/* ============================================================
   Solvyr v2 — Components (buttons, nav, forms, cards, footer, toasts)
   ============================================================ */

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 0.95rem 1.4rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    white-space: nowrap;
    transition: transform var(--dur-2) var(--ease-out),
                background var(--dur-2) var(--ease-out),
                color var(--dur-2) var(--ease-out),
                border-color var(--dur-2) var(--ease-out),
                box-shadow var(--dur-2) var(--ease-out);
    cursor: pointer;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary {
    background: var(--amber-500);
    color: var(--ink-900);
    border-color: var(--amber-500);
}
.btn--primary:hover:not(:disabled) {
    background: var(--amber-300);
    border-color: var(--amber-300);
    transform: translateY(-1px);
    box-shadow: 0 12px 30px -10px rgba(255, 176, 32, 0.5);
}
.btn--outline {
    background: transparent;
    color: var(--paper);
    border-color: rgba(247, 246, 242, 0.25);
}
.btn--outline:hover:not(:disabled) {
    border-color: var(--amber-500);
    color: var(--amber-500);
}
.btn--ghost {
    background: transparent;
    color: var(--paper);
    border-color: transparent;
    padding: 0.75rem 1rem;
}
.btn--ghost:hover:not(:disabled) { color: var(--amber-500); }
.btn--link {
    padding: 0.25rem 0;
    background: transparent;
    color: var(--paper);
    border: 0;
    border-bottom: 1px solid var(--amber-500);
    border-radius: 0;
}
.btn--link:hover { color: var(--amber-500); }
.btn--sm {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
}
.btn--lg { padding: 1.1rem 1.8rem; font-size: 1rem; }
.btn--block { display: flex; width: 100%; justify-content: center; }
.btn .arrow {
    transition: transform var(--dur-2) var(--ease-out);
    display: inline-block;
}
.btn:hover .arrow { transform: translateX(3px); }

/* ---- Chips / Data badges ---- */
.chip {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.7rem;
    border-radius: var(--radius-sm);
    background: var(--ink-800);
    border: 1px solid var(--ink-700);
    color: var(--paper-dim);
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
}
.chip strong {
    color: var(--amber-500);
    font-weight: 700;
    margin-right: 0.2rem;
}
.chip--dot::before {
    content: '';
    display: inline-block;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--sage-400);
}
.chip--plain { background: transparent; border-color: var(--ink-600); }

/* ---- Navigation ---- */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(11, 13, 18, 0.78);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom: 1px solid var(--ink-700);
    height: var(--nav-h);
}
.nav__inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}
.nav__brand {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.3rem;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    color: var(--paper);
}
.nav__brand .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--amber-500);
    display: inline-block;
    box-shadow: 0 0 10px rgba(255, 176, 32, 0.6);
}
.nav__links {
    display: flex;
    gap: 2rem;
    font-size: 0.95rem;
    list-style: none;
    margin: 0; padding: 0;
}
.nav__link {
    color: var(--paper-dim);
    position: relative;
    padding-bottom: 3px;
    transition: color var(--dur-2) var(--ease-out);
}
.nav__link:hover { color: var(--paper); }
.nav__link.is-active { color: var(--paper); }
.nav__link.is-active::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 1.5px;
    background: var(--amber-500);
}

/* Mobile nav */
.nav__toggle {
    display: none;
    width: 40px; height: 40px;
    padding: 10px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border-radius: var(--radius-sm);
}
.nav__toggle-lines {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 20px;
}
.nav__toggle-lines span {
    display: block;
    height: 2px;
    background: var(--paper);
    border-radius: 2px;
    transition: transform var(--dur-2) var(--ease-out),
                opacity var(--dur-2) var(--ease-out);
}
.nav__toggle[aria-expanded='true'] .nav__toggle-lines span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.nav__toggle[aria-expanded='true'] .nav__toggle-lines span:nth-child(2) {
    opacity: 0;
}
.nav__toggle[aria-expanded='true'] .nav__toggle-lines span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.nav__cta { display: inline-flex; }

@media (max-width: 860px) {
    /* iPad Safari + Android Chrome: backdrop-filter on .nav creates a containing block
       that traps position:fixed children, which breaks the drawer in portrait mode.
       Drop backdrop-filter at mobile/tablet widths and use a solid bg instead. */
    .nav {
        background: rgba(11, 13, 18, 0.96);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
    .nav__toggle { display: flex; }
    .nav__links-wrap {
        position: fixed;
        top: var(--nav-h); left: 0; right: 0;
        background: var(--ink-900);
        border-bottom: 1px solid var(--ink-700);
        padding: 1rem 1.5rem 2rem;
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
        z-index: 60; /* above .nav (z-index: 50) — failsafe if Safari ever traps us in nav's stacking context */
        /* Hidden state: fully offscreen + invisible so dark bg can't bleed into nav */
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity var(--dur-3) var(--ease-out),
                    transform var(--dur-3) var(--ease-out),
                    visibility 0s linear var(--dur-3);
    }
    .nav__links-wrap.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        transition: opacity var(--dur-3) var(--ease-out),
                    transform var(--dur-3) var(--ease-out),
                    visibility 0s linear 0s;
    }
    .nav__links {
        flex-direction: column;
        gap: 0;
    }
    .nav__links a {
        display: block;
        padding: 0.9rem 0;
        border-bottom: 1px solid var(--ink-700);
        font-size: 1.1rem;
    }
    .nav__cta { display: none; }
}

/* ---- Cards ---- */
.card {
    background: var(--ink-800);
    border: 1px solid var(--ink-700);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    position: relative;
    transition: border-color var(--dur-3) var(--ease-out),
                transform var(--dur-3) var(--ease-out),
                box-shadow var(--dur-3) var(--ease-out);
}
.card:hover {
    border-color: rgba(255, 176, 32, 0.4);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.card__num {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--mute-500);
    letter-spacing: 0.05em;
    margin-bottom: 1.25rem;
    display: block;
}
.card__title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: var(--step-2);
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin-bottom: 0.8rem;
}
.card__body {
    color: var(--paper-dim);
    font-size: 0.98rem;
    line-height: 1.6;
}
.card__tag {
    display: inline-flex;
    gap: 0.4rem;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--ink-700);
    border-radius: var(--radius-pill);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--mute-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 1.25rem;
}
.card__tag-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--sage-400);
}
.card--glow {
    background:
        radial-gradient(circle at 85% 10%, rgba(255, 176, 32, 0.08), transparent 50%),
        var(--ink-800);
}
.card--link {
    cursor: pointer;
    color: inherit;
    display: block;
    text-decoration: none;
}

/* ---- Forms ---- */
.form { --stack: 1.25rem; }
.form__group { display: flex; flex-direction: column; gap: 0.5rem; }
.form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
@media (max-width: 640px) {
    .form__row { grid-template-columns: 1fr; }
}

.form__label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--paper-dim);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.form__label .req {
    color: var(--amber-500);
    font-weight: 700;
}
.form__hint {
    font-size: 0.78rem;
    color: var(--mute-500);
    margin-top: 0.25rem;
}
.form__input,
.form__select,
.form__textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    min-height: 52px;
    background: var(--ink-800);
    border: 1px solid var(--ink-700);
    border-radius: var(--radius-sm);
    color: var(--paper);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--dur-2) var(--ease-out),
                box-shadow var(--dur-2) var(--ease-out),
                background var(--dur-2) var(--ease-out);
}
.form__textarea {
    min-height: 140px;
    padding: 1rem;
    resize: vertical;
    line-height: 1.5;
}
.form__input:hover,
.form__select:hover,
.form__textarea:hover {
    border-color: var(--ink-500);
}
.form__input:focus,
.form__select:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--amber-500);
    box-shadow: var(--shadow-ring);
    background: var(--ink-900);
}
.form__input::placeholder,
.form__textarea::placeholder { color: var(--mute-700); }
.form__select {
    appearance: none;
    -webkit-appearance: none;
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' stroke='%23C8C6BE' stroke-width='1.5' fill='none' stroke-linecap='round'/></svg>");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 12px 8px;
}
.form__input.is-error,
.form__select.is-error,
.form__textarea.is-error {
    border-color: var(--coral-500);
}
.form__error {
    color: var(--coral-500);
    font-size: 0.82rem;
    margin-top: 0.25rem;
    display: block;
}

.form__section {
    padding-bottom: 2rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--ink-700);
}
.form__section:last-child { border: 0; margin: 0; padding: 0; }
.form__section-title {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--amber-500);
    margin-bottom: 1rem;
}

/* ---- Footer ---- */
.footer {
    padding: 4rem 0 2.5rem;
    border-top: 1px solid var(--ink-700);
    font-size: 0.9rem;
}
.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}
@media (max-width: 860px) {
    .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
    .footer__grid { grid-template-columns: 1fr; }
}
.footer__brand {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--paper);
    margin-bottom: 1rem;
}
.footer__brand .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--amber-500);
}
.footer__tagline {
    color: var(--paper-dim);
    font-size: 0.92rem;
    line-height: 1.5;
    max-width: 32ch;
}
.footer__heading {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--amber-500);
    margin-bottom: 1rem;
}
.footer__links { display: flex; flex-direction: column; gap: 0.6rem; }
.footer__links a {
    color: var(--paper-dim);
    transition: color var(--dur-2) var(--ease-out);
    font-size: 0.93rem;
}
.footer__links a:hover { color: var(--amber-500); }

.footer__meta {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 1px solid var(--ink-700);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--mute-500);
}
.footer__meta a { color: var(--mute-500); }
.footer__meta a:hover { color: var(--amber-500); }

/* ---- Toast notifications
       (toast.js outputs single-dash class names; styled here to match v2.) ---- */
.toast-container {
    position: fixed;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}
.toast-top-right    { top: 1rem; right: 1rem; }
.toast-top-left     { top: 1rem; left: 1rem; }
.toast-bottom-right { bottom: 1rem; right: 1rem; }
.toast-bottom-left  { bottom: 1rem; left: 1rem; }

.toast {
    background: var(--ink-800);
    border: 1px solid var(--ink-700);
    border-left: 3px solid var(--amber-500);
    color: var(--paper);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.92rem;
    max-width: 400px;
    pointer-events: auto;
    animation: toastIn var(--dur-3) var(--ease-out);
}
.toast-success { border-left-color: var(--sage-400); }
.toast-error   { border-left-color: var(--coral-500); }
.toast-warning { border-left-color: var(--amber-500); }
.toast-info    { border-left-color: var(--paper-dim); }
/* BEM aliases (in case something calls the modifier form) */
.toast--success { border-left-color: var(--sage-400); }
.toast--error   { border-left-color: var(--coral-500); }
.toast--warning { border-left-color: var(--amber-500); }
.toast--info    { border-left-color: var(--paper-dim); }

.toast-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.35rem;
}
.toast-icon {
    font-size: 1rem;
    color: var(--amber-500);
    flex-shrink: 0;
}
.toast-success .toast-icon { color: var(--sage-400); }
.toast-error   .toast-icon { color: var(--coral-500); }
.toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--paper);
    flex: 1;
}
.toast-close {
    background: none;
    border: 0;
    color: var(--mute-500);
    padding: 0.25rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: color var(--dur-2) var(--ease-out);
    border-radius: var(--radius-xs);
}
.toast-close:hover { color: var(--paper); }
.toast-body { color: var(--paper-dim); line-height: 1.5; }
.toast-message { margin: 0; font-size: 0.9rem; }
.toast-persistent-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--amber-500);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.5rem;
    display: inline-block;
}
.toast-details-toggle { margin-top: 0.5rem; }
.toast-details-btn {
    background: none;
    border: 0;
    color: var(--amber-500);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    cursor: pointer;
    padding: 0.25rem 0;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}
.toast-details-btn:hover { color: var(--amber-300); }
.toast-details-content {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--ink-900);
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--paper-dim);
}
.toast-trace {
    margin: 0.5rem 0 0;
    padding: 0.5rem;
    background: var(--ink-900);
    border: 1px solid var(--ink-700);
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--paper-dim);
    overflow-x: auto;
    white-space: pre-wrap;
    max-height: 200px;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: none; }
}

/* ---- Data row (used for stats, metadata lines) ---- */
.data-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem 2.5rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--mute-500);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    align-items: center;
}
.data-row__item {
    display: inline-flex;
    align-items: baseline;
    gap: 0.5rem;
}
.data-row__num {
    color: var(--amber-500);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0;
}
.data-row__sep {
    color: var(--amber-500);
    opacity: 0.5;
}

/* ---- Divider marker ---- */
.divider-mark {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--mute-500);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: var(--space-5) 0;
}
.divider-mark::before,
.divider-mark::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--ink-700);
}