:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 0.75rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    padding: 2rem;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

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

header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #1e1b4b;
    letter-spacing: -0.025em;
}

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

/* Forms and Inputs */
.input-wrapper {
    display: flex;
    align-items: center;
    position: relative;
}

input {
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s ease;
    width: 100%;
}

input.listening {
    border-color: #10b981;
    background-color: #ecfdf5;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.input-wrapper input {
    padding-right: 2.5rem; /* Espacio para el micrófono */
}

.input-wrapper .mic-btn {
    position: absolute;
    right: 0.25rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.25rem;
    border-radius: 0.25rem;
    transition: transform 0.2s;
}

.input-wrapper .mic-btn:hover {
    transform: scale(1.1);
}

.input-wrapper .mic-btn:active {
    transform: scale(0.9);
}

input:focus:not(.listening) {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: inherit;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: white;
    color: var(--text-main);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
}

.btn-danger {
    background-color: white;
    color: var(--danger);
    border: 1px solid #fca5a5;
}

.btn-danger:hover {
    background-color: #fef2f2;
}

.btn-outline {
    background-color: transparent;
    border: 1px dashed var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background-color: #eff6ff;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1rem;
    transition: color 0.2s;
}

.btn-icon.delete:hover {
    color: var(--danger);
}

/* Cards (Roca y SubRoca) */
.roca-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    animation: fadeIn 0.3s ease-out;
}

.roca-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.roca-header h2 {
    font-size: 1.25rem;
    color: var(--primary);
    margin: 0;
}

.sub-roca-card {
    background: #f8fafc;
    border-radius: 0.5rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid #e2e8f0;
    margin-left: 1rem;
    position: relative;
}

.sub-roca-card::before {
    content: '';
    position: absolute;
    left: -1rem;
    top: 2rem;
    width: 1rem;
    height: 1px;
    background: var(--border);
}

.sub-rocas-container {
    border-left: 2px solid var(--border);
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.sub-roca-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.mineral-item {
    background: white;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    border: 1px solid var(--border);
    animation: slideIn 0.2s ease-out;
}

.mineral-inputs {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 0.75rem;
    align-items: center;
}

.actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

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

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Loader */
.loader-container {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loader-container.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #e2e8f0;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Responsive */
@media (max-width: 640px) {
    .mineral-inputs {
        grid-template-columns: 1fr;
    }
    
    .roca-header {
        flex-direction: column;
        align-items: stretch;
    }
}