/* =============================================================================
   lib/styles/components/buttons.css — Filtra-Core Button Styles
   Covers: PrimaryButton, SecondaryButton, OutlineButton
   ============================================================================= */

/* =============================================================================
   BASE
   ============================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 14px;
    min-height: 44px;
    border: none;
    border-radius: 4px; /* Filtra-Core uses slightly sharper 4px corners for industrial feel */
    font-family: var(--font-sans, 'Inter', sans-serif);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.5px;
    line-height: 1.25;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 200ms ease-out,
        box-shadow 200ms ease-out,
        transform 200ms ease-out,
        opacity 200ms ease-out,
        border-color 200ms ease-out,
        color 200ms ease-out;

    user-select: none;
    -webkit-user-select: none;
}

.btn--full-width { width: 100%; }

.btn__icon {
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    transition: transform 200ms ease-out;
}

.btn__icon--leading { margin-right: 2px; }
.btn__icon--trailing { margin-left: 2px; }

.btn:hover .btn__icon--trailing {
    transform: translateX(3px);
}

/* =============================================================================
   PRIMARY BUTTON — Electric Cyan background, Deep Navy text
   ============================================================================= */
.btn--primary {
    background-color: var(--color-accent, #00B4D8);
    color: var(--color-primary, #0A192F);
    border: 2px solid transparent;
}

.btn--primary:hover:not(:disabled):not(.btn--disabled) {
    background-color: #0096B4; /* Darken Cyan slightly */
    box-shadow: 0px 4px 12px rgba(0, 180, 216, 0.25);
    transform: translateY(-1px);
}

.btn--primary:active:not(:disabled):not(.btn--disabled) {
    background-color: #007790;
    box-shadow: none;
    transform: translateY(0);
}

.btn--primary:focus-visible {
    outline: 3px solid var(--color-gold, #F59E0B);
    outline-offset: 4px;
}

.btn--primary:disabled,
.btn--primary.btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn--primary.btn--loading {
    cursor: not-allowed;
    opacity: 0.85;
}

.btn--primary.btn--loading:hover {
    background-color: var(--color-accent, #00B4D8);
    box-shadow: none;
    transform: none;
}

/* =============================================================================
   SECONDARY BUTTON — Deep Navy background, Light Gray text
   ============================================================================= */
.btn--secondary {
    background-color: var(--color-primary, #0A192F);
    color: var(--color-light-gray, #F3F4F6);
    border: 2px solid transparent;
    box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.10);
}

.btn--secondary:hover:not(:disabled):not(.btn--disabled) {
    background-color: #112A4F; /* Lighten navy */
    box-shadow: 0px 4px 14px rgba(0, 0, 0, 0.18);
    transform: translateY(-1px);
}

.btn--secondary:active:not(:disabled):not(.btn--disabled) {
    background-color: var(--color-primary, #0A192F);
    box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.10);
    transform: translateY(0);
}

.btn--secondary:focus-visible {
    outline: 3px solid var(--color-accent, #00B4D8);
    outline-offset: 4px;
}

.btn--secondary:disabled,
.btn--secondary.btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Gold surface variant (CTA section inversion) */
.section--gold .btn--secondary {
    background-color: var(--color-primary, #0A192F);
    color: var(--color-accent, #00B4D8);
    border-color: transparent;
}

.section--gold .btn--secondary:hover:not(:disabled):not(.btn--disabled) {
    background-color: #112A4F;
    color: var(--color-accent, #00B4D8);
}

/* =============================================================================
   OUTLINE BUTTON — Transparent background, 2px solid border
   ============================================================================= */
.btn--outline {
    background-color: transparent;
    border-width: 2px;
    border-style: solid;
}

.btn--outline:active:not(:disabled):not(.btn--disabled) {
    border-color: var(--color-accent, #00B4D8);
    color: var(--color-accent, #00B4D8);
    background-color: transparent;
    transform: translateY(0);
}

.btn--outline:focus-visible {
    outline: 3px solid var(--color-accent, #00B4D8);
    outline-offset: 4px;
}

.btn--outline:disabled,
.btn--outline.btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Light surface (default) */
.btn--outline-light {
    border-color: var(--color-primary, #0A192F);
    color: var(--color-primary, #0A192F);
}

.btn--outline-light:hover:not(:disabled):not(.btn--disabled) {
    background-color: rgba(10, 25, 47, 0.05);
    transform: translateY(-1px);
}

/* Dark surface */
.btn--outline-dark {
    border-color: var(--color-light-gray, #F3F4F6);
    color: var(--color-light-gray, #F3F4F6);
}

.btn--outline-dark:hover:not(:disabled):not(.btn--disabled) {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: #FFFFFF;
    color: #FFFFFF;
    transform: translateY(-1px);
}

.btn--outline-dark:active:not(:disabled):not(.btn--disabled) {
    background-color: transparent;
    border-color: var(--color-accent, #00B4D8);
    color: var(--color-accent, #00B4D8);
    transform: translateY(0);
}

/* Gold surface variant */
.section--gold .btn--outline {
    border-color: var(--color-primary, #0A192F);
    color: var(--color-primary, #0A192F);
}

.section--gold .btn--outline:hover:not(:disabled):not(.btn--disabled) {
    background-color: rgba(10, 25, 47, 0.08);
}