/* 
   qslides Engine CSS - Core presentation mechanics
   Controls: slide transitions, navigation, worldbuilding background, UI controls
   Template-agnostic: works with any template's visual CSS
*/

:root {
    --q-bg: #000000;
    --q-ice: #F8F9FA;
    --q-text: #ffffff;
    --q-slide-px: 0vw;
    --q-slide-py: 5vh;
    
    --q-card-bg: rgba(0, 0, 0, 0.4);
    --q-card-border: rgba(255, 255, 255, 0.1);
    --q-card-text: #ffffff;
    --q-btn-bg: rgba(255, 255, 255, 0.03);
    --q-btn-border: rgba(255, 255, 255, 0.1);
    --q-btn-text: #ffffff;
    --q-world-gradient: radial-gradient(circle at 50% 50%, #0d0d0d 0%, #000 100%);
    --q-ui-text: rgba(255, 255, 255, 0.6);
}

body.light-mode {
    --q-bg: #f8f9fa;
    --q-text: #111111;
    --q-card-bg: rgba(255, 255, 255, 0.92);
    --q-card-border: rgba(0, 0, 0, 0.1);
    --q-card-text: #111111;
    --q-btn-bg: rgba(0, 0, 0, 0.05);
    --q-btn-border: rgba(0, 0, 0, 0.1);
    --q-btn-text: #111111;
    --q-world-gradient: radial-gradient(circle at 50% 50%, #f8f9fa 0%, #ffffff 100%);
    --q-ui-text: rgba(0, 0, 0, 0.6);
}

/* Light Mode: Base typography */
body.light-mode p { color: rgba(17, 17, 17, 0.85); }
body.light-mode h1, body.light-mode h2, body.light-mode h3 { color: #111111; }

body {
    background: var(--q-bg);
    color: var(--q-text);
    overflow: hidden;
    height: 100vh;
    margin: 0;
}

/* --- Worldbuilding Background --- */
.world-bg,
.world-bg::before,
.world-bg::after {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.world-bg {
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--q-world-gradient);
}

.world-bg::before,
.world-bg::after {
    content: '';
    border: 1px solid var(--q-card-border);
    border-radius: 50%;
}

.world-bg::before {
    width: 60vw;
    height: 60vw;
}

.world-bg::after {
    width: 90vw;
    height: 90vw;
    opacity: 0.5;
}

.sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    transition: transform 3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Navigation HUD --- */
.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.05);
    z-index: 1000;
}

#progress-bar {
    height: 100%;
    width: 0%;
    transition: width 0.5s ease;
}

/* --- Slide Logic --- */
.slide {
    display: none;
    height: 100vh;
    overflow: hidden;
    animation: slideEnter 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.slide.active {
    display: flex;
    flex-direction: column;
}

@keyframes slideEnter {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.slide .slide-inner {
    transition: all 0.5s ease;
    filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.1));
}

/* --- Base Typography (engine defaults, overridden by template) --- */
h1, h2, h3, p {
    margin: 0;
    overflow-wrap: break-word;
    hyphens: none;
}

/* --- Slide Inner --- */
.slide-inner {
    padding: var(--q-slide-py) var(--q-slide-px);
}

/* --- Components --- */
.glass-card {
    background: var(--q-card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--q-card-border);
}

.section-image-container {
    width: clamp(200px, 30vw, 400px);
}

.shadow-2xl {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* --- UI Controls --- */
.fullscreen-btn,
.index-btn {
    position: fixed;
    top: 2.5rem;
    z-index: 1100;
}

.fullscreen-btn {
    right: 4rem;
}

.theme-toggle-btn {
    position: fixed;
    top: 2.5rem;
    right: 9.5rem;
    z-index: 1100;
}

.index-btn {
    left: 4rem;
}

.download-btn {
    position: fixed;
    bottom: 3rem;
    left: 4rem;
    z-index: 1100;
}

.controls {
    position: fixed;
    bottom: 3rem;
    right: 4rem;
    display: flex;
    gap: 1.5rem;
    z-index: 1000;
}

.btn-q {
    background: var(--q-btn-bg);
    border: 1px solid var(--q-btn-border);
    color: var(--q-btn-text);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(5px);
}