/* ==========================================================================
   E47 PERFORMANCE — COMPONENT DESIGN SYSTEM: BUTTONS
   Strict unified button system with consistent dimensions, weights & states
   ========================================================================== */
.btn,
.btn-e47-primary,
.btn-e47-secondary,
.btn-e47-success,
.btn-e47-warning,
.btn-e47-danger,
.btn-e47-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    height: 38px;
    padding: 0.45rem 1rem;
    font-family: var(--t-font);
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.01em;
    text-align: center;
    text-decoration: none !important;
    vertical-align: middle;
    border-radius: var(--t-radius-sm, 6px);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color var(--t-transition-fast),
                border-color var(--t-transition-fast),
                box-shadow var(--t-transition-fast),
                transform var(--t-transition-fast),
                color var(--t-transition-fast);
}

.btn:hover,
[class*="btn-e47-"]:hover {
    transform: translateY(-1px);
}
.btn:active,
[class*="btn-e47-"]:active {
    transform: translateY(0);
}
.btn:focus,
[class*="btn-e47-"]:focus {
    box-shadow: 0 0 0 3px rgba(var(--e47-primary-rgb, 214, 179, 108), 0.28) !important;
    outline: none;
}
.btn:disabled,
.btn.disabled,
[class*="btn-e47-"]:disabled {
    opacity: 0.55;
    pointer-events: none;
    box-shadow: none !important;
    transform: none !important;
}

/* Icon placement & spacing */
.btn > i,
.btn > svg,
[class*="btn-e47-"] > i,
[class*="btn-e47-"] > svg {
    font-size: 0.88em;
    line-height: 1;
}

/* Standard Size Variants */
.btn-sm,
.btn-e47-sm {
    height: 32px;
    padding: 0.3rem 0.75rem;
    font-size: 0.78rem;
    border-radius: var(--t-radius-sm, 6px);
}
.btn-xs {
    height: 26px;
    padding: 0.18rem 0.5rem;
    font-size: 0.72rem;
    border-radius: 4px;
    gap: 0.3rem;
}
.btn-lg,
.btn-e47-lg {
    height: 46px;
    padding: 0.65rem 1.4rem;
    font-size: 0.95rem;
    border-radius: var(--t-radius, 10px);
    gap: 0.6rem;
}

/* Square Icon-Only Buttons */
.btn-icon,
.btn-e47-icon {
    width: 36px;
    height: 36px;
    padding: 0 !important;
    border-radius: var(--t-radius-sm, 6px);
}
.btn-icon.btn-sm,
.btn-e47-icon.btn-sm {
    width: 30px;
    height: 30px;
}
.btn-icon.btn-xs {
    width: 24px;
    height: 24px;
}

/* Primary Button (E47 Brand Gold) */
.btn-primary,
.btn-e47-primary {
    background: var(--e47-primary);
    border-color: var(--e47-primary);
    color: #102728 !important;
    font-weight: 700;
    box-shadow: 0 2px 6px rgba(214, 179, 108, 0.32);
}
.btn-primary:hover,
.btn-primary:focus,
.btn-e47-primary:hover,
.btn-e47-primary:focus {
    background: var(--e47-primary-hover) !important;
    border-color: var(--e47-primary-hover) !important;
    color: #0A1819 !important;
    box-shadow: 0 4px 12px rgba(214, 179, 108, 0.42);
}

/* Secondary Button (Neutral Slate / Dark Teal) */
.btn-secondary,
.btn-e47-secondary {
    background: #102728;
    border-color: #102728;
    color: #FFFFFF !important;
    box-shadow: 0 2px 4px rgba(16, 39, 40, 0.15);
}
.btn-secondary:hover,
.btn-secondary:focus,
.btn-e47-secondary:hover,
.btn-e47-secondary:focus {
    background: #193435 !important;
    border-color: #193435 !important;
    color: #FFFFFF !important;
}

/* Semantic Action Buttons */
.btn-success,
.btn-e47-success {
    background: #10B981;
    border-color: #10B981;
    color: #FFFFFF !important;
    box-shadow: 0 2px 6px rgba(16, 185, 129, 0.28);
}
.btn-success:hover,
.btn-success:focus,
.btn-e47-success:hover,
.btn-e47-success:focus {
    background: #059669 !important;
    border-color: #059669 !important;
    color: #FFFFFF !important;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.38);
}

.btn-warning,
.btn-e47-warning {
    background: #D97706;
    border-color: #D97706;
    color: #FFFFFF !important;
    box-shadow: 0 2px 6px rgba(217, 119, 6, 0.28);
}
.btn-warning:hover,
.btn-warning:focus,
.btn-e47-warning:hover,
.btn-e47-warning:focus {
    background: #B45309 !important;
    border-color: #B45309 !important;
    color: #FFFFFF !important;
}

.btn-danger,
.btn-e47-danger {
    background: #EF4444;
    border-color: #EF4444;
    color: #FFFFFF !important;
    box-shadow: 0 2px 6px rgba(239, 68, 68, 0.28);
}
.btn-danger:hover,
.btn-danger:focus,
.btn-e47-danger:hover,
.btn-e47-danger:focus {
    background: #DC2626 !important;
    border-color: #DC2626 !important;
    color: #FFFFFF !important;
}

.btn-info {
    background: #0D9488;
    border-color: #0D9488;
    color: #FFFFFF !important;
}
.btn-info:hover,
.btn-info:focus {
    background: #0F766E !important;
    border-color: #0F766E !important;
    color: #FFFFFF !important;
}

.btn-default,
.btn-light {
    background: var(--t-card-bg);
    border-color: var(--t-border);
    color: var(--t-text) !important;
}
.btn-default:hover,
.btn-light:hover {
    background: var(--t-bg);
    border-color: var(--t-muted);
    color: var(--t-text) !important;
}

/* Outline Variants */
.btn-outline-primary,
.btn-e47-outline {
    color: var(--e47-primary-dark) !important;
    border-color: var(--e47-primary);
    background: transparent;
}
.btn-outline-primary:hover,
.btn-e47-outline:hover {
    background: var(--e47-primary);
    border-color: var(--e47-primary);
    color: #102728 !important;
}
:root[data-theme="dark"] .btn-outline-primary,
:root[data-theme="dark"] .btn-e47-outline {
    color: var(--e47-primary) !important;
}

.btn-outline-secondary {
    color: var(--t-muted) !important;
    border-color: var(--t-border);
    background: transparent;
}
.btn-outline-secondary:hover {
    background: var(--t-border);
    color: var(--t-text) !important;
}

.btn-outline-success {
    color: #10B981 !important;
    border-color: #10B981;
    background: transparent;
}
.btn-outline-success:hover {
    background: #10B981;
    color: #FFFFFF !important;
}

.btn-outline-danger {
    color: #EF4444 !important;
    border-color: #EF4444;
    background: transparent;
}
.btn-outline-danger:hover {
    background: #EF4444;
    color: #FFFFFF !important;
}

.btn-tool {
    color: var(--t-muted);
    border-radius: var(--t-radius-sm);
    height: auto;
    padding: 0.25rem 0.5rem;
}
.btn-tool:hover {
    color: var(--t-primary);
    background: rgba(var(--t-primary-rgb), 0.1);
}

/* Loading state spinner */
.btn.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}
.btn.btn-loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: t-spin 0.6s linear infinite;
}
@keyframes t-spin {
    to { transform: rotate(360deg); }
}