:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --error-color: #ef4444;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

.background-animation {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, rgba(15,23,42,0) 50%);
    animation: rotate 20s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    z-index: 1;
}

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

h1 {
    font-size: 3rem;
    font-weight: 600;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

p {
    color: #94a3b8;
    font-size: 1.1rem;
}

.search-box {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.search-box:hover {
    transform: translateY(-2px);
}

input {
    width: 100%;
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--glass-border);
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

input:focus {
    border-color: var(--primary-color);
}

button {
    width: 100%;
    padding: 1rem;
    border-radius: 0.5rem;
    border: none;
    background: var(--primary-color);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
}

button:hover {
    background: var(--primary-hover);
}

button:active {
    transform: scale(0.98);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

#loading-state {
    text-align: center;
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid rgba(239, 68, 68, 0.2);
    margin-top: 1.5rem;
    text-align: center;
}

#result-container {
    margin-top: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 2rem;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

#result-topic {
    margin-bottom: 1rem;
    color: #60a5fa;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.markdown-body {
    line-height: 1.6;
    color: #cbd5e1;
    white-space: pre-wrap;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    h1 {
        font-size: 2.5rem;
    }
}