:root {
        --sidebar-bg-1: hsl(230, 10%, 35%);
        --sidebar-bg-2: #202125;
        --sidebar-hover: rgba(85, 83, 83, 0.08);
        --sidebar-active: linear-gradient(90deg,#939394,#555964);
        --text-main: #f8fafc;
        --text-muted: #cbd5e1;
        --radius: 16px;
    }

    /* ===== SIDEBAR ===== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 270px;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 999;
    background: linear-gradient(140deg, rgba(15, 23, 42, 0.96), rgba(30, 64, 175, 0.9)), 
                linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
    box-shadow: 0 22px 44px rgba(15, 23, 42, 0.18);
    border-right: 1px solid rgba(255,255,255,.05);
    padding: 18px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: 'Inter', system-ui, sans-serif;
    box-shadow: 10px 0 30px rgba(0,0,0,.35);
    transition: all .3s ease;
}

        .sidebar::-webkit-scrollbar {
            width: 6px;
        }

        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255,255,255,.12);
            border-radius: 20px;
        }

    /* ===== MAIN CONTENT ===== */

    .main-content {
        margin-left: 260px;
        min-height: 100vh;
        overflow-y: auto;
        padding: 12px;
    }

    .sidebar-section-title {
        font-size: 11px;
        font-weight: 700;
        letter-spacing: 1px;
        color: rgba(255,255,255,.4);
        padding: 14px 14px 6px;
    }
    /* ===== BUTTON ===== */

    .modern-btn,
    .dropdown-title {
        all: unset;
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 12px 14px;
        border-radius: var(--radius);
        cursor: pointer;
        transition: all .25s ease;
        color: var(--text-main);
        box-sizing: border-box;
    }

        .modern-btn:hover,
        .dropdown-title:hover {
            background: var(--sidebar-hover);
            transform: translateX(2px);
            box-shadow: 0 6px 18px rgba(0,0,0,.25);
        }

        /* ===== ACTIVE ===== */

        .modern-btn.active {
            background: var(--sidebar-active);
            box-shadow: 0 8px 22px rgba(37,99,235,.35);
            color: white !important;
        }

    /* ===== LEFT MENU ===== */

    .menu-left {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    /* ===== ICON BOX ===== */

    .icon-box {
        width: 32px;
        height: 32px;
        min-width: 32px;
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 12px;
        box-shadow: 0 4px 16px rgba(0,0,0,.25);
        transition: all .25s ease;
    }

    .modern-btn:hover .icon-box,
    .dropdown-title:hover .icon-box {
        transform: scale(1.08);
    }

    /* ===== ICON COLORS ===== */

    .home-icon {
        background: linear-gradient(135deg,#8daafa,#4e97fd);
    }

    .calendar-icon {
        background: linear-gradient(135deg,#0ea5e9,#0284c7);
    }

    .file-icon {
        background: linear-gradient(135deg,#ec4899,#db2777);
    }

    .input-icon {
        background: linear-gradient(135deg,#10b981,#059669);
    }

    .lock-icon {
        background: linear-gradient(135deg,#f59e0b,#d97706);
    }

    .magic-icon {
        background: linear-gradient(135deg,#22c55e,#16a34a);
    }

    .ai-icon {
        background: linear-gradient(135deg,#8b5cf6,#7c3aed);
    }

    .sub-icon {
        background: rgba(255,255,255,.10);
    }

    /* ===== TEXT ===== */

    .modern-btn span,
    .dropdown-title span {
        font-size: 13px;
        font-weight: 600;
        color: var(--text-main);
    }

    /* ===== DROPDOWN ===== */

    .dropdown-menu-block {
        padding-bottom: 8px;
        margin-bottom: 8px;
        border-bottom: 1px solid rgba(255,255,255,.05);
    }


    .dropdown-content {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: max-height .35s ease, opacity .25s ease, margin .25s ease;
        margin-left: 10px;
    }

        .dropdown-content.show {
            max-height: 800px;
            opacity: 1;
            margin-top: 4px;
            margin-bottom: 8px;
        }

        .dropdown-content .modern-btn {
            padding: 10px 12px;
            margin-bottom: 4px;
        }

            .dropdown-content .modern-btn span {
                font-size: 13px;
                color: var(--text-muted);
            }

            .dropdown-content .modern-btn:hover span {
                color: white;
            }

    /* ===== INFO BOX ===== */

    .current-file-box {
        margin-top: 12px;
        padding: 14px;
        border-radius: 16px;
        background: rgba(255,255,255,.05);
        border: 1px solid rgba(255,255,255,.08);
        color: var(--text-muted);
        font-size: 12px;
        backdrop-filter: blur(10px);
    }

        .current-file-box strong {
            color: white;
        }

    .sidebar-select {
        width: 100%;
        margin-top: 10px;
        padding: 10px 12px;
        border: 1px solid rgba(255,255,255,.08);
        border-radius: 12px;
        background: rgba(15,23,42,.28);
        color: var(--text-main);
        font-size: 13px;
        outline: none;
        transition: border-color .25s ease, background .25s ease, box-shadow .25s ease;
    }

        .sidebar-select:focus {
            border-color: rgba(96,165,250,.55);
            background: rgba(15,23,42,.38);
            box-shadow: 0 0 0 3px rgba(96,165,250,.16);
        }

        .sidebar-select option {
            color: #0f172a;
        }

    /* ===== HAMBURGER ===== */

    .modern-hamburger {
        display: none;
    }

/* ===============================
   COLLAPSED SIDEBAR
================================ */

.sidebar.collapsed {
    width: 84px;
    padding-left: 10px;
    padding-right: 10px;
}

.sidebar.collapsed .modern-btn span,
.sidebar.collapsed .dropdown-title span,
.sidebar.collapsed .current-file-box,
.sidebar.collapsed .dropdown-title i.bi-chevron-up,
.sidebar.collapsed .dropdown-title i.bi-chevron-down,
.sidebar.collapsed .sidebar-section-title {
    display: none;
}

.sidebar.collapsed .menu-left {
    width: 100%;
    justify-content: center;
}

.sidebar.collapsed .modern-btn,
.sidebar.collapsed .dropdown-title {
    justify-content: center;
    padding: 12px;
}

.sidebar.collapsed .dropdown-content {
    margin-left: 0;
}

.sidebar.collapsed .dropdown-content .modern-btn {
    justify-content: center;
}

/* ===============================
   TOOLTIP
================================ */

.menu-tooltip {
    position: absolute;
    left: 82px;
    top: 50%;
    transform: translateY(-50%);
    background: #111827;
    color: white;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all .2s ease;
    box-shadow: 0 10px 25px rgba(0,0,0,.25);
    z-index: 2000;
}

.sidebar.collapsed .modern-btn,
.sidebar.collapsed .dropdown-title {
    position: relative;
}

.sidebar.collapsed .modern-btn:hover .menu-tooltip,
.sidebar.collapsed .dropdown-title:hover .menu-tooltip {
    opacity: 1;
    left: 92px;
}

/* ===============================
   COLLAPSE BUTTON
================================ */

/* ===============================
   MAIN CONTENT
================================ */

.main-content {
    margin-left: 270px;
    transition: margin-left .3s ease;
}

.sidebar.collapsed ~ .main-content {
    margin-left: 84px;
}

/* ===============================
   PROFESSIONAL ACTIVE
================================ */

.modern-btn.active {
    position: relative;
    background: rgba(255,255,255,.08);
    box-shadow: none;
}

.modern-btn.active::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 10px;
    bottom: 10px;
    width: 4px;
    border-radius: 20px;
    background: #60a5fa;
}

/* ===============================
   BETTER HOVER
================================ */

.modern-btn:hover,
.dropdown-title:hover {
    background: rgba(255,255,255,.06);
    transform: translateX(1px);
    box-shadow: none;
}

.collapse-btn {
    width: 100%;
    min-height: 56px;
    padding: 10px 12px;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
    color: rgba(255,255,255,.94);
    margin-bottom: 14px;
    cursor: pointer;
    transition: all .25s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.collapse-btn__icon-wrap {
    width: 34px;
    height: 34px;
    min-width: 34px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(148,163,184,.22), rgba(96,165,250,.26));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.14), 0 8px 18px rgba(15,23,42,.22);
}

.collapse-btn i {
    font-size: 17px;
    transition: transform .25s ease;
}

.collapse-btn__copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.collapse-btn__title {
    font-size: 13px;
    font-weight: 700;
    line-height: 1.15;
    color: #f8fafc;
}

.collapse-btn__note {
    font-size: 11px;
    line-height: 1.25;
    color: rgba(226,232,240,.72);
}

.collapse-btn:hover {
    background: linear-gradient(135deg, rgba(255,255,255,.12), rgba(96,165,250,.08));
    border-color: rgba(255,255,255,.14);
    transform: translateY(-1px);
}

.collapse-btn:hover .collapse-btn__icon-wrap {
    background: linear-gradient(135deg, rgba(96,165,250,.35), rgba(125,211,252,.28));
}

.collapse-btn:hover i {
    transform: scale(1.08);
}

.sidebar.collapsed .collapse-btn {
    min-height: 52px;
    padding: 8px;
    justify-content: center;
    border-radius: 16px;
    gap: 0;
}

.sidebar.collapsed .collapse-btn__copy {
    display: none;
}

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

    @media (max-width: 768px) {

        .modern-hamburger {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            position: fixed;
            top: 14px;
            left: 14px;
            width: 52px;
            height: 52px;
            padding: 0;
            background: linear-gradient(180deg, rgba(51, 65, 85, 0.96), rgba(15, 23, 42, 0.94));
            border: 1px solid rgba(255,255,255,.12);
            border-radius: 18px;
            cursor: pointer;
            z-index: 1300;
            box-shadow: 0 18px 34px rgba(15, 23, 42, 0.34), inset 0 1px 0 rgba(255,255,255,.12);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease, background .22s ease;
        }

            .modern-hamburger::before {
                content: "";
                position: absolute;
                inset: 1px;
                border-radius: inherit;
                background: linear-gradient(135deg, rgba(96, 165, 250, 0.22), rgba(255,255,255,0));
                pointer-events: none;
            }

            .modern-hamburger span {
                width: 22px;
                height: 2.5px;
                background: linear-gradient(90deg, #f8fafc, #dbeafe);
                border-radius: 999px;
                display: block;
                margin-left: 0;
                position: relative;
                z-index: 1;
                box-shadow: 0 0 10px rgba(191, 219, 254, 0.18);
            }

        .modern-hamburger:hover {
            transform: translateY(-1px);
            border-color: rgba(191,219,254,.24);
            box-shadow: 0 22px 40px rgba(15, 23, 42, 0.38), inset 0 1px 0 rgba(255,255,255,.16);
        }

        .sidebar {
            transform: translateX(-100%);
            padding-top: 82px;
            z-index: 1210;
        }

            .sidebar.open {
                transform: translateX(0);
            }

        .sidebar .collapse-btn {
            margin-top: 4px;
        }

        .main-content {
            margin-left: 0 !important;
        }
    }

    /* ===== OVERLAY ===== */

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.35);
        backdrop-filter: blur(2px);
        z-index: 900;
    }