:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #a855f7;
    --bg-main: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.85);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: rgba(226, 232, 240, 0.8);
    --radius-lg: 20px;
    --radius-md: 12px;
    --shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --glass-border: 1px solid rgba(255, 255, 255, 0.3);
    --transition: all 0.4s cubic-bezier(0. elevation, 0, 0, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: radial-gradient(circle at top left, #eef2ff 0%, #f8fafc 40%, #f5f3ff 100%);
    color: var(--text-main);
    min-height: 100vh;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 850px;
    animation: fadeInSlide 0.8s ease-out forwards;
    opacity: 0;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.75rem;
}

header p {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-premium);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

.input-group {
    margin-bottom: 2rem;
}

.input-group label {
    display: block;
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    color: var(--text-main);
}

textarea {
    width: 100%;
    min-height: 180px;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.6);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1.05rem;
    color: var(--text-main);
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.char-count {
    text-align: right;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

.platform-selection {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.platform-checkbox {
    display: none;
}

.platform-btn {
    padding: 0.75rem 1.5rem;
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: var(--transition);
    user-select: none;
}

.platform-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.platform-checkbox:checked+.platform-btn {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.generate-btn {
    width: 100%;
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.15rem;
    font-weight: 800;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1.5rem;
    box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.4);
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.5);
}

.generate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    background: #94a3b8;
}

/* Loading Area */
#loading-area {
    display: none;
    margin-top: 3rem;
}

.loading-text {
    text-align: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--primary);
    letter-spacing: 0.05em;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 2.5rem;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    transition: width 0.4s ease;
}

.skeleton-container {
    display: grid;
    gap: 1.5rem;
}

.skeleton-card {
    height: 160px;
    background: linear-gradient(110deg, #f1f5f9 8%, #e2e8f0 18%, #f1f5f9 33%);
    background-size: 200% 100%;
    animation: skeleton-shine 1.5s linear infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-shine {
    to {
        background-position-x: -200%;
    }
}

/* Results Section */
#results-container {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

.result-card {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 2rem;
    box-shadow: var(--shadow-premium);
    animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1.5px solid #f1f5f9;
}

.result-title {
    font-weight: 800;
    font-size: 1.25rem;
    text-transform: capitalize;
    color: var(--text-main);
}

.result-content {
    font-size: 1.05rem;
    color: #334155;
    line-height: 1.8;
    margin-bottom: 2rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--radius-md);
    white-space: pre-wrap;
}

.result-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.action-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: 1.5px solid var(--border);
    background: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.action-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.action-btn.copy-btn.success {
    background: #10b981;
    color: #fff;
    border-color: #10b981;
}

/* Responsive Fixes / Iframe Friendly */
@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .generate-btn {
        padding: 1rem;
        font-size: 1rem;
    }

    .platform-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}