/* ===== CSS Variables ===== */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #0ea5e9;
    --success-color: #10b981;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --background-section: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s ease;
    --container-max: 1200px;
    --container-padding: 24px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

@media (min-width: 2100px) {
    :root {
        --container-max: 1520px;
        --container-padding: 40px;
    }
}

@media (min-width: 2600px) {
    :root {
        --container-max: 1720px;
        --container-padding: 56px;
    }
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--background-alt);
    border-color: var(--text-muted);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a:not(.btn) {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-links a:not(.btn):hover {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    padding: clamp(100px, 15vh, 140px) 0 clamp(60px, 10vh, 80px);
    background: linear-gradient(180deg, var(--background-alt) 0%, var(--background) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 500;
    border-radius: 50px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.hero-description {
    font-size: clamp(16px, 2vw, 18px);
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Hero Visual - MahApps.Metro Vault Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 0;
}

.vault-mockup {
    width: min(100%, 560px);
    aspect-ratio: 1100 / 718;
    background: #ffffff;
    border: 1px solid #1b6fa8;
    border-radius: 0;
    box-shadow: 0 28px 70px rgb(15 23 42 / 0.24);
    color: #000000;
    display: flex;
    flex-direction: column;
    font-family: 'Segoe UI', Arial, sans-serif;
    overflow: hidden;
}

.mockup-titlebar {
    align-items: center;
    background: #3498db;
    color: #ffffff;
    display: flex;
    height: 28px;
    justify-content: space-between;
    padding: 0 10px;
}

.mockup-window-title {
    font-size: 13px;
    line-height: 1;
}

.mockup-window-controls {
    align-items: center;
    display: flex;
    gap: 26px;
    height: 100%;
}

.mockup-window-controls span {
    display: block;
    height: 10px;
    position: relative;
    width: 10px;
}

.mockup-window-controls span::before,
.mockup-window-controls span::after {
    background: currentColor;
    content: '';
    display: block;
    position: absolute;
}

.mockup-window-controls span:first-child::before {
    height: 1px;
    left: 1px;
    top: 7px;
    width: 8px;
}

.mockup-window-controls span:nth-child(2)::before {
    border: 1px solid currentColor;
    background: transparent;
    height: 8px;
    left: 1px;
    top: 1px;
    width: 8px;
}

.mockup-window-controls span:last-child::before,
.mockup-window-controls span:last-child::after {
    height: 1px;
    left: 0;
    top: 5px;
    width: 11px;
}

.mockup-window-controls span:last-child::before { transform: rotate(45deg); }
.mockup-window-controls span:last-child::after { transform: rotate(-45deg); }

.mockup-app-shell {
    display: flex;
    flex: 1;
    flex-direction: column;
    padding: 16px 18px 18px;
}

.mockup-app-header {
    align-items: center;
    display: flex;
    gap: 20px;
    justify-content: space-between;
    margin-bottom: 14px;
}

.mockup-brand-row {
    align-items: baseline;
    display: flex;
    gap: 12px;
    min-width: 0;
}

.mockup-brand-row strong {
    color: #000000;
    font-size: clamp(15px, 2.4vw, 24px);
    font-weight: 600;
    line-height: 1.1;
}

.mockup-brand-row span,
.mockup-details-heading p,
.mockup-panel p {
    color: #000000;
    font-size: clamp(7px, 1vw, 11px);
    line-height: 1.35;
}

.mockup-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.mockup-actions button,
.mockup-search-button {
    background: linear-gradient(#fbfbfb, #f4f4f4);
    border: 1px solid #c9c9c9;
    border-radius: 3px;
    color: #000000;
    font-family: inherit;
    font-size: clamp(7px, 0.9vw, 10px);
    font-weight: 700;
    line-height: 1;
    min-width: clamp(48px, 8vw, 96px);
    padding: 10px 12px;
    text-align: center;
    text-transform: uppercase;
}

.mockup-tabs {
    align-items: center;
    display: flex;
    gap: 10px;
    margin: 0 0 12px 6px;
}

.mockup-tabs span {
    color: #a6a6a6;
    font-size: clamp(16px, 3vw, 27px);
    font-weight: 300;
    line-height: 1;
}

.mockup-tabs .active {
    color: #4f86e8;
}

.mockup-workspace {
    display: grid;
    flex: 1;
    gap: 8px;
    grid-template-columns: minmax(150px, 300px) 1fr;
    min-height: 0;
}

.mockup-panel {
    background: #ffffff;
    border: 1px solid #cfcfcf;
    border-radius: 4px;
}

.mockup-sidebar {
    display: flex;
    flex-direction: column;
    max-width: none;
    min-width: 0;
    overflow: hidden;
    padding: 14px 12px;
    width: auto;
}

.mockup-panel h3 {
    color: #000000;
    font-size: clamp(10px, 1.5vw, 16px);
    font-weight: 600;
    line-height: 1.2;
    margin: 0 0 8px;
}

.mockup-search-row {
    align-items: stretch;
    display: grid;
    gap: 8px;
    grid-template-columns: 1fr minmax(50px, 82px) minmax(50px, 64px);
    margin-bottom: 5px;
}

.mockup-input,
.mockup-select {
    background: #ffffff;
    border: 1px solid #d6d6d6;
    display: block;
    min-height: 25px;
}

.mockup-select {
    color: #000000;
    font-size: clamp(8px, 1vw, 12px);
    line-height: 25px;
    padding-left: 7px;
    position: relative;
}

.mockup-select::after {
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    border-top: 4px solid #333333;
    content: '';
    position: absolute;
    right: 7px;
    top: 11px;
}

.mockup-search-button {
    align-items: center;
    color: #999999;
    display: flex;
    justify-content: center;
    min-width: 0;
    padding: 0 8px;
}

.mockup-tree-placeholder {
    flex: 1;
    min-height: 0;
}

.mockup-details {
    display: block;
    min-width: 0;
    overflow: hidden;
    padding: 18px 16px;
}

.mockup-details-heading {
    align-items: baseline;
    display: flex;
    gap: 12px;
}

.mockup-details-heading h3 {
    font-size: clamp(12px, 1.8vw, 18px);
    margin: 0;
}

@media (max-width: 640px) {
    .vault-mockup {
        width: min(100%, 420px);
    }

    .mockup-app-shell {
        padding: 12px;
    }

    .mockup-workspace {
        gap: 6px;
        grid-template-columns: 34% 1fr;
    }

    .mockup-sidebar,
    .mockup-details {
        padding: 10px;
    }

    .mockup-search-row {
        gap: 4px;
        grid-template-columns: 1fr 42px;
    }

    .mockup-search-button {
        display: none;
    }
}

/* ===== Section Styling ===== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Features Section ===== */
.features {
    padding: 100px 0;
    background: var(--background);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Security Section ===== */
.security {
    padding: 100px 0;
    background: var(--background-section);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 64px;
}

.security-item {
    text-align: center;
    padding: 32px 24px;
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.security-badge {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.security-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.security-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Security Diagram */
.security-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: nowrap;
    gap: 8px;
    padding: 24px;
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.diagram-step {
    display: flex;
    align-items: center;
    gap: 8px;
}

.step-circle {
    flex-shrink: 0;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: #ffffff;
    font-size: 14px;
    font-weight: 700;
    border-radius: 50%;
    padding: 0 8px;
}

.step-text h4 {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 1px;
}

.step-text p {
    font-size: 11px;
    color: var(--text-secondary);
}

.diagram-arrow {
    color: var(--text-muted);
    flex-shrink: 0;
}

@media (min-width: 1200px) {
    .security-diagram {
        gap: 16px;
        padding: 32px;
    }

    .step-number {
        min-width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .step-text h4 {
        font-size: 14px;
    }

    .step-text p {
        font-size: 12px;
    }
}

/* ===== Architecture Section ===== */
.architecture {
    padding: 100px 0;
    background: var(--background);
}

.architecture-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    margin-bottom: 48px;
}

.arch-layer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    width: 100%;
    max-width: 500px;
    padding: 24px 32px;
    border-radius: var(--radius-md);
    text-align: center;
}

.arch-layer.desktop {
    background: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
    color: #ffffff;
}

.arch-layer.application {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: #ffffff;
}

.arch-layer.infrastructure {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
}

.arch-layer.persistence {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #ffffff;
}

.arch-layer.domain {
    background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
    color: #ffffff;
}

.layer-label {
    font-size: 18px;
    font-weight: 600;
}

.layer-description {
    font-size: 14px;
    opacity: 0.9;
}

.arch-connector {
    width: 2px;
    height: 24px;
    background: var(--border-color);
}

/* Tech Stack */
.tech-stack {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px 24px;
    background: var(--background-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.tech-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.tech-role {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== Getting Started Section ===== */
.getting-started {
    padding: 100px 0;
    background: var(--background-section);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.step-card {
    position: relative;
    padding: 40px 32px;
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
}

.step-card .step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    font-size: 18px;
}

.step-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.step-card p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.step-card code, .step-card .code-block {
    display: block;
    padding: 12px 16px;
    background: var(--background-alt);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: clamp(11px, 1.5vw, 13px);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    word-break: break-all;
    line-height: 1.4;
}

/* ===== Download Section ===== */
.download {
    padding: 100px 0;
    background: var(--background);
}

.download-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 24px;
    padding: 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: #ffffff;
    border-radius: var(--radius-xl);
    flex-wrap: wrap;
}

.download-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.download-info p {
    font-size: 15px;
    opacity: 0.9;
}

.download-card .btn-primary {
    background: #ffffff;
    color: var(--primary-color);
}

.download-card .btn-primary:hover {
    background: var(--background-alt);
}

.platform-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    padding: 64px 0 32px;
    background: var(--background-alt);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 16px;
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 16rem;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    font-size: 15px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-secondary);
}

.author-link {
    font-weight: 600;
    transition: var(--transition);
}

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

.heart {
    color: #ef4444;
}

/* ===== GitHub Fork Ribbon Override ===== */
.github-fork-ribbon {
    background-color: var(--primary-color);
}

@media (min-width: 2100px) {
    .hero .container {
        grid-template-columns: minmax(0, 0.9fr) minmax(640px, 1.1fr);
        gap: 88px;
    }

    .vault-mockup {
        width: min(100%, 680px);
    }

    .section-subtitle {
        max-width: 760px;
    }

    .arch-layer {
        max-width: 680px;
    }

    .download-card {
        max-width: 1040px;
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-title {
        font-size: 44px;
    }

    .hero-visual {
        order: -1;
    }

    .section-title {
        font-size: 34px;
    }

    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--background);
        border-bottom: 1px solid var(--border-color);
        padding: 0;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 16px 24px;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-description {
        font-size: 16px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .section-title {
        font-size: 28px;
    }

    .section-subtitle {
        font-size: 16px;
    }

    .security-diagram {
        flex-direction: column;
        gap: 8px;
        padding: 20px;
    }

    .diagram-arrow {
        transform: rotate(90deg);
    }

    .vault-mockup {
        max-width: 100%;
        aspect-ratio: 16/10;
    }

    .mockup-content {
        flex-direction: column;
    }

    .mockup-sidebar {
        width: 100%;
        max-width: 100%;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        overflow-x: auto;
        padding: 8px;
        gap: 4px;
    }

    .tree-branch {
        display: flex;
        gap: 4px;
        flex-shrink: 0;
    }

    .tree-children {
        display: flex;
        gap: 4px;
        margin-left: 8px;
    }

    .mockup-main {
        min-height: 120px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-brand {
        text-align: center;
    }

    .footer-brand p {
        max-width: 100%;
    }

    .footer-links {
        flex-direction: column;
        gap: 32px;
    }

    .footer-column {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 28px;
    }

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

    .tech-stack {
        gap: 12px;
    }

    .tech-item {
        padding: 12px 16px;
    }

    .download-card {
        padding: 24px;
    }

    .download-icon svg {
        width: 36px;
        height: 36px;
    }

    .download-info h3 {
        font-size: 20px;
    }
}

/* ===== Print Styles ===== */
@media print {
    .header, .footer, .hero-visual {
        display: none;
    }

    .hero {
        padding-top: 40px;
    }

    .section-title {
        font-size: 24px;
    }
}