/*
 * LAW: Button System (Phase 2 Update)
 * 
 * Philosophy: Touchable, Calm, Confident.
 * 
 * - Height: 48px standard (Touchable).
 * - Primary: Accent Fill.
 * - Secondary: Outline / Muted.
 * - Ghost: Text Only.
 */

:root {
    --btn-height: 48px;
    --btn-padding: 24px;
    --btn-font-size: var(--text-small);
    --btn-weight: var(--weight-bold);
    --btn-radius: var(--radius-sm);
    --btn-letter-spacing: 0;
    /* No letter-spacing abuse */
}

/* Base Reset */
.btn {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: var(--btn-height);
    padding: 0 var(--btn-padding);
    border-radius: var(--btn-radius);
    font-family: var(--font-stack);
    font-size: var(--btn-font-size);
    font-weight: var(--btn-weight);
    letter-spacing: var(--btn-letter-spacing);
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
}

/* Primary (The One Action) */
.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-accent-contrast);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Secondary (Supportive) */
.btn-secondary {
    background-color: transparent;
    color: var(--color-ink-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-ink-secondary);
    background-color: var(--color-surface-base);
}

/* Ghost (Tertiary) */
.btn-ghost {
    background-color: transparent;
    color: var(--color-ink-secondary);
    padding: 0 var(--space-s);
}

.btn-ghost:hover {
    color: var(--color-ink-primary);
}