/* ==========================================================================
   STYLE GLOBAL - THÈME CLAIR MODERNE & PROFESSIONNEL
   Boîte à outils Réseau & Calculateur de sous-réseaux
   ========================================================================== */

:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-subtle: #f1f5f9;
    --bg-hover: #e2e8f0;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --primary-border: #c7d2fe;

    --accent-blue: #2563eb;
    --accent-emerald: #059669;
    --accent-emerald-light: #ecfdf5;
    --accent-amber: #d97706;
    --accent-amber-light: #fffbeb;
    --accent-red: #dc2626;
    --accent-red-light: #fef2f2;
    --accent-purple: #7c3aed;
    --accent-purple-light: #f5f3ff;

    --border-color: #e2e8f0;
    --border-focus: #6366f1;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   HEADER & NAVIGATION (LIGHT THEME)
   ========================================================================== */

.app-header {
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 1rem 1rem;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.03);
}

.header-top {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #4f46e5 0%, #2563eb 100%);
    color: #ffffff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.25);
}

.brand-text h1 {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.brand-text p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--accent-emerald-light);
    color: var(--accent-emerald);
    border: 1px solid #a7f3d0;
    border-radius: 9999px;
    font-size: 0.78rem;
    font-weight: 600;
}

/* Nav Tabs */
.nav-tabs-wrapper {
    max-width: 1100px;
    margin: 0 auto;
    overflow-x: auto;
    padding-bottom: 0.25rem;
    scrollbar-width: thin;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    min-width: max-content;
}

.nav-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.nav-tab-btn:hover {
    background-color: var(--bg-subtle);
    color: var(--text-main);
    border-color: #cbd5e1;
}

.nav-tab-btn.active {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary-border);
    font-weight: 600;
}

/* ==========================================================================
   MAIN CONTAINER
   ========================================================================== */

.app-main {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1rem 3rem;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.2s ease-out;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   SECTION INTRO (LUMINEUX)
   ========================================================================== */

.section-intro {
    margin-bottom: 1.5rem;
}

.section-intro h2 {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.025em;
    margin-bottom: 0.4rem;
}

.section-intro p {
    font-size: 0.975rem;
    color: var(--text-muted);
    line-height: 1.5;
    max-width: 900px;
}

/* ==========================================================================
   CARDS & CONTAINERS
   ========================================================================== */

.tool-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 2rem;
}

/* ==========================================================================
   FORM CONTROLS & INPUTS
   ========================================================================== */

.input-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
    .input-grid-2 {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-main);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-input, .form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: #ffffff;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: var(--font-mono);
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.form-input.is-invalid {
    border-color: var(--accent-red);
    background-color: #fffbfa;
}

.ip-quick-chips {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.chip-btn {
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    font-size: 0.78rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all 0.1s ease;
}

.chip-btn:hover {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary-border);
}

/* Card Header Action (Local badge) */
.card-meta-bar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 0.75rem;
    margin-bottom: 0.75rem;
}

.badge-local {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.badge-local svg {
    color: var(--accent-emerald);
}

/* ==========================================================================
   RESULTS TABLE (FIDÈLE À LA CAPTURE D'ÉCRAN MAIS THÈME CLAIR)
   ========================================================================== */

.results-table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.results-table tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.1s ease;
}

.results-table tr:last-child {
    border-bottom: none;
}

.results-table tr:hover {
    background-color: #f8fafc;
}

.results-table td {
    padding: 0.85rem 1.25rem;
    font-size: 0.92rem;
    vertical-align: middle;
}

.results-table td.col-label {
    font-weight: 600;
    color: #475569;
    width: 32%;
    min-width: 180px;
}

.results-table td.col-value {
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.94rem;
    word-break: break-all;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.val-text {
    flex: 1;
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.35rem;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    opacity: 0.7;
}

.results-table tr:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary);
}

/* Badges de statuts pour types d'IP */
.scope-tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-sans);
    margin-left: 0.5rem;
}

.scope-tag.blue { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }
.scope-tag.emerald { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.scope-tag.amber { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.scope-tag.purple { background: #ede9fe; color: #5b21b6; border: 1px solid #ddd6fe; }
.scope-tag.red { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.scope-tag.slate { background: #f1f5f9; color: #334155; border: 1px solid #e2e8f0; }

/* ==========================================================================
   BOUTONS ET ACTIONS
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
}

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

.btn-outline {
    background-color: #ffffff;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-subtle);
    border-color: #cbd5e1;
}

.btn-danger {
    background-color: var(--accent-red-light);
    color: var(--accent-red);
    border-color: #fca5a5;
}

.btn-danger:hover {
    background-color: #fee2e2;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

/* ==========================================================================
   VLSM TOOL STYLES
   ========================================================================== */

.vlsm-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.vlsm-table th {
    background-color: #f1f5f9;
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #475569;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.vlsm-table td {
    padding: 0.75rem 1rem;
    font-size: 0.88rem;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
}

.vlsm-table tr:hover td {
    background-color: #f8fafc;
}

.vlsm-summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.summary-card {
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

.summary-card .label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.summary-card .value {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-main);
    margin-top: 0.25rem;
    font-family: var(--font-mono);
}

/* Dynamic row list */
.dynamic-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

/* ==========================================================================
   PORTS DIRECTORY
   ========================================================================== */

.search-bar-wrapper {
    position: relative;
    margin-bottom: 1.25rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-input {
    width: 100%;
    padding: 0.85rem 1rem 0.85rem 2.75rem;
    background-color: #ffffff;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--text-main);
    outline: none;
    transition: all 0.15s ease;
}

.search-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.port-badge {
    background-color: #e0e7ff;
    color: #3730a3;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

/* ==========================================================================
   CONVERTISSEUR / TRANSFERT / MAC
   ========================================================================== */

.converter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

.conv-item {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

.conv-item .label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.conv-item .val {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    word-break: break-all;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ==========================================
   TOAST NOTIFICATION
   ========================================== */

.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    pointer-events: none;
}

.toast {
    background-color: #0f172a;
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
    animation: toastIn 0.25s ease-out, toastOut 0.25s ease-in 2.5s forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(12px); }
}

/* ==========================================================================
   FOOTER (LIGHT THEME & SIGNATURE DEMANDÉE)
   ========================================================================== */

.app-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 2rem 1rem;
    margin-top: auto;
    text-align: center;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
}

.footer-signature {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
}

.footer-signature .badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
}

.footer-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}