/* ==========================================================================
   Concrete Slab Calculator Pro - Base Styles
   Premium SaaS aesthetic, vanilla CSS
   ========================================================================== */

   :root {
    --csc-primary: #b87342;
    --csc-primary-hover: #9c6036;
    --csc-secondary: #f1f5f9;
    --csc-secondary-hover: #e2e8f0;
    --csc-text-main: #0f172a;
    --csc-text-muted: #64748b;
    --csc-border: #cbd5e1;
    --csc-surface: #ffffff;
    --csc-bg: #f8fafc;
    --csc-danger: #ef4444;
    --csc-success: #10b981;
    
    --csc-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --csc-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --csc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --csc-radius-md: 8px;
    --csc-radius-lg: 12px;
    --csc-radius-xl: 16px;
    
    --csc-transition: all 0.2s ease-in-out;
}

/* Base Wrapper */
.csc-pro-wrapper {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--csc-text-main);
    max-width: 860px;
    margin: 1rem auto;
    background: var(--csc-bg);
    border-radius: var(--csc-radius-lg);
    padding: 1rem;
    box-shadow: var(--csc-shadow-lg);
    box-sizing: border-box;
}

.csc-pro-wrapper * {
    box-sizing: border-box;
}

/* Header */
.csc-pro-header {
    text-align: center;
    margin-bottom: 2rem;
}

.csc-pro-header h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--csc-text-main);
}

.csc-pro-header p {
    margin: 0;
    color: var(--csc-text-muted);
    font-size: 1rem;
}

/* Layout Grid */
.csc-pro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
    align-items: start;
}

@media (max-width: 768px) {
    .csc-pro-grid {
        grid-template-columns: 1fr;
        gap: 3vw;
    }
}

/* Cards */
.csc-pro-card {
    display: flex;
    flex-direction: column;
}

.csc-pro-inputs-card {
    background: #e5e7eb;
    border-radius: 4px;
    padding: 1.25rem 1.5rem;
    box-shadow: none;
    border: 1px solid #d1d5db;
}

.csc-pro-inputs-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--csc-border);
}

.csc-pro-inputs-card .csc-pro-inputs-title {
    display: block;
}

.csc-pro-results-card {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.csc-results-container { order: 1; margin-bottom: 20px; }
.csc-results-placeholder { order: 2; margin-bottom: 20px; }

/* Inputs */
.csc-pro-input-group {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.csc-pro-input-group label {
    flex: 0 0 160px;
    text-align: right;
    margin-right: 10px;
    margin-bottom: 0;
    font-size: 14px;
    font-weight: 500;
    color: var(--csc-text-main);
}

.csc-pro-input-wrapper {
    display: flex;
    gap: 6px;
    align-items: center;
}

.csc-pro-input-wrapper input {
    width: 80px;
    border: 1px solid #9ca3af;
    padding: 4px 6px;
    font-size: 14px;
    color: var(--csc-text-main);
    outline: none;
    background: #ffffff;
    border-radius: 3px;
}

.csc-pro-input-wrapper input:focus {
    border-color: var(--csc-primary);
}

.csc-pro-input-wrapper select {
    width: 90px;
    border: 1px solid #9ca3af;
    padding: 4px 6px;
    background: #ffffff;
    color: var(--csc-text-main);
    font-size: 14px;
    outline: none;
    cursor: pointer;
    border-radius: 3px;
    -webkit-appearance: auto !important;
    -moz-appearance: auto !important;
    appearance: auto !important;
}

.csc-pro-input-wrapper select:focus {
    border-color: var(--csc-primary);
}

/* Checkboxes Options */
.csc-pro-options {
    margin: 12px 0 12px 170px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.csc-checkbox-label {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--csc-text-main);
    cursor: pointer;
    user-select: none;
}

.csc-checkbox-label input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.csc-checkbox-custom {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: var(--csc-surface);
    border: 1px solid var(--csc-border);
    border-radius: 4px;
    margin-right: 10px;
    position: relative;
    transition: var(--csc-transition);
}

.csc-checkbox-label:hover input ~ .csc-checkbox-custom {
    border-color: var(--csc-primary);
}

.csc-checkbox-label input:checked ~ .csc-checkbox-custom {
    background-color: var(--csc-primary);
    border-color: var(--csc-primary);
}

.csc-checkbox-custom:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.csc-checkbox-label input:checked ~ .csc-checkbox-custom:after {
    display: block;
}

/* Buttons */
.csc-pro-actions {
    display: flex;
    gap: 10px;
    margin-left: 170px;
    flex-wrap: wrap;
}

.csc-pro-actions.csc-mt-4 {
    margin-top: 1.5rem;
    margin-left: 0;
}

.csc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 16px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 3px;
    cursor: pointer;
    transition: var(--csc-transition);
    border: none;
    gap: 0.5rem;
    white-space: nowrap;
}

.csc-btn-primary {
    background: var(--csc-primary);
    color: white;
    flex: none;
    box-shadow: var(--csc-shadow-sm);
}

.csc-btn-primary:hover {
    background: var(--csc-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--csc-shadow);
}

.csc-btn-secondary {
    background: var(--csc-secondary);
    color: var(--csc-text-main);
    border: 1px solid var(--csc-border);
}

.csc-btn-secondary:hover {
    background: var(--csc-secondary-hover);
}

.csc-btn-outline {
    background: transparent;
    color: var(--csc-text-main);
    border: 1px solid var(--csc-border);
}

.csc-btn-outline:hover {
    background: var(--csc-secondary);
    border-color: var(--csc-text-muted);
}

.csc-btn-text {
    background: transparent;
    color: var(--csc-text-muted);
    padding: 0.5rem 1rem;
}

.csc-btn-text:hover {
    color: var(--csc-text-main);
    background: var(--csc-secondary);
}

.csc-btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
}

/* Tip Box */
.csc-tip-box, .csc-tip {
    margin-top: auto;
    background: rgba(37, 99, 235, 0.05);
    border-left: 4px solid var(--csc-primary);
    padding: 1rem;
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--csc-text-main);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.csc-tip {
    margin-top: 1.5rem;
}

.csc-tip-box p, .csc-tip p {
    margin: 0;
    line-height: 1.4;
}

/* Output Settings & Diagram */
.csc-pro-output-settings {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--csc-secondary);
    padding: 0.75rem 1rem;
    border-radius: var(--csc-radius-md);
}

.csc-pro-output-settings label {
    font-size: 0.875rem;
    font-weight: 500;
}

.csc-pro-output-settings select {
    padding: 0.5rem;
    border: 1px solid var(--csc-border);
    border-radius: 4px;
    font-size: 0.875rem;
    outline: none;
    max-width: 60%;
}



.csc-pro-placeholder {
    display: flex;
    flex-direction: column;
    justify-content: center;
    flex: 1;
}

.csc-pro-diagram-persistent {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    width: 100%;
}

.csc-slab-svg {
    width: 100%;
    max-width: 420px;
    height: auto;
}

/* Results Section */
.csc-result-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.csc-result-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.3rem;
    margin-bottom: 0.5rem;
}



.csc-result-highlight-sm {
    padding: 0.15rem 0.1rem;
}

.csc-result-input {
    flex: 0 1 auto !important;
    width: auto !important;
    min-width: 30px !important;
    max-width: 45px !important;
    background: transparent !important;
    border: none !important;
    border-bottom: 1px dashed rgba(0, 0, 0, 0.3) !important;
    color: var(--csc-text-main) !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    text-align: center !important;
    outline: none !important;
    padding: 0 2px !important;
    margin: 0 !important;
    height: 18px !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    -moz-appearance: textfield;
}

.csc-result-input::-webkit-outer-spin-button,
.csc-result-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.csc-result-input:focus {
    border-bottom: 1px solid var(--csc-text-main);
}

.csc-dropdown-sm {
    flex-shrink: 0 !important;
    font-size: 0.6rem !important;
    padding: 1px 2px !important;
    margin-left: 2px !important;
    max-width: 50px !important;
    width: auto !important;
    height: auto !important;
}

.csc-result-unit-static {
    font-size: 0.75rem;
    font-weight: 700;
    margin-left: 2px;
    color: var(--csc-text-main);
}

.csc-result-bags-needed {
    padding: 0.75rem;
    border-radius: var(--csc-radius-md);
}

.csc-pro-results-content {
    animation: cscFadeIn 0.3s ease-in-out;
}

@keyframes cscFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.csc-result-highlight {
    background: var(--csc-primary);
    color: var(--csc-text-main);
    padding: 0.3rem 0.15rem;
    border-radius: var(--csc-radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.06);
    text-align: center;
    overflow: hidden;
    min-width: 0;
}

.csc-result-label {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    opacity: 1;
    margin-bottom: 0.15rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.csc-res-dropdown {
    background: rgba(255, 255, 255, 0.5) !important;
    border: 1px solid rgba(0, 0, 0, 0.15) !important;
    border-radius: 4px !important;
    color: var(--csc-text-main) !important;
    font-size: 0.75rem !important;
    padding: 2px 4px !important;
    margin-left: 4px !important;
    outline: none !important;
    cursor: pointer !important;
    font-weight: 600 !important;
    width: auto !important;
    max-width: max-content !important;
    height: auto !important;
    line-height: normal !important;
    box-shadow: none !important;
    -webkit-appearance: auto !important;
    -moz-appearance: auto !important;
    appearance: auto !important;
}

.csc-res-dropdown:hover {
    background: rgba(255, 255, 255, 0.8);
}

.csc-res-dropdown option {
    background: white;
    color: black;
}

.csc-result-main {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0;
    gap: 4px;
    min-width: 0;
    max-width: 100%;
}

.csc-result-sub {
    display: block;
    font-size: 0.875rem;
    opacity: 0.8;
}

.csc-volume-conversions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.csc-conv-item {
    background: var(--csc-bg);
    border: 1px solid var(--csc-border);
    padding: 0.75rem;
    border-radius: var(--csc-radius-md);
    text-align: center;
}

.csc-conv-val {
    display: block;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--csc-text-main);
}

.csc-conv-lbl {
    display: block;
    font-size: 0.75rem;
    color: var(--csc-text-muted);
    margin-top: 0.25rem;
}

.csc-materials-section {
    margin-bottom: 0.5rem;
    border-top: 1px solid var(--csc-secondary);
    padding-top: 0.5rem;
}

.csc-materials-section .csc-section-title {
    margin: 0 0 0.5rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--csc-text-main);
}

.csc-material-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.csc-mat-card {
    background: var(--csc-surface);
    border: 1px solid var(--csc-border);
    border-radius: var(--csc-radius-md);
    padding: 1rem 0.5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.csc-mat-block {
    flex-direction: row;
    justify-content: flex-start;
    padding: 1.25rem;
    gap: 1.25rem;
    text-align: left;
    background: rgba(37, 99, 235, 0.05);
    border-color: rgba(37, 99, 235, 0.2);
}

.csc-steel-block {
    background: #f8fafc;
    border-color: #cbd5e1;
    align-items: center;
}

.csc-steel-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.csc-steel-info {
    display: flex;
    flex-direction: column;
}

.csc-mat-lbl-small {
    font-size: 0.7rem;
    color: var(--csc-text-muted);
    margin-top: 0.15rem;
}

.csc-mat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.csc-mat-block .csc-mat-icon {
    margin-bottom: 0;
}

.csc-mat-val {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--csc-text-main);
    display: block;
}

.csc-mat-lbl {
    font-size: 0.75rem;
    color: var(--csc-text-muted);
    margin-top: 0.25rem;
}

/* History Card */
.csc-pro-history-card {
    margin-top: 1.5rem;
}

.csc-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--csc-secondary);
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.csc-history-header h3 {
    margin: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.csc-history-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.csc-empty-state {
    color: var(--csc-text-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: 1rem 0;
    margin: 0;
}

.csc-history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--csc-secondary);
    border-radius: var(--csc-radius-md);
    font-size: 0.875rem;
    animation: cscFadeIn 0.3s ease-in-out;
}

.csc-history-item-details {
    color: var(--csc-text-muted);
}

.csc-history-item-result {
    font-weight: 600;
    color: var(--csc-text-main);
}

/* ==========================================================================
   COMPLETE MOBILE RESPONSIVE — vw-based fluid scaling for ALL screen sizes
   Applies to every element: wrapper, inputs, labels, buttons, result boxes
   ========================================================================== */
@media (max-width: 600px) {

    /* ── Wrapper ── */
    .csc-pro-wrapper {
        padding: 3vw;
        margin: 2vw auto;
        border-radius: 2vw;
    }

    /* ── Header ── */
    .csc-pro-header {
        margin-bottom: 3vw;
    }
    .csc-pro-header h2 {
        font-size: 5vw;
    }
    .csc-pro-header p {
        font-size: 3.5vw;
    }

    /* ── Input card ── */
    .csc-pro-inputs-card {
        padding: 3vw 3.5vw;
    }
    .csc-pro-inputs-title {
        font-size: 4vw;
        margin-bottom: 3vw;
        padding-bottom: 1.5vw;
    }

    /* ── Input rows: stack label above input ── */
    .csc-pro-input-group {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 2.5vw;
    }
    .csc-pro-input-group label {
        flex: none;
        width: 100%;
        text-align: left;
        margin-right: 0;
        margin-bottom: 1vw;
        font-size: 3.5vw;
    }
    .csc-pro-input-wrapper {
        width: 100%;
        gap: 2vw;
    }
    .csc-pro-input-wrapper input {
        flex: 1;
        width: 100%;
        min-width: 0;
        font-size: 3.5vw;
        padding: 1.5vw 2vw;
    }
    .csc-pro-input-wrapper select {
        flex: 1;
        width: 100%;
        min-width: 0;
        font-size: 3.5vw;
        padding: 1.5vw 2vw;
    }

    /* ── Checkboxes ── */
    .csc-pro-options {
        margin-left: 0;
        margin-top: 2vw;
        margin-bottom: 2vw;
        gap: 2vw;
    }
    .csc-checkbox-label {
        font-size: 3.5vw;
    }
    .csc-checkbox-custom {
        width: 5vw;
        height: 5vw;
        min-width: 18px;
        min-height: 18px;
        margin-right: 2vw;
    }

    /* ── Buttons (Calculate / Reset / Copy Results) ── */
    .csc-pro-actions {
        margin-left: 0;
        width: 100%;
        gap: 2vw;
    }
    .csc-btn {
        flex: 1;
        font-size: 3.5vw;
        padding: 2vw 3vw;
        border-radius: 1.5vw;
        white-space: nowrap;
    }

    /* ── Section titles inside results ── */
    .csc-materials-section p,
    .csc-materials-section .csc-section-title {
        font-size: 3.8vw;
        margin-bottom: 2vw;
    }

    /* ── Tip box ── */
    .csc-tip-box, .csc-tip {
        font-size: 3.2vw;
        padding: 3vw;
        gap: 2vw;
    }

    /* ── Output settings bar ── */
    .csc-pro-output-settings {
        flex-direction: column;
        align-items: flex-start;
        gap: 2vw;
        padding: 2.5vw 3vw;
    }
    .csc-pro-output-settings label {
        font-size: 3.5vw;
    }
    .csc-pro-output-settings select {
        font-size: 3.5vw;
        width: 100%;
        max-width: 100%;
    }

    /* ── Diagram SVG ── */
    .csc-slab-svg {
        max-width: 100%;
    }

    /* ── Top 3 result boxes (Volume / Base Area / Total Depth) ── */
    .csc-result-grid-3 {
        grid-template-columns: repeat(3, 1fr);
        gap: 1vw;
    }
    .csc-result-grid-3 .csc-result-highlight {
        padding: 1.5vw 0.8vw;
        overflow: hidden;
        min-width: 0;
    }
    .csc-result-grid-3 .csc-result-label {
        font-size: 2vw;
        letter-spacing: 0;
        margin-bottom: 0.5vw;
        white-space: nowrap;
    }
    .csc-result-grid-3 .csc-result-main {
        font-size: 2.8vw;
        gap: 0.5vw;
        flex-wrap: wrap;
        justify-content: center;
        min-width: 0;
        max-width: 100%;
    }
    .csc-result-grid-3 .csc-result-value {
        font-size: 2.8vw;
        word-break: break-all;
        line-height: 1.2;
        min-width: 0;
    }
    .csc-result-grid-3 .csc-res-dropdown {
        font-size: 2vw !important;
        padding: 0.3vw 0.5vw !important;
        margin-left: 0.3vw !important;
        max-width: unset !important;
        width: auto !important;
        min-width: 0 !important;
    }

    /* ── Bottom 4 result boxes (Density / Weight / Bag Size / Waste) ── */
    .csc-result-grid-4 {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5vw;
    }
    .csc-result-grid-4 .csc-result-highlight {
        padding: 2.5vw 2vw;
        overflow: hidden;
        min-width: 0;
    }
    .csc-result-grid-4 .csc-result-label {
        font-size: 2.5vw;
        letter-spacing: 0.03em;
        margin-bottom: 1vw;
        white-space: nowrap;
    }
    .csc-result-grid-4 .csc-result-main {
        font-size: 3.8vw;
        gap: 1vw;
        flex-wrap: nowrap;
        align-items: center;
        justify-content: center;
        min-width: 0;
        max-width: 100%;
    }
    .csc-result-grid-4 .csc-result-value {
        font-size: 3.8vw;
        font-weight: 700;
        line-height: 1.2;
        min-width: 0;
    }
    .csc-result-grid-4 .csc-result-input {
        font-size: 3.5vw !important;
        max-width: 12vw !important;
        min-width: 8vw !important;
        height: 5vw !important;
        padding: 0 !important;
    }
    .csc-result-grid-4 .csc-res-dropdown,
    .csc-result-grid-4 .csc-dropdown-sm {
        font-size: 2.5vw !important;
        padding: 0.5vw 0.8vw !important;
        margin-left: 0.5vw !important;
        max-width: unset !important;
        width: auto !important;
        min-width: 0 !important;
    }
    .csc-result-grid-4 .csc-result-unit-static {
        font-size: 2.8vw;
        margin-left: 0.5vw;
    }

    /* ── Total Bags Needed big display box ── */
    .csc-result-bags-needed {
        padding: 3vw;
    }
    .csc-result-bags-needed .csc-result-label {
        font-size: 3vw !important;
    }
    .csc-result-bags-needed .csc-result-main {
        font-size: 8vw !important;
    }

    /* ── History items ── */
    .csc-history-item {
        font-size: 3.2vw;
        padding: 2.5vw 3vw;
        flex-wrap: wrap;
        gap: 1vw;
    }

    /* ── Volume conversion items ── */
    .csc-volume-conversions {
        grid-template-columns: repeat(3, 1fr);
        gap: 2vw;
    }
    .csc-conv-val {
        font-size: 3.5vw;
    }
    .csc-conv-lbl {
        font-size: 2.5vw;
    }

    /* ── Material cards (standard mix) ── */
    .csc-material-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2vw;
    }
    .csc-mat-val {
        font-size: 3.8vw;
    }
    .csc-mat-lbl {
        font-size: 2.8vw;
    }
}