:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.selectors {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

select {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    flex: 1;
}

.input-container {
    border: 2px dashed var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

textarea {
    width: 100%;
    min-height: 150px;
    border: none;
    resize: vertical;
    outline: none;
    font-size: 1rem;
}

.upload-actions {
    margin-top: 1rem;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

.upload-btn {
    cursor: pointer;
    color: var(--primary);
    font-weight: 500;
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: var(--primary-hover);
}


.solution-card {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    background: #f1f5f9;
    padding: 1.5rem;
    border-radius: 0.5rem;
}

.solution-text {
    font-size: 1.05rem;
    color: var(--text-primary);
    white-space: pre-wrap;
}



.solve-processing {
    background: #94a3b8 !important;
    cursor: wait;
}

.solve-solved {
    background: #10b981 !important;
}

.hidden {
    display: none;
}

.loading {
    text-align: center;
    color: var(--primary);
    font-weight: 500;
    padding: 2rem;
}

.error {
    color: #ef4444;
    background: #fef2f2;
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid #fecaca;
}