*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #4f8ff7;
    --color-primary-dark: #3a7ae0;
    --color-primary-glow: rgba(79, 143, 247, 0.12);
    --color-success: #3fb573;
    --color-danger: #e55b5b;
    --color-warning: #e5a03b;
    --color-bg: #0a0a0c;
    --color-surface: #141418;
    --color-elevated: #1c1c22;
    --color-surface-hover: #1e1e24;
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1a9;
    --color-text-muted: #6b6b73;
    --color-border: #232329;
    --color-border-subtle: #1c1c22;
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --transition: 150ms ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.55;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 1.5rem;
    height: 52px;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

header nav {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}

.btn-logout {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.btn-logout:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
    background: var(--color-elevated);
}

.logo {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.logo:hover {
    color: var(--color-primary);
}

main {
    flex: 1;
    padding: 2.5rem 1.25rem;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
}

.container--wide {
    max-width: 960px;
}

footer {
    text-align: center;
    padding: 1.25rem;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 0.35rem;
    font-weight: 600;
    letter-spacing: -0.025em;
    color: var(--color-text);
    line-height: 1.3;
}

h2 {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.subtitle {
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.hint {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    font-weight: normal;
}

.form-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--color-text);
    font-size: 0.85rem;
}

input[type="text"],
input[type="url"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.55rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), opacity var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    line-height: 1.5;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
}

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

.btn-primary:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-elevated);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.error-text {
    color: var(--color-danger);
    font-size: 0.85rem;
    margin-top: 0.4rem;
}

.flash-messages {
    max-width: 720px;
    margin: 0 auto 1rem;
}

.flash {
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.flash-error {
    background: rgba(229, 91, 91, 0.08);
    color: #f08080;
    border: 1px solid rgba(229, 91, 91, 0.2);
}

.flash-success {
    background: rgba(63, 181, 115, 0.08);
    color: #6dd89e;
    border: 1px solid rgba(63, 181, 115, 0.2);
}

.form-actions {
    text-align: center;
    margin-top: 1.5rem;
}

.status-text {
    display: inline-block;
    margin-left: 0.75rem;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

::selection {
    background: var(--color-primary);
    color: #fff;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #3a3a3e;
}

/* Responsive */
@media (max-width: 640px) {
    main {
        padding: 1.25rem 0.75rem;
    }

    h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.85rem;
        margin-bottom: 1.25rem;
    }

    .form-section {
        padding: 0.9rem;
        border-radius: var(--radius);
    }

    .form-group label {
        font-size: 0.8rem;
    }

    input[type="text"],
    input[type="url"],
    textarea,
    select {
        font-size: 16px; /* prevents iOS zoom on focus */
        padding: 0.55rem 0.6rem;
    }

    .btn-primary {
        width: 100%;
        padding: 0.65rem 1rem;
    }

    .form-actions {
        margin-top: 1rem;
    }

    .status-text {
        display: block;
        margin-left: 0;
        margin-top: 0.5rem;
        text-align: center;
    }

    header {
        padding: 0 0.75rem;
        height: 46px;
    }

    .logo {
        font-size: 0.85rem;
    }

    footer {
        padding: 1rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 400px) {
    main {
        padding: 1rem 0.5rem;
    }

    .form-section {
        padding: 0.75rem;
    }

    h1 {
        font-size: 1.1rem;
    }
}