/* Impossible Stairs - Escher-style impossible geometry
   Showcases: 3D transforms, perspective, isometric illusions, animations */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --stone-light: #d4cfc7;
    --stone-mid: #a39e94;
    --stone-dark: #6b675f;
    --stone-shadow: #4a4740;
    --bg-dark: #1a1a1f;
    --bg-gradient: #2a2a32;
    --accent: #8b7355;
    --text-light: #e8e4dc;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-gradient) 100%);
    color: var(--text-light);
    line-height: 1.8;
    overflow-x: hidden;
}

.scene {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

/* Escher structure container */
.escher-structure {
    position: relative;
    width: min(90vw, 500px);
    height: min(70vw, 400px);
    margin: 2rem 0;
    transform-style: preserve-3d;
    perspective: 1000px;
}

/* Individual steps with 3D effect */
.step {
    position: absolute;
    width: 60px;
    height: 20px;
    transform-style: preserve-3d;
}

.step::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--stone-light);
    transform: rotateX(-30deg) skewX(-30deg);
    box-shadow: inset -2px -2px 4px var(--stone-mid);
}

.step::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 100%;
    right: -18px;
    background: var(--stone-dark);
    transform: skewY(-60deg);
    transform-origin: top left;
}

/* Position steps in ascending/descending pattern */
.step-1 { left: 30%; bottom: 60%; }
.step-2 { left: 35%; bottom: 63%; }
.step-3 { left: 40%; bottom: 66%; }
.step-4 { left: 45%; bottom: 69%; }
.step-5 { left: 50%; bottom: 66%; }
.step-6 { left: 55%; bottom: 63%; }
.step-7 { left: 60%; bottom: 60%; }
.step-8 { left: 55%; bottom: 57%; }
.step-9 { left: 50%; bottom: 54%; }
.step-10 { left: 45%; bottom: 51%; }
.step-11 { left: 40%; bottom: 54%; }
.step-12 { left: 35%; bottom: 57%; }

/* Pillars */
.pillar {
    position: absolute;
    width: 25px;
    background: linear-gradient(90deg, var(--stone-dark) 0%, var(--stone-mid) 50%, var(--stone-dark) 100%);
    box-shadow:
        inset 2px 0 4px rgba(255,255,255,0.1),
        inset -2px 0 4px rgba(0,0,0,0.3);
}

.pillar-1 {
    left: 20%;
    bottom: 20%;
    height: 50%;
}

.pillar-2 {
    right: 20%;
    bottom: 20%;
    height: 45%;
}

.pillar-3 {
    left: 35%;
    bottom: 15%;
    height: 35%;
}

.pillar-4 {
    right: 35%;
    bottom: 15%;
    height: 40%;
}

/* Platforms */
.platform {
    position: absolute;
    background: var(--stone-mid);
    transform: skewX(-30deg);
    box-shadow:
        5px 5px 0 var(--stone-dark),
        inset 0 2px 4px rgba(255,255,255,0.2);
}

.platform-top {
    top: 15%;
    left: 25%;
    width: 50%;
    height: 15px;
}

.platform-left {
    top: 35%;
    left: 15%;
    width: 25%;
    height: 12px;
    transform: skewX(-30deg) rotate(-10deg);
}

.platform-right {
    top: 35%;
    right: 15%;
    width: 25%;
    height: 12px;
    transform: skewX(-30deg) rotate(10deg);
}

.platform-bottom {
    bottom: 15%;
    left: 20%;
    width: 60%;
    height: 18px;
}

/* Walking figures */
.walker {
    position: absolute;
    width: 12px;
    height: 24px;
    background: var(--stone-shadow);
    border-radius: 6px 6px 0 0;
    animation: walk 8s linear infinite;
}

.walker::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 1px;
    width: 10px;
    height: 10px;
    background: var(--stone-shadow);
    border-radius: 50%;
}

.walker-1 {
    animation-delay: 0s;
}

.walker-2 {
    animation-delay: -2.6s;
}

.walker-3 {
    animation-delay: -5.3s;
}

@keyframes walk {
    0% { left: 32%; bottom: 62%; }
    8% { left: 37%; bottom: 65%; }
    16% { left: 42%; bottom: 68%; }
    24% { left: 47%; bottom: 71%; }
    32% { left: 52%; bottom: 68%; }
    40% { left: 57%; bottom: 65%; }
    48% { left: 62%; bottom: 62%; }
    56% { left: 57%; bottom: 59%; }
    64% { left: 52%; bottom: 56%; }
    72% { left: 47%; bottom: 53%; }
    80% { left: 42%; bottom: 56%; }
    88% { left: 37%; bottom: 59%; }
    100% { left: 32%; bottom: 62%; }
}

/* Content */
.content {
    max-width: 600px;
    text-align: center;
    padding: 2rem;
}

.header {
    margin-bottom: 2rem;
}

h1 {
    font-size: clamp(1.8rem, 6vw, 3rem);
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--stone-light);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    font-style: italic;
    color: var(--stone-mid);
    letter-spacing: 0.1em;
}

.text {
    margin-bottom: 2rem;
}

.quote {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    font-style: italic;
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-left: 3px solid var(--accent);
    background: rgba(139, 115, 85, 0.1);
    text-align: left;
}

.text p {
    margin-bottom: 1rem;
    font-size: clamp(0.9rem, 2vw, 1rem);
    text-align: justify;
}

.footer {
    font-size: 0.85rem;
    color: var(--stone-mid);
    font-style: italic;
}

/* Responsive */
@media (max-width: 600px) {
    .escher-structure {
        transform: scale(0.8);
    }

    .content {
        padding: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .walker {
        animation: none;
        left: 45%;
        bottom: 65%;
    }

    .walker-2 {
        left: 55%;
        bottom: 62%;
    }

    .walker-3 {
        left: 40%;
        bottom: 58%;
    }
}