/* ================================================================
   CSS Custom Properties (Design Tokens)
   ================================================================ */
:root {
    /* Colors */
    --color-bg:               #F5F7FA;
    --color-border:           #D1D5DB;
    --color-accent-soft:      #E8F3EE;
    --color-accent-primary:   #2706A0;
    --color-accent-primary-h: #1e0580; /* hover */
    --color-text-primary:     #111827;
    --color-accent-secondary: #0F5132;
    --color-success:          #16A34A;
    --color-text-secondary:   #4B5563;
    --color-accent-hover:     #0B3D26;
    --color-white:            #ffffff;

    /* Typography */
    --font-heading: 'IBM Plex Serif', Georgia, serif;
    --font-body:    'IBM Plex Sans', Arial, sans-serif;

    /* Container */
    --container-max:     1280px;
    --container-padding: 40px;

    /* Misc */
    --radius-lg:    12px;
    --transition:   0.25s ease;
    --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
    --shadow-md:    0 4px 16px rgba(0,0,0,.10);
}

/* ================================================================
   Reset / Base
   ================================================================ */
*,
*::before,
*::after { font-family: var(--font-body); box-sizing: border-box; margin: 0; padding: 0; border: none; appearance: none; background-color: none; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: #F5F7FA;
    -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; transition: color var(--transition); }

ul, ol { list-style: none; }

address { font-style: normal; }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text-primary);
}

/* ================================================================
   Container
   ================================================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

@media (max-width: 1240px) {
    .container { padding-inline: 20px; }
}

@media (max-width: 768px) {
    .container { padding-inline: 10px; }
}

/* ================================================================
   Buttons
   ================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 500;
    line-height: 20px;
    border: 2px solid transparent;
    cursor: pointer;
    height: 51px;
    padding: 0 17px;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn--primary {
    background-color: var(--color-accent-primary);
    color: var(--color-white);
    border-color: var(--color-accent-primary);
}

.btn--primary:hover,
.btn--primary:focus-visible {
    background-color: var(--color-accent-primary-h);
    border-color: var(--color-accent-primary-h);
    color: var(--color-white);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
}

.btn--outline-white {
    color: var(--color-white);
}

.btn--outline:hover,
.btn--outline:focus-visible {
    background-color: var(--color-accent-primary);
    color: var(--color-white);
}

.btn--full { width: 100%; }

/* ================================================================
   Form elements
   ================================================================ */
.form-input {
    width: 100%;
    font-family: var(--font-body);
    font-size: 12px;
    color: var(--color-text-primary);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input::placeholder { color: var(--color-text-secondary); }

.form-input:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(39, 6, 160, .12);
}

/* ================================================================
   Form status message
   ================================================================ */
.callback-form__status {
    font-size: 13px;
    margin-top: 8px;
    min-height: 18px;
}
.callback-form__status.is-success { color: var(--color-success); }
.callback-form__status.is-error   { color: #dc2626; }

/* ================================================================
   Reusable Form Components
   ================================================================ */

/* --- Form label --- */
.form-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #5A5A5A;
    margin-bottom: 10px;
}

/* --- Form field wrapper --- */
.form-field {
    display: flex;
    flex-direction: column;
}

/* --- Underline input (line style) --- */
.form-input--line {
    border: none;
    border-bottom: 1.5px solid var(--color-accent-secondary);
    border-radius: 0;
    padding: 10.5px 0;
    background: transparent;
    box-shadow: none;
}

.form-input--line::placeholder { color: var(--color-text-secondary); }

.form-input--line:focus {
    border-bottom-color: var(--color-accent-secondary);
    box-shadow: none;
    outline: none;
}

/* --- Textarea --- */
.form-textarea {
    resize: vertical;
    min-height: 86px;
    font-size: 12px;
    line-height: 16px;
    border: 1px solid #1A1A1A;
    padding: 12px;
}

.form-textarea:focus {
    border-color: var(--color-accent-secondary);
    box-shadow: 0 0 0 3px rgba(15, 81, 50, .10);
    outline: none;
}

/* --- Custom checkbox --- */
.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    cursor: pointer;
}

/* Скрываем нативный чекбокс */
.form-checkbox input[type="checkbox"] {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

/* Кастомный квадрат */
.form-checkbox__box {
    flex-shrink: 0;
    width: 24px;
    height: 24px;   
    border: 0.25px solid #111827;
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition), background-color var(--transition);
}

.form-checkbox__box svg {
    display: none;
    flex-shrink: 0;
}

/* Отмечен */
.form-checkbox input[type="checkbox"]:checked + .form-checkbox__box {
    border-color: #2706A0;
    background: var(--color-white);
}

.form-checkbox input[type="checkbox"]:checked + .form-checkbox__box svg {
    display: block;
}

/* Фокус */
.form-checkbox input[type="checkbox"]:focus-visible + .form-checkbox__box {
    outline: 2px solid #2706A0;
    outline-offset: 2px;
}

.form-checkbox__label {
    font-size: 12px;
    color: #5A5A5A;
    line-height: 1.5;
    cursor: pointer;
}

.form-checkbox__label a {
    color: var(--color-accent-secondary);
    text-decoration: underline;
}

/* --- Button size modifier --- */
.btn--lg {
    padding: 16px 24px;
    font-size: 16px;
}

/* ================================================================
   Simple callback footer form
   ================================================================ */
.callback-form { display: flex; flex-direction: column; gap: 12px; }

/* ================================================================
   Request Modal "Запросить расчёт"
   ================================================================ */
.request-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.request-modal[hidden] { display: none; }

.request-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, .5);
    backdrop-filter: blur(3px);
}

.request-modal__box {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 590px;
    max-height: calc(100vh - 32px);
    display: flex;
    flex-direction: column;
    background: var(--color-white);
    box-shadow: 0 8px 40px rgba(0,0,0,.18);
    overflow: hidden;
}

/* Modal header — dark green */
.request-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--color-accent-secondary);
    padding: 24px 28px;
    flex-shrink: 0;
}

.request-modal__title {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-white);
    margin: 0;
}

.request-modal__close {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-white);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    opacity: .85;
    transition: opacity var(--transition);
    flex-shrink: 0;
}
.request-modal__close:hover { opacity: 1; }

/* Modal body — scrollable */
.request-modal__body {
    padding: 28px 32px 32px;
    overflow-y: auto;
    flex: 1;
}

/* "Оставить заявку" heading — mobile only */
.request-modal__mobile-heading {
    display: none;
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.request-modal__desc {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

/* 2-column grid */
.request-form__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 32px;
    row-gap: 20px;
    margin-bottom: 20px;
}

.request-form > .form-field { margin-bottom: 20px; }

.request-form .form-checkbox { margin-bottom: 24px; }

/* ================================================================
   Responsive — Request Modal
   ================================================================ */
@media (max-width: 640px) {
    .btn {
        height: 48px;
    }

    .request-modal { padding: 0; align-items: flex-end; }

    .request-modal__box {
        max-width: 100%;
        max-height: 95dvh;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .request-modal__header { padding: 20px 20px; }
    .request-modal__title  { font-size: 20px; }

    .request-modal__body { padding: 20px 20px 28px; }

    .request-modal__mobile-heading { display: block; }

    /* single column on mobile */
    .request-form__grid {
        grid-template-columns: 1fr;
        row-gap: 16px;
    }

    /* labels — normal case on mobile */
    .request-modal__body .form-label {
        text-transform: none;
        font-size: 14px;
        font-weight: 400;
        letter-spacing: 0;
    }
}