/* ===== CSS VARIABLES ===== */
:root {
    /* Light theme colors */
    --bg-primary: #f4f4f4;
    --bg-secondary: #e5e5e5;
    --text-primary: #2a2a2a;
    --text-secondary: #444;
    --text-tertiary: #555;
    --text-muted: #777;
    --border-color: #2a2a2a;
    --accent: #2a2a2a;
    --shadow-color: rgba(42, 42, 42, 0.3);

    /* Layout & Spacing */
    --max-width: 800px;
    --spacing-xs: 10px;
    --spacing-sm: 15px;
    --spacing-md: 20px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;

    /* Visual effects */
    --radius: 0px;
    --transition-speed: 0.5s;
    --transition: var(--transition-speed) ease;
    --border-width: 2px;
    --shadow-offset: 5px;

    /* Typography */
    --font-family: "Space Mono", monospace;
    --font-size-base: 18px;
    --font-size-sm: 0.85rem;
    --font-size-md: 0.9rem;
    --font-size-lg: 1rem;
    --line-height: 1.6;
}

/* Dark theme colors */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #f4f4f4;
    --text-secondary: #e5e5e5;
    --text-tertiary: #d0d0d0;
    --text-muted: #999;
    --border-color: #f4f4f4;
    --accent: #f4f4f4;
    --shadow-color: rgba(244, 244, 244, 0.3);
}

/* ===== GLOBAL RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== BASE STYLES ===== */
body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: var(--line-height);
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    animation: fadeIn 0.6s ease-in;
    transition:
        background var(--transition),
        color var(--transition);
}

/* Fade in animation on page load */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Main container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xs);
}

/* ===== HEADER ===== */
header {
    text-align: center;
    padding: var(--spacing-md) 0;
    border-bottom: var(--border-width) solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: var(--spacing-xs);
    cursor: default;
    user-select: none;
    transition: transform var(--transition);
}

h1:active {
    transform: scale(0.98);
}

.subtitle {
    font-size: clamp(1.1rem, 2vw, 1.1rem);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    padding: 0;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* ===== THEME TRANSITION ANIMATION ===== */
body.theme-changing {
    transition: background-color var(--transition);
}

/* Animate background, borders and shadows during theme change */
body.theme-changing .info-box,
body.theme-changing .theme-toggle,
body.theme-changing .level-tag {
    transition:
        background-color var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

/* Disable text color transitions during theme change to avoid flickering */
body.theme-changing h1,
body.theme-changing h2,
body.theme-changing h3,
body.theme-changing p,
body.theme-changing span,
body.theme-changing a,
body.theme-changing .value,
body.theme-changing .label,
body.theme-changing .subtitle {
    transition: none;
}

/* ===== SECTIONS ===== */
section {
    margin-bottom: var(--spacing-lg);
    animation: slideIn 0.6s ease-out backwards;
}

/* Slide in animation */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger section animations */
section:nth-child(2) {
    animation-delay: 0.2s;
}

section:nth-child(3) {
    animation-delay: 0.3s;
}

section:nth-child(4) {
    animation-delay: 0.4s;
}

/* ===== TYPOGRAPHY ===== */
h2 {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-xs);
    border-left: 4px solid var(--accent);
    padding-left: var(--spacing-sm);
}

p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-tertiary);
}

address {
    font-style: normal;
}

/* ===== INFO BOX ===== */
.info-box {
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--shadow-color);
    background: var(--bg-secondary);
    border: var(--border-width) solid var(--border-color);
    padding: 25px;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius);
    transition: all var(--transition);
}

/* ===== CONTACT ===== */
.contact-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: var(--spacing-md);
}

.label {
    font-weight: 700;
    font-size: var(--font-size-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.value {
    font-size: var(--font-size-lg);
    color: var(--text-muted);
}

.value a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    transition: opacity var(--transition);
}

/* ===== LEVEL TAGS ===== */
.levels {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.level-tag {
    background: var(--bg-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-md);
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--shadow-color);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius);
    transition: all var(--transition);
    /* Disable iOS Safari tap highlight */
    -webkit-tap-highlight-color: transparent;
}

/* ===== FOOTER ===== */
footer {
    text-align: center;
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-lg);
    border-top: var(--border-width) solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ===== ACCESSIBILITY ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition:
        opacity 0.6s ease-out,
        transform 0.6s ease-out;
}

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

/* ===== MAP LINK ===== */
.map-link {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    transition: opacity var(--transition);
}

.map-link:hover {
    opacity: 0.7;
}

/* ===== EASTER EGG - FALLING PI DIGITS ===== */
.pi-digit {
    position: fixed;
    font-family: var(--font-family);
    font-weight: 700;
    font-size: 2rem;
    color: var(--accent);
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    animation: piFall 3s ease-in forwards;
}

@keyframes piFall {
    0% {
        opacity: 1;
        transform: translateY(0) rotate(0deg);
    }

    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(360deg);
    }
}

/* ===== RESPONSIVE - DESKTOP ===== */
@media (min-width: 768px) {
    body {
        padding: var(--spacing-lg);
    }

    header {
        padding: var(--spacing-xl) 0;
    }

    section {
        margin-bottom: var(--spacing-xl);
    }

    .info-box {
        padding: 35px;
    }

    .contact-item {
        flex-direction: row;
        align-items: baseline;
        gap: var(--spacing-sm);
    }

    .label {
        min-width: 120px;
    }
}