:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #22c55e;
    --accent-hover: #16a34a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --font-family: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-family);
}

body {
    background: radial-gradient(circle at top, #1e293b 0%, #0f172a 100%);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

header {
    text-align: center;
    margin-bottom: 28px;
}

.logo-wrapper {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #22c55e, #10b981);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
    color: white;
    box-shadow: 0 8px 16px rgba(34, 197, 94, 0.3);
}

h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.input-group {
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 120px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px;
    color: var(--text-primary);
    font-size: 15px;
    resize: none;
    transition: all 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
}

textarea::placeholder {
    color: var(--text-secondary);
}

.options-group {
    margin-bottom: 24px;
}

.options-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.style-selector {
    display: flex;
    gap: 8px;
}

.style-btn {
    flex: 1;
    padding: 10px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.style-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.style-btn.active {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

#generateBtn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    border: none;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(34, 197, 94, 0.25);
}

#generateBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(34, 197, 94, 0.35);
}

#generateBtn:active {
    transform: translateY(0);
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.output {
    margin-top: 24px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    transition: all 0.4s ease;
    opacity: 1;
    transform: translateY(0);
}

.output.hidden {
    display: none;
    opacity: 0;
    transform: translateY(10px);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.output-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

#captionText {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
}

/* Animations */
@keyframes fadeInSlideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

#captionList p {
    background: #1e293b;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.regenerate-btn {
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.regenerate-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.monetization-tip {
    font-size: 12px;
    opacity: 0.7;
    text-align: center;
    margin-top: 20px;
}