/* =========================================================
   Shared Button System
   Modern, professional, and accessible UI styling
   ========================================================= */

:root {
    /* Primary (Blue) */
    --btn-primary: #2563eb;
    --btn-primary-hover: #1d4ed8;
    --btn-primary-active: #1e40af;
    
    /* Success (Green) */
    --btn-success: #15803d;
    --btn-success-hover: #166534;
    --btn-success-active: #14532d;
    
    /* Danger (Red) */
    --btn-danger: #dc2626;
    --btn-danger-hover: #b91c1c;
    --btn-danger-active: #991b1b;
    
    /* Info (Cyan/Sky - Un-commented & Standardized) */
    --btn-info: #0284c7;
    --btn-info-hover: #0369a1;
    --btn-info-active: #075985;
    
    /* Warning (Amber) */
    --btn-warning: #b45309;
    --btn-warning-hover: #92400e;
    --btn-warning-active: #78350f;
    
    /* Secondary (Slate) */
    --btn-secondary: #475569;
    --btn-secondary-hover: #334155;
    --btn-secondary-active: #1e293b;
    
    /* Dark (Gray-900) */
    --btn-dark: #1f2937;
    --btn-dark-hover: #111827;
    --btn-dark-active: #030712;

    /* Shadows */
    --btn-shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --btn-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -1px rgba(15, 23, 42, 0.06);
    --btn-shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
    
    /* Focus Ring */
    --btn-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.35);
}

/* --- Base Button Structure --- */
.btn:not(.btn-close) {
    align-items: center;
    border-radius: 8px;
    border: 1px solid transparent;
    box-shadow: var(--btn-shadow-sm);
    display: inline-flex;
    font-size: .875rem;
    font-weight: 600;
    gap: .5rem;
    justify-content: center;
    letter-spacing: .01em;
    line-height: 1.5;
    min-height: 40px;
    padding: .5rem 1rem;
    text-decoration: none;
    transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    user-select: none;
}

/* --- Base Button Interactions --- */
.btn:not(.btn-close):hover,
.btn:not(.btn-close):focus {
    box-shadow: var(--btn-shadow-md);
    transform: translateY(-1px);
}

.btn:not(.btn-close):active,
.btn:not(.btn-close).active {
    box-shadow: var(--btn-shadow-sm);
    transform: translateY(0);
    transition: all 0.05s ease;
}

.btn:not(.btn-close):focus-visible {
    box-shadow: var(--btn-focus-ring);
    outline: none;
}

.btn:disabled,
.btn.disabled {
    box-shadow: none;
    cursor: not-allowed;
    opacity: .55;
    transform: none;
}

/* --- Button Sizing --- */
.btn-xs {
    border-radius: 6px;
    font-size: .75rem;
    min-height: 28px;
    padding: .25rem .6rem;
}

.btn-sm {
    border-radius: 7px;
    font-size: .8125rem;
    min-height: 34px;
    padding: .375rem .75rem;
}

.btn-lg {
    border-radius: 10px;
    font-size: 1rem;
    min-height: 48px;
    padding: .75rem 1.5rem;
}

/* --- Solid Color Variants --- */
.btn-primary,
.btn-primary-600,
.btn-action-primary {
    background-color: var(--btn-primary) !important;
    border-color: var(--btn-primary) !important;
    color: #fff !important;
}
.btn-primary:hover,
.btn-primary:focus,
.btn-primary-600:hover,
.btn-primary-600:focus,
.btn-action-primary:hover,
.btn-action-primary:focus {
    background-color: var(--btn-primary-hover) !important;
    border-color: var(--btn-primary-hover) !important;
}
.btn-primary:active,
.btn-action-primary:active {
    background-color: var(--btn-primary-active) !important;
    border-color: var(--btn-primary-active) !important;
}

.btn-success,
.btn-action-success {
    background-color: var(--btn-success) !important;
    border-color: var(--btn-success) !important;
    color: #fff !important;
}
.btn-success:hover,
.btn-success:focus,
.btn-action-success:hover,
.btn-action-success:focus {
    background-color: var(--btn-success-hover) !important;
    border-color: var(--btn-success-hover) !important;
}
.btn-success:active,
.btn-action-success:active {
    background-color: var(--btn-success-active) !important;
    border-color: var(--btn-success-active) !important;
}

.btn-danger,
.btn-action-danger {
    background-color: var(--btn-danger) !important;
    border-color: var(--btn-danger) !important;
    color: #fff !important;
}
.btn-danger:hover,
.btn-danger:focus,
.btn-action-danger:hover,
.btn-action-danger:focus {
    background-color: var(--btn-danger-hover) !important;
    border-color: var(--btn-danger-hover) !important;
}
.btn-danger:active,
.btn-action-danger:active {
    background-color: var(--btn-danger-active) !important;
    border-color: var(--btn-danger-active) !important;
}


.btn-warning,
.btn-action-warning {
    background-color: var(--btn-warning) !important;
    border-color: var(--btn-warning) !important;
    color: #fff !important;
}
.btn-warning:hover,
.btn-warning:focus,
.btn-action-warning:hover,
.btn-action-warning:focus {
    background-color: var(--btn-warning-hover) !important;
    border-color: var(--btn-warning-hover) !important;
}
.btn-warning:active,
.btn-action-warning:active {
    background-color: var(--btn-warning-active) !important;
    border-color: var(--btn-warning-active) !important;
}

.btn-secondary,
.btn-action-secondary {
    background-color: var(--btn-secondary) !important;
    border-color: var(--btn-secondary) !important;
    color: #fff !important;
}
.btn-secondary:hover,
.btn-secondary:focus,
.btn-action-secondary:hover,
.btn-action-secondary:focus {
    background-color: var(--btn-secondary-hover) !important;
    border-color: var(--btn-secondary-hover) !important;
}
.btn-secondary:active,
.btn-action-secondary:active {
    background-color: var(--btn-secondary-active) !important;
    border-color: var(--btn-secondary-active) !important;
}

.btn-dark,
.btn-action-dark {
    background-color: var(--btn-dark) !important;
    border-color: var(--btn-dark) !important;
    color: #fff !important;
}
.btn-dark:hover,
.btn-dark:focus,
.btn-action-dark:hover,
.btn-action-dark:focus {
    background-color: var(--btn-dark-hover) !important;
    border-color: var(--btn-dark-hover) !important;
}
.btn-dark:active,
.btn-action-dark:active {
    background-color: var(--btn-dark-active) !important;
    border-color: var(--btn-dark-active) !important;
}

/* --- Light / Default Variants --- */
.btn-light,
.btn-default,
.btn-basic {
    background-color: #ffffff !important;
    border-color: #cbd5e1 !important;
    color: #334155 !important;
}
.btn-light:hover,
.btn-light:focus,
.btn-default:hover,
.btn-default:focus,
.btn-basic:hover,
.btn-basic:focus {
    background-color: #f8fafc !important;
    border-color: #94a3b8 !important;
    color: #0f172a !important;
}
.btn-light:active,
.btn-default:active,
.btn-basic:active {
    background-color: #f1f5f9 !important;
    border-color: #64748b !important;
}

/* --- Outline Variants --- */
.btn-outline-primary,
.btn-outline-info,
.btn-outline-success {
    background-color: #ffffff !important;
    border-color: var(--btn-primary) !important;
    color: var(--btn-primary) !important;
}
.btn-outline-primary:hover,
.btn-outline-primary:focus,
.btn-outline-info:hover,
.btn-outline-info:focus,
.btn-outline-success:hover,
.btn-outline-success:focus {
    background-color: var(--btn-primary) !important;
    border-color: var(--btn-primary) !important;
    color: #ffffff !important;
}

.btn-outline-danger {
    background-color: #ffffff !important;
    border-color: var(--btn-danger) !important;
    color: var(--btn-danger) !important;
}
.btn-outline-danger:hover,
.btn-outline-danger:focus {
    background-color: var(--btn-danger) !important;
    border-color: var(--btn-danger) !important;
    color: #ffffff !important;
}

.btn-outline-secondary,
.btn-outline-warning,
.btn-outline-dark {
    background-color: #ffffff !important;
    border-color: #64748b !important;
    color: #475569 !important;
}
.btn-outline-secondary:hover,
.btn-outline-secondary:focus,
.btn-outline-warning:hover,
.btn-outline-warning:focus,
.btn-outline-dark:hover,
.btn-outline-dark:focus {
    background-color: #475569 !important;
    border-color: #475569 !important;
    color: #ffffff !important;
}