:root {
    --primary: #8a2be2;
    --secondary: #ff007f;
    --lifetime: #ffd700;
    --pay-per-use: #00ffcc;
    --bg-dark: #0b0914;
    --bg-card: rgba(26, 22, 43, 0.7);
    --bg-header: rgba(11, 9, 20, 0.8);
    --bg-input: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-main: #ffffff;
    --text-gray: #b3b3b3;
    --shadow: rgba(0, 0, 0, 0.6);
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --gradient-gold: linear-gradient(135deg, #ff8c00, #ffd700);
}

body.light-mode {
    --bg-dark: #f4f7f6;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-header: rgba(255, 255, 255, 0.9);
    --bg-input: rgba(0, 0, 0, 0.05);
    --border-color: rgba(0, 0, 0, 0.1);
    --text-main: #111111;
    --text-gray: #555555;
    --shadow: rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', sans-serif; }

body {
    background-color: var(--bg-dark); color: var(--text-main);
    overflow-x: hidden; scroll-behavior: smooth;
    transition: background-color 0.4s ease, color 0.4s ease;
}

.bg-animation {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background: radial-gradient(circle at 15% 50%, rgba(138, 43, 226, 0.1), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(255, 0, 127, 0.1), transparent 25%);
    z-index: -1; animation: moveBg 15s infinite alternate;
}
@keyframes moveBg { 0% { transform: scale(1); } 100% { transform: scale(1.1) translate(20px, 20px); } }

header {
    display: flex; justify-content: space-between; align-items: center; padding: 20px 50px;
    background: var(--bg-header); backdrop-filter: blur(15px); position: fixed;
    width: 100%; top: 0; z-index: 1000; border-bottom: 1px solid var(--border-color);
}
.logo { font-size: 24px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a { font-weight: 600; text-decoration: none; color: var(--text-main); transition: 0.3s; }
.nav-links a:hover { color: var(--secondary); }
.btn-theme, .btn-login { background: transparent; border: 2px solid var(--primary); padding: 8px 15px; border-radius: 20px; color: var(--text-main); cursor: pointer; transition: 0.3s; font-weight: 600; }
.btn-theme { border-color: var(--border-color); background: var(--bg-input); }
.btn-login:hover { background: var(--primary); color: white; }
.btn-upgrade { background: var(--gradient); border: none; padding: 8px 20px; border-radius: 20px; color: white; cursor: pointer; transition: 0.3s; font-weight: 600; }
.btn-upgrade:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(255,0,127,0.4); }

.hero { padding: 140px 20px 80px; text-align: center; max-width: 900px; margin: 0 auto; position: relative; }
.offer-badge { display: inline-block; background: rgba(0, 255, 204, 0.1); border: 1px solid var(--pay-per-use); color: var(--pay-per-use); padding: 10px 25px; border-radius: 30px; font-weight: 600; font-size: 16px; margin-bottom: 25px; box-shadow: 0 0 20px rgba(0, 255, 204, 0.2); animation: pulseOffer 2s infinite alternate; }
@keyframes pulseOffer { from { box-shadow: 0 0 10px rgba(0, 255, 204, 0.2); } to { box-shadow: 0 0 25px rgba(0, 255, 204, 0.6); transform: scale(1.02); } }

h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; }
.highlight { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.subtitle { color: var(--text-gray); font-size: 18px; margin-bottom: 40px; }

.input-group { margin-bottom: 20px; text-align: left; max-width: 300px; margin: 0 auto 30px auto; }
.input-group label { display: block; margin-bottom: 8px; color: var(--text-gray); font-size: 14px; font-weight: 600; text-align: center; }
select { width: 100%; padding: 12px; border-radius: 10px; border: 1px solid var(--border-color); background: var(--bg-input); color: var(--text-main); outline: none; }

.gemini-prompt-box { display: flex; align-items: flex-end; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 30px; padding: 10px 15px; box-shadow: 0 10px 30px var(--shadow); backdrop-filter: blur(20px); }
.gemini-prompt-box:focus-within { border-color: var(--primary); }
.icon-btn { background: transparent; border: none; color: var(--text-gray); font-size: 22px; cursor: pointer; padding: 10px; transition: 0.3s; }
textarea { flex-grow: 1; background: transparent; border: none; color: var(--text-main); font-size: 16px; padding: 12px 10px; outline: none; resize: none; max-height: 150px; }
.btn-generate-icon { background: var(--gradient); border: none; color: white; padding: 12px 20px; border-radius: 25px; font-size: 16px; font-weight: 600; cursor: pointer; margin-left: 10px; transition: 0.3s; display: flex; align-items: center; gap: 8px; }

.loader-container { display: none; margin-top: 40px; }
.loader { width: 50px; height: 50px; border: 5px solid var(--border-color); border-top-color: var(--secondary); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 15px; }

.workspace { display: none; grid-template-columns: 250px 1fr 250px; gap: 20px; padding: 40px 50px; margin-top: 20px; border-top: 1px solid var(--border-color); }
.sidebar { background: var(--bg-card); padding: 20px; border-radius: 15px; border: 1px solid var(--border-color); }
.thumbnail-canvas { width: 100%; max-width: 800px; aspect-ratio: 16 / 9; background: #1a162b; background-size: cover; background-position: center; border-radius: 10px; position: relative; overflow: hidden; border: 2px solid var(--border-color); }
.mock-text { font-size: 55px; font-weight: 800; color: white; text-shadow: 5px 5px 0px #000; text-transform: uppercase; position: absolute; top: 40%; left: 30%; cursor: grab; user-select: none; padding: 10px; border: 2px dashed transparent; }

.how-it-works { padding: 60px 50px; text-align: center; background: rgba(0,0,0,0.2); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.how-it-works h2 { font-size: 36px; margin-bottom: 40px; }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1100px; margin: 0 auto; }
.step-card { background: var(--bg-card); padding: 30px 20px; border-radius: 15px; border: 1px solid var(--border-color); position: relative; transition: 0.3s; }
.step-card:hover { transform: translateY(-5px); border-color: var(--secondary); }
.step-number { background: var(--gradient); width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; font-size: 20px; font-weight: 800; color: white; position: absolute; top: -20px; left: 50%; transform: translateX(-50%); box-shadow: 0 5px 15px rgba(255,0,127,0.4); }
.step-card h3 { margin-top: 15px; font-size: 20px; margin-bottom: 10px; }
.step-card p { color: var(--text-gray); font-size: 14px; }
.highlight-20 { color: var(--pay-per-use); font-weight: 600; font-size: 16px; display: block; margin-top: 10px; }

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.8); backdrop-filter: blur(8px); display: none; justify-content: center; align-items: center; z-index: 2000; opacity: 0; transition: 0.3s; }
.modal-overlay.active { display: flex; opacity: 1; }
.modal-content { background: var(--bg-card); padding: 40px; border-radius: 20px; border: 1px solid var(--border-color); text-align: center; max-width: 1200px; width: 95%; position: relative; transform: translateY(50px) scale(0.9); transition: 0.4s; }
.modal-overlay.active .modal-content { transform: translateY(0) scale(1); }
.close-btn { position: absolute; top: 15px; right: 20px; font-size: 28px; cursor: pointer; color: var(--text-gray); }

.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: left; margin-top: 30px; }
.price-card { background: var(--bg-input); border: 1px solid var(--border-color); padding: 30px; border-radius: 15px; display: flex; flex-direction: column; }
.price-card.single { border: 1px solid rgba(0, 255, 204, 0.3); }
.price-card.pro { border: 2px solid var(--primary); transform: scale(1.05); }
.price-card.lifetime { border: 1px solid var(--lifetime); }
.price-card h3 { font-size: 22px; margin-bottom: 10px; }
.price-card .price { font-size: 32px; font-weight: 800; margin-bottom: 20px; }
.price-card ul { list-style: none; margin-bottom: 30px; flex-grow: 1; }
.price-card ul li { margin-bottom: 10px; color: var(--text-gray); font-size: 14px; }
.btn-subscribe { width: 100%; padding: 12px; border-radius: 10px; border: none; font-size: 16px; font-weight: 600; cursor: pointer; margin-top: auto; }
.btn-free { background: var(--bg-dark); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-single { background: transparent; color: var(--pay-per-use); border: 1px solid var(--pay-per-use); }
.btn-pro { background: var(--gradient); color: white; }
.btn-lifetime { background: var(--gradient-gold); color: #000; }

@media (max-width: 900px) {
    .steps-grid { grid-template-columns: 1fr 1fr; gap: 40px 20px; }
    .pricing-grid { grid-template-columns: 1fr 1fr; }
    .price-card.pro { transform: scale(1); }
    .workspace { grid-template-columns: 1fr; }
    header { flex-direction: column; gap: 15px; }
}
@media (max-width: 600px) { .steps-grid, .pricing-grid { grid-template-columns: 1fr; } }