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

/* Hide scrollbar but keep scroll functionality */
html {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

html::-webkit-scrollbar {
    display: none;
}

body {
    scrollbar-width: none;
    -ms-overflow-style: none;
    overflow: hidden;
}

body::-webkit-scrollbar {
    display: none;
}

/* ============================================
   Theme Variables
   ============================================ */
:root {
    /* Default theme - warm light */
    --bg: #faf9f7;
    --text: #1a1a1a;
    --text-muted: #666;
    --accent: #1a1a1a;
    --border: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Söhne', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;
    
    /* Sizing */
    --content-width: 680px;
    --spacing-unit: 8px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-medium: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --bg: #0d0d0d;
    --text: #e8e8e8;
    --text-muted: #888;
    --accent: #e8e8e8;
    --border: rgba(255, 255, 255, 0.1);
}

/* Terminal theme */
[data-theme="terminal"] {
    --bg: #0a0a0a;
    --text: #00ff41;
    --text-muted: #00aa2a;
    --accent: #00ff41;
    --border: rgba(0, 255, 65, 0.2);
    --font-primary: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;
}

/* Paper theme */
[data-theme="paper"] {
    --bg: #f4f1ea;
    --text: #2c2c2c;
    --text-muted: #666;
    --accent: #8b4513;
    --border: rgba(0, 0, 0, 0.08);
    --font-primary: 'Crimson Pro', 'Georgia', serif;
}

/* Ocean theme */
[data-theme="ocean"] {
    --bg: #0f1419;
    --text: #e6e6e6;
    --text-muted: #7a8c9e;
    --accent: #61afef;
    --border: rgba(97, 175, 239, 0.15);
}

/* Sunset theme */
[data-theme="sunset"] {
    --bg: #1a1520;
    --text: #f0e6d3;
    --text-muted: #a89984;
    --accent: #ff6b6b;
    --border: rgba(255, 107, 107, 0.15);
}

/* ============================================
   Layout
   ============================================ */
body {
    font-family: var(--font-primary);
    font-size: 18px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    transition: background var(--transition-medium), color var(--transition-medium);
}

.page-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 6);
    padding-left: calc(var(--spacing-unit) * 10);
    max-width: var(--content-width);
    position: relative;
    overflow: hidden;
}

@media (max-width: 768px) {
    .content {
        padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 4);
        justify-content: flex-start;
        padding-top: calc(var(--spacing-unit) * 16);
    }
}

/* ============================================
   Views & Navigation System
   ============================================ */
.view {
    position: absolute;
    top: 50%;
    left: calc(var(--spacing-unit) * 10);
    right: calc(var(--spacing-unit) * 6);
    transform: translateY(-50%);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.view.active {
    opacity: 1;
    pointer-events: auto;
}

.view.exiting {
    opacity: 0;
    transform: translateY(-50%) translateY(-30px);
}

.view.entering {
    opacity: 0;
    transform: translateY(-50%) translateY(30px);
}

@media (max-width: 768px) {
    .view {
        left: calc(var(--spacing-unit) * 4);
        right: calc(var(--spacing-unit) * 4);
        top: calc(var(--spacing-unit) * 16);
        transform: translateY(0);
    }
    
    .view.exiting {
        transform: translateY(-30px);
    }
    
    .view.entering {
        transform: translateY(30px);
    }
}

/* ============================================
   Typography
   ============================================ */
.name {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 400;
    letter-spacing: -0.5px;
    margin-bottom: calc(var(--spacing-unit) * 6);
    line-height: 1.2;
}

.section-title {
    font-size: clamp(24px, 4vw, 36px);
    font-weight: 400;
    letter-spacing: -0.5px;
    margin-bottom: calc(var(--spacing-unit) * 4);
    line-height: 1.2;
}

.section-content {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.section-content p {
    color: var(--text-muted);
    margin-bottom: calc(var(--spacing-unit) * 1);
    transition: color var(--transition-medium);
}

.section-content p.spacer {
    height: calc(var(--spacing-unit) * 2);
    margin-bottom: 0;
}

/* ============================================
   Menu Items
   ============================================ */
.menu {
    list-style: none;
}

.menu li {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.menu-item {
    display: inline-block;
    font-family: inherit;
    font-size: inherit;
    color: var(--text);
    background: none;
    border: none;
    padding: calc(var(--spacing-unit) * 0.5) 0;
    cursor: pointer;
    position: relative;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    text-decoration: none;
    line-height: 1.4;
}

.menu-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition-medium);
}

.menu-item:hover::before {
    width: 100%;
}

.menu-item:hover {
    opacity: 0.7;
}

.menu-item.fading {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.menu-item.selected {
    opacity: 1;
    transform: none;
}

.sub-menu {
    margin-top: calc(var(--spacing-unit) * 2);
}

/* Content links */
.content-link {
    color: var(--accent);
    text-decoration: none;
    position: relative;
    transition: opacity var(--transition-fast);
}

.content-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-medium);
}

.content-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.content-link:hover {
    opacity: 0.8;
}

/* External link indicator */
.menu-item.external::after {
    content: ' ↗';
    opacity: 0.5;
}

/* ============================================
   Breadcrumb Navigation
   ============================================ */
.breadcrumb {
    position: fixed;
    top: calc(var(--spacing-unit) * 4);
    left: calc(var(--spacing-unit) * 10);
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
    pointer-events: none;
    z-index: 100;
}

.breadcrumb.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.breadcrumb-home {
    font-family: inherit;
    font-size: 18px;
    color: var(--text);
    background: none;
    border: none;
    cursor: pointer;
    padding: calc(var(--spacing-unit) * 1);
    margin-left: calc(var(--spacing-unit) * -1);
    transition: opacity var(--transition-fast);
}

.breadcrumb-home:hover {
    opacity: 0.6;
}

.breadcrumb-path {
    font-size: 14px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

@media (max-width: 768px) {
    .breadcrumb {
        left: calc(var(--spacing-unit) * 4);
    }
}


/* ============================================
   Footer
   ============================================ */
.footer {
    position: fixed;
    bottom: calc(var(--spacing-unit) * 4);
    left: calc(var(--spacing-unit) * 10);
    font-size: 14px;
    color: var(--text-muted);
    transition: color var(--transition-medium);
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 0.5);
}

.footer-link {
    font-family: inherit;
    font-size: 14px;
    color: var(--text-muted);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-align: left;
    transition: opacity var(--transition-fast);
}

.footer-link:hover {
    opacity: 0.6;
}

@media (max-width: 768px) {
    .footer {
        left: calc(var(--spacing-unit) * 4);
    }
}

/* ============================================
   Style Menu (Theme Selection)
   ============================================ */
.style-menu .style-option {
    /* Neutral colors that work on any background */
    color: #888;
    transition: color var(--transition-fast);
}

.style-menu .style-option:hover {
    color: #666;
}

.style-menu .style-option.active {
    color: #333;
    font-weight: 500;
}

/* Dark themes need lighter neutral colors */
[data-theme="dark"] .style-menu .style-option,
[data-theme="terminal"] .style-menu .style-option,
[data-theme="ocean"] .style-menu .style-option,
[data-theme="sunset"] .style-menu .style-option {
    color: #999;
}

[data-theme="dark"] .style-menu .style-option:hover,
[data-theme="terminal"] .style-menu .style-option:hover,
[data-theme="ocean"] .style-menu .style-option:hover,
[data-theme="sunset"] .style-menu .style-option:hover {
    color: #bbb;
}

[data-theme="dark"] .style-menu .style-option.active,
[data-theme="terminal"] .style-menu .style-option.active,
[data-theme="ocean"] .style-menu .style-option.active,
[data-theme="sunset"] .style-menu .style-option.active {
    color: #fff;
}

/* ============================================
   Terminal Theme Special Effects
   ============================================ */
[data-theme="terminal"] body {
    text-transform: uppercase;
}

[data-theme="terminal"] .menu-item::before {
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent);
}

[data-theme="terminal"] .name,
[data-theme="terminal"] .section-title {
    text-shadow: 0 0 20px var(--accent);
}

[data-theme="terminal"] .content-link {
    text-shadow: 0 0 10px var(--accent);
}

/* Scanline effect for terminal */
[data-theme="terminal"] .page-container::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 255, 65, 0.03) 2px,
        rgba(0, 255, 65, 0.03) 4px
    );
    pointer-events: none;
    z-index: 9999;
}

/* ============================================
   Custom Scroll Behavior
   ============================================ */
.content {
    /* Allow internal scrolling with custom behavior */
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.content::-webkit-scrollbar {
    display: none;
}

/* Smooth content movement on scroll */
.section-content {
    transition: transform var(--transition-fast);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

/* Staggered menu item animations */
.view.active .menu li {
    animation: fadeIn var(--transition-slow) forwards;
    opacity: 0;
}

.view.active .menu li:nth-child(1) { animation-delay: 0ms; }
.view.active .menu li:nth-child(2) { animation-delay: 50ms; }
.view.active .menu li:nth-child(3) { animation-delay: 100ms; }
.view.active .menu li:nth-child(4) { animation-delay: 150ms; }
.view.active .menu li:nth-child(5) { animation-delay: 200ms; }
.view.active .menu li:nth-child(6) { animation-delay: 250ms; }
.view.active .menu li:nth-child(7) { animation-delay: 300ms; }
.view.active .menu li:nth-child(8) { animation-delay: 350ms; }

/* Content paragraph animations */
.view.active .section-content p {
    animation: fadeIn var(--transition-slow) forwards;
    opacity: 0;
}

.view.active .section-content p:nth-child(1) { animation-delay: 0ms; }
.view.active .section-content p:nth-child(2) { animation-delay: 50ms; }
.view.active .section-content p:nth-child(3) { animation-delay: 100ms; }
.view.active .section-content p:nth-child(4) { animation-delay: 150ms; }
.view.active .section-content p:nth-child(5) { animation-delay: 200ms; }
.view.active .section-content p:nth-child(6) { animation-delay: 250ms; }
.view.active .section-content p:nth-child(7) { animation-delay: 300ms; }
.view.active .section-content p:nth-child(8) { animation-delay: 350ms; }

.view.active .section-content a {
    animation: fadeIn var(--transition-slow) forwards;
    animation-delay: 400ms;
    opacity: 0;
}

/* ============================================
   Selection Styling
   ============================================ */
::selection {
    background: var(--accent);
    color: var(--bg);
}

::-moz-selection {
    background: var(--accent);
    color: var(--bg);
}

/* ============================================
   Focus States
   ============================================ */
.menu-item:focus,
.breadcrumb-home:focus,
.theme-toggle:focus,
.theme-option:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .breadcrumb,
    .theme-toggle,
    .theme-menu,
    .footer {
        display: none;
    }
    
    .view {
        position: static;
        opacity: 1;
        transform: none;
    }
}