/* ===========================
   CSS VARIABLES & THEME
   =========================== */
:root {
    --bg: #f0f4ff;
    --bg-card: rgba(255, 255, 255, 0.82);
    --bg-card-solid: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.75);
    --text: #1a1d2e;
    --text-muted: #6b7280;
    --text-light: #9ca3af;
    --border: rgba(99, 102, 241, 0.15);
    --border-focus: #6366f1;
    --accent: #6366f1;
    --accent-2: #8b5cf6;
    --accent-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-grad-hover: linear-gradient(135deg, #4f52d1 0%, #7c3aed 100%);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(99, 102, 241, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(99, 102, 241, 0.14), 0 4px 10px rgba(0, 0, 0, 0.08);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    --group-colors: #6366f1, #8b5cf6, #ec4899, #06b6d4, #10b981, #f59e0b, #ef4444, #3b82f6;
}

[data-theme="dark"] {
    --bg: #0f1117;
    --bg-card: rgba(26, 29, 46, 0.85);
    --bg-card-solid: #1a1d2e;
    --header-bg: rgba(15, 17, 23, 0.85);
    --text: #e8eaf6;
    --text-muted: #9ca3af;
    --text-light: #6b7280;
    --border: rgba(99, 102, 241, 0.25);
    --border-focus: #818cf8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4), 0 4px 10px rgba(0, 0, 0, 0.25);
}

/* ===========================
   RESET & BASE
   =========================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background-color: var(--bg);
    background-image:
        radial-gradient(ellipse at 20% 10%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 90%, rgba(139, 92, 246, 0.10) 0%, transparent 50%);
    min-height: 100vh;
    color: var(--text);
    transition: background-color var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
}

/* ===========================
   HEADER
   =========================== */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
}

.logo-icon {
    font-size: 1.4rem;
    color: #8b5cf6;
    vertical-align: middle;
    animation: pulse 3s ease-in-out infinite;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 800;
    background: var(--accent-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.3px;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.12);
    }
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition);
    color: var(--text);
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
    background: var(--accent);
    border-color: var(--accent);
}

/* ===========================
   MAIN CONTAINER
   =========================== */
.container {
    max-width: 780px;
    margin: 0 auto;
    padding: 30px 20px 60px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ===========================
   CARDS
   =========================== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition), transform var(--transition);
    animation: slideInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 22px;
    flex-wrap: wrap;
}

.card-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    flex: 1;
    min-width: 0;
}

.step-badge {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-grad);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

.badge {
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: 999px;
    padding: 3px 12px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
}

/* ===========================
   DROP ZONE
   =========================== */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 36px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: rgba(99, 102, 241, 0.02);
    outline: none;
}

.drop-zone:hover,
.drop-zone.drag-active {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.06);
    transform: scale(1.01);
}

.drop-zone:focus-visible {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.drop-zone.drag-active .drop-icon {
    animation: bounce 0.5s ease infinite alternate;
}

@keyframes bounce {
    from {
        transform: translateY(0);
    }

    to {
        transform: translateY(-8px);
    }
}

.drop-zone-inner {
    pointer-events: none;
}

.drop-icon {
    font-size: 3.5rem;
    margin-bottom: 8px;
    display: block;
    color: var(--accent);
    transition: transform var(--transition);
    user-select: none;
}

.drop-text {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.drop-sub {
    color: var(--text-muted);
    margin-bottom: 14px;
    font-size: 0.9rem;
}

.drop-hint {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 6px;
}

.file-btn {
    display: inline-block;
    padding: 9px 22px;
    background: var(--accent-grad);
    color: #fff;
    border-radius: var(--radius-xs);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    pointer-events: all;
    transition: all var(--transition);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.file-btn:hover {
    background: var(--accent-grad-hover);
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

.file-btn input[type="file"] {
    display: none;
}

/* ===========================
   MANUAL INPUT
   =========================== */
.manual-section {
    margin-top: 20px;
}

.divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 18px 0;
    color: var(--text-light);
    font-size: 0.85rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.manual-input-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.manual-input-row input {
    flex: 1;
}

/* ===========================
   INPUTS
   =========================== */
input[type="text"],
input[type="number"],
input[type="search"],
textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--bg-card-solid);
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    outline: none;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-light);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

/* ===========================
   BUTTONS
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-xs);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.97) !important;
}

.btn-primary {
    background: var(--accent-grad);
    color: #fff;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
    background: var(--accent-grad-hover);
    box-shadow: 0 4px 18px rgba(99, 102, 241, 0.45);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card-solid);
    color: var(--accent);
    border: 1.5px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.06);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 7px 14px;
    font-size: 0.85rem;
}

.btn-ghost:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--accent);
    border-color: var(--accent);
}

.btn-sm {
    padding: 6px 13px;
    font-size: 0.82rem;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.08);
    color: var(--danger);
    border-color: var(--danger);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #fff;
    box-shadow: 0 2px 10px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 4px 18px rgba(16, 185, 129, 0.45);
    transform: translateY(-2px);
}

/* Material Icons inside buttons — flush vertical alignment */
.btn-icon {
    font-size: 1.1rem;
    vertical-align: middle;
    line-height: 1;
}

/* Material Icons inside results title */
.results-title-icon {
    font-size: 1.4rem;
    vertical-align: middle;
    color: var(--accent);
}

/* ===========================
   SEARCH & SELECT ACTIONS
   =========================== */
.select-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.search-field {
    width: auto;
    flex: 1;
    min-width: 140px;
    padding: 7px 12px;
    font-size: 0.85rem;
}

/* ===========================
   NAME LIST
   =========================== */
.name-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
    max-height: 320px;
    overflow-y: auto;
    padding-right: 4px;
}

.name-list::-webkit-scrollbar {
    width: 4px;
}

.name-list::-webkit-scrollbar-track {
    background: transparent;
}

.name-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.name-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-xs);
    border: 1.5px solid var(--border);
    background: var(--bg-card-solid);
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.3;
    animation: fadeIn 0.25s ease both;
    user-select: none;
}

.name-item:hover {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
}

.name-item.checked {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.08);
}

.name-item input[type="checkbox"] {
    width: auto;
    accent-color: var(--accent);
    transform: scale(1.2);
    flex-shrink: 0;
    cursor: pointer;
    border: none;
    box-shadow: none;
    padding: 0;
}

.name-item input[type="checkbox"]:focus {
    outline: none;
    box-shadow: none;
    border-color: transparent;
}

.name-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.name-item.hidden-search {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===========================
   CONFIG
   =========================== */
.config-row {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 16px;
    margin-bottom: 22px;
}

.config-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.config-field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.action-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Leader mode field */
.leader-mode-field {
    margin-bottom: 18px;
}

.segment-control {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    overflow: hidden;
    background: var(--bg-card-solid);
    width: fit-content;
}

.segment-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border: none;
    border-right: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.segment-btn:last-child {
    border-right: none;
}

.segment-btn .material-icons-round {
    font-size: 1rem;
}

.segment-btn:hover {
    background: rgba(99, 102, 241, 0.07);
    color: var(--accent);
}

.segment-btn.active {
    background: var(--accent-grad);
    color: #fff;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.12);
}

.segment-btn[data-mode="random"].active {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.segment-btn[data-mode="manual"].active {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}


/* ===========================
   RESULTS
   =========================== */
.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    flex-wrap: wrap;
    gap: 12px;
}

.results-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text);
}

.results-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.group-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    animation: slideInUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.group-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.group-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

/* Color-coded group tops */
.group-card:nth-child(8n+1)::before {
    background: #6366f1;
}

.group-card:nth-child(8n+2)::before {
    background: #8b5cf6;
}

.group-card:nth-child(8n+3)::before {
    background: #ec4899;
}

.group-card:nth-child(8n+4)::before {
    background: #06b6d4;
}

.group-card:nth-child(8n+5)::before {
    background: #10b981;
}

.group-card:nth-child(8n+6)::before {
    background: #f59e0b;
}

.group-card:nth-child(8n+7)::before {
    background: #ef4444;
}

.group-card:nth-child(8n+8)::before {
    background: #3b82f6;
}

/* Stagger animation for group cards */
.group-card:nth-child(1) {
    animation-delay: 0.05s;
}

.group-card:nth-child(2) {
    animation-delay: 0.10s;
}

.group-card:nth-child(3) {
    animation-delay: 0.15s;
}

.group-card:nth-child(4) {
    animation-delay: 0.20s;
}

.group-card:nth-child(5) {
    animation-delay: 0.25s;
}

.group-card:nth-child(6) {
    animation-delay: 0.30s;
}

.group-card:nth-child(7) {
    animation-delay: 0.35s;
}

.group-card:nth-child(8) {
    animation-delay: 0.40s;
}

.group-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 14px;
}

.group-number {
    font-size: 1.6rem;
    font-weight: 800;
    background: var(--accent-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 14px;
}

.group-members {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.group-member {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text);
    padding: 5px 0;
    border-bottom: 1px solid var(--border);
    transition: color var(--transition);
}

.group-member:last-child {
    border-bottom: none;
}

.member-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--accent-grad);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    text-transform: uppercase;
}

.group-count-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent);
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
}

/* ===========================
   GROUP LEADER
   =========================== */
.leader-select-row {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.leader-select-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.leader-select {
    flex: 1;
    padding: 5px 10px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 0.82rem;
    font-family: inherit;
    background: var(--bg-card-solid);
    color: var(--text);
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
    width: auto;
}

.leader-select:focus {
    border-color: #f59e0b;
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

/* Leader member highlight */
.group-member.is-leader {
    font-weight: 700;
    color: #b45309;
}

[data-theme="dark"] .group-member.is-leader {
    color: #fbbf24;
}

.group-member.is-leader .member-avatar {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.35);
}

.leader-star {
    font-size: 0.85rem;
    margin-left: 2px;
    color: #f59e0b;
}

/* ===========================
   TOAST
   =========================== */
.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--text);
    color: var(--bg-card-solid);
    padding: 12px 24px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s;
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    max-width: 90vw;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success);
    color: #fff;
}

.toast.error {
    background: var(--danger);
    color: #fff;
}

.toast.info {
    background: var(--accent);
    color: #fff;
}

/* ===========================
   FOOTER
   =========================== */
.app-footer {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 0.82rem;
    border-top: 1px solid var(--border);
}

/* ===========================
   SKELETON / LOADING
   =========================== */
@keyframes shimmer {
    0% {
        background-position: -200% center;
    }

    100% {
        background-position: 200% center;
    }
}

/* ===========================
   RESPONSIVE — tous écrans
   =========================== */

/* ── Très grands écrans : 1400px+ ────────────────────── */
@media (min-width: 1400px) {
    .container {
        max-width: 960px;
        padding: 40px 24px 80px;
    }

    .card {
        padding: 36px 40px;
    }

    .groups-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }

    .name-list {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }

    .card-header h2 {
        font-size: 1.25rem;
    }

    .drop-zone {
        padding: 50px 20px;
    }

    .drop-icon {
        font-size: 4.5rem;
    }
}

/* ── Desktop large : 1200px – 1399px ─────────────────── */
@media (min-width: 1200px) and (max-width: 1399px) {
    .container {
        max-width: 880px;
    }

    .groups-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

/* ── Desktop standard : 1024px – 1199px ──────────────── */
@media (min-width: 1024px) and (max-width: 1199px) {
    .container {
        max-width: 820px;
    }

    .groups-grid {
        grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    }
}

/* ── Tablette paysage : 768px – 1023px ───────────────── */
@media (min-width: 768px) and (max-width: 1023px) {
    .container {
        max-width: 700px;
        padding: 24px 20px 60px;
    }

    .groups-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .name-list {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }

    .config-row {
        grid-template-columns: 1fr 1.5fr;
        gap: 12px;
    }

    .drop-zone {
        padding: 30px 16px;
    }
}

/* ── Tablette portrait : 600px – 767px ───────────────── */
@media (min-width: 600px) and (max-width: 767px) {
    .container {
        max-width: 580px;
        padding: 20px 16px 60px;
    }

    .groups-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .name-list {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }

    .config-row {
        grid-template-columns: 1fr;
    }

    .drop-zone {
        padding: 28px 14px;
    }

    .select-actions {
        flex-wrap: wrap;
    }
}

/* ── Mobile large : 400px – 599px ────────────────────── */
@media (max-width: 599px) {
    .container {
        padding: 16px 12px 50px;
    }

    .card {
        padding: 18px 16px;
    }

    .card-header h2 {
        font-size: 1rem;
    }

    .config-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .groups-grid {
        grid-template-columns: 1fr;
    }

    .name-list {
        grid-template-columns: 1fr 1fr;
        max-height: 260px;
    }

    .manual-input-row {
        flex-direction: column;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .results-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .header-content {
        padding: 0 12px;
    }

    .logo-text {
        font-size: 1.05rem;
    }

    .select-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .search-field {
        width: 100%;
    }

    .action-row {
        flex-direction: column;
        gap: 10px;
    }

    .action-row .btn {
        justify-content: center;
        width: 100%;
    }

    .drop-zone {
        padding: 24px 12px;
    }

    .drop-icon {
        font-size: 2.8rem;
    }

    .drop-text {
        font-size: 0.95rem;
    }

    .btn {
        padding: 9px 16px;
        font-size: 0.9rem;
    }

    .file-btn {
        padding: 8px 18px;
        font-size: 0.88rem;
    }

    .results-title {
        font-size: 1.1rem;
    }

    .group-number {
        font-size: 1.3rem;
    }

    .toast {
        font-size: 0.82rem;
        padding: 10px 18px;
    }
}

/* ── Mobile petit : 360px – 399px ────────────────────── */
@media (max-width: 399px) {
    .container {
        padding: 12px 10px 44px;
    }

    .card {
        padding: 14px 12px;
    }

    .name-list {
        grid-template-columns: 1fr;
        max-height: 240px;
    }

    .step-badge {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
    }

    .header-content {
        height: 52px;
    }

    .btn-sm {
        padding: 5px 10px;
        font-size: 0.78rem;
    }

    .select-actions {
        gap: 6px;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .drop-zone {
        padding: 18px 10px;
    }
}

/* ── Très petit écran : ≤ 319px ──────────────────────── */
@media (max-width: 319px) {
    .container {
        padding: 8px 8px 40px;
    }

    .card {
        padding: 12px 10px;
    }

    .logo-text {
        display: none;
    }

    .card-header h2 {
        font-size: 0.9rem;
    }

    .btn {
        padding: 8px 12px;
        font-size: 0.82rem;
    }

    .drop-text {
        font-size: 0.85rem;
    }

    .drop-sub {
        display: none;
    }

    .drop-hint {
        font-size: 0.72rem;
    }
}

/* ── Impression ───────────────────────────────────────── */
@media print {

    .app-header,
    .app-footer,
    #importSection,
    #nameListSection,
    #configSection,
    .results-actions,
    .toast {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
    }

    .groups-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .group-card {
        break-inside: avoid;
        border: 1px solid #ccc !important;
        box-shadow: none !important;
    }

    #resultsSection {
        display: block !important;
    }
}

/* ── Préférence mouvement réduit ─────────────────────── */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}
/* ===========================
   ENHANCED VIEW & COLOR MODES
   =========================== */
.results-options {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* List View */
.groups-grid.list-view {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
}

.groups-grid.list-view .group-card {
    min-height: auto;
}

/* Sober Mode */
.groups-grid.sober-mode .group-card::before {
    background: var(--unified-color, var(--accent)) !important;
    display: var(--sober-display, block);
}

.groups-grid.sober-mode .group-card:hover {
    border-color: var(--unified-color, var(--accent));
}

.groups-grid.sober-mode .group-number {
    background: var(--unified-color, var(--accent));
    -webkit-text-fill-color: var(--unified-color, var(--accent));
    background-clip: text;
}

/* Color Palette & Swatches */
.color-palette {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 5px 10px;
    background: var(--bg-card-solid);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    animation: fadeIn 0.3s ease both;
}

.swatch {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
    flex-shrink: 0;
}

.swatch:hover {
    transform: scale(1.25);
}

.swatch.active {
    border-color: var(--text);
    box-shadow: 0 0 0 2px var(--bg-card-solid), 0 0 0 4px var(--accent);
}

/* Specific button icons for toggles */
.segment-btn .material-icons-round {
    font-size: 1.1rem;
}

@media (max-width: 599px) {
    .results-options {
        width: 100%;
        justify-content: flex-start;
    }
}

/* ===========================
   TOGGLE SWITCH (BALANCING)
   =========================== */
.toggle-switch {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.toggle-switch input {
    display: none;
}

.toggle-slider {
    width: 42px;
    height: 22px;
    background: var(--text-light);
    border-radius: 999px;
    position: relative;
    transition: all var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: 50%;
    transition: all var(--transition);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent-grad);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.balancing-field {
    margin-top: 10px;
    margin-bottom: 22px;
    padding: 12px 16px;
    background: rgba(99, 102, 241, 0.04);
    border-radius: var(--radius-sm);
    border: 1px dashed var(--border);
    width: fit-content;
}

[data-theme="dark"] .toggle-slider {
    background: #374151;
}