/* ==========================================================================
   Knowledge Reels Styles
   ========================================================================== */

:root {
    --reel-bg-1: linear-gradient(135deg, #0f172a, #1e1b4b);
    --reel-bg-2: linear-gradient(135deg, #022c22, #064e3b);
    --reel-bg-3: linear-gradient(135deg, #4c0519, #7f1d1d);
    --kr-text: #ffffff;
    --kr-accent: #38bdf8;
    --kr-glass: rgba(255, 255, 255, 0.1);
}

html, body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh; /* Mobile browser height fix */
    overflow: hidden; /* Prevent body scrolling */
    background: #000;
    font-family: 'Outfit', sans-serif;
    overscroll-behavior: none;
}

/* ─── Reels Container ──────────────────────────────────── */
.reels-container {
    width: 100%;
    height: 100dvh;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}
.reels-container::-webkit-scrollbar {
    display: none;
}

/* ─── Single Reel Frame ────────────────────────────────── */
.reel {
    width: 100%;
    height: 100dvh;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

/* Animated gradient backgrounds for visual flair */
.bg-style-0 { background: linear-gradient(45deg, #0f172a, #20113d, #0f172a); background-size: 400% 400%; animation: bgShift 15s ease infinite; }
.bg-style-1 { background: linear-gradient(45deg, #064e3b, #022c22, #001712); background-size: 400% 400%; animation: bgShift 15s ease infinite; }
.bg-style-2 { background: linear-gradient(45deg, #4c0519, #7f1d1d, #2d020d); background-size: 400% 400%; animation: bgShift 15s ease infinite; }
.bg-style-3 { background: linear-gradient(45deg, #1e3a8a, #031338, #172554); background-size: 400% 400%; animation: bgShift 15s ease infinite; }

@keyframes bgShift {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}

/* ─── Header Overlay ────────────────────────────────────── */
.kr-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    box-sizing: border-box;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent);
    color: white;
}

.back-btn {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    padding: 8px 15px;
    background: var(--kr-glass);
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.kr-title {
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.audio-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    background: var(--kr-glass);
    padding: 8px;
    border-radius: 50%;
    backdrop-filter: blur(10px);
}

/* ─── Reel Content Area (Center) ────────────────────────── */
.reel-content {
    width: 85%;
    max-width: 500px;
    text-align: center;
    z-index: 10;
    padding-bottom: 80px; /* offset for caption */
}

.topic-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
    color: var(--kr-accent);
    border: 1px solid rgba(255,255,255,0.1);
}

.fact-title {
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1.2;
    color: white;
    text-shadow: 0 4px 15px rgba(0,0,0,0.8);
    margin: 0;
}

/* ─── Bottom Caption Area ───────────────────────────────── */
.reel-caption {
    position: absolute;
    bottom: 70px;
    left: 20px;
    right: 80px; /* leave space for right sidebar */
    z-index: 10;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
    padding: 40px 15px 15px 15px; /* gradient fade out up top */
    border-radius: 12px;
}

.caption-user {
    font-weight: 800;
    font-size: 1rem;
    color: white;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.caption-user img {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.caption-text {
    font-size: 1.15rem;
    color: #ffffff;
    line-height: 1.5;
    font-weight: 500;
    text-align: center;
    background: rgba(0, 0, 0, 0.4);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    margin-top: 8px;
}

/* ─── Right Sidebar Operations ──────────────────────────── */
.right-sidebar {
    position: absolute;
    bottom: 90px;
    right: 15px;
    display: flex;
    flex-direction: column;
    gap: 25px;
    z-index: 20;
    align-items: center;
}

.action-btn {
    background: none;
    border: none;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.8));
    transition: transform 0.2s;
}

.action-btn:active {
    transform: scale(0.85);
}

.action-icon {
    font-size: 2rem;
    line-height: 1;
}

.action-btn.liked .action-icon {
    color: #ef4444; /* Heart turns red */
    animation: heartPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.action-count {
    font-size: 0.8rem;
    font-weight: 600;
}

@keyframes heartPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.4); }
    100% { transform: scale(1); }
}

/* ─── Floating Hearts (Like Animation) ──────────────────── */
.floating-heart {
    position: absolute;
    font-size: 3rem;
    color: #ef4444;
    pointer-events: none;
    animation: floatUp 1s ease-out forwards;
    z-index: 50;
}

@keyframes floatUp {
    0% { opacity: 1; transform: translateY(0) scale(1) rotate(0deg); }
    100% { opacity: 0; transform: translateY(-150px) scale(1.5) rotate(15deg); }
}

/* ─── Start Screen (To grab audio context) ──────────────── */
.interaction-prompt {
    background: #000;
    color: white;
}
.start-content {
    text-align: center;
}
.pulse-icon {
    font-size: 4rem;
    animation: pulse 1.5s infinite;
    margin-bottom: 20px;
}
.begin-btn {
    margin-top: 30px;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 30px;
    border: none;
    background: white;
    color: black;
    cursor: pointer;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

/* ─── Swipe Hint ────────────────────────────────────────── */
.swipe-hint {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    color: white;
    text-align: center;
    pointer-events: none;
    transition: opacity 0.5s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.swipe-hint span {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 5px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.8);
}

.swipe-arrow {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-10px);}
    60% {transform: translateY(-5px);}
}

/* --- Desktop Ad Compatibility --- */
@media (min-width: 1024px) {
    .right-sidebar {
        right: 180px; /* Shifted left of the 160px side ad */
    }
    .reel-caption {
        right: 250px; /* Increased to follow the shifted sidebar */
    }
}