/* =========================================================
   NeoCalculator.net — Stair Calculator

   Page-specific styles only.

   Global theme + common calculator tab styles are reused
   from percent-calculator.css, exactly like the
   Number Sequence Calculator page.
   ========================================================= */


/* =========================================================
   IMPORTANT
   Reuse the SAME common calculator tab/panel styles
   used by Number Sequence Calculator.
   ========================================================= */

@import url('/css/percent-calculator-22ddf0d06da58bee5476ea4f3d55f776.css');


/* =========================================================
   MAIN CONTAINER
   ========================================================= */

.stair-container {

    padding-top: 30px;

    padding-bottom: 50px;

}


/* =========================================================
   HERO
   ========================================================= */

.stair-container .hero-section,
.stair-container .page-title,
.stair-container .page-subtitle {

    text-align: center;

}


.stair-container .page-subtitle {

    max-width: 850px;

    margin-left: auto;

    margin-right: auto;

}


/* =========================================================
   TABS
   IMPORTANT:
   Do NOT create a separate tab design here.

   The common .pct-nav-tabs / .pct-tab styling is inherited
   from percent-calculator.css so Stair Calculator tabs
   look exactly like Number Sequence Calculator tabs.
   ========================================================= */

.stair-tabs {

    flex-wrap: wrap;

}


/* =========================================================
   PANELS
   IMPORTANT:
   Do NOT override .pct-card-panel here.

   percent-calculator.css controls:
   - hidden inactive panels
   - visible active panel

   This makes only one Stair tab visible at a time.
   ========================================================= */

.stair-panel {

    width: 100%;

    box-sizing: border-box;

}


/* =========================================================
   FORM
   ========================================================= */

.stair-form-grid {

    display: flex;

    flex-direction: column;

    gap: 16px;

    background: var(--bg-input);

    padding: 20px;

    border-radius: var(--radius);

    border: 1px solid var(--border);

}


.stair-form-row {

    display: grid;

    grid-template-columns: 210px minmax(0, 1fr);

    align-items: center;

    gap: 14px;

}


.stair-form-row > label,
.stair-choice-row > label {

    font-weight: 600;

    font-size: 0.95rem;

    color: var(--text-dark);

}


.stair-choice-row {

    display: grid;

    grid-template-columns: 210px minmax(0, 1fr);

    gap: 14px;

    align-items: start;

}


/* =========================================================
   RADIO BUTTONS
   ========================================================= */

.stair-radio-group {

    display: flex;

    flex-wrap: wrap;

    gap: 18px;

}


.stair-radio-group label {

    display: flex;

    gap: 7px;

    align-items: center;

    font-weight: 600;

    color: var(--text-dark);

}


/* =========================================================
   INPUT + UNIT SELECT
   ========================================================= */

.stair-input-unit {

    display: grid;

    grid-template-columns: minmax(0, 1fr) 155px;

    gap: 10px;

    min-width: 0;

}


.stair-input,
.stair-select,
.stair-input-unit input,
.stair-input-unit select {

    width: 100%;

    min-width: 0;

    box-sizing: border-box;

    padding: 10px 12px;

    border-radius: var(--radius-sm);

    border: 1px solid var(--border);

    background: var(--bg-card);

    color: var(--text-dark);

    font-size: 1rem;

}


.stair-input:focus,
.stair-select:focus,
.stair-input-unit input:focus,
.stair-input-unit select:focus {

    outline: none;

    border-color: var(--primary);

    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.20);

}


/* =========================================================
   ACTION BUTTONS
   ========================================================= */

.stair-panel .pct-action-btns {

    display: flex;

    gap: 10px;

    flex-wrap: wrap;

    margin-top: 8px;

}


/* =========================================================
   SUB GRID
   ========================================================= */

.stair-subgrid {

    display: flex;

    flex-direction: column;

    gap: 14px;

    padding: 16px;

    border: 1px dashed var(--border);

    border-radius: var(--radius-sm);

    background: var(--bg-card);

}


/* =========================================================
   RESULTS
   ========================================================= */

.stair-result-summary {

    display: grid;

    grid-template-columns: repeat(4, minmax(0, 1fr));

    gap: 12px;

    margin-bottom: 16px;

}


.stair-result-card {

    background: var(--bg-card);

    border: 1px solid var(--border);

    border-radius: var(--radius-sm);

    padding: 14px;

}


.stair-result-card span {

    display: block;

    color: var(--text-muted);

    font-size: 0.82rem;

    margin-bottom: 5px;

}


.stair-result-card strong {

    color: var(--accent);

    font-size: 1.08rem;

}


/* =========================================================
   TABLE
   ========================================================= */

.stair-table-wrap {

    overflow-x: auto;

}


.stair-result-table {

    width: 100%;

    border-collapse: collapse;

    margin-top: 10px;

    min-width: 650px;

}


.stair-result-table th,
.stair-result-table td {

    padding: 10px 12px;

    border: 1px solid var(--border);

    text-align: left;

    font-size: 0.92rem;

}


.stair-result-table th {

    background: var(--bg-input);

    color: var(--text-dark);

    font-weight: 700;

}


/* =========================================================
   MESSAGES
   ========================================================= */

.stair-error {

    color: var(--danger);

    font-weight: 600;

    margin: 0;

}


.stair-note {

    color: var(--text-muted);

    margin-top: 14px;

    font-size: 0.9rem;

}


/* =========================================================
   STAIR GEOMETRY CARD
   ========================================================= */

.stair-visual-card {

    display: grid;

    grid-template-columns: 280px minmax(0, 1fr);

    gap: 28px;

    align-items: center;

    margin-top: 30px;

    padding: 24px;

    background: var(--bg-card);

    border: 1px solid var(--border);

    border-radius: var(--radius);

}


/* =========================================================
   VISIBLE STAIR DIAGRAM
   ========================================================= */

.stair-diagram {

    height: 180px;

    position: relative;

    overflow: hidden;

    background: var(--bg-input);

    border-radius: var(--radius-sm);

    display: flex;

    align-items: center;

    justify-content: center;

}


.stair-diagram-svg {

    width: 100%;

    height: 100%;

    display: block;

}


.stair-svg-steps {

    fill: none;

    stroke: var(--primary);

    stroke-width: 4;

    stroke-linejoin: round;

    stroke-linecap: square;

}


.stair-svg-stringer {

    fill: none;

    stroke: var(--accent);

    stroke-width: 3;

    stroke-linecap: round;

}


.stair-svg-rise,
.stair-svg-run {

    stroke: var(--text-muted);

    stroke-width: 2;

    stroke-dasharray: 4 3;

}


.stair-svg-label {

    fill: var(--text-muted);

    font-size: 12px;

    font-weight: 700;

    font-family: Arial, sans-serif;

}


/* =========================================================
   HOW TO USE / FAQ SPACING ONLY
   ========================================================= */

.stair-container .calculator-how-to,
.stair-container .faq-section {

    margin-top: 30px;

}


/* =========================================================
   RESPONSIVE — TABLET / MOBILE
   ========================================================= */

@media (max-width: 760px) {

    .stair-tabs {

        flex-direction: column;

        align-items: stretch;

        gap: 8px;

    }


    /*
     * Width only.
     * Visual tab styling still comes from
     * percent-calculator.css.
     */

    .stair-tabs .pct-tab {

        width: 100%;

    }


    .stair-form-row,
    .stair-choice-row {

        grid-template-columns: 1fr;

        gap: 6px;

    }


    .stair-input-unit {

        grid-template-columns: minmax(0, 1fr) 130px;

    }


    .stair-result-summary {

        grid-template-columns: 1fr 1fr;

    }


    .stair-visual-card {

        grid-template-columns: 1fr;

    }

}


/* =========================================================
   RESPONSIVE — SMALL MOBILE
   ========================================================= */

@media (max-width: 480px) {

    .stair-container {

        padding-top: 20px;

        padding-bottom: 35px;

    }


    .stair-form-grid {

        padding: 15px;

    }


    .stair-input-unit {

        grid-template-columns: 1fr;

    }


    .stair-panel .pct-action-btns {

        flex-direction: column;

    }


    .stair-panel .pct-action-btns .btn {

        width: 100%;

    }


    .stair-result-summary {

        grid-template-columns: 1fr;

    }


    .stair-result-table th,
    .stair-result-table td {

        padding: 8px 7px;

        font-size: 0.82rem;

    }


    .stair-visual-card {

        padding: 16px;

    }

}