/**
 * KhomDev design-system layer — additive enhancements across all pages.
 * Load after page-local styles. Unifies tokens, interaction states, a11y.
 */

:root {
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.2, 0.64, 1);
    --duration-fast: 0.15s;
    --duration-normal: 0.2s;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.42);
    --shadow-lift: 0 14px 36px rgba(0, 0, 0, 0.48);
    --shadow-glow-cyan: 0 0 40px rgba(34, 211, 238, 0.12);
    --shadow-glow-warm: 0 0 24px var(--warm-glow, rgba(249, 115, 22, 0.35));
    --radius-sm: 4px;
    --radius-md: 8px;
    --z-nav: 1000;
    --z-mobile-nav: 1100;
    --z-skip: 1200;
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto !important; }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .terminal-container,
    .terminal-container:hover {
        transform: none !important;
    }
}

/* --- Skip link --- */
.skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: var(--z-skip);
    padding: 0.55rem 1rem;
    font-family: var(--font-display, monospace);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--warm, #D9772B);
    color: var(--bg, #070b14);
    border-radius: var(--radius-sm);
    transform: translateY(-160%);
    transition: transform var(--duration-normal) var(--ease-out);
}
.skip-link:focus {
    transform: translateY(0);
    outline: 2px solid var(--text, #e8e8e8);
    outline-offset: 3px;
}

/* --- Body scroll lock (mobile nav open) --- */
body.nav-open {
    overflow: hidden;
    touch-action: none;
}

/* --- Nav active + hover polish --- */
.nav-links a {
    position: relative;
    transition: color var(--duration-normal) var(--ease-out);
}
.nav-links a.is-active,
.nav-links a.active,
.nav-links a[aria-current="page"] {
    color: var(--warm, #D9772B) !important;
}
@media (hover: hover) {
    .nav-links a:not(.is-active):not(.active):not([aria-current="page"]):hover {
        color: var(--text, #e8e8e8);
    }
}

/* --- Mobile nav overlay — base in site-core.css; polish below --- */
.mobile-nav {
    transition:
        transform var(--duration-normal) var(--ease-out),
        opacity var(--duration-normal) var(--ease-out),
        visibility 0s linear var(--duration-normal);
}
.mobile-nav a {
    transition: color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}
@media (hover: hover) {
    .mobile-nav a:hover { color: var(--warm, #D9772B); transform: translateX(4px); }
}

.mobile-menu-btn {
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}
.mobile-menu-btn:hover { color: var(--warm, #D9772B); }
.mobile-menu-btn:active { transform: scale(0.94); }

/* --- Shared button interaction layer --- */
.btn,
.nav-cta,
.bp-cta,
.bp-cta-alt,
.service-cta,
.mobile-cta-btn,
.buy-panel-btn,
.kh-pay-mini-copy,
.ex-btn {
    transition:
        background var(--duration-normal) var(--ease-out),
        color var(--duration-normal) var(--ease-out),
        border-color var(--duration-normal) var(--ease-out),
        transform var(--duration-fast) var(--ease-out),
        box-shadow var(--duration-normal) var(--ease-out),
        filter var(--duration-fast) var(--ease-out);
}
@media (hover: hover) {
    .btn-primary:hover,
    .nav-cta:hover {
        box-shadow: var(--shadow-glow-warm);
    }
    .terminal-container:hover {
        box-shadow:
            0 0 0 1px rgba(255, 255, 255, 0.05) inset,
            0 28px 56px rgba(0, 0, 0, 0.55),
            var(--shadow-glow-cyan);
    }
}
.btn:active:not(:disabled):not([aria-disabled="true"]),
.nav-cta:active,
.bp-cta:active,
.service-cta:active,
.mobile-cta-btn:active,
.buy-panel-btn:active,
.ex-btn:active {
    transform: scale(0.98);
}
.btn:disabled,
.btn[aria-disabled="true"],
.bp-cta:disabled,
.ex-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}
.btn.is-loading,
.nav-cta.is-loading,
.bp-cta.is-loading,
.bp-cta-alt.is-loading,
.ex-unlock.is-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}
.btn.is-loading::after,
.nav-cta.is-loading::after,
.bp-cta.is-loading::after,
.bp-cta-alt.is-loading::after,
.ex-unlock.is-loading::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: kh-spin 0.65s linear infinite;
    color: var(--warm, #D9772B);
}
@keyframes kh-spin { to { transform: rotate(360deg); } }

/* Project + case study pages — warm primary CTA (wins when loaded last in head) */
.btn.btn-primary {
    background: var(--warm, #D9772B);
    color: var(--bg, #070b14);
    border-color: var(--warm, #D9772B);
}
@media (hover: hover) {
    .btn.btn-primary:hover {
        background: transparent;
        color: var(--warm, #D9772B);
    }
}

/* --- Card lift (purposeful, not decorative) --- */
.project-card,
.bp-card,
.case-card,
.service-card,
.agent-card,
.stake-card,
.contact-method {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
    transition:
        transform var(--duration-normal) var(--ease-out),
        box-shadow var(--duration-normal) var(--ease-out),
        border-color var(--duration-normal) var(--ease-out);
}
@media (hover: hover) {
    .project-card:hover,
    .bp-card:hover,
    .case-card:hover,
    .service-card:hover,
    .agent-card:hover,
    .stake-card:hover,
    .contact-method:hover {
        transform: translateY(-2px);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035), var(--shadow-md);
    }
}
@media (prefers-reduced-motion: reduce) {
    .project-card:hover,
    .bp-card:hover,
    .case-card:hover,
    .service-card:hover,
    .agent-card:hover,
    .stake-card:hover,
    .contact-method:hover {
        transform: none;
    }
}

/* --- FAQ / details polish --- */
.faq-item summary {
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out);
}
.faq-item[open] summary { color: var(--warm, #D9772B); }

/* --- Mobile sticky CTA safe area --- */
.mobile-cta-bar {
    padding-bottom: max(0.85rem, env(safe-area-inset-bottom, 0px));
}

/* --- Touch targets (coarse pointers) --- */
@media (pointer: coarse) {
    .mobile-menu-btn {
        min-width: 48px;
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .nav-cta,
    .mobile-cta-btn {
        min-height: 48px;
        display: inline-flex;
        align-items: center;
    }
    .mobile-nav a {
        min-height: 48px;
        display: flex;
        align-items: center;
        padding: 0.85rem 2rem;
    }
}

/* --- Hover-none: suppress lift transforms --- */
@media (hover: none) {
    .project-card:hover,
    .bp-card:hover,
    .case-card:hover,
    .service-card:hover,
    .agent-card:hover,
    .stake-card:hover,
    .contact-method:hover {
        transform: none;
        box-shadow: none;
    }
}

/* --- Form fields (contact, explorer search) --- */
input[type="search"],
input[type="email"],
input[type="text"],
textarea {
    transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--warm, #D9772B);
    outline-offset: 2px;
}
input:user-invalid:not(:placeholder-shown),
textarea:user-invalid:not(:placeholder-shown) {
    border-color: var(--red, #EF4444);
}

/* --- Skeleton loader utility --- */
.kh-skeleton {
    background: linear-gradient(90deg, var(--surface, #151515) 25%, var(--surface-2, #1c1c1c) 50%, var(--surface, #151515) 75%);
    background-size: 200% 100%;
    animation: kh-shimmer 1.4s ease-in-out infinite;
    border-radius: var(--radius-sm);
}
@keyframes kh-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
@media (prefers-reduced-motion: reduce) {
    .kh-skeleton { animation: none; opacity: 0.6; }
}

.ex-loading {
    font-family: var(--font-mono, monospace);
    font-size: 0.78rem;
    color: var(--text-muted, #888);
    letter-spacing: 0.04em;
}
.ex-loading.gone {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease-out, ease);
}

.kh-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.55s var(--ease-out, cubic-bezier(0.4, 0, 0.2, 1)),
                transform 0.55s var(--ease-out, cubic-bezier(0.4, 0, 0.2, 1));
}
.kh-reveal.is-revealed {
    opacity: 1;
    transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
    .kh-reveal { opacity: 1; transform: none; transition: none; }
}

/* --- Form feedback --- */
.kh-field-error {
    display: block;
    font-family: var(--font-mono, monospace);
    font-size: 0.72rem;
    color: var(--red, #EF4444);
    margin-top: 0.35rem;
}
.kh-field-success {
    display: block;
    font-family: var(--font-mono, monospace);
    font-size: 0.72rem;
    color: var(--accent, #D6DAE1);
    margin-top: 0.35rem;
}
input.is-invalid,
.ex-code-input.is-invalid {
    border-color: var(--red, #EF4444) !important;
}
input.is-valid,
.ex-code-input.is-valid {
    border-color: var(--accent, #D6DAE1) !important;
}

/* --- Project closing CTA --- */
.project-cta-close {
    text-align: center;
    padding: 4rem 2rem 1rem;
    border-top: 1px solid var(--border-dim, #1a1a1a);
    margin-top: 2rem;
}
.project-cta-close h2 {
    font-family: var(--font-display, monospace);
    font-weight: 400;
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
}
.project-cta-close p {
    color: var(--text-muted, #888);
    max-width: 46ch;
    margin: 0 auto 1.75rem;
    line-height: 1.6;
}

/* --- Pay copy success flash --- */
.kh-pay-mini-copy.is-copied {
    border-color: var(--accent, #D6DAE1);
    color: var(--accent, #D6DAE1);
}