/*
 * Registration page styles: layout, cards, header, intro and form fields.
 * Class names follow a simple block__element convention.
 */

:root {
    --color-page: #fff1e4;
    --color-surface: #ffffff;
    --color-text: #2b2118;
    --color-text-muted: #5c4e43;
    --color-border: #e5d3c3;
    --color-border-strong: #b9a493;
    --color-accent: #f58220;
    --color-action: #b84e08;
    --color-action-hover: #9c4106;
    --color-focus: #8a3a00;
    --color-error: #b3261e;
    --color-error-surface: #fdf1f0;
    --color-selected-surface: #fff4e8;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;

    --radius: 0.75rem;
    --content-width: 40rem;
    --control-height: 3rem;

    /* System fonts only: no external requests. Sans-serif throughout; serif
       Devanagari fonts such as Mangal are deliberately not listed.
       Latin text uses --font-body; Nepali (lang="ne") uses --font-nepali,
       which puts Devanagari sans fonts first: Noto Sans Devanagari
       (Android/Linux/ChromeOS), Nirmala UI (Windows), Kohinoor Devanagari /
       Devanagari Sangam MN (Apple), Mukta. */
    --font-body: "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans",
        "Noto Sans Devanagari", "Nirmala UI", "Kohinoor Devanagari",
        "Devanagari Sangam MN", system-ui, sans-serif;
    --font-nepali: "Noto Sans Devanagari", "Nirmala UI", "Kohinoor Devanagari",
        "Devanagari Sangam MN", Mukta, "Segoe UI", Roboto, Arial, system-ui,
        sans-serif;

    --line-height-body: 1.65;
    --line-height-nepali: 1.8; /* Devanagari matras above/below need room */
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--color-page);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: var(--line-height-body);
    overflow-wrap: break-word;
    font-synthesis: none; /* never fake bold/italic glyphs */
    text-rendering: optimizeLegibility;
}

/* Nepali text: Devanagari-first sans stack, taller lines, and no letter
   spacing (it would break up conjuncts and matras). */
:lang(ne) {
    font-family: var(--font-nepali);
    letter-spacing: 0;
}

/* Layout ------------------------------------------------------------------ */

.page {
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-5) var(--space-4) var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-5);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.required-mark {
    color: var(--color-error);
    font-weight: 700;
}

/* Logo header ------------------------------------------------------------- */

.logo-header {
    display: flex;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
}

.logo-header__logo {
    display: block;
    width: 11rem;
    max-width: 100%;
    height: 9.5rem;
    /* The logo file has generous white margins; crop them visually only. */
    object-fit: cover;
    object-position: 50% 46%;
}

/* Form introduction -------------------------------------------------------- */

.form-intro {
    border-top: 0.5rem solid var(--color-accent);
}

.form-intro p {
    margin: 0 0 var(--space-4);
    text-align: left;
    text-wrap: pretty; /* avoids a lone word on the last line where supported */
}

.form-intro__title {
    margin: 0 0 var(--space-4);
    font-weight: 700;
    line-height: 1.45;
    text-wrap: balance;
}

.form-intro__title-ne {
    display: block;
    font-size: clamp(1.625rem, 1.3rem + 1.5vw, 2rem);
    line-height: 1.5;
}

.form-intro__title-en {
    display: block;
    margin-top: var(--space-1);
    font-size: clamp(1rem, 0.95rem + 0.4vw, 1.1875rem);
    font-weight: 500;
    color: var(--color-text-muted);
}

.form-intro__welcome {
    margin-bottom: var(--space-3);
    font-size: clamp(1.125rem, 1.05rem + 0.4vw, 1.25rem);
    font-weight: 700;
    line-height: 1.7;
}

.form-intro__text {
    color: var(--color-text);
    line-height: var(--line-height-nepali);
}

.form-intro .form-intro__required-note {
    margin: var(--space-4) 0 0;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* Form --------------------------------------------------------------------- */

.registration-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.field__label {
    display: block;
    margin-bottom: var(--space-3);
    padding: 0;
    font-weight: 600;
}

.field__input {
    display: block;
    width: 100%;
    min-height: var(--control-height);
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border-strong);
    border-radius: 0.5rem;
    background: var(--color-surface);
    color: var(--color-text);
    font: inherit;
}

.field__group {
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
}

.field__group > .field__label {
    float: left; /* keeps <legend> in normal flow across browsers */
    width: 100%;
}

.field__group > .choice:first-of-type {
    clear: both;
}

.choice {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-height: var(--control-height);
    margin-top: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    cursor: pointer;
}

.choice__input {
    flex: none;
    width: 1.25rem;
    height: 1.25rem;
    margin: 0;
    accent-color: var(--color-action);
}

.choice:has(.choice__input:checked) {
    border-color: var(--color-action);
    background: var(--color-selected-surface);
}

.choice:has(.choice__input:focus-visible) {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.field__input:focus-visible,
.button:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

/* Validation state: set by registration-form.js and rendered by the server */

.field__error {
    margin: var(--space-2) 0 0;
    color: var(--color-error);
    font-size: 0.9375rem;
    font-weight: 500;
}

.field__error[hidden] {
    display: none;
}

.field__input[aria-invalid="true"] {
    border-color: var(--color-error);
    background: var(--color-error-surface);
}

.field--invalid {
    border-color: var(--color-error);
}

/* Phone field: fixed Nepal prefix and number as one control ------------------ */

.phone-input {
    display: flex;
    align-items: stretch;
    min-height: var(--control-height);
    border: 1px solid var(--color-border-strong);
    border-radius: 0.5rem;
    background: var(--color-surface);
}

.phone-input:focus-within {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.field--invalid .phone-input {
    border-color: var(--color-error);
    background: var(--color-error-surface);
}

.phone-input__prefix {
    flex: none; /* only as wide as its content (flag and code); the number box takes the rest */
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-3);
    border-right: 1px solid var(--color-border);
    border-radius: 0.5rem 0 0 0.5rem;
    background: var(--color-selected-surface);
    color: var(--color-text);
    white-space: nowrap;
}

.phone-input__number {
    flex: 1 1 auto;
    min-width: 0; /* lets the box shrink on narrow screens instead of overflowing */
    padding: var(--space-2) var(--space-3);
    border: 0;
    border-radius: 0 0.5rem 0.5rem 0;
    background: transparent;
    color: var(--color-text);
    font: inherit;
}

.phone-input__number:focus {
    outline: none; /* the whole control shows the focus ring (.phone-input:focus-within) */
}

.phone-input__flag {
    flex: none;
    display: block;
    width: 1.5rem;
    height: auto;
    aspect-ratio: 4 / 3; /* the flag file is 4:3; never stretched or cropped */
    object-fit: contain;
    filter: drop-shadow(0 0 1px rgba(43, 33, 24, 0.45)); /* follows the flag's own outline */
}

.phone-input__code {
    font-weight: 600;
}

/* Success message ---------------------------------------------------------- */

.registration-success:focus {
    outline: none; /* focused programmatically only; the card is not interactive */
}

.registration-success .form-intro__title {
    line-height: 1.5;
}

/* Actions and status ------------------------------------------------------- */

.form-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.button {
    width: 100%;
    min-height: 3.25rem;
    padding: var(--space-3) var(--space-5);
    border: 0;
    border-radius: 0.5rem;
    background: var(--color-action);
    color: #ffffff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.button:hover {
    background: var(--color-action-hover);
}

.form-status {
    margin: 0;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    background: var(--color-surface);
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

.form-status:empty {
    display: none;
}

.form-status--error {
    border-color: var(--color-error);
    background: var(--color-error-surface);
    color: var(--color-error);
}

/* Small screens: slightly smaller type, and a narrower phone prefix -------- */

@media (max-width: 29.99em) { /* below 480px; desktop and tablets are unchanged */
    body {
        font-size: 0.9375rem;
    }

    .page {
        padding-right: var(--space-3);
        padding-left: var(--space-3);
    }

    .form-intro__title-ne {
        font-size: 1.5rem;
    }

    .form-intro__title-en {
        font-size: 0.9375rem;
    }

    .form-intro__welcome {
        font-size: 1.0625rem;
    }

    .form-intro .form-intro__required-note,
    .field__error,
    .form-status {
        font-size: 0.875rem;
    }

    .field__label {
        font-size: 0.9375rem; /* still heavier (600) than the 15px input text, so labels stay distinct */
    }

    .field__input,
    .phone-input__prefix,
    .phone-input__number {
        font-size: 0.9375rem;
    }

    .choice {
        font-size: 0.9375rem;
    }

    .button {
        font-size: 0.9375rem;
    }

    /* Nepal prefix: flag + code, no more than that. */
    .phone-input__prefix {
        gap: 0.375rem;
        padding: 0 var(--space-2);
    }

    .phone-input__flag {
        width: 1.375rem;
    }

    .phone-input__number {
        padding: var(--space-2) var(--space-2);
    }

    .phone-input__number::placeholder {
        font-size: 0.875rem;
    }
}

/* Wider screens ------------------------------------------------------------ */

@media (min-width: 40em) {
    .page {
        padding-top: var(--space-6);
    }

    .card {
        padding: var(--space-6);
    }

    .logo-header {
        padding: var(--space-4);
    }

    .button {
        width: auto;
        align-self: flex-start;
        min-width: 16rem;
    }
}