:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-success: #16a34a;
    --color-warning: #ca8a04;
    --color-danger: #dc2626;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-500: #6b7280;
    --color-gray-700: #374151;
    --color-gray-900: #111827;

    --color-ami: #16a34a;
    --color-collegue: #2563eb;
    --color-famille: #ea580c;
    --color-conjoint: #dc2626;
    --color-connait: #6b7280;

    --radius: 0.5rem;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);

    --header-height: 3.5rem;
    --aside-width: 280px;
}

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

html {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-gray-900);
    background: var(--color-gray-50);
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    grid-template-rows: var(--header-height) 1fr;
}

/* === HEADER === */

body > header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

body > header h1 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

body > header nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#sync-status {
    font-size: 1.25rem;
    margin-left: 0.5rem;
}

#sync-status.online { color: var(--color-success); }
#sync-status.offline { color: var(--color-danger); }
#sync-status.syncing { color: var(--color-warning); animation: pulse 1s infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* === MAIN LAYOUT === */

main {
    display: grid;
    grid-template-columns: var(--aside-width) 1fr 1fr;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* === ASIDE (Liste contacts) === */

#panel-list {
    background: white;
    border-right: 1px solid var(--color-gray-200);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#panel-list search {
    padding: 0.75rem;
    border-bottom: 1px solid var(--color-gray-200);
}

#search-input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
}

#search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

#contacts-list {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow-y: auto;
    flex: 1;
}

#contacts-list li {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-gray-100);
    cursor: pointer;
    transition: background 0.15s;
}

#contacts-list li:hover {
    background: var(--color-gray-50);
}

#contacts-list li.selected {
    background: var(--color-primary);
    color: white;
}

#contacts-list li strong {
    display: block;
    font-weight: 500;
}

#contacts-list li small {
    color: var(--color-gray-500);
    font-size: 0.75rem;
}

#contacts-list li.selected small {
    color: rgba(255,255,255,0.8);
}

/* === PANEL DETAIL === */

#panel-detail {
    padding: 1.5rem;
    overflow-y: auto;
    background: white;
    border-right: 1px solid var(--color-gray-200);
}

#no-selection {
    color: var(--color-gray-500);
    text-align: center;
    margin-top: 3rem;
}

#contact-detail header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

#contact-detail h2 {
    margin: 0;
    font-size: 1.5rem;
}

#contact-detail menu {
    display: flex;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

#contact-detail dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1rem;
    margin: 0 0 1.5rem;
}

#contact-detail dt {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

#contact-detail dd {
    margin: 0;
}

#contact-detail dd:empty::after {
    content: "—";
    color: var(--color-gray-300);
}

#contact-relations h3 {
    font-size: 1rem;
    margin: 0 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-gray-200);
}

#relations-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

#relations-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-gray-100);
}

#relations-list li:last-child {
    border-bottom: none;
}

.relation-type {
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    border-radius: 1rem;
    color: white;
    text-transform: capitalize;
}

.relation-type.ami { background: var(--color-ami); }
.relation-type.collegue { background: var(--color-collegue); }

.relation-name {
    flex: 1;
    cursor: pointer;
}

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

.relation-actions {
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: opacity 0.15s;
}

#relations-list li:hover .relation-actions {
    opacity: 1;
}

.btn-edit-rel,
.btn-delete-rel {
    background: var(--color-gray-100);
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.75rem;
}

.btn-edit-rel:hover {
    background: var(--color-gray-200);
}

.btn-delete-rel:hover {
    background: var(--color-danger);
    color: white;
}
.relation-type.famille { background: var(--color-famille); }
.relation-type.conjoint { background: var(--color-conjoint); }
.relation-type.connait { background: var(--color-connait); }

/* === PANEL GRAPH === */

#panel-graph {
    background: var(--color-gray-100);
    overflow: hidden;
    position: relative;
}

#graph {
    width: 100%;
    height: 100%;
}

/* === BUTTONS === */

button {
    font-family: inherit;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}

button:active {
    transform: scale(0.98);
}

header button {
    background: rgba(255,255,255,0.15);
    color: white;
}

header button:hover {
    background: rgba(255,255,255,0.25);
}

#contact-detail button {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    padding: 0.375rem 0.625rem;
}

#contact-detail button:hover {
    background: var(--color-gray-200);
}

/* === DIALOGS === */

dialog {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
    max-width: 28rem;
    width: 90%;
}

dialog::backdrop {
    background: rgba(0,0,0,0.4);
}

dialog h2 {
    margin: 0 0 1.25rem;
    font-size: 1.25rem;
}

dialog p {
    margin: 0 0 1rem;
}

dialog label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    color: var(--color-gray-700);
}

dialog input,
dialog select,
dialog textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.875rem;
}

dialog input:focus,
dialog select:focus,
dialog textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

dialog menu {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

dialog menu button {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

dialog menu button:hover {
    background: var(--color-gray-200);
}

dialog menu button[type="submit"],
#btn-confirm-yes {
    background: var(--color-primary);
    color: white;
}

dialog menu button[type="submit"]:hover,
#btn-confirm-yes:hover {
    background: var(--color-primary-dark);
}

#btn-confirm-yes {
    background: var(--color-danger);
}

#btn-confirm-yes:hover {
    background: #b91c1c;
}

/* === TOAST NOTIFICATIONS === */

#toast-container {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    background: var(--color-gray-900);
    color: white;
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 20rem;
}

.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }
.toast.warning { background: var(--color-warning); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* === SYNC BUTTON === */

#btn-sync {
    background: transparent;
    padding: 0.375rem;
    font-size: 1.25rem;
    line-height: 1;
}

#btn-sync:hover {
    background: rgba(255,255,255,0.15);
}

#btn-sync.syncing {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* === MENU MOBILE === */

#btn-menu {
    display: none;
    background: transparent;
    padding: 0.375rem;
    font-size: 1.5rem;
    line-height: 1;
}

#btn-back {
    display: none;
    background: transparent;
    padding: 0.375rem;
    font-size: 1.25rem;
    line-height: 1;
    margin-right: 0.5rem;
}

/* === EMPTY STATE === */

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-gray-500);
}

.empty-state p {
    margin: 0.5rem 0;
}

/* === PENDING BADGE === */

.pending-badge {
    display: inline-block;
    background: var(--color-warning);
    color: white;
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    border-radius: 1rem;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* === RESPONSIVE === */

@media (max-width: 1024px) {
    main {
        grid-template-columns: var(--aside-width) 1fr;
    }

    #panel-graph {
        display: none;
    }
}

@media (max-width: 640px) {
    :root {
        --aside-width: 100%;
        --header-height: 3rem;
    }

    body > header h1 {
        font-size: 1.1rem;
    }

    body > header nav {
        gap: 0.25rem;
    }

    header button {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }

    #btn-menu {
        display: block;
    }

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

    #panel-list {
        display: none;
    }

    #panel-list.active {
        display: flex;
        position: fixed;
        inset: var(--header-height) 0 0 0;
        z-index: 50;
        background: white;
    }

    #panel-detail {
        border-right: none;
    }

    #panel-detail.has-selection #btn-back {
        display: block;
    }

    #contact-detail h2 {
        font-size: 1.25rem;
    }

    #contact-detail dl {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    #contact-detail dt {
        margin-top: 0.5rem;
    }

    dialog {
        padding: 1rem;
        max-width: 100%;
        width: 95%;
    }

    #toast-container {
        left: 1rem;
        right: 1rem;
    }

    .toast {
        max-width: 100%;
    }
}