/* === MODERN CSS VARIABLES & THEMES === */
:root {
    --bg-main: #f7f7f9;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;

    --black-btn: #000000;
    --btn-text: #ffffff;
    --black-hover: #1f2937;

    --primary-accent: #3b82f6;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --success: #10b981;

    --radius-sm: 8px;
    --radius-md: 16px;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-main: #09090b;
    --bg-sidebar: #121214;
    --bg-card: #18181b;
    --text-primary: #f4f5f7;
    --text-secondary: #a1a1aa;
    --border-color: #27272a;

    --black-btn: #ffffff;
    --btn-text: #000000;
    --black-hover: #e5e7eb;
    --danger-bg: rgba(239, 68, 68, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow-x: hidden;
    overscroll-behavior-y: none;
    transition: background 0.4s ease, color 0.4s ease;
}

input,
select {
    font-size: 16px !important;
    background: transparent;
    color: var(--text-primary);
}

.desktop-only {
    display: flex;
}

.mobile-only {
    display: none !important;
}

/* === FLUID ANIMATIONS === */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* === TOAST NOTIFICATION === */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background: var(--black-btn);
    color: var(--btn-text);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 9999;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

/* === CUSTOM MODAL === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 1rem;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-box {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius-md);
    width: 100%;
    max-width: 450px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3);
    border-top: 4px solid var(--black-btn);
    transform: scale(0.95) translateY(20px);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.show .modal-box {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 8px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: transform 0.2s, color 0.2s;
}

.close-btn:hover {
    color: var(--danger);
    transform: rotate(90deg);
}

.modal-input {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    outline: none;
    transition: border 0.3s, box-shadow 0.3s;
}

.modal-input:focus {
    border-color: var(--black-btn);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

/* Action Sheet Buttons */
.action-sheet-btn {
    width: 100%;
    padding: 1.2rem;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.2s;
}

.action-sheet-btn:hover {
    background: var(--border-color);
}

.action-sheet-btn.danger {
    color: var(--danger);
}

.action-sheet-btn.danger:hover {
    background: var(--danger-bg);
}

.action-sheet-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

.btn-cancel {
    padding: 1rem;
    background: transparent;
    border: none;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s;
}

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

.btn-confirm {
    padding: 1rem;
    flex: 1;
    background: var(--black-btn);
    color: var(--btn-text);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: background 0.3s, transform 0.1s;
}

.btn-confirm:hover {
    background: var(--black-hover);
    transform: translateY(-2px);
}

.btn-confirm:active {
    transform: translateY(0);
}

/* === DESKTOP LAYOUT === */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 10;
    transition: background 0.3s;
}

.sidebar-header {
    margin-bottom: 3rem;
    font-size: 1.2rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav-item {
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.nav-item i {
    font-size: 1.2rem;
}

.nav-item:hover {
    background: var(--bg-main);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item.active {
    background: var(--bg-main);
    color: var(--text-primary);
}

.btn-import {
    background: var(--bg-main);
    color: var(--text-primary);
    padding: 1rem;
    text-align: center;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: auto;
    border: 1px solid var(--border-color);
    transition: 0.2s;
    display: flex;
    justify-content: center;
    gap: 8px;
}

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

.builder-area {
    flex: 1;
    padding: 3rem 4rem;
    max-width: 850px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    transition: max-width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.builder-area.expanded {
    max-width: 1050px;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.draft-badge {
    background: var(--border-color);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 8px;
    display: inline-block;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-toggle-preview {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-toggle-preview:hover {
    background: var(--border-color);
}

.profile-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    background: var(--bg-card);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s;
}

.profile-settings:hover {
    box-shadow: var(--shadow-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border 0.3s;
}

.input-group input:focus {
    border-color: var(--black-btn);
}

.input-group.full {
    grid-column: span 2;
}

.input-bar {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: 4px solid var(--black-btn);
    padding: 1.5rem;
    margin-bottom: 2.5rem;
    border-radius: var(--radius-sm);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.input-bar:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.input-bar::before {
    content: '\f0c1  Add New Link';
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    display: flex;
    gap: 10px;
    color: var(--text-primary);
}

/* === ACTIVE NODES & DRAG/DROP STYLES === */
.section-title {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.node-list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 2rem;
}

.node-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1rem 1.2rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
    animation: slideInUp 0.4s ease-out forwards;
    transform-origin: center;
}

.node-card:not(.dragging):hover {
    transform: scale(1.01) translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--black-btn);
}

.node-card.disabled {
    opacity: 0.4;
    filter: grayscale(100%);
    background: var(--bg-main);
    transform: none;
    box-shadow: none;
    border-color: var(--border-color);
}

.drag-handle {
    cursor: grab;
    font-size: 1.4rem;
    color: var(--text-secondary);
    padding-right: 4px;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}

.drag-handle:hover {
    color: var(--text-primary);
}

.drag-handle:active {
    cursor: grabbing;
}

.node-card.dragging {
    opacity: 0.5;
    border: 2px dashed var(--primary-accent);
    box-shadow: none;
    transform: scale(0.98);
}

.node-card.drag-over {
    border-top: 4px solid var(--primary-accent);
    padding-top: 0.8rem;
}

.node-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #f3f4f6;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: #4b5563;
    flex-shrink: 0;
    transition: background 0.3s, color 0.3s;
}

[data-theme="dark"] .node-icon-wrapper {
    background: #27272a;
    color: #a1a1aa;
}

.node-card:hover .node-icon-wrapper {
    background: var(--black-btn);
    color: var(--btn-text);
}

.node-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.node-title-input {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    border: none;
    background: transparent;
    outline: none;
    transition: color 0.3s;
}

.node-url-input {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    border: none;
    background: transparent;
    outline: none;
}

.node-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 4px;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    transition: all 0.2s;
}

.btn-icon:hover {
    color: var(--text-primary);
    background: var(--bg-main);
    transform: scale(1.1);
}

.btn-icon.delete:hover {
    color: var(--danger);
    background: var(--danger-bg);
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--black-btn);
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-switch.off {
    background: var(--border-color);
}

.toggle-knob {
    position: absolute;
    top: 2px;
    left: 22px;
    width: 20px;
    height: 20px;
    background: var(--bg-card);
    border-radius: 50%;
    transition: left 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch.off .toggle-knob {
    left: 2px;
    box-shadow: none;
}

.desktop-deploy-btn {
    display: flex;
    width: 100%;
    padding: 1.2rem;
    background: var(--black-btn);
    color: var(--btn-text);
    border: none;
    border-radius: var(--radius-sm);
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.desktop-deploy-btn:hover {
    background: var(--black-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.15);
}

.desktop-deploy-btn:active {
    transform: translateY(0);
}

/* COLLAPSIBLE PREVIEW */
.preview-pane {
    width: 450px;
    background: var(--bg-main);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.4s, opacity 0.4s;
}

.preview-pane.collapsed {
    width: 0;
    padding-left: 0;
    padding-right: 0;
    opacity: 0;
    border-left: none;
    pointer-events: none;
}

.preview-header {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    letter-spacing: 1px;
    white-space: nowrap;
}

.phone-mockup {
    width: 100%;
    max-width: 340px;
    height: 85vh;
    min-height: 500px;
    max-height: 750px;
    background: var(--bg-card);
    border: 14px solid var(--text-primary);
    border-radius: 45px;
    position: relative;
    box-shadow: var(--shadow-md);
    padding: 4rem 1.5rem 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: border-color 0.3s, background 0.3s;
    overflow-y: auto;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 130px;
    height: 28px;
    background: var(--text-primary);
    border-bottom-left-radius: 18px;
    border-bottom-right-radius: 18px;
    z-index: 2;
    transition: background 0.3s;
}

.profile-pic {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    margin-bottom: 1rem;
    background: var(--border-color);
    object-fit: cover;
    animation: fadeIn 0.5s ease-out;
    flex-shrink: 0;
}

.profile-name {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-align: center;
    width: 100%;
}

.profile-bio {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
    width: 100%;
    line-height: 1.4;
}

.phone-link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 12px;
    transition: all 0.3s ease;
    flex-shrink: 0;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
}

.phone-link:hover {
    transform: scale(1.03);
    border-color: var(--black-btn);
}

/* === MOBILE ANIMATED LAYOUT === */
@media (max-width: 1024px) {
    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: flex !important;
    }

    .app-layout {
        display: block;
        padding-bottom: 80px;
    }

    .mobile-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.8rem 1.5rem;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        position: sticky;
        top: 0;
        z-index: 100;
    }

    .mobile-logo {
        font-weight: 800;
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 1.1rem;
        color: var(--primary-accent);
    }

    .builder-area {
        padding: 2rem 1.5rem;
        width: 100%;
        background: var(--bg-main);
    }

    .mobile-hero {
        display: block;
        margin-bottom: 1.5rem;
    }

    .mobile-hero h1 {
        font-size: 2.2rem;
        font-weight: 800;
        letter-spacing: -0.5px;
        margin-bottom: 0.5rem;
    }

    .mobile-hero p {
        color: var(--text-secondary);
        font-size: 1.05rem;
    }

    .profile-settings {
        grid-template-columns: 1fr;
        padding: 1.2rem;
        margin-bottom: 2.5rem;
    }

    .input-group.full {
        grid-column: span 1;
    }

    .mobile-fab {
        display: flex;
        position: fixed;
        bottom: 85px;
        right: 20px;
        width: 60px;
        height: 60px;
        border-radius: 50%;
        background: var(--black-btn);
        color: var(--btn-text);
        justify-content: center;
        align-items: center;
        font-size: 1.8rem;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
        border: none;
        z-index: 99;
        cursor: pointer;
        transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .mobile-fab:active {
        transform: scale(0.85);
    }

    .mobile-bottom-nav {
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: var(--bg-card);
        border-top: 1px solid var(--border-color);
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        padding-bottom: env(safe-area-inset-bottom);
        z-index: 100;
        transition: background 0.3s;
    }

    .nav-tab {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 6px;
        padding: 1rem 0;
        color: var(--text-secondary);
        font-size: 0.7rem;
        font-weight: 700;
        text-decoration: none;
        border-top: 3px solid transparent;
        transition: all 0.2s;
    }

    .nav-tab.active {
        color: var(--text-primary);
        border-top-color: var(--black-btn);
    }

    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }

    .modal-box {
        border-radius: 24px 24px 0 0;
        padding-bottom: calc(2.5rem + env(safe-area-inset-bottom));
        border-top: none;
        transform: translateY(100%) !important;
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1) !important;
        margin: 0;
        max-width: 100%;
    }

    .modal-overlay.show .modal-box {
        transform: translateY(0) !important;
        animation: none;
    }
}

/* === PUBLIC VIEWER STYLES === */
.public-theme-select {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-primary);
    outline: none;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.public-theme-select:hover {
    border-color: var(--black-btn);
}

.public-container {
    width: 100%;
    max-width: 450px;
    margin: 5rem auto;
    background: var(--bg-card);
    padding: 3rem 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow-md);
    animation: slideInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}



.btn-import {
    display: flex;
    width: 100%;
    padding: .9rem;
    background: var(--black-btn);
    color: var(--btn-text);
    border: none;
    border-radius: var(--radius-sm);
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}