:root {
    --bg-color: #0d0d0d;
    --card-bg: #1a1a1a;
    --primary: #fe2c55; /* TikTok Red */
    --primary-hover: #e02045;
    --text-main: #ffffff;
    --text-muted: #888888;
    --border-radius: 20px;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    /* Grid background effect (optional) */
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.container {
    width: 100%;
    max-width: 480px; /* Mobile app feel */
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.header { text-align: center; margin-bottom: 10px; }
.header h1 { font-size: 24px; font-weight: 800; margin-top: 10px; }
.highlight { color: var(--primary); }
.subtitle { color: var(--text-muted); font-size: 14px; margin-top: 5px; }

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* Inputs */
.input-group, .select-group {
    background-color: #2a2a2a;
    border-radius: 12px;
    display: flex;
    align-items: center;
    padding: 0 15px;
    margin-bottom: 15px;
    position: relative;
}

input, select {
    background: transparent;
    border: none;
    color: white;
    padding: 15px;
    width: 100%;
    outline: none;
    font-size: 16px;
}

.icon-link, .icon-select { color: var(--text-muted); }
select { appearance: none; cursor: pointer; } 

/* Button */
#downloadBtn {
    background-color: var(--primary);
    color: white;
    width: 100%;
    border: none;
    padding: 16px;
    border-radius: 30px; /* Pill shape */
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#downloadBtn:hover { background-color: var(--primary-hover); transform: scale(1.02); }

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    text-align: center;
}
.feature-item span { font-size: 10px; font-weight: bold; color: white; display: block; margin-top: 5px;}
.icon-circle {
    background: #252525;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 20px;
}

/* Instructions */
.instructions h2 { font-size: 18px; display: flex; align-items: center; gap: 10px; margin-bottom: 20px;}
.step { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }
.step-num {
    background: var(--primary);
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}
.step p { font-size: 14px; color: #ddd; }

/* Result Area */
.hidden { display: none !important; }
.user-info { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; border-bottom: 1px solid #333; padding-bottom: 10px; }
.stats span { margin-left: 10px; font-size: 12px; color: var(--text-muted); }

/* Video Player */
video { width: 100%; border-radius: 10px; margin-bottom: 15px; }

/* Buttons */
.btn-secondary {
    display: block;
    width: 100%;
    padding: 12px;
    background: #2a2a2a;
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 10px;
    margin-bottom: 10px;
    font-weight: 600;
    border: none;
    cursor: pointer;
}
.btn-secondary.outline { border: 1px solid #333; background: transparent; }
.btn-secondary:hover { background: #333; }

/* Photo Slider Styles */
.slider-wrapper {
    overflow: hidden;
    width: 100%;
    border-radius: 10px;
    position: relative;
    aspect-ratio: 9/16; /* TikTok ratio */
    background: #000;
}
.slider {
    display: flex;
    transition: transform 0.3s ease-in-out;
    height: 100%;
}
.slider img {
    min-width: 100%;
    object-fit: contain;
    height: 100%;
}
.slider-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    color: white;
}
.slider-controls button {
    background: transparent; border: none; color: white; font-size: 20px; cursor: pointer; padding: 0 15px;
}
.loader {
    border: 4px solid #333; border-top: 4px solid var(--primary); border-radius: 50%; width: 30px; height: 30px;
    animation: spin 1s linear infinite; margin: 10px auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.footer { text-align: center; color: #444; font-size: 12px; margin-top: 20px; font-weight: bold; letter-spacing: 1px;}