/* =====================================================================
   Payeshco — Engineering Calculator Wizard
   High-Tech Dark Mode · Asymmetric Shape Design
   ===================================================================== */

.calc-page {
    position: relative;
    min-height: 100vh;
    padding-block: calc(var(--header-height) + 2rem) 4rem;
    background: #000;
    color: var(--c-offwhite);
    overflow: hidden;
}

.calc-page__bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.35;
    background:
        repeating-linear-gradient(125deg, transparent, transparent 80px, rgba(128, 0, 32, 0.06) 80px, rgba(128, 0, 32, 0.06) 81px),
        repeating-linear-gradient(55deg, transparent, transparent 60px, rgba(192, 26, 58, 0.04) 60px, rgba(192, 26, 58, 0.04) 61px);
}

.calc-page__bg::before {
    content: "E = I·R  |  ρ = R·A/L  |  NACE SP0169  |  E_corr = E_eq + η  |  I = J·A  |  ASTM G97";
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(0.65rem, 1.2vw, 0.85rem);
    font-weight: 700;
    letter-spacing: 0.25em;
    color: rgba(128, 0, 32, 0.12);
    white-space: nowrap;
    transform: rotate(-8deg);
    user-select: none;
}

.calc-page__intro {
    position: relative;
    z-index: 2;
    max-width: 820px;
    margin-bottom: 2rem;
}

.calc-page__title {
    font-size: clamp(1.9rem, 4.5vw, 3rem);
    font-weight: 900;
    line-height: 1.15;
    margin: 0 0 0.75rem;
}

.calc-page__lead {
    color: var(--c-text-muted);
    margin: 0;
    line-height: 1.85;
    max-width: 40rem;
}

.calc-wizard {
    position: relative;
    z-index: 2;
    background: #0a0a0c;
    border: 1px solid var(--c-border);
    clip-path: polygon(0 0, 100% 0, 100% 97%, 96% 100%, 0 100%);
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.55);
}

[dir="ltr"] .calc-wizard {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 4% 100%, 0 97%);
}

.calc-steps {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--c-border);
    background: rgba(128, 0, 32, 0.08);
    overflow-x: auto;
}

.calc-steps__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    min-width: 72px;
    opacity: 0.45;
    transition: opacity 0.3s ease;
}

.calc-steps__item.is-active,
.calc-steps__item.is-done {
    opacity: 1;
}

.calc-steps__diamond {
    width: 14px;
    height: 14px;
    background: var(--c-black-2);
    border: 2px solid var(--c-border);
    transform: rotate(45deg);
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.calc-steps__item.is-active .calc-steps__diamond,
.calc-steps__item.is-done .calc-steps__diamond {
    background: var(--c-wine);
    border-color: var(--c-wine-bright);
    box-shadow: 0 0 12px rgba(192, 26, 58, 0.45);
}

.calc-steps__label {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--c-text-muted);
    white-space: nowrap;
}

.calc-steps__item.is-active .calc-steps__label {
    color: var(--c-wine-glow);
}

.calc-steps__line {
    flex: 1;
    min-width: 24px;
    height: 2px;
    margin-inline: 0.35rem;
    background: linear-gradient(90deg, var(--c-border), rgba(128, 0, 32, 0.35), var(--c-border));
    transform: skewX(-24deg);
}

.calc-wizard__body {
    padding: 1.75rem 1.5rem 1rem;
    min-height: 360px;
}

.calc-panel__title {
    font-size: 1.15rem;
    font-weight: 900;
    margin: 0 0 1rem;
    color: #fff;
}

.calc-panel__hint {
    font-size: 0.82rem;
    color: var(--c-text-muted);
    margin: 0 0 0.65rem;
}

.calc-dept-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.calc-dept-btn {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1rem 1.1rem;
    text-align: start;
    background: #000;
    border: 1px solid var(--c-border);
    color: inherit;
    cursor: pointer;
    clip-path: polygon(0 0, 100% 0, 96% 100%, 4% 100%);
    transition: border-color 0.25s ease, background 0.25s ease, transform 0.2s ease;
}

.calc-dept-btn:hover {
    border-color: var(--c-wine);
}

.calc-dept-btn.is-selected {
    border-color: var(--c-wine-bright);
    background: rgba(128, 0, 32, 0.22);
    transform: scale(1.02);
}

.calc-dept-btn__title {
    font-size: 0.92rem;
    font-weight: 800;
    color: #fff;
}

.calc-dept-btn__desc {
    font-size: 0.72rem;
    color: var(--c-text-muted);
    line-height: 1.45;
}

.calc-structure-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.65rem;
}

.calc-structure-btn {
    padding: 0.75rem 0.85rem;
    font-size: 0.82rem;
    font-weight: 700;
    background: #000;
    border: 1px solid var(--c-border);
    color: var(--c-offwhite);
    cursor: pointer;
    clip-path: polygon(6% 0, 100% 0, 94% 100%, 0 100%);
    transition: border-color 0.25s ease, background 0.25s ease;
}

.calc-structure-btn.is-selected {
    border-color: var(--c-wine);
    background: rgba(128, 0, 32, 0.2);
    color: var(--c-wine-glow);
}

.calc-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.calc-field--full {
    grid-column: 1 / -1;
}

.calc-field__label {
    display: block;
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--c-wine-glow);
    letter-spacing: 0.04em;
    margin-bottom: 0.35rem;
}

.calc-field input,
.calc-field select,
.calc-field textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    font-family: inherit;
    font-size: 0.9rem;
    color: #fff;
    background: #000;
    border: 1px solid var(--c-border);
    clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
    transition: border-color 0.2s ease;
}

.calc-field input:focus,
.calc-field select:focus,
.calc-field textarea:focus {
    outline: none;
    border-color: var(--c-wine);
}

.calc-life-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.calc-life-btn {
    padding: 0.5rem 1rem;
    font-size: 0.82rem;
    font-weight: 700;
    background: #000;
    border: 1px solid var(--c-border);
    color: var(--c-offwhite);
    cursor: pointer;
    clip-path: polygon(0 0, 100% 0, 94% 100%, 6% 100%);
    transition: border-color 0.2s ease, background 0.2s ease;
}

.calc-life-btn.is-selected {
    border-color: var(--c-wine);
    background: rgba(128, 0, 32, 0.25);
    color: var(--c-wine-glow);
}

.calc-coating-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.calc-coating-btn {
    padding-block: 0.75rem;
    padding-inline: 1.35rem 1.15rem;
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.5;
    text-align: start;
    background: #000;
    border: 1px solid var(--c-border);
    color: var(--c-offwhite);
    cursor: pointer;
    clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
    transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.calc-coating-btn:hover {
    border-color: var(--c-wine);
}

.calc-coating-btn.is-selected {
    border-color: var(--c-wine-bright);
    background: rgba(128, 0, 32, 0.25);
    color: var(--c-wine-glow);
    box-shadow: 0 0 16px rgba(128, 0, 32, 0.2);
}

[dir="ltr"] .calc-coating-btn {
    clip-path: polygon(2% 0, 100% 0, 100% 100%, 0 98%);
}

.calc-field-error {
    display: block;
    margin: 0.35rem 0 0;
    font-size: 0.78rem;
    font-weight: 600;
    color: #ff6b7a;
}

.calc-field-error[hidden] {
    display: none !important;
}

.calc-loading[hidden] {
    display: none !important;
}

.calc-results[hidden] {
    display: none !important;
}

.calc-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    min-height: 220px;
}

.calc-loading__shapes {
    display: flex;
    gap: 0.65rem;
}

.calc-loading__shapes span {
    width: 28px;
    height: 28px;
    background: var(--c-wine);
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    animation: calcPulse 0.9s ease-in-out infinite;
}

.calc-loading__shapes span:nth-child(2) { animation-delay: 0.15s; }
.calc-loading__shapes span:nth-child(3) { animation-delay: 0.3s; }

@keyframes calcPulse {
    0%, 100% { transform: rotate(45deg) scale(0.75); opacity: 0.45; }
    50% { transform: rotate(45deg) scale(1.1); opacity: 1; }
}

.calc-loading__text {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--c-wine-glow);
    margin: 0;
}

.calc-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.85rem;
}

.calc-result-card {
    padding: 1.1rem 1.15rem;
    background: #000;
    border: 1px solid var(--c-border);
    clip-path: polygon(0 0, 100% 0, 100% 92%, 90% 100%, 0 100%);
    transition: border-color 0.25s ease;
}

.calc-result-card:hover {
    border-color: var(--c-wine);
}

.calc-result-card__qty {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--c-wine-glow);
    line-height: 1;
    margin-bottom: 0.35rem;
}

.calc-result-card__unit {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--c-text-muted);
    margin-bottom: 0.5rem;
}

.calc-result-card__title {
    font-size: 0.88rem;
    font-weight: 800;
    color: #fff;
    margin: 0 0 0.65rem;
    line-height: 1.35;
}

.calc-result-card__link {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--c-wine-glow);
    text-decoration: none;
}

.calc-result-card__link:hover {
    color: #fff;
}

.calc-quote-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--c-border);
    clip-path: polygon(0 0, 100% 0, 100% 96%, 97% 100%, 0 100%);
}

.calc-quote-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 7rem 9rem;
    align-items: center;
    gap: 0.75rem 1rem;
    padding: 0.55rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.85rem;
}

.calc-quote-row:last-child {
    border-bottom: none;
}

.calc-quote-row__name {
    font-weight: 700;
    color: #fff;
    line-height: 1.45;
}

.calc-quote-row__qty {
    font-weight: 800;
    color: var(--c-wine-glow);
    text-align: center;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
    justify-self: center;
}

.calc-quote-row__link {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--c-text-muted);
    text-decoration: none;
    text-align: end;
    white-space: nowrap;
    justify-self: end;
}

.calc-quote-row__link:hover {
    color: var(--c-wine-glow);
}

.calc-success {
    margin-block-start: 1.5rem;
    padding: 1.5rem;
    text-align: center;
    background: rgba(128, 0, 32, 0.15);
    border: 1px solid var(--c-wine);
    clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

.calc-success__title {
    font-size: 1.2rem;
    font-weight: 900;
    color: #fff;
    margin: 0 0 0.5rem;
}

.calc-success__lead {
    font-size: 0.88rem;
    color: var(--c-text-muted);
    margin: 0 0 1.25rem;
    line-height: 1.75;
}

.calc-success__code {
    display: inline-flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1rem 2rem;
    background: #000;
    border: 2px solid var(--c-wine-bright);
    clip-path: polygon(0 0, 100% 0, 96% 100%, 4% 100%);
}

.calc-success__code-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--c-wine-glow);
    letter-spacing: 0.08em;
}

.calc-success__code strong {
    font-size: 1.35rem;
    font-weight: 900;
    color: #fff;
    letter-spacing: 0.06em;
}

.calc-wizard__actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.5rem 1.35rem;
    border-top: 1px solid var(--c-border);
    background: rgba(0, 0, 0, 0.4);
}

.calc-nav-btn {
    padding: 0.7rem 1.35rem;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 800;
    border: none;
    cursor: pointer;
    clip-path: polygon(0 0, 100% 0, 94% 100%, 6% 100%);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.calc-nav-btn--primary {
    background: var(--c-wine);
    color: #fff;
    margin-inline-start: auto;
}

.calc-nav-btn--primary:hover {
    background: var(--c-wine-bright);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(128, 0, 32, 0.4);
}

.calc-nav-btn--ghost {
    background: transparent;
    color: var(--c-text-muted);
    border: 1px solid var(--c-border);
}

.calc-nav-btn--ghost:hover {
    color: #fff;
    border-color: var(--c-wine);
}

.calc-nav-btn[hidden] {
    display: none !important;
}

@media (max-width: 768px) {
    .calc-dept-grid,
    .calc-structure-grid,
    .calc-form-grid,
    .calc-coating-options {
        grid-template-columns: 1fr;
    }

    .calc-wizard__actions {
        flex-direction: column-reverse;
    }

    .calc-nav-btn--primary {
        margin-inline-start: 0;
        width: 100%;
    }

    .calc-quote-row {
        grid-template-columns: 1fr;
        gap: 0.35rem;
    }

    .calc-quote-row__qty,
    .calc-quote-row__link {
        justify-self: start;
        text-align: start;
    }
}

[dir="ltr"] .calc-dept-btn {
    clip-path: polygon(4% 0, 100% 0, 100% 100%, 0 96%);
}

[dir="ltr"] .calc-structure-btn {
    clip-path: polygon(0 0, 94% 0, 100% 100%, 6% 100%);
}