:root {
    --primary: #6366f1;
    --primary-dark: #4338ca;
    --secondary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-input: #f1f5f9;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px 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: 8px;
    --radius-lg: 12px;
}

/* Main layout */
.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Control panel - New horizontal layout */
.control-panel {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 24px;
}

.control-panel form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Main text input - Full width at top */
.input-group:has(#textInput) {
    width: 100%;
    margin-bottom: 8px;
}

.input-group:has(#textInput) input {
    width: 100%;
    padding: 16px 20px;

    text-align: center;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    transition: all 0.2s ease;
}

.input-group:has(#textInput) input::placeholder {
    color: var(--text-muted);
}

/* Horizontal select group */
.select-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 8px;
}

.input-group {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-align: center;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-input);
    transition: all 0.2s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-card);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.input-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg width='12' height='12' viewBox='0 0 16 16' fill='none' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M4 6L8 10L12 6' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    text-align: center;
}

/* Generate button - Full width, prominent */
.generate-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #000;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #fcd34d, #fbbf24);
}

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading in control panel */
.control-panel .loading-state {
    display: none;
    text-align: center;
    padding: 16px;
    color: var(--text-secondary);
}

.control-panel .spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 12px;
}

.control-panel.loading .loading-state {
    display: block;
}

.control-panel.loading .generate-btn {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Error message */
.error-message {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: var(--error);
    padding: 12px;
    border-radius: var(--radius);
    display: none;
    text-align: center;
}

/* Results section */
.results-section {
    background: var(--bg-card);
    display: none;
}

.results-section.visible {
    display: block;
}

/* Loading state */
.loading-state {
    display: none;
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

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

/* Empty state */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Nickname grid */
.nickname-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}

.nickname-item {
    background: #fdfdfd;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nickname-item:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-card);
}

.nickname-text {
    color: var(--text);
    margin-bottom: 4px;
    word-break: break-all;
    line-height: 1.4;
}

.nickname-label {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--border);
    border-radius: 20px;
    padding: 0 12px;
    display: inline-block;
}

.copy-indicator {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--success);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.2s ease;
}

.nickname-item:hover .copy-indicator {
    opacity: 1;
    transform: scale(1);
}

/* Suggestions */
.suggestions-section {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.suggestions-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--secondary), #0891b2);
    color: white;
    text-decoration: none;
    padding: 12px 20px;
    border-radius: var(--radius);
    transition: all 0.2s ease;
}

.suggestions-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* Toast notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success);
    color: white;
    padding: 12px 16px;
    border-radius: var(--radius);
    transform: translateX(400px);
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast.show {
    transform: translateX(0);
}

/* Animation */
.nickname-item {
    animation: fadeInUp 0.3s ease forwards;
}

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

/* ===== SPINNER BORDER BOX - REUSABLE ===== */
.spinner-border-box {
    position: relative;
    border-radius: 14px;
}

.spinner-border-box-inner {
    position: relative;
    z-index: 2;
    border-radius: 14px;
    background: var(--bg-card);
    padding: 3px;
}

.spinner-border-box .spinner-overlay-blur,
.spinner-border-box .spinner-overlay-shine {
    overflow: hidden;
    border-radius: 14px;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
}

.spinner-border-box .spinner-overlay-blur {
    filter: blur(2px);
}

.spinner-border-box .gradient-spinner {
    background: conic-gradient(
        #3186ff00 0deg,
        #34a853 43deg,
        #ffd314 65deg,
        #ff4641 105deg,
        #3186ff 144deg,
        #3186ff 180deg,
        #3186ff00 324deg,
        #3186ff00 360deg
    );
    height: 200%;
    top: -50%;
    right: 0;
    bottom: 0;
    left: 0;
    position: absolute;
    scale: 2 1;
    opacity: 1;
    animation: spin-border 3s linear infinite;
}

/* Background layer che phía sau spinner */
.spinner-border-box::before {
    content: '';
    position: absolute;
    top: 3px;
    right: 3px;
    bottom: 3px;
    left: 3px;
    border-radius: 14px;
    background: var(--bg-card);
    z-index: 1;
    pointer-events: none;
}

.spinner-border-box:hover .gradient-spinner {
    animation-play-state: paused;
}

@keyframes spin-border {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    .control-panel {
        padding: 20px 16px;
    }
    
    .select-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .nickname-grid {
        grid-template-columns: 1fr;
    }
    
    .input-group:has(#textInput) input {
        padding: 14px 16px;
    }
}

@media (max-width: 480px) {
    .generate-btn {
        padding: 14px 20px;
    }
}