:root {
    --bg: #f2f7ff;
    --surface: #ffffff;
    --border: #d5e4fb;
    --primary: #1f5ea8;
    --primary-strong: #174b85;
    --text: #1f2d3d;
    --muted: #5f7085;
    --bubble-own: #d9eafe;
    --bubble-other: #f4f8ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, #a9c7ef 0%, #bfd5f3 55%, #d7e5f8 100%);
    min-height: 100vh;
}

.messagerie-header {
    background: linear-gradient(180deg, #1f5ea8, #4d97e2);
    color: #fff;
    padding: 1.4rem 1rem 1.8rem;
    height: 220px;
    box-sizing: border-box;
    position: relative;
    border-radius: 0 0 24px 24px;
    box-shadow: 0 8px 20px rgba(17, 52, 97, 0.22);
}

.header-nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 1rem;
}

.header-left-links {
    display: inline-flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.55rem;
    width: max-content;
    margin-left: calc(150px - (50vw - 50%));
}

.header-left-top,
.header-left-bottom {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.header-left-bottom {
    width: 100%;
}

.header-left-bottom .home-btn {
    flex: 1 1 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.header-main {
    max-width: 1200px;
    margin: 0 auto;
}

.header-title-stack {
    position: absolute;
    top: 50%;
    right: 200px;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    text-align: center;
}

.header-title-stack .nav-links {
    justify-content: center;
    margin-bottom: 0.35rem;
}

.home-btn,
.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    height: 38px;
    min-height: 38px;
    padding: 0 1.2rem;
    font-size: 1rem;
    line-height: 1.1;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    box-sizing: border-box;
    transition: 0.2s ease;
}

.home-btn:hover,
.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.28);
    transform: translateY(-1px);
}

.header-title-stack .nav-link {
    font-weight: 600;
}

.header-left-links .home-btn {
    font-weight: 500;
}

.messagerie-header .header-left-links > .a11y-toggle-btn {
    width: 100%;
    box-sizing: border-box;
    margin: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.14);
    height: 38px;
    min-height: 38px;
    padding: 0 1.2rem;
    font-size: 1rem;
    line-height: 1.1;
    border-radius: 999px;
    transition: 0.2s ease;
}

.messagerie-header .header-left-links > .a11y-toggle-btn:hover,
.messagerie-header .header-left-links > .a11y-toggle-btn:focus-visible {
    background: rgba(255, 255, 255, 0.28);
    transform: translateY(-1px);
    outline: none;
}

.messagerie-header h1 {
    margin: 0 0 0.35rem;
    text-align: center;
    font-size: clamp(1.9rem, 4vw, 2.7rem);
    line-height: 1.15;
}

.messagerie-header p {
    margin: 0;
    text-align: center;
    opacity: 0.95;
}

.messagerie-main {
    max-width: 1200px;
    margin: 1.4rem auto;
    padding: 0 1rem 1.2rem;
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 1rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 6px 18px rgba(17, 52, 97, 0.08);
}

.conversations-panel {
    padding: 1rem;
}

.conversations-panel h2,
.thread-header h2 {
    margin: 0;
    font-size: 1.1rem;
}

.notifications-toolbar {
    margin: 0.75rem 0 0.65rem;
}

.notifications-btn {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #f7fbff;
    color: #234064;
    font: inherit;
    font-weight: 700;
    padding: 0.56rem 0.7rem;
    cursor: pointer;
}

.notifications-btn:hover {
    background: #eaf4ff;
}

.notifications-panel {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fbfdff;
    padding: 0.6rem;
    margin-bottom: 0.9rem;
}

.notifications-panel-header h3 {
    margin: 0;
    font-size: 0.95rem;
    color: var(--muted);
}

.notifications-list {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    max-height: 230px;
    overflow: auto;
}

.notification-item {
    display: flex;
    flex-direction: column;
    gap: 0.18rem;
    border: 1px solid #dce9fb;
    border-radius: 9px;
    background: #ffffff;
    text-decoration: none;
    color: inherit;
    padding: 0.55rem 0.62rem;
}

.notification-item:hover {
    background: #eef6ff;
    border-color: #bed7f7;
}

.notification-item-title {
    font-size: 0.9rem;
    color: #19365d;
}

.notification-item-meta {
    font-size: 0.8rem;
    color: var(--muted);
}

.new-conversation-form {
    margin: 0.9rem 0 1rem;
}

.new-conversation-form label {
    display: block;
    font-size: 0.92rem;
    color: var(--muted);
    margin-bottom: 0.35rem;
}

.new-conversation-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
}

.new-conversation-row select,
.new-conversation-row button,
.message-form textarea,
.message-form button {
    border-radius: 10px;
    border: 1px solid var(--border);
    font: inherit;
}

.new-conversation-row select,
.message-form textarea {
    padding: 0.58rem 0.7rem;
    background: #fff;
}

.new-conversation-row button,
.message-form button {
    padding: 0.58rem 0.85rem;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    border-color: var(--primary);
}

.new-conversation-row button:hover,
.message-form button:hover {
    background: var(--primary-strong);
    border-color: var(--primary-strong);
}

.new-conversation-row button:disabled,
.message-form button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.conversations-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 62vh;
    overflow: auto;
    padding-right: 0.1rem;
}

.conversation-item {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.6rem;
    background: #f8fbff;
    cursor: pointer;
    text-align: left;
}

.conversation-item.active {
    border-color: #7fb1ef;
    background: #e8f3ff;
}

.conversation-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.2rem;
}

.conversation-name {
    font-weight: 700;
}

.conversation-date {
    font-size: 0.78rem;
    color: var(--muted);
}

.conversation-preview {
    margin: 0;
    color: #2e3d51;
    font-size: 0.9rem;
}

.conversation-unread {
    display: inline-flex;
    min-width: 1.2rem;
    height: 1.2rem;
    border-radius: 999px;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: #fff;
    background: #e11d48;
}

.thread-panel {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 72vh;
}

.thread-header {
    border-bottom: 1px solid var(--border);
    padding: 1rem;
}

.thread-header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.8rem;
}

#threadMeta {
    margin: 0.25rem 0 0;
    color: var(--muted);
}

.admin-btn {
    border: 1px solid #d63b5f;
    border-radius: 10px;
    background: #ffe8ee;
    color: #92152f;
    font-weight: 700;
    padding: 0.45rem 0.7rem;
    cursor: pointer;
}

.admin-btn:hover {
    background: #ffd6e1;
}

.thread-messages {
    padding: 1rem;
    overflow: auto;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.message-row {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    max-width: 78%;
}

.message-row.own {
    align-self: flex-end;
}

.message-row.other {
    align-self: flex-start;
}

.message-bubble {
    border-radius: 12px;
    padding: 0.6rem 0.72rem;
    line-height: 1.45;
    word-break: break-word;
}

.message-row.own .message-bubble {
    background: var(--bubble-own);
    border: 1px solid #b5d6ff;
}

.message-row.other .message-bubble {
    background: var(--bubble-other);
    border: 1px solid #deebfd;
}

.message-meta {
    font-size: 0.75rem;
    color: var(--muted);
}

.message-actions {
    display: flex;
    justify-content: flex-end;
}

.report-btn {
    border: 1px solid #f5b03b;
    border-radius: 8px;
    background: #fff4de;
    color: #8a5b00;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.24rem 0.5rem;
    cursor: pointer;
}

.report-btn:hover {
    background: #ffebc0;
}

.message-form {
    border-top: 1px solid var(--border);
    padding: 0.8rem 1rem;
    background: #fafdff;
}

.message-form textarea {
    width: 100%;
    min-height: 84px;
    resize: vertical;
}

.message-form-footer {
    margin-top: 0.45rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
}

#messageCount {
    color: var(--muted);
    font-size: 0.88rem;
}

.empty-state {
    margin: 1rem 0 0;
    color: var(--muted);
}

.thread-empty {
    margin: auto;
    color: var(--muted);
    text-align: center;
}

.admin-moderation {
    max-width: 1200px;
    margin: 0 auto 1.2rem;
    padding: 1rem;
}

.messagerie-footer {
    margin-top: 1.2rem;
    text-align: center;
    color: #ffffff;
    padding: 0.7rem 1rem;
    background: linear-gradient(135deg, #1f5ea8, #2f7ed1);
    border-top: 1px solid rgba(255, 255, 255, 0.35);
}

.messagerie-footer p {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
}

.admin-moderation-header h2 {
    margin: 0;
    font-size: 1.05rem;
}

.admin-moderation-header p {
    margin: 0.2rem 0 0.8rem;
    color: var(--muted);
}

.reports-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.7rem;
}

.report-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #f8fbff;
    padding: 0.65rem;
}

.report-card h3 {
    margin: 0 0 0.3rem;
    font-size: 0.95rem;
}

.report-card p {
    margin: 0.25rem 0;
    font-size: 0.88rem;
}

.report-card-actions {
    display: flex;
    gap: 0.45rem;
    margin-top: 0.55rem;
}

.report-card-actions button {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
    padding: 0.35rem 0.55rem;
    font-size: 0.78rem;
    cursor: pointer;
}

.report-card-actions button:hover {
    background: #f2f6ff;
}

@media (max-width: 980px) {
    .messagerie-header {
        height: auto;
        min-height: 220px;
    }

    .header-nav {
        flex-direction: column;
        gap: 0.6rem;
    }

    .header-left-links {
        margin-left: 0;
        width: 100%;
        align-items: center;
        justify-content: center;
    }

    .header-left-top,
    .header-left-bottom {
        justify-content: center;
        flex-wrap: wrap;
    }

    .messagerie-header .header-left-links > .a11y-toggle-btn {
        width: auto;
    }

    .header-title-stack {
        position: static;
        transform: none;
        gap: 0.3rem;
    }

    .header-title-stack .nav-links {
        justify-content: center;
        flex-wrap: wrap;
        margin-bottom: 0.15rem;
    }

    .messagerie-main {
        grid-template-columns: 1fr;
    }

    .thread-panel {
        min-height: 60vh;
    }

    .thread-header-top {
        flex-direction: column;
    }
}