: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;}