle-icon {
    color: var(--color-primary);
}

body.dark-mode .modal-card {
    background-color: var(--color-bg-alt);
    border-color: var(--color-border);
}

body.dark-mode .modal-card:hover {
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
}

body.dark-mode .personal-img {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

body.dark-mode .book-card {
    background: var(--color-bg);
    border-color: var(--color-border);
}

body.dark-mode .book-card:hover {
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.2);
}

@media (max-width: 480px) {
    body.dark-mode .sub-tab-button.active {
        background-color: var(--color-bg-alt);
    }

    body.dark-mode .modal-close {
        background-color: var(--color-bg);
        border-color: var(--color-border);
    }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =========================
   Layout
   ========================= */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.section {
    margin-bottom: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

/* =========================
   Hero Section
   ========================= */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    margin-bottom: 0;
}

.profile-photo {
    margin-bottom: var(--spacing-lg);
}

.profile-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.name {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    letter-spacing: -0.025em;
}

.title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.tagline {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 650px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.7;
}

.tagline-bold {
    font-size: 1.145rem;
    font-weight: 350;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1rem;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: 2px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* =========================
   About Section
   ========================= */
.about-text {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    line-height: 1.8;
    max-width: 800px;
    margin-bottom: var(--spacing-md);
}

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

/* =========================
   Projects Section
   ========================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, #ffffff 100%);
    border-radius: 12px;
    border: 2px solid var(--color-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), #60a5fa);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.15);
    border-color: var(--color-primary);
}

.project-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.project-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.external-link {
    flex-shrink: 0;
    opacity: 0.4;
    transition: var(--transition);
}

.project-card:hover .external-link {
    opacity: 1;
    transform: translate(2px, -2px);
}

.project-description {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* =========================
   Tools Section
   ========================= */
.tools-intro {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.tool-item {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, #ffffff 100%);
    border: 2px solid var(--color-border);
    border-radius: 10px;
    text-align: center;
    font-weight: 500;
    color: var(--color-text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9375rem;
}

.tool-item:hover {
    border-color: var(--color-primary);
    background: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.1);
}

/* =========================
   Background Section
   ========================= */
.background-text p {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.background-text p:last-child {
    margin-bottom: 0;
}

/* =========================
   Contact Section
   ========================= */
.contact-section,
.social-links {
    text-align: center;
}

.contact-intro {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

/* =========================
   Contact Modal
   ========================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 900px;
    width: 90%;
    max-height: 90vh;
    padding: var(--spacing-2xl);
    position: relative;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    overflow-y: auto;
    margin: auto;
}

/* Contact Modal - Original Design */
#contactModal .modal-content {
    max-width: 500px;
    width: 100%;
    padding: var(--spacing-2xl);
}

#contactModal .modal-header {
    border-bottom: none;
    margin-bottom: var(--spacing-xl);
    padding-bottom: 0;
}

#contactModal .modal-header h2 {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-xs);
}

#contactModal .modal-header p {
    font-size: 1rem;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--color-text-light);
    transition: var(--transition);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
    transform: rotate(90deg);
}

.modal-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: 0;
}

.modal-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    line-height: 1.3;
}

.modal-header p {
    color: var(--color-text-light);
    font-size: 1.125rem;
    line-height: 1.6;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-body > p:first-child {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

/* Modal Cards */
.modal-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.modal-card {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 2px solid var(--color-border);
    transition: var(--transition);
}

.modal-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.15);
    transform: translateY(-2px);
}

.modal-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.modal-card p {
    margin: 0;
    line-height: 1.7;
    font-size: 1rem;
    color: var(--color-text);
}

/* Framework Cards (2x2 grid) */
.framework-cards {
    grid-template-columns: repeat(2, 1fr);
}

/* Modal Badge */
.modal-badge {
    display: inline-block;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 24px;
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.5px;
}

/* Modal Sections */
.modal-section {
    margin: var(--spacing-lg) 0;
}

.modal-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.modal-section p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    font-size: 1.0625rem;
}

.modal-section:first-child {
    margin-top: 0;
}

/* Modal List */
.modal-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
}

.modal-list li {
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    position: relative;
    line-height: 1.7;
    font-size: 1.0625rem;
}

.modal-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.25rem;
}

/* Modal Closing Paragraph */
.modal-closing {
    margin-top: var(--spacing-lg);
    padding-top: 0;
    font-style: italic;
    color: var(--color-text-light);
    font-size: 1.0625rem;
    line-height: 1.7;
}

.modal-contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(37, 99, 235, 0.1);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.modal-contact-item:hover {
    background: rgba(255, 255, 255, 1);
    border-color: var(--color-primary);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.modal-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), #60a5fa);
    border-radius: 12px;
    color: white;
}

.modal-contact-details {
    flex: 1;
    text-align: left;
}

.modal-contact-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.modal-contact-value {
    font-size: 0.9375rem;
    color: var(--color-text-light);
}

/* =========================
   Contact Links Section
   ========================= */
.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-sm);
    max-width: 600px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
    font-weight: 500;
}

.contact-link:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-alt);
    transform: translateX(4px);
}

.contact-link svg {
    flex-shrink: 0;
}

/* =========================
   Footer
   ========================= */
.footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.footer-text {
    margin-bottom: var(--spacing-md);
}

.footer-attribution {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.claude-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 6px;
    transition: var(--transition);
}

.claude-link:hover {
    background-color: var(--color-bg-alt);
    transform: translateY(-1px);
}

.claude-logo {
    flex-shrink: 0;
}

/* =========================
   Responsive Design
   ========================= */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .hero {
        padding: var(--spacing-lg) 0;
    }

    .name {
        font-size: 2rem;
    }

    .title {
        font-size: 1.125rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.375rem;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

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

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

    .contact-links {
        grid-template-columns: 1fr;
    }

    .modal-overlay {
        padding: var(--spacing-sm);
        align-items: flex-start;
    }

    .modal-content {
        padding: var(--spacing-lg);
        margin-top: var(--spacing-lg);
        max-height: calc(100vh - var(--spacing-xl));
    }

    .modal-header h2 {
        font-size: 1.375rem;
    }

    .modal-header p {
        font-size: 0.9375rem;
    }

    .modal-contact-item {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .modal-icon {
        width: 40px;
        height: 40px;
    }

    .modal-icon svg {
        width: 20px;
        height: 20px;
    }

    .modal-contact-label {
        font-size: 0.8125rem;
    }

    .modal-contact-value {
        font-size: 0.875rem;
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .modal-close {
        position: sticky;
        top: var(--spacing-sm);
    }
}

@media (max-width: 380px) {
    .modal-contact-value {
        font-size: 0.8125rem;
    }

    .modal-header h2 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .name {
        font-size: 1.75rem;
    }

    .title {
        font-size: 1rem;
    }

    .tagline {
        font-size: 0.9375rem;
    }

    .tagline-bold {
        font-size: 1.0625rem;
    }

    .sub-tabs-nav {
        flex-direction: column;
        gap: 0;
        border-bottom: none;
    }

    .sub-tab-button {
        font-size: 0.9375rem;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        text-align: left;
        width: 100%;
        margin-bottom: 0;
    }

    .sub-tab-button.active {
        background-color: var(--color-bg-alt);
        border-bottom-color: var(--color-border);
    }

    .principle-item {
        gap: var(--spacing-sm);
    }

    .principle-icon {
        width: 20px;
        height: 20px;
    }

    .modal-content {
        width: 95%;
        padding: var(--spacing-lg);
        max-height: 85vh;
    }

    .modal-close {
        position: absolute;
        top: var(--spacing-md);
        right: var(--spacing-md);
        left: auto;
        width: 40px;
        height: 40px;
        background-color: var(--color-bg);
        border: 2px solid var(--color-border);
        border-radius: 50%;
    }

    .modal-header {
        margin-bottom: var(--spacing-lg);
        padding-bottom: 0;
    }

    .modal-header h2 {
        font-size: 1.5rem;
    }

    .modal-header p {
        font-size: 1rem;
    }

    .modal-body {
        gap: var(--spacing-sm);
    }

    .modal-body > p:first-child {
        font-size: 1rem;
    }

    .modal-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        margin: var(--spacing-md) 0;
    }

    .modal-card {
        padding: var(--spacing-lg);
    }

    .modal-card h4 {
        font-size: 1.125rem;
    }

    .modal-section {
        margin: var(--spacing-lg) 0;
    }

    .modal-section h3 {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-sm);
    }

    .modal-section p {
        font-size: 1rem;
    }

    .modal-badge {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.875rem;
    }

    .modal-list li {
        font-size: 1rem;
        padding-left: var(--spacing-lg);
    }

    .modal-closing {
        margin-top: var(--spacing-lg);
        padding-top: var(--spacing-md);
        font-size: 1rem;
    }

    .framework-cards {
        grid-template-columns: 1fr;
    }

    /* Contact Modal Mobile Adjustments */
    #contactModal .modal-content {
        width: 95%;
        padding: var(--spacing-md);
        max-height: 90vh;
        overflow-y: auto;
    }

    #contactModal .modal-header {
        margin-bottom: var(--spacing-md);
    }

    #contactModal .modal-header h2 {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }

    #contactModal .modal-header p {
        font-size: 0.875rem;
    }

    #contactModal .modal-body {
        gap: var(--spacing-xs);
    }

    #contactModal .modal-contact-item {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-sm);
        min-height: auto;
    }

    #contactModal .modal-icon {
        width: 36px;
        height: 36px;
        flex-shrink: 0;
    }

    #contactModal .modal-icon svg {
        width: 20px;
        height: 20px;
    }

    #contactModal .modal-contact-details {
        gap: 0.125rem;
    }

    #contactModal .modal-contact-label {
        font-size: 0.8125rem;
        line-height: 1.2;
    }

    #contactModal .modal-contact-value {
        font-size: 0.875rem;
        line-height: 1.3;
    }

    /* Life Tab Mobile */
    .personal-img {
        border-radius: 8px;
        aspect-ratio: 3 / 2;
    }

    .narrative-content p {
        font-size: 1rem;
        line-height: 1.7;
        margin-bottom: var(--spacing-md);
    }

    .books-section .section-title {
        font-size: 1.25rem;
        text-align: left;
    }

    .book-card {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }

    .book-icon {
        font-size: 1.75rem;
    }

    .book-title {
        font-size: 1.125rem;
    }

    .book-author {
        font-size: 0.9375rem;
    }

    .book-note {
        font-size: 0.9375rem;
    }
}

/* =========================
   Main Tabs Navigation
   ========================= */
.main-tabs {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.main-tabs-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.main-tab-button {
    background: none;
    border: none;
    padding: var(--spacing-md) var(--spacing-sm);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-light);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    min-height: 44px;
}

.main-tab-button:hover {
    color: var(--color-text);
}

.main-tab-button.active {
    color: var(--color-primary);
}

.main-tab-button.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--color-primary);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* =========================
   Section Styles
   ========================= */
.section-content {
    max-width: 800px;
}

.section-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.section-alt {
    background-color: var(--color-bg-alt);
    margin-left: calc(-50vw + 50%);
    margin-right: calc(-50vw + 50%);
    padding: var(--spacing-2xl) calc(50vw - 50%);
}

/* Inline Links */
.inline-link {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.inline-link:hover {
    border-bottom-color: var(--color-primary);
}

.section-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.section-link:hover {
    color: var(--color-primary-hover);
}

/* =========================
   Sub-tabs (Curiosity Section)
   ========================= */
.sub-tabs {
    margin-top: var(--spacing-lg);
}

.sub-tabs-nav {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.sub-tab-button {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: 'Inter', sans-serif;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}

.sub-tab-button:hover {
    color: var(--color-text);
}

.sub-tab-button.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.sub-tabs-content {
    min-height: 120px;
}

.sub-tab-content {
    display: none;
}

.sub-tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

/* =========================
   Work Principles List
   ========================= */
.work-principles {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
}

.principle-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.principle-icon {
    flex-shrink: 0;
    color: var(--color-primary);
    margin-top: 2px;
}

.principle-item span {
    line-height: 1.6;
}

.closing-statement {
    margin-top: var(--spacing-lg);
    font-weight: 500;
    color: var(--color-text);
}

/* =========================
   Connect Section
   ========================= */
.connect-content {
    text-align: center;
}

.connect-content p {
    margin-bottom: var(--spacing-lg);
}

.connect-content .btn {
    margin: 0 auto;
}

/* =========================
   Life Tab Styles
   ========================= */

/* Personal Narrative Section */
.life-narrative {
    max-width: 900px;
    margin: 0 auto;
}

.personal-photo {
    width: 100%;
    max-width: 900px;
    margin: 0 auto var(--spacing-2xl);
}

.personal-img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    object-position: center 38%;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    display: block;
}

.narrative-content {
    max-width: 700px;
    margin: 0 auto;
}

.narrative-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.narrative-content p:last-child {
    margin-bottom: 0;
}

/* Books Section */
.books-section {
    margin-top: var(--spacing-2xl);
}

.books-section .section-title {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
}

.books-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.book-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.book-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.1);
    transform: translateY(-2px);
}

.book-icon {
    font-size: 2rem;
    flex-shrink: 0;
    line-height: 1;
}

.book-content {
    flex: 1;
}

.book-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.book-author {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.book-note {
    font-size: 1rem;
    font-style: italic;
    color: var(--color-text-light);
    line-height: 1.6;
    margin: 0;
}

/* =========================
   Print Styles
   ========================= */
@media print {
    body {
        background: white;
    }

    .btn {
        display: none;
    }

    .project-card,
    .tool-item {
        break-inside: avoid;
        box-shadow: none;
    }
}