:root {
    color-scheme: light dark;
    --color-primary: #6750a4;
    --color-on-primary: #ffffff;
    --color-primary-container: #eaddff;
    --color-on-primary-container: #21005d;
    --color-secondary: #625b71;
    --color-surface: #fef7ff;
    --color-surface-variant: #e7e0ec;
    --color-on-surface: #1d1b20;
    --color-outline: #79747e;
    --color-error: #b3261e;
    --color-on-error: #ffffff;
    --radius-large: 22px;
    --radius-medium: 18px;
    --shadow-soft: 0 8px 24px rgba(21, 14, 90, 0.12);
    --shadow-hard: 0 16px 32px rgba(21, 14, 90, 0.16);
    font-size: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #d0bcff;
        --color-on-primary: #381e72;
        --color-primary-container: #4f378a;
        --color-on-primary-container: #eaddff;
        --color-secondary: #cbc2db;
        --color-surface: #1d1b20;
        --color-surface-variant: #49454f;
        --color-on-surface: #e6e0e9;
        --color-outline: #938f99;
        --color-error: #f2b8b5;
        --color-on-error: #601410;
    }
}

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

body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, rgba(103, 80, 164, 0.12), transparent 60%),
        var(--color-surface);
    color: var(--color-on-surface);
    font-family: "Roboto", "Noto Sans SC", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(1rem, 5vw, 2rem) clamp(1rem, 6vw, 3rem);
    background: linear-gradient(135deg, rgba(103, 80, 164, 0.95), rgba(103, 80, 164, 0.75));
    color: var(--color-on-primary);
    box-shadow: var(--shadow-soft);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.25rem;
    height: 3.25rem;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.18);
    overflow: hidden;
}

.brand__icon {
    width: 100%;
    height: 100%;
}

.brand__text h1 {
    margin: 0;
    font-size: clamp(1.3rem, 3vw, 1.8rem);
}

.brand__text p {
    margin: 0.2rem 0 0;
    opacity: 0.9;
    font-size: 0.95rem;
}

.brand__link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1.1rem;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.12);
    color: inherit;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.2s ease, background 0.2s ease;
}

.brand__link:hover {
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.25);
}

.app-main {
    width: min(960px, 100%);
    margin: clamp(1.5rem, 4vw, 2.5rem) auto;
    padding: 0 clamp(1rem, 5vw, 2rem) clamp(2rem, 5vw, 3rem);
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 3vw, 1.75rem);
}

.card {
    background: color-mix(in srgb, var(--color-surface) 92%, rgba(255, 255, 255, 0.92));
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-soft);
    padding: clamp(1.25rem, 4vw, 2rem);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    backdrop-filter: blur(10px);
}

.hero__content h2 {
    margin: 0 0 0.3rem;
    font-size: clamp(1.25rem, 3vw, 1.8rem);
}

.hero__content p {
    margin: 0;
    color: color-mix(in srgb, var(--color-on-surface) 80%, transparent);
    line-height: 1.6;
}

code {
    font-family: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.85em;
    padding: 0.15rem 0.4rem;
    border-radius: 10px;
    background: color-mix(in srgb, var(--color-primary-container) 40%, transparent);
    color: var(--color-on-primary-container);
}

.hero__status {
    position: relative;
    min-height: 1px;
}

.toast-viewport {
    position: fixed;
    top: clamp(1rem, 4vw, 1.75rem);
    right: clamp(1rem, 4vw, 2.5rem);
    display: grid;
    gap: 0.75rem;
    width: min(380px, 90vw);
    z-index: 2000;
    pointer-events: none;
}

.toast {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    border-radius: var(--radius-medium);
    padding: 0.85rem 1.1rem;
    background: color-mix(in srgb, var(--color-surface) 88%, rgba(255, 255, 255, 0.95));
    color: var(--color-on-surface);
    box-shadow: var(--shadow-soft);
    border: 1px solid color-mix(in srgb, var(--color-primary) 12%, transparent);
    backdrop-filter: blur(6px);
    animation: toast-in 0.32s ease-out;
    pointer-events: auto;
}

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

.toast--error {
    border-color: color-mix(in srgb, var(--color-error) 45%, transparent);
}

.toast__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: color-mix(in srgb, currentColor 15%, transparent);
}

.toast__close {
    margin-left: auto;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 999px;
    transition: background 0.2s ease;
}

.toast__close:hover {
    background: color-mix(in srgb, currentColor 12%, transparent);
}

.toast__close:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px color-mix(in srgb, currentColor 25%, transparent);
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toast-out {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-6px);
    }
}

.form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form__section {
    border: none;
    padding: 0;
    margin: 0;
}

.form__section legend,
.form__section > summary {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 0.35rem;
    color: color-mix(in srgb, var(--color-on-surface) 86%, transparent);
}

.form__section > summary {
    list-style: none;
    cursor: pointer;
    padding: 0.75rem 1rem;
    border-radius: 14px;
    background: color-mix(in srgb, var(--color-primary-container) 24%, transparent);
    color: var(--color-on-primary-container);
    transition: background 0.2s ease;
}

.form__section > summary::marker,
.form__section > summary::-webkit-details-marker {
    display: none;
}

.form__section > summary:hover {
    background: color-mix(in srgb, var(--color-primary-container) 32%, transparent);
}

.form__section[open] > summary {
    margin-bottom: 1rem;
    background: color-mix(in srgb, var(--color-primary-container) 36%, transparent);
}

.form__section.form__section--optional {
    border-radius: 18px;
    background: color-mix(in srgb, var(--color-primary-container) 16%, transparent);
    padding: 0.35rem 0.75rem 0.75rem;
    border: 1px solid color-mix(in srgb, var(--color-primary) 18%, transparent);
    box-shadow: 0 10px 20px rgba(62, 45, 120, 0.08);
    position: relative;
    overflow: hidden;
}

.form__section.form__section--optional > summary {
    margin: 0.1rem 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.65rem 0.85rem;
    border-radius: 14px;
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: color-mix(in srgb, var(--color-on-primary-container) 94%, transparent);
    transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.form__section.form__section--optional[open] > summary {
    margin-bottom: 0.85rem;
    background: color-mix(in srgb, var(--color-primary) 22%, transparent);
    color: var(--color-on-primary);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.form__section-body {
    display: grid;
    gap: 1rem;
    padding: 0 0.4rem 0.25rem;
}

.form__section.form__section--optional .form__section-body {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: max-height 0.35s ease, opacity 0.25s ease, transform 0.3s ease;
}

.form__section.form__section--optional[open] .form__section-body {
    max-height: 420px;
    opacity: 1;
    transform: translateY(0);
}

.form__section.form__section--optional > summary::before {
    content: "";
    width: 1rem;
    height: 1rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-primary) 38%, transparent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 18%, transparent);
    transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.form__section.form__section--optional[open] > summary::before {
    transform: scale(1.15);
    background: color-mix(in srgb, var(--color-on-primary) 85%, transparent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.form__section.form__section--optional > summary::after {
    content: "▼";
    font-size: 0.9rem;
    opacity: 0.75;
    margin-left: auto;
    transition: transform 0.25s ease, color 0.25s ease;
    color: color-mix(in srgb, var(--color-on-primary-container) 80%, transparent);
}

.form__section.form__section--optional[open] > summary::after {
    transform: rotate(-180deg);
    opacity: 0.9;
    color: var(--color-on-primary);
}

@media (prefers-reduced-motion: reduce) {
    .form__section.form__section--optional .form__section-body,
    .form__section.form__section--optional > summary::after {
        transition: none;
    }
}

.field {
    display: grid;
    gap: 0.6rem;
}

.field label {
    font-weight: 500;
    font-size: 0.95rem;
    color: color-mix(in srgb, var(--color-on-surface) 94%, transparent);
}

input,
select,
textarea {
    font: inherit;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    border: 1px solid color-mix(in srgb, var(--color-outline) 60%, transparent);
    background: color-mix(in srgb, var(--color-surface) 95%, rgba(255, 255, 255, 0.9));
    color: var(--color-on-surface);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 25%, transparent);
}

.field__password {
    position: relative;
    display: flex;
    align-items: center;
}

.field__password input {
    width: 100%;
    padding-right: 3rem;
}

.password-toggle {
    position: absolute;
    top: 50%;
    right: 0.6rem;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.2rem;
    height: 2.2rem;
    border: none;
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-primary) 8%, transparent);
    color: var(--color-primary);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.password-toggle:hover {
    background: color-mix(in srgb, var(--color-primary) 16%, transparent);
}

.password-toggle[data-visible="true"] {
    background: color-mix(in srgb, var(--color-primary) 28%, transparent);
    color: var(--color-on-primary);
}

.password-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.password-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
    pointer-events: none;
}

.field__support {
    font-size: 0.85rem;
    color: color-mix(in srgb, var(--color-on-surface) 70%, transparent);
    margin: 0;
}

.field__description {
    font-size: 0.9rem;
    color: color-mix(in srgb, var(--color-secondary) 90%, transparent);
    margin: 0;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-medium);
    background: color-mix(in srgb, var(--color-primary-container) 26%, transparent);
    cursor: pointer;
    font-size: 0.95rem;
}

.toggle input {
    width: 1.25rem;
    height: 1.25rem;
    margin: 0;
    accent-color: var(--color-primary);
}

.form__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.button {
    border: none;
    border-radius: 999px;
    padding: 0.85rem 1.6rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
}

.button--primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: var(--shadow-soft);
}

.button--primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-hard);
}

.button--ghost {
    background: transparent;
    border: 1px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
    color: var(--color-primary);
}

.button--ghost:hover {
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
}

.button--tonal {
    background: var(--color-primary-container);
    color: var(--color-on-primary-container);
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
    box-shadow: none;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border-radius: 999px;
    padding: 0.45rem 0.85rem;
    font-size: 0.85rem;
    font-weight: 600;
    background: color-mix(in srgb, var(--color-primary) 18%, transparent);
    color: var(--color-primary);
}

.chip--info {
    background: color-mix(in srgb, var(--color-primary-container) 38%, transparent);
    color: var(--color-on-primary-container);
}

.chip--outline {
    border: 1px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
    background: transparent;
    color: var(--color-primary);
    padding: 0.45rem 1rem;
}

.result__header {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: space-between;
    align-items: center;
}

.result__header h2 {
    margin: 0;
    font-size: clamp(1.2rem, 3vw, 1.5rem);
}

.result__link {
    width: 100%;
    min-height: 5rem;
    resize: none;
    font-family: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95rem;
    border: 1px dashed color-mix(in srgb, var(--color-outline) 70%, transparent);
    background: color-mix(in srgb, var(--color-primary-container) 20%, transparent);
    padding: 1rem;
}

.result__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.result__tips {
    margin: 0;
    padding-left: 1.2rem;
    display: grid;
    gap: 0.4rem;
    color: color-mix(in srgb, var(--color-on-surface) 72%, transparent);
    font-size: 0.9rem;
}

.app-footer {
    margin-top: auto;
    padding: clamp(1.5rem, 4vw, 2.5rem);
    text-align: center;
    font-size: 0.85rem;
    color: color-mix(in srgb, var(--color-on-surface) 65%, transparent);
}

@media (max-width: 720px) {
    :root {
        font-size: 15px;
    }

    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .brand__link {
        align-self: stretch;
        justify-content: center;
    }

    .card {
        border-radius: 18px;
    }

    .form__actions,
    .result__actions {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }
}