/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #fafafa;
    --color-text: #1a1a2e;
    --color-text-light: #5a5a6e;
    --color-accent: #3a3a5c;
    --color-accent-hover: #187DB1;
    --color-border: #e8e8ee;
    --color-card-bg: #ffffff;
    --color-tag-bg: #f0f0f5;
    --color-tag-text: #187DB1;
    --font-main: 'Fira Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 32px;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.25s ease;
}

a:hover {
    color: var(--color-accent-hover);
}

img {
    max-width: 100%;
    height: auto;
}

/* Fade-in Animation */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Top Navigation */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.top-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.nav-brand:hover {
    color: var(--color-accent-hover);
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-left: 32px;
    position: relative;
    padding-bottom: 2px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-hover);
    transition: width 0.25s ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Active nav link */
.nav-links a.active {
    color: var(--color-text);
}

.nav-links a.active::after {
    width: 100%;
}

/* Page Header (subpages) */
.page-header {
    padding: 80px 0 40px;
    text-align: center;
}

.page-header h1 {
    font-family: var(--font-main);
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.page-subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--color-text-light);
}

/* View All links */
.view-all {
    display: inline-block;
    margin-top: 32px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent-hover);
    letter-spacing: 0.02em;
    transition: letter-spacing 0.25s ease;
}

.view-all:hover {
    letter-spacing: 0.06em;
    color: var(--color-accent-hover);
}

/* Subpage sections — no top border on first section */
.page-books,
.page-posts {
    padding-top: 48px;
    border-top: none;
}

/* Hero */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 20% 50%, rgba(108, 99, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 0%, rgba(99, 179, 255, 0.06) 0%, transparent 50%);
    animation: heroShift 12s ease-in-out infinite alternate;
    z-index: 0;
    pointer-events: none;
}

@keyframes heroShift {
    0% { transform: translate(0%, 0%) rotate(0deg); }
    33% { transform: translate(2%, -3%) rotate(1deg); }
    66% { transform: translate(-2%, 2%) rotate(-1deg); }
    100% { transform: translate(1%, -1%) rotate(0.5deg); }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-family: var(--font-main);
    font-size: 3.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    line-height: 1.1;
}

.typed-tagline {
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--color-text-light);
    margin-bottom: 32px;
    min-height: 2em;
}

.cursor {
    display: inline-block;
    font-weight: 300;
    animation: blink 0.8s step-end infinite;
    color: var(--color-accent-hover);
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero .bio {
    font-size: 1.05rem;
    font-weight: 400;
    max-width: 560px;
    margin: 0 auto;
    color: var(--color-text-light);
    line-height: 1.8;
}

.hero .bio a {
    font-weight: 500;
    color: var(--color-accent-hover);
    border-bottom: 1px solid transparent;
    transition: border-color 0.25s ease, color 0.25s ease;
}

.hero .bio a:hover {
    border-bottom-color: var(--color-accent-hover);
}

/* Section Titles */
.section-title {
    font-family: var(--font-main);
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 48px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--color-accent-hover);
    border-radius: 2px;
}

/* Posts Section */
.posts {
    padding: 96px 0;
}

.posts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
}

.post-card {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 0;
    align-items: stretch;
    background: var(--color-card-bg);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.post-image {
    height: 100%;
    min-height: 260px;
    overflow: hidden;
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.post-card:hover .post-image img {
    transform: scale(1.04);
}

.post-content {
    padding: 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.post-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
    width: fit-content;
}

.post-content h3 {
    font-family: var(--font-main);
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.post-content p {
    color: var(--color-text-light);
    font-size: 0.92rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent-hover);
    letter-spacing: 0.02em;
    transition: letter-spacing 0.25s ease;
}

.read-more:hover {
    letter-spacing: 0.06em;
    color: var(--color-accent-hover);
}

/* Books Section */
.books {
    padding: 96px 0;
    border-top: 1px solid var(--color-border);
}

.book-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.book-filters {
    display: flex;
    gap: 8px;
}

.book-actions {
    display: flex;
    gap: 8px;
}

.edit-books-btn {
    font-family: var(--font-main);
    font-size: 0.82rem;
    font-weight: 500;
    padding: 8px 20px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all 0.25s ease;
}

.edit-books-btn:hover {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

#add-book-btn {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

#add-book-btn:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

.books-edit-mode #edit-books-btn {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

/* Add Book Modal */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.modal-backdrop.open {
    display: flex;
}

.modal {
    background: #fff;
    border-radius: 16px;
    padding: 36px;
    width: 90%;
    max-width: 440px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.modal h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.modal label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 16px;
}

.modal input[type="text"],
.modal input[type="url"] {
    display: block;
    width: 100%;
    margin-top: 6px;
    padding: 10px 14px;
    font-family: var(--font-main);
    font-size: 0.92rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.modal input[type="text"]:focus,
.modal input[type="url"]:focus {
    border-color: var(--color-accent-hover);
}

.modal-toggles {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
}

.toggle-label {
    display: flex !important;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem !important;
    cursor: pointer;
}

.toggle-label input[type="checkbox"] {
    accent-color: var(--color-accent-hover);
    width: 16px;
    height: 16px;
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-cancel,
.modal-submit {
    font-family: var(--font-main);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 24px;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.2s;
}

.modal-cancel {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-light);
}

.modal-cancel:hover {
    border-color: var(--color-text-light);
}

.modal-submit {
    background: var(--color-accent-hover);
    border: 1px solid var(--color-accent-hover);
    color: #fff;
}

.modal-submit:hover {
    opacity: 0.9;
}

.save-status {
    font-size: 0.82rem;
    font-weight: 600;
    color: #2ec486;
    margin-left: 8px;
}

.login-error {
    font-size: 0.82rem;
    color: #e53e3e;
    margin-bottom: 16px;
}

.book-filter {
    font-family: var(--font-main);
    font-size: 0.82rem;
    font-weight: 500;
    padding: 8px 20px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all 0.25s ease;
}

.book-filter:hover {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

.book-filter.active {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 28px;
}

.book-card {
    transition: transform 0.3s ease;
}

.book-card:hover {
    transform: translateY(-4px);
}

.book-card img {
    width: 100%;
    aspect-ratio: 2 / 3;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease;
}

.book-card:hover img {
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.15);
}

.book-info {
    padding: 12px 2px 0;
}

.book-info h4 {
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 2px;
}

.book-author {
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-bottom: 6px;
}

.book-badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    border-radius: 20px;
    margin-right: 4px;
}

.book-badge.recommended {
    background: rgba(108, 99, 255, 0.1);
    color: var(--color-accent-hover);
}

.book-badge.reading {
    background: rgba(46, 196, 134, 0.1);
    color: #2ec486;
}

.book-cover-wrap {
    position: relative;
}

.book-edit-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.edit-toggle {
    font-family: var(--font-main);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 6px 16px;
    border: 1.5px solid rgba(255, 255, 255, 0.5);
    border-radius: 100px;
    background: transparent;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 110px;
}

.edit-toggle:hover {
    border-color: #fff;
    color: #fff;
}

.edit-toggle.active {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

.delete-toggle {
    border-color: #e53e3e !important;
    color: #e53e3e !important;
}

.delete-toggle:hover {
    background: #e53e3e !important;
    color: #fff !important;
}

.books-edit-mode .book-card {
    cursor: default;
}

.books-edit-mode .book-card:hover {
    transform: none;
}

/* Investments Page */
.highlights {
    padding: 0 0 48px;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.investments .highlights-grid {
    margin-top: 32px;
}

.highlight-card {
    display: flex;
    flex-direction: column;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.highlight-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.highlight-logo {
    height: 40px;
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.highlight-logo img {
    max-height: 36px;
    max-width: 120px;
    object-fit: contain;
}

.highlight-logo .company-text-logo {
    font-size: 1.1rem;
}

.highlight-info h3 {
    display: none;
}

.highlight-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: rgba(46, 196, 134, 0.1);
    color: #2ec486;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 6px;
}

.highlight-info p {
    font-size: 0.8rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

.portfolio {
    padding: 0 0 96px;
}

.portfolio-controls {
    margin-bottom: 40px;
}

.portfolio-filters {
    display: flex;
    gap: 8px;
}

.portfolio-filter {
    font-family: var(--font-main);
    font-size: 0.82rem;
    font-weight: 500;
    padding: 8px 20px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all 0.25s ease;
}

.portfolio-filter:hover {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
}

.portfolio-filter.active {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.company-card {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 28px 16px;
    aspect-ratio: 1;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.company-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.company-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.company-logo img {
    max-width: 80%;
    max-height: 48px;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.company-card:hover .company-logo img {
    filter: grayscale(0%);
    opacity: 1;
}

.company-text-logo {
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.company-card:hover .company-text-logo {
    opacity: 1;
    color: var(--color-accent-hover);
}

.company-tooltip {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: #fff;
    padding: 14px 18px;
    border-radius: 10px;
    width: 240px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    pointer-events: none;
    z-index: 50;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.company-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-text);
}

.company-card:hover .company-tooltip {
    opacity: 1;
    visibility: visible;
}

.company-tooltip strong {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.company-tooltip p {
    font-size: 0.75rem;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.8);
}

/* About Page */
.about-page {
    padding: 80px 0 96px;
}

.about-hero {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 64px;
}

.about-photo img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.about-intro h1 {
    font-family: var(--font-main);
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.about-lead {
    font-size: 1.1rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

.about-body {
    max-width: 700px;
}

.about-section {
    margin-bottom: 48px;
}

.about-section p {
    color: var(--color-text-light);
    font-size: 1.02rem;
    line-height: 1.85;
    margin-bottom: 16px;
}

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

/* About & Investments */
.about,
.investments {
    padding: 80px 0;
    border-top: 1px solid var(--color-border);
}

.about p,
.investments p {
    color: var(--color-text-light);
    font-size: 1.05rem;
    max-width: 640px;
    line-height: 1.85;
}

/* Footer */
footer {
    background: var(--color-text);
    color: #fff;
    padding: 72px 0 48px;
    text-align: center;
}

footer h2 {
    font-family: var(--font-main);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 28px;
    color: #fff;
    letter-spacing: -0.01em;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
}

.social-links a {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 24px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 100px;
    transition: all 0.25s ease;
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
}

.copyright {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.35);
    font-weight: 300;
}

/* Responsive */
@media (max-width: 700px) {
    .hero {
        padding: 72px 0 56px;
    }

    .hero h1 {
        font-size: 2.6rem;
    }

    .typed-tagline {
        font-size: 1.1rem;
    }

    .nav-links a {
        margin-left: 20px;
        font-size: 0.8rem;
    }

    .post-card {
        grid-template-columns: 1fr;
    }

    .post-image {
        min-height: 200px;
        height: 200px;
    }

    .post-content {
        padding: 24px;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .social-links {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }

    .social-links a {
        width: 200px;
        text-align: center;
    }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 20px;
    }

    .book-filters,
    .portfolio-filters {
        flex-wrap: wrap;
    }

    .about-hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-photo img {
        max-width: 220px;
        margin: 0 auto;
    }

    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 12px;
    }

    .company-card {
        padding: 20px 12px;
    }

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

    .company-tooltip {
        display: none;
    }
}