/* Buttons — sharp geometry, no rounding */
[class^="btn-"], [class*=" btn-"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.625rem 1.25rem;
    font-family: var(--font-technical);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.04rem;
    text-transform: uppercase;
    line-height: 1;
    border: 1px solid var(--on-surface);
    border-radius: 0;
    cursor: pointer;
    transition: background 0.1s ease;
    text-decoration: none;
}

[class^="btn-"]:hover, [class*=" btn-"]:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dim);
    color: var(--on-primary);
}

.btn-secondary {
    background: var(--surface);
    color: var(--on-surface);
    border: 2px solid var(--on-surface);
}

.btn-secondary:hover {
    background: var(--surface-container-high);
}

.btn-tertiary {
    background: var(--tertiary-container);
    color: var(--on-tertiary-container);
    border-color: var(--on-tertiary-container);
}

.btn-inverted {
    background: var(--on-surface);
    color: var(--surface);
    border-color: var(--on-surface);
}

.btn-outlined {
    background: transparent;
    color: var(--on-surface);
    border: 2px solid var(--on-surface);
}

.btn-outlined:hover {
    background: var(--surface-container-low);
}

.btn-danger {
    background: var(--error);
    color: var(--on-error);
    border-color: var(--error);
}

.btn-ghost {
    background: none;
    color: inherit;
    border: none;
    padding: 0.375rem 0.625rem;
    text-transform: none;
    letter-spacing: normal;
    font-family: var(--font-body);
}

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

.btn-danger {
    background: var(--tertiary);
    color: #fff;
    border-color: var(--tertiary);
}
.btn-danger:hover {
    background: #900007;
    border-color: #900007;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: var(--label-md);
}

.btn-full {
    width: 100%;
}

/* Cards — structural, no shadows */
.card {
    background: var(--surface-container-lowest);
    padding: var(--space-6);
    border: 2px solid var(--on-secondary-fixed);
    border-radius: 0;
}

/* Input fields — structural style */
.input-field {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-size: var(--body-lg);
    color: var(--on-surface);
    background: var(--surface-container-lowest);
    border: 1px solid var(--outline);
    border-radius: 0;
    outline: none;
    transition: border-color 0.15s ease;
}

.input-field:focus {
    border: 2px solid var(--primary);
    padding: calc(0.75rem - 1px) calc(1rem - 1px);
}

.input-field::placeholder {
    color: var(--outline);
}

.input-field-error {
    border: 2px solid var(--error);
}

.input-field-error ~ .input-helper {
    font-family: var(--font-technical);
    color: var(--error);
}

/* Form groups */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group .label-md {
    padding-left: var(--space-1);
}

/* Flash messages */
.flash-message {
    padding: var(--space-3) var(--space-5);
    border: 2px solid var(--outline);
    border-radius: 0;
    margin-bottom: var(--space-6);
    font-family: var(--font-technical);
    font-size: var(--body-md);
}

.flash-success {
    background: #d4edda;
    color: #155724;
    border-color: #155724;
}

.flash-error {
    background: var(--error-container);
    color: var(--on-error-container);
    border-color: var(--error);
}

/* Badges — sharp, high-chroma */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.625rem;
    font-family: var(--font-technical);
    font-size: var(--label-sm);
    font-weight: 600;
    letter-spacing: 0.06rem;
    border-radius: 0;
    text-transform: uppercase;
}

.badge-primary {
    background: var(--primary-container);
    color: var(--primary);
}

.badge-tertiary {
    background: var(--tertiary-container);
    color: var(--on-tertiary-container);
}

.badge-error {
    background: var(--error-container);
    color: var(--on-error-container);
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-outline {
    background: transparent;
    border: 1px solid var(--outline);
    color: var(--on-surface);
}

/* Flash message auto-dismiss */
.flash-message {
    transition: opacity 0.4s ease;
}

.flash-message--hiding {
    opacity: 0;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    pointer-events: none;
}

.toast-notif {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--surface-container-lowest);
    border: 2px solid var(--on-surface);
    box-shadow: 4px 4px 0 var(--on-surface);
    font-family: var(--font-technical);
    text-decoration: none;
    color: var(--on-surface);
    max-width: 360px;
    pointer-events: auto;
    cursor: pointer;
    transform: translateX(calc(100% + var(--space-4)));
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.toast-notif-visible {
    transform: translateX(0);
    opacity: 1;
}

.toast-notif-hiding {
    transform: translateX(calc(100% + var(--space-4)));
    opacity: 0;
}

.toast-notif:hover {
    background: var(--surface-container);
}

.toast-notif-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--primary);
}

.toast-notif-body {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.toast-notif-title {
    font-size: var(--body-md);
    font-weight: 600;
    line-height: 1.3;
}

.toast-notif-link {
    font-size: var(--label-sm);
    color: var(--primary);
}

/* Markdown editor */
.md-editor {
    position: relative;
}

.md-editor textarea.input-field {
    border-top: none;
}

.md-editor-toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    background: var(--surface-container-high);
    border: 1px solid var(--outline);
    border-bottom: none;
}

.md-editor-toolbar button {
    background: none;
    border: none;
    padding: 0.25rem 0.5rem;
    font-family: var(--font-technical);
    font-size: var(--label-md);
    font-weight: 600;
    color: var(--on-surface);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.04rem;
}

.md-editor-toolbar button:hover {
    background: var(--surface-container-lowest);
}

.md-editor-toolbar button.md-toolbar-active {
    background: var(--primary);
    color: var(--on-primary);
}

.md-editor-preview {
    padding: var(--space-4);
    min-height: 6rem;
    border: 1px solid var(--outline);
    border-top: none;
    background: var(--surface-container-lowest);
    overflow-y: auto;
}

/* Avatars */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 0;
    border: 1px solid var(--outline-variant);
    font-family: var(--font-display);
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    flex-shrink: 0;
    overflow: hidden;
    object-fit: cover;
}

.avatar-24 { font-size: 0.625rem; }
.avatar-32 { font-size: 0.75rem; }
.avatar-36 { font-size: 0.875rem; }
.avatar-48 { font-size: 1rem; }
.avatar-64 { font-size: 1.25rem; }
.avatar-96 { font-size: 1.75rem; }

img.avatar {
    border: 1px solid var(--outline-variant);
}