@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root {
    color-scheme: dark light;
    --font-sans: "Plus Jakarta Sans", sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    --shell-max: 60rem;
    --shell-error-max: 57.5rem;
    --radius-panel: 1.5rem;
    --radius-box: 1rem;
    --radius-small: 0.625rem;
    --gap-panel: 1.5rem;
    --gap-stack: 1rem;
    --bg: #151d2f;
    --surface: #1a2236;
    --surface-muted: #202a40;
    --text: #e7edf8;
    --heading: #ffffff;
    --muted: #95a2bb;
    --border: #34415b;
    --accent: #c7d6f5;
    --accent-strong: #8fa6d6;
    --danger: #ff8f89;
    --danger-soft: rgba(255, 143, 137, 0.12);
    --danger-border: rgba(255, 143, 137, 0.28);
    --accent-soft: rgba(199, 214, 245, 0.12);
    --accent-border: rgba(199, 214, 245, 0.24);
    --focus-ring: rgba(199, 214, 245, 0.18);
    --shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
    --button-fill: #c7d6f5;
    --button-fill-hover: #8fa6d6;
    --button-text: #101b31;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f8f9fb;
        --surface: #ffffff;
        --surface-muted: #f3f6fa;
        --text: #192847;
        --heading: #222326;
        --muted: #7f8aa3;
        --border: #e3e6ec;
        --accent: #192847;
        --accent-strong: #101b31;
        --danger: #b42318;
        --danger-soft: rgba(180, 35, 24, 0.06);
        --danger-border: rgba(180, 35, 24, 0.16);
        --accent-soft: rgba(25, 40, 71, 0.05);
        --accent-border: rgba(25, 40, 71, 0.12);
        --focus-ring: rgba(25, 40, 71, 0.12);
        --shadow: 0 14px 32px rgba(25, 40, 71, 0.06);
        --button-fill: #192847;
        --button-fill-hover: #101b31;
        --button-text: #ffffff;
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    background: var(--bg);
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    font-family: var(--font-sans);
}

a {
    color: var(--accent-strong);
}

a:hover {
    color: var(--accent);
}

:is(p, ul, ol) {
    margin: 0;
    line-height: 1.6;
}

:is(h1, h2, h3) {
    margin: 0;
    color: var(--heading);
    line-height: 1.1;
}

h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

hr {
    width: 100%;
    margin: 0.125rem 0;
    border: 0;
    border-top: 1px solid var(--border);
}

code {
    font-family: var(--font-mono);
}

:where(.page-header, .content-stack, .message-stack, form, .center-message, .diagnostic-panel, .diagnostic-row) {
    display: grid;
}

:where(.content-stack, .message-stack, form) {
    gap: var(--gap-stack);
}

.page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(1.5rem, 5vw, 3.5rem) 1.25rem;
}

.shell {
    width: min(var(--shell-max), 100%);
}

.page-body--error .shell {
    width: min(var(--shell-error-max), 100%);
}

.panel {
    display: grid;
    gap: var(--gap-panel);
    padding: clamp(1.5rem, 4vw, 2rem);
    border: 1px solid var(--border);
    border-radius: var(--radius-panel);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1.125rem;
}

:is(.logo-wrap, input[type="text"], input[type="password"], .center-message, .email-preview, .diagnostic-panel, .debug-table) {
    border: 1px solid var(--border);
    border-radius: var(--radius-box);
    background: var(--surface-muted);
}

.logo-wrap {
    display: grid;
    place-items: center;
    padding: 0.75rem;
}

.logo {
    display: block;
    width: auto;
    height: 3rem;
    border-radius: var(--radius-small);
}

.diagnostic-row span,
.status-line {
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.diagnostic-row span {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--muted);
}

.brand-title {
    color: var(--heading);
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    font-weight: 700;
}

.page-header {
    gap: 0.625rem;
}

.page-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.page-subtitle,
.password-strength {
    color: var(--muted);
}

.page-subtitle {
    max-width: 42rem;
}

.message-stack > :empty,
:is(.error, .info, .mode-banner):empty {
    display: none;
}

label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--heading);
}

input[type="text"],
input[type="password"] {
    width: 100%;
    min-width: 0;
    padding: 0.875rem 1rem;
    color: var(--text);
    font: inherit;
}

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

input:focus {
    outline: none;
    border-color: var(--accent-strong);
    box-shadow: 0 0 0 0.25rem var(--focus-ring);
}

input[readonly],
#pw-strength,
.info,
.mode-banner,
.brand-title,
.diagnostic-row code {
    color: var(--heading);
}

.password-row,
.error-actions {
    display: flex;
}

.password-row {
    align-items: stretch;
    gap: 0.625rem;
}

.password-row input {
    flex: 1;
}

.error-actions {
    flex-wrap: wrap;
    gap: 0.75rem;
}

:is(button, .button-link) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    padding: 0 1.25rem;
    border: 1px solid transparent;
    border-radius: 999rem;
    background: var(--button-fill);
    color: var(--button-text);
    font: inherit;
    font-weight: 700;
    letter-spacing: 0.01em;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

:is(button, .button-link):hover {
    background: var(--button-fill-hover);
    color: var(--button-text);
    transform: translateY(-1px);
}

:is(button, .button-link):focus-visible {
    outline: none;
    box-shadow: 0 0 0 0.25rem var(--focus-ring);
}

:is(button, .button-link):active {
    transform: translateY(0);
}

button:disabled {
    background: var(--surface-muted);
    border-color: var(--border);
    color: var(--muted);
    cursor: not-allowed;
    transform: none;
}

:is(.toggle-password, .button-link--secondary) {
    background: transparent;
    border-color: var(--border);
    color: var(--heading);
}

:is(.toggle-password, .button-link--secondary):hover {
    background: var(--surface-muted);
    color: var(--heading);
}

.password-strength {
    font-weight: 600;
}

:is(.error, .info, .mode-banner) {
    padding: 0.875rem 1rem;
}

:is(.error, .info, .mode-banner) > * {
    margin: 0;
}

.error {
    border: 1px solid var(--danger-border);
    border-radius: var(--radius-box);
    background: var(--danger-soft);
    color: var(--danger);
}

.info {
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-box);
    background: var(--accent-soft);
}

.mode-banner {
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-box);
    background: var(--surface-muted);
}

.center-message {
    gap: 0.875rem;
    justify-items: center;
    padding: 1.5rem;
    text-align: center;
}

.center-message p {
    max-width: 36rem;
}

.email-preview {
    padding: 1.125rem;
}

.email-preview pre {
    margin: 0;
    color: var(--text);
    white-space: pre-wrap;
    font: inherit;
    line-height: 1.6;
}

.debug-table {
    width: 100%;
    border-spacing: 0;
    overflow: hidden;
}

.debug-table :is(th, td) {
    padding: 0.75rem 0.875rem;
    text-align: left;
    vertical-align: top;
}

.debug-table th {
    width: 34%;
    color: var(--heading);
    font-weight: 700;
}

.debug-table tr + tr :is(th, td) {
    border-top: 1px solid var(--border);
}

.status-line {
    margin: 0 0 0.875rem;
    color: var(--danger);
    font-size: 0.82rem;
    font-weight: 800;
}

.diagnostic-panel {
    gap: 0.75rem;
    padding: 1.125rem 1.25rem;
}

.diagnostic-row {
    gap: 0.375rem;
}

.diagnostic-row code {
    font-size: 0.95rem;
    word-break: break-word;
}

@media (max-width: 40rem) {
    .panel {
        gap: 1.25rem;
        padding: 1.5rem 1.25rem;
    }

    .brand {
        align-items: flex-start;
    }

    .page-title {
        font-size: clamp(1.8rem, 10vw, 2.3rem);
    }

    :is(.password-row, .error-actions) {
        flex-direction: column;
    }

    :is(.toggle-password, .error-actions .button-link, form button) {
        width: 100%;
    }
}