/* ================================================================
   AIRFRAME UI — INPUT COMPONENT SYSTEM
   input.css · Atom layer

   Design: Airbnb UI Clone — exact vibe, spacing, radii, interactions
   ----------------------------------------------------------------
   HARD RULE: Zero hex, rgba(), or hsl() literals in this file.
   Every colour reference resolves through var(--color-*) tokens
   defined in colors.css. colors.css MUST be loaded before this file.
   ================================================================ */


/* ════════════════════════════════════════════════════════════════
   00. COMPONENT TOKENS
   Local custom properties that map system tokens → component roles.
════════════════════════════════════════════════════════════════ */
:root {
    /* Field surface */
    --input-bg: var(--color-surface);
    --input-bg-glass: var(--color-glass-bg);
    --input-text: var(--color-text-primary);
    --input-placeholder: var(--color-text-placeholder);

    /* Borders — Airbnb uses near-black on focus, not blue */
    --input-border: var(--color-border);
    --input-border-hover: var(--color-secondary);
    --input-border-focus: var(--color-border-focus);
    /* #1D1D1F — Airbnb trademark */

    /* Disabled */
    --input-disabled-bg: var(--color-surface-disabled);
    --input-disabled-text: var(--color-text-disabled);
    --input-disabled-border: var(--color-border-disabled);

    /* States */
    --input-error-border: var(--color-error);
    --input-error-ring: var(--color-error-bg);
    --input-success-border: var(--color-success);
    --input-success-ring: var(--color-success-bg);

    /* Focus rings — Airbnb uses dark ring for standard fields */
    --input-focus-ring: var(--focus-ring-dark);
    --input-focus-ring-red: var(--focus-ring);

    /* OTP accent */
    --otp-active-border: var(--color-primary);
    --otp-active-bg: var(--color-primary-alpha-sm);
    --otp-caret: var(--color-primary);

    /* Shadows */
    --input-shadow: var(--shadow-sm);
    --input-shadow-focus: var(--shadow-md);

    /* ── AIRBNB GEOMETRY ── */
    /* Airbnb uses large, very rounded corners throughout */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    /* base input — rounder than generic */
    --radius-lg: 16px;
    /* cards, panels */
    --radius-xl: 20px;
    /* modals, large cards */
    --radius-pill: 999px;

    /* Sizing — Airbnb fields are taller/more generous */
    --input-h-sm: 40px;
    --input-h-md: 48px;
    /* Airbnb's standard field height */
    --input-h-lg: 58px;

    /* Horizontal padding */
    --input-px-sm: 12px;
    --input-px-md: 16px;
    --input-px-lg: 20px;

    /* Typography */
    --input-fs-sm: 13px;
    --input-fs-md: 15px;
    --input-fs-lg: 16px;

    /* Airbnb border width — 1px default, 2px on focus/active (signature trait) */
    --input-bw: 1px;
    --input-bw-focus: 2px;

    /* Motion */
    --input-transition:
        border-color 160ms cubic-bezier(0.4, 0, 0.2, 1),
        border-width 160ms cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 160ms cubic-bezier(0.4, 0, 0.2, 1),
        background 160ms cubic-bezier(0.4, 0, 0.2, 1),
        opacity 160ms cubic-bezier(0.4, 0, 0.2, 1);
}


/* ════════════════════════════════════════════════════════════════
   01. FIELD WRAPPER
   .field — vertical stack: label → control → helper
════════════════════════════════════════════════════════════════ */
.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

/* Side-by-side layout */
.field-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.field-row .field {
    flex: 1;
    min-width: 200px;
}


/* ════════════════════════════════════════════════════════════════
   02. LABEL
   Airbnb: medium weight, slightly larger, generous spacing
════════════════════════════════════════════════════════════════ */
.field-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -.01em;
    line-height: 1.4;
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

.field-label .required {
    color: var(--color-primary);
    margin-left: 3px;
}


/* ════════════════════════════════════════════════════════════════
   03. HELPER / ERROR / SUCCESS TEXT
════════════════════════════════════════════════════════════════ */
.field-helper {
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

.field-helper.is-error {
    color: var(--color-error-text);
}

.field-helper.is-success {
    color: var(--color-success-text);
}

.field-helper.is-warn {
    color: var(--color-warning-text);
}


/* ════════════════════════════════════════════════════════════════
   04. BASE INPUT — .input
   Airbnb signature: tall, generous padding, large radius,
   near-black 2px border on focus, no blue focus ring.
════════════════════════════════════════════════════════════════ */
.input {
    display: block;
    width: 100%;
    height: var(--input-h-md);
    padding: 0 var(--input-px-md);

    font-size: var(--input-fs-md);
    font-family: inherit;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -.01em;
    color: var(--input-text);
    -webkit-font-smoothing: antialiased;

    background: var(--input-bg);
    border: var(--input-bw) solid var(--input-border);
    border-radius: var(--radius-md);
    outline: none;
    box-shadow: var(--shadow-sm);

    transition: var(--input-transition);
    -webkit-appearance: none;
    appearance: none;
}

.input::placeholder {
    color: var(--input-placeholder);
    font-weight: 400;
    opacity: 1;
}

/* Hover — border darkens noticeably */
.input:hover:not(:disabled):not(.is-error):not(.is-success) {
    border-color: var(--input-border-hover);
    box-shadow: var(--shadow-md);
}

/* Focus — 2px near-black border, Airbnb's signature */
.input:focus:not(.is-error):not(.is-success) {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-md);
    background: var(--color-surface);
}

/* Disabled */
.input:disabled {
    background: var(--input-disabled-bg);
    color: var(--input-disabled-text);
    border-color: var(--input-disabled-border);
    box-shadow: none;
    cursor: not-allowed;
    opacity: .6;
}

/* Error */
.input.is-error {
    border-width: var(--input-bw-focus);
    border-color: var(--input-error-border);
    box-shadow: 0 0 0 3px var(--input-error-ring);
}

.input.is-error:focus {
    border-color: var(--input-error-border);
    box-shadow: 0 0 0 3px var(--input-error-ring);
}

/* Success */
.input.is-success {
    border-width: var(--input-bw-focus);
    border-color: var(--input-success-border);
    box-shadow: 0 0 0 3px var(--input-success-ring);
}

/* Remove browser spinners */
.input[type="number"]::-webkit-inner-spin-button,
.input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.input[type="number"] {
    -moz-appearance: textfield;
}

/* Date / time */
.input[type="date"],
.input[type="time"],
.input[type="datetime-local"],
.input[type="month"],
.input[type="week"] {
    color-scheme: light dark;
}


/* ════════════════════════════════════════════════════════════════
   05. SIZE MODIFIERS
════════════════════════════════════════════════════════════════ */
.input-sm {
    height: var(--input-h-sm);
    padding: 0 var(--input-px-sm);
    font-size: var(--input-fs-sm);
    border-radius: var(--radius-sm);
}

/* .input = md (default) */

.input-lg {
    height: var(--input-h-lg);
    padding: 0 var(--input-px-lg);
    font-size: var(--input-fs-lg);
    border-radius: var(--radius-lg);
}


/* ════════════════════════════════════════════════════════════════
   06. ICON WRAP — .input-wrap
════════════════════════════════════════════════════════════════ */
.input-wrap {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.input-wrap .input {
    padding-left: 44px;
}

.input-wrap.icon-sm .input {
    padding-left: 36px;
}

.input-wrap.icon-lg .input {
    padding-left: 52px;
}

.input-wrap.icon-right .input {
    padding-left: var(--input-px-md);
    padding-right: 44px;
}

.input-wrap.icon-both .input {
    padding-left: 44px;
    padding-right: 44px;
}

.input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 160ms ease;
}

.input-wrap.icon-right .input-icon,
.input-wrap .input-icon-right {
    left: auto;
    right: 14px;
}

.input-wrap:focus-within .input-icon {
    color: var(--color-text-secondary);
}


/* ════════════════════════════════════════════════════════════════
   07. SEARCH INPUT
   Airbnb search: pill, strong shadow, prominent on hover
════════════════════════════════════════════════════════════════ */
.input-search {
    border-radius: var(--radius-pill);
    padding-left: 44px;
    height: var(--input-h-md);
    background: var(--color-surface);
    border: var(--input-bw) solid var(--color-border);
    box-shadow: var(--shadow-md);
}

.input-search:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-dark);
}

.input-search:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-lg);
}


/* ════════════════════════════════════════════════════════════════
   08. PASSWORD TOGGLE — .pw-toggle
════════════════════════════════════════════════════════════════ */
.pw-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background 120ms ease, color 120ms ease;
    -webkit-font-smoothing: antialiased;
}

.pw-toggle:hover {
    background: var(--color-ghost-hover-bg);
    color: var(--color-text-primary);
}

.pw-toggle:active {
    background: var(--color-ghost-pressed-bg);
}


/* ════════════════════════════════════════════════════════════════
   09. TEXTAREA — .textarea
════════════════════════════════════════════════════════════════ */
.textarea {
    display: block;
    width: 100%;
    min-height: 120px;
    padding: 14px var(--input-px-md);
    font-size: var(--input-fs-md);
    font-family: inherit;
    font-weight: 400;
    line-height: 1.65;
    letter-spacing: -.01em;
    color: var(--input-text);
    background: var(--input-bg);
    border: var(--input-bw) solid var(--input-border);
    border-radius: var(--radius-md);
    outline: none;
    resize: vertical;
    box-shadow: var(--shadow-sm);
    -webkit-font-smoothing: antialiased;
    transition: var(--input-transition);
}

.textarea::placeholder {
    color: var(--input-placeholder);
    opacity: 1;
}

.textarea:hover:not(:disabled) {
    border-color: var(--input-border-hover);
    box-shadow: var(--shadow-md);
}

.textarea:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-md);
}

.textarea:disabled {
    background: var(--input-disabled-bg);
    color: var(--input-disabled-text);
    border-color: var(--input-disabled-border);
    box-shadow: none;
    cursor: not-allowed;
    opacity: .6;
    resize: none;
}

.textarea.is-error {
    border-width: var(--input-bw-focus);
    border-color: var(--input-error-border);
    box-shadow: 0 0 0 3px var(--input-error-ring);
}

.textarea.is-success {
    border-width: var(--input-bw-focus);
    border-color: var(--input-success-border);
    box-shadow: 0 0 0 3px var(--input-success-ring);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.textarea-count {
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: right;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

.textarea-count.is-near {
    color: var(--color-warning-text);
}

.textarea-count.is-max {
    color: var(--color-error-text);
}


/* ════════════════════════════════════════════════════════════════
   10. NUMBER STEPPER — .number-wrap
════════════════════════════════════════════════════════════════ */
.number-wrap {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.number-wrap .input {
    padding-right: 50px;
}

.number-stepper {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--color-border-light);
    overflow: hidden;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.stepper-btn {
    flex: 1;
    width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background 100ms ease, color 100ms ease;
}

.stepper-btn:first-child {
    border-bottom: 1px solid var(--color-border-light);
}

.stepper-btn:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.stepper-btn:active {
    background: var(--color-surface-inset);
}


/* ════════════════════════════════════════════════════════════════
   11. PHONE COMPOUND — .phone-wrap + .country-select
════════════════════════════════════════════════════════════════ */
.phone-wrap {
    display: flex;
    width: 100%;
}

.country-select {
    height: var(--input-h-md);
    padding: 0 28px 0 16px;
    font-size: 14px;
    font-family: inherit;
    font-weight: 500;
    color: var(--input-text);
    background-color: var(--color-bg-secondary);
    border: var(--input-bw) solid var(--input-border);
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    outline: none;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236E6E73' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 10px 6px;
    transition: var(--input-transition);
}

.country-select:hover {
    border-color: var(--input-border-hover);
}

.country-select:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    z-index: 1;
}

.phone-wrap .input {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}


/* ════════════════════════════════════════════════════════════════
   12. SELECT — .select-wrap + .select-native
════════════════════════════════════════════════════════════════ */
.select-wrap {
    position: relative;
    width: 100%;
}

.select-native {
    height: var(--input-h-md);
    padding: 0 44px 0 var(--input-px-md);
    font-size: var(--input-fs-md);
    font-family: inherit;
    font-weight: 400;
    color: var(--input-text);
    background: var(--input-bg);
    border: var(--input-bw) solid var(--input-border);
    border-radius: var(--radius-md);
    outline: none;
    width: 100%;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    box-shadow: var(--shadow-sm);
    transition: var(--input-transition);
}

.select-native:hover:not(:disabled) {
    border-color: var(--input-border-hover);
    box-shadow: var(--shadow-md);
}

.select-native:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-md);
}

.select-native:disabled {
    opacity: .6;
    cursor: not-allowed;
    box-shadow: none;
}

.select-caret {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.select-wrap:focus-within .select-caret {
    transform: translateY(-50%) rotate(180deg);
}


/* ════════════════════════════════════════════════════════════════
   13. RANGE SLIDER
   Airbnb: coral fill, white thumb with coral border
════════════════════════════════════════════════════════════════ */
.range-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
}

.range-val {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    min-width: 56px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    flex-shrink: 0;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    background: linear-gradient(to right,
            var(--color-primary) 0%,
            var(--color-primary) var(--pct, 0%),
            var(--color-border) var(--pct, 0%),
            var(--color-border) 100%);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-md);
    cursor: grab;
    transition: transform 120ms ease, box-shadow 120ms ease;
}

input[type="range"]::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-md);
    cursor: grab;
}

input[type="range"]:focus {
    outline: none;
}


/* ════════════════════════════════════════════════════════════════
   14. OTP / PIN — .otp-wrap + .otp-input
════════════════════════════════════════════════════════════════ */
.otp-wrap {
    display: flex;
    gap: 10px;
    align-items: center;
}

.otp-sep {
    font-size: 20px;
    font-weight: 300;
    color: var(--color-text-muted);
    padding: 0 4px;
    line-height: 1;
    user-select: none;
}

.otp-input {
    width: 52px;
    height: 60px;
    font-size: 24px;
    font-weight: 700;
    font-family: inherit;
    text-align: center;
    letter-spacing: 0;
    color: var(--color-text-primary);
    background: var(--color-surface);
    border: var(--input-bw) solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    caret-color: var(--otp-caret);
    box-shadow: var(--shadow-sm);
    -webkit-font-smoothing: antialiased;
    transition:
        border-color 160ms ease,
        border-width 160ms ease,
        box-shadow 160ms ease,
        transform 120ms cubic-bezier(0.34, 1.56, 0.64, 1),
        background 160ms ease;
}

.otp-input:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--otp-active-border);
    box-shadow: var(--shadow-md);
    transform: scale(1.07);
    background: var(--otp-active-bg);
}

.otp-input.is-filled {
    border-width: var(--input-bw-focus);
    border-color: var(--otp-active-border);
    background: var(--otp-active-bg);
    color: var(--color-primary);
}

.otp-input.is-error {
    border-width: var(--input-bw-focus);
    border-color: var(--input-error-border);
    box-shadow: 0 0 0 3px var(--input-error-ring);
}

.otp-input-lg {
    width: 64px;
    height: 72px;
    font-size: 30px;
    border-radius: var(--radius-lg);
}

.otp-input-sm {
    width: 44px;
    height: 52px;
    font-size: 20px;
    border-radius: var(--radius-sm);
}


/* ════════════════════════════════════════════════════════════════
   15. CHECKBOX — .checkbox-wrap
   Airbnb: coral checked state, smooth animation
════════════════════════════════════════════════════════════════ */
.checkbox-wrap {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.checkbox-wrap input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: var(--input-bw) solid var(--input-border);
    border-radius: 6px;
    background: var(--input-bg);
    cursor: pointer;
    position: relative;
    margin-top: 1px;
    transition: border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
    outline: none;
    box-shadow: var(--shadow-sm);
}

.checkbox-wrap input[type="checkbox"]:hover {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
}

.checkbox-wrap input[type="checkbox"]:focus-visible {
    box-shadow: var(--input-focus-ring-red);
}

.checkbox-wrap input[type="checkbox"]:checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: none;
}

.checkbox-wrap input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 6px;
    width: 5px;
    height: 10px;
    border: 2px solid var(--color-text-inverse);
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

.checkbox-wrap input[type="checkbox"]:indeterminate {
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: none;
}

.checkbox-wrap input[type="checkbox"]:indeterminate::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 4px;
    right: 4px;
    height: 2px;
    background: var(--color-text-inverse);
    transform: translateY(-50%);
    border: none;
}

.checkbox-label {
    font-size: 15px;
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.5;
}

.checkbox-sub {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 2px;
}


/* ════════════════════════════════════════════════════════════════
   16. RADIO — .radio-wrap
════════════════════════════════════════════════════════════════ */
.radio-wrap {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.radio-wrap input[type="radio"] {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: var(--input-bw) solid var(--input-border);
    border-radius: 50%;
    background: var(--input-bg);
    cursor: pointer;
    position: relative;
    margin-top: 1px;
    outline: none;
    box-shadow: var(--shadow-sm);
    transition: border-color 140ms ease, background 140ms ease, box-shadow 140ms ease;
}

.radio-wrap input[type="radio"]:hover {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
}

.radio-wrap input[type="radio"]:focus-visible {
    box-shadow: var(--input-focus-ring-red);
}

.radio-wrap input[type="radio"]:checked {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    background: var(--color-surface);
    box-shadow: none;
}

.radio-wrap input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    right: 3px;
    bottom: 3px;
    border-radius: 50%;
    background: var(--color-primary);
}

.radio-label {
    font-size: 15px;
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.5;
}

.radio-sub {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 2px;
}


/* ════════════════════════════════════════════════════════════════
   17. GLASSMORPHISM SET — .glass-* variants
════════════════════════════════════════════════════════════════ */
.glass-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.glass-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

.input-glass {
    display: block;
    width: 100%;
    height: var(--input-h-lg);
    padding: 0 var(--input-px-lg);
    font-size: var(--input-fs-lg);
    font-family: inherit;
    font-weight: 400;
    letter-spacing: -.01em;
    color: var(--color-text-primary);
    background: var(--color-glass-bg);
    border: var(--input-bw) solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    outline: none;
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    box-shadow:
        0 1px 0 var(--color-glass-border) inset,
        0 0 0 1px var(--color-glass-border),
        var(--shadow-lg);
    transition:
        border-color 180ms ease,
        box-shadow 180ms ease,
        background 180ms ease;
    -webkit-font-smoothing: antialiased;
}

.input-glass::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

.input-glass:hover:not(:disabled) {
    border-color: var(--color-separator);
    box-shadow:
        0 1px 0 var(--color-glass-border) inset,
        0 0 0 1px var(--color-separator),
        var(--shadow-lg);
}

.input-glass:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 1px 0 var(--color-glass-border) inset,
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-lg);
}

.input-glass:disabled {
    opacity: .45;
    cursor: not-allowed;
}

.textarea-glass {
    display: block;
    width: 100%;
    min-height: 120px;
    padding: 16px var(--input-px-lg);
    font-size: var(--input-fs-md);
    font-family: inherit;
    line-height: 1.65;
    letter-spacing: -.01em;
    color: var(--color-text-primary);
    background: var(--color-glass-bg);
    border: var(--input-bw) solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    outline: none;
    resize: vertical;
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    box-shadow:
        0 1px 0 var(--color-glass-border) inset,
        var(--shadow-md);
    transition: border-color 180ms ease, box-shadow 180ms ease;
    -webkit-font-smoothing: antialiased;
}

.textarea-glass::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

.textarea-glass:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 1px 0 var(--color-glass-border) inset,
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-lg);
}

.select-glass {
    height: var(--input-h-lg);
    padding: 0 44px 0 var(--input-px-lg);
    font-size: var(--input-fs-md);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-glass-bg);
    border: var(--input-bw) solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    outline: none;
    width: 100%;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: var(--shadow-md);
    transition: border-color 180ms ease, box-shadow 180ms ease;
}

.select-glass:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-lg);
}

.otp-glass .otp-input {
    background: var(--color-glass-bg);
    border-color: var(--color-glass-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
}

.otp-glass .otp-input:focus {
    background: var(--color-glass-tint);
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-lg);
}

.otp-glass .otp-input.is-filled {
    background: var(--color-glass-tint);
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
}

.input-glass-search {
    border-radius: var(--radius-pill);
    padding-left: 48px;
    height: var(--input-h-md);
    font-size: var(--input-fs-md);
    background: var(--color-glass-bg);
    border: var(--input-bw) solid var(--color-glass-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
}

.input-glass-search:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-md);
}

.input-glass-tinted {
    background: var(--color-glass-tint);
    border-color: var(--color-primary-border);
}

.input-glass-tinted:focus {
    background: var(--color-glass-tint);
    border-width: var(--input-bw-focus);
    border-color: var(--color-primary);
    box-shadow:
        0 0 0 1px var(--color-primary),
        var(--focus-ring),
        var(--shadow-lg);
}

.glass-panel {
    background: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-xl);
    padding: 36px;
    backdrop-filter: saturate(180%) blur(32px);
    -webkit-backdrop-filter: saturate(180%) blur(32px);
    box-shadow:
        0 2px 0 var(--color-glass-border) inset,
        var(--shadow-xl);
}

.glass-panel-sm {
    padding: 24px 28px;
    border-radius: var(--radius-lg);
}


/* ════════════════════════════════════════════════════════════════
   18. FLOATING LABEL — .float-field
   Airbnb's signature pattern: label lifts up inside the tall field.
   Coral label colour on focus is the Airbnb trademark.
════════════════════════════════════════════════════════════════ */
.float-field {
    position: relative;
    width: 100%;
}

.float-input {
    height: 64px;
    /* Airbnb float fields are extra tall */
    padding: 24px var(--input-px-md) 10px;
    font-size: var(--input-fs-md);
    font-family: inherit;
    font-weight: 400;
    color: var(--input-text);
    background: var(--input-bg);
    border: var(--input-bw) solid var(--input-border);
    border-radius: var(--radius-md);
    outline: none;
    width: 100%;
    box-shadow: var(--shadow-sm);
    transition: var(--input-transition);
    -webkit-font-smoothing: antialiased;
}

.float-input::placeholder {
    opacity: 0;
}

.float-input:hover:not(:disabled) {
    border-color: var(--input-border-hover);
    box-shadow: var(--shadow-md);
}

.float-input:focus {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-md);
}

.float-label {
    position: absolute;
    left: var(--input-px-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--input-fs-md);
    font-weight: 400;
    color: var(--input-placeholder);
    pointer-events: none;
    transform-origin: left top;
    transition:
        top 180ms cubic-bezier(0.4, 0, 0.2, 1),
        transform 180ms cubic-bezier(0.4, 0, 0.2, 1),
        font-size 180ms cubic-bezier(0.4, 0, 0.2, 1),
        color 180ms cubic-bezier(0.4, 0, 0.2, 1),
        font-weight 180ms cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-font-smoothing: antialiased;
}

/* Floated state */
.float-input:focus~.float-label,
.float-input:not(:placeholder-shown)~.float-label {
    top: 14px;
    transform: translateY(0) scale(0.75);
    font-size: var(--input-fs-md);
    font-weight: 700;
    color: var(--color-text-secondary);
    letter-spacing: .01em;
}

/* Coral on focus — Airbnb's most recognisable input detail */
.float-input:focus~.float-label {
    color: var(--color-primary);
}


/* ════════════════════════════════════════════════════════════════
   19. INPUT GROUP — prefix / suffix addons
════════════════════════════════════════════════════════════════ */
.input-group {
    display: flex;
    width: 100%;
    align-items: stretch;
}

.input-addon {
    display: flex;
    align-items: center;
    padding: 0 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: var(--input-bw) solid var(--input-border);
    white-space: nowrap;
    flex-shrink: 0;
}

.input-addon:first-child {
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.input-addon:last-child {
    border-left: none;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.input-group .input {
    border-radius: 0;
    flex: 1;
}

.input-group .input:focus {
    position: relative;
    z-index: 1;
}

.input-group .input-addon:first-child+.input {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.input-group .input+.input-addon:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}


/* ════════════════════════════════════════════════════════════════
   20. TAG INPUT — .tag-input-wrap
════════════════════════════════════════════════════════════════ */
.tag-input-wrap {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    min-height: var(--input-h-md);
    padding: 8px 12px;
    background: var(--input-bg);
    border: var(--input-bw) solid var(--input-border);
    border-radius: var(--radius-md);
    cursor: text;
    box-shadow: var(--shadow-sm);
    transition: var(--input-transition);
}

.tag-input-wrap:focus-within {
    border-width: var(--input-bw-focus);
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-md);
}

.tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-alpha);
    border: 1px solid var(--color-primary-border);
    border-radius: var(--radius-pill);
}

.tag-pill-remove {
    display: flex;
    align-items: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-primary);
    padding: 0;
    line-height: 1;
    opacity: .7;
    transition: opacity 100ms ease;
}

.tag-pill-remove:hover {
    opacity: 1;
}

.tag-input-inner {
    flex: 1;
    min-width: 80px;
    font-size: 14px;
    font-family: inherit;
    color: var(--input-text);
    background: none;
    border: none;
    outline: none;
}

.tag-input-inner::placeholder {
    color: var(--input-placeholder);
}


/* ════════════════════════════════════════════════════════════════
   21. LOADING SHIMMER
════════════════════════════════════════════════════════════════ */
.input-loading {
    position: relative;
    overflow: hidden;
    pointer-events: none;
}

.input-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
            transparent 0%,
            var(--color-fill-primary) 50%,
            transparent 100%);
    animation: shimmer 1.4s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}


/* ════════════════════════════════════════════════════════════════
   22. RESPONSIVE
════════════════════════════════════════════════════════════════ */
@media (max-width: 480px) {
    .otp-input {
        width: 44px;
        height: 52px;
        font-size: 20px;
    }

    .otp-input-lg {
        width: 54px;
        height: 62px;
        font-size: 24px;
    }

    .field-row {
        flex-direction: column;
    }

    .phone-wrap {
        flex-direction: column;
    }

    .phone-wrap .country-select {
        border-right: 1px solid var(--input-border);
        border-bottom: none;
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        width: 100%;
    }

    .phone-wrap .input {
        border-radius: 0 0 var(--radius-md) var(--radius-md);
    }
}