@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url('/static/fonts/Inter.woff2') format('woff2-variations'),
         url('/static/fonts/Inter.woff2') format('woff2');
}

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

html,
body {
    height: 100%;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    height: 100dvh;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-feature-settings: 'cv11', 'ss01', 'ss03';
    font-size: clamp(0.9rem, 0.85rem + 0.2vw, 1rem);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

button,
input,
textarea {
    font: inherit;
    color: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

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

[hidden] {
    display: none !important;
}

:root {
    --bg: #ffffff;
    --surface: #fafafa;
    --surface-2: #f5f5f5;
    --border: #e5e5e5;
    --border-strong: #d4d4d4;
    --text: #0a0a0a;
    --muted: #737373;
    --accent: #3b82f6;
    --accent-contrast: #ffffff;
    --danger: #dc2626;
    --success: #16a34a;
    --radius: 8px;
    --radius-sm: 6px;
    --ring: 0 0 0 3px rgba(59, 130, 246, 0.18);
}

:root[data-theme='dark'] {
    --bg: #0a0a0a;
    --surface: #111111;
    --surface-2: #161616;
    --border: #262626;
    --border-strong: #333333;
    --text: #ededed;
    --muted: #a3a3a3;
    --accent: #3b82f6;
    --accent-contrast: #ffffff;
    --danger: #f87171;
    --success: #4ade80;
    --ring: 0 0 0 3px rgba(59, 130, 246, 0.28);
}

.topbar {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px clamp(14px, 4vw, 24px);
    padding-top: max(10px, env(safe-area-inset-top));
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text);
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
}

.brand-name {
    font-size: 0.9375rem;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.icon-btn:hover {
    background: var(--surface-2);
    border-color: var(--border-strong);
}

.icon-btn:focus-visible {
    outline: none;
    box-shadow: var(--ring);
    border-color: var(--accent);
}

:root[data-theme='dark'] .icon-sun,
:root:not([data-theme='dark']) .icon-moon {
    display: none;
}

.main {
    flex: 1 1 0;
    min-height: 0;
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    padding: clamp(12px, 3vh, 28px) clamp(14px, 4vw, 24px);
    padding-bottom: max(clamp(12px, 3vh, 28px), env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: clamp(14px, 2.5vh, 22px) clamp(16px, 4vw, 24px);
    display: flex;
    flex-direction: column;
    gap: clamp(10px, 1.6vh, 16px);
    max-height: 100%;
    min-height: 0;
    overflow: hidden;
}

.card-head {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.card-title {
    margin: 0;
    font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.25rem);
    letter-spacing: -0.02em;
    font-weight: 600;
    line-height: 1.2;
}

.card-sub {
    margin: 0;
    color: var(--muted);
    font-size: 0.8125rem;
    line-height: 1.4;
}

.form {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: clamp(8px, 1.2vh, 12px);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
    font-size: 0.78125rem;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -0.005em;
}

.label-aux {
    font-weight: 400;
    color: var(--muted);
    font-size: 0.72rem;
}

.input {
    width: 100%;
    height: clamp(34px, 4.6vh, 38px);
    padding: 0 12px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    /* Must stay >= 16px. iOS Safari auto-zooms into form fields whose
       computed font-size is below 16px on focus, and modern iOS (>=17, and
       definitively iOS 26) has disabled every JavaScript path for restoring
       the zoom on blur (viewport-meta swaps, focus decoys, scroll resets
       are all ignored). Preventing the zoom-in is the only reliable fix. */
    font-size: 16px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    appearance: none;
}

.input::placeholder {
    color: var(--muted);
    opacity: 0.7;
}

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

.input:focus,
.input:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--ring);
}

.input[type='number']::-webkit-outer-spin-button,
.input[type='number']::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: clamp(34px, 4.6vh, 40px);
    padding: 0 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, opacity 0.15s ease;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--ring);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
    width: 100%;
    margin-top: 2px;
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.9;
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

.btn-ghost:hover {
    background: var(--surface-2);
    border-color: var(--border-strong);
}

.toast {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.78125rem;
    line-height: 1.4;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
}

.toast::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--muted);
    margin-top: 6px;
    flex-shrink: 0;
}

.toast.is-loading::before {
    background: var(--accent);
    animation: pulse 1.2s ease-in-out infinite;
}

.toast.is-success {
    border-color: color-mix(in srgb, var(--success) 35%, var(--border));
}

.toast.is-success::before {
    background: var(--success);
}

.toast.is-error {
    border-color: color-mix(in srgb, var(--danger) 35%, var(--border));
}

.toast.is-error::before {
    background: var(--danger);
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

.result {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    overflow: hidden;
}

.result-frame {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.qr {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

.result-actions {
    flex-shrink: 0;
    display: flex;
    justify-content: center;
}

@media (max-width: 480px) {
    .topbar {
        padding-left: 12px;
        padding-right: 12px;
    }

    .main {
        padding-left: 12px;
        padding-right: 12px;
    }

    .card {
        border-radius: 10px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}