:root {
    --bg-color: #FBFBFB;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --accent-blue: #007AFF;
    --card-bg: rgba(255, 255, 255, 0.7);
    --border-color: rgba(0, 0, 0, 0.05);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.08);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    padding-bottom: 100px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding: 80px 0 60px;
    text-align: center;
}

.logo {
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: 40px;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 3.5rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    color: var(--text-primary);
}

h1 span {
    color: var(--text-secondary);
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Input Section */
.input-section {
    margin-bottom: 80px;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

textarea {
    width: 100%;
    min-height: 180px;
    border: none;
    background: transparent;
    font-size: 1.1rem;
    resize: none;
    color: var(--text-primary);
    outline: none;
    margin-bottom: 24px;
}

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

.controls {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
    align-items: center;
}

.secondary-select {
    padding: 10px 20px;
    border-radius: 99px;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
    transition: all 0.2s ease;
}

.secondary-select:hover {
    background-color: #f9f9f9;
}

.primary-btn {
    background-color: var(--accent-blue);
    color: white;
    border: none;
    padding: 12px 32px;
    border-radius: 99px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.primary-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.primary-btn:active {
    transform: scale(0.98);
}

/* Results Section */
.results-section {
    opacity: 1;
    transition: opacity 0.5s ease;
}

.results-section.hidden {
    display: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.post-card {
    background: white;
    border-radius: 20px;
    padding: 24px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 400px;
    transition: all 0.3s ease;
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.post-type {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.post-content {
    font-size: 1rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    margin-bottom: 24px;
    flex-grow: 1;
}

.copy-btn {
    padding: 10px;
    border: 1px solid var(--border-color);
    background: transparent;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    color: var(--text-primary);
}

.copy-btn:hover {
    background: #f0f0f0;
}

.visual-prompt-box {
    margin-top: 20px;
    padding: 16px;
    background: #f8f8f8;
    border-radius: 12px;
    border: 1px dashed var(--border-color);
    font-size: 0.85rem;
}

.visual-prompt-box strong {
    display: block;
    margin-bottom: 8px;
    color: var(--accent-blue);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.visual-prompt-box p {
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.4;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background: #1D1D1F;
    color: white;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.hidden {
    opacity: 0;
    bottom: 20px;
    pointer-events: none;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }
}