* { box-sizing: border-box; }

body, html {
    height: 100dvh;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #333;
    color: #fff;
    overflow: hidden;
}

body.light-theme {
    background: #f0f4f8;
    color: #222;
}

.sidebar {
    position: fixed;
    top: 0;
    height: 100dvh;
    overflow-y: auto;
    z-index: 10;
    display: flex;
    flex-direction: column;
    padding: 0;
    color: #222;
    transition: transform 0.3s ease-in-out;
}

.sidebar.left {
    left: 0;
    width: 400px;
    background: rgb(111, 53, 247);
    border-right: none;
    display: flex;
    flex-direction: column;
}
.sidebar.right {
    right: 0;
    width: 400px;
    background: #7ed9d9;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.sidebar.left.hidden {
    transform: translateX(-100%);
}

.sidebar.right.hidden {
    transform: translateX(100%);
}

.sidebar-toggle {
    position: fixed;
    top: 8px;
    z-index: 220;
    border: none;
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 18px;
    background: rgb(111, 53, 247);
    color: #fff;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.sidebar-toggle.left {
    left: 8px;
}

.sidebar-toggle.right {
    right: 8px;
    background: #7ed9d9;
    color: #222;
}
.unitati-box {
    background: rgb(241, 145, 66);
    padding: 10px 10px 0 10px;
    flex: 1;
}
.unitati-list {
    background: #fff9d6;
    color: #222;
    border: none;
    border-radius: 4px;
    padding: 10px;
    margin-bottom: 10px;
    height: calc(100% - 50px);
    overflow-y: auto;
}
.formule-box {
    background: rgb(124, 88, 209);
    padding: 10px 10px 0 10px;
    flex: 1;
}
.formule-list {
    background: #fff9d6;
    color: #222;
    border: none;
    border-radius: 4px;
    height: calc(100% - 30px);
    overflow-y: auto;
}
#themeSwitcher {
    margin: 0;
    padding: 8px 16px;
    background: #fff;
    color: #333;
    border: 1px solid #bbb;
    border-radius: 0;
    cursor: pointer;
    font-size: 1em;
    transition: background 0.2s;
    width: 100%;
}
#themeSwitcher:hover {
    background: #eee;
}

.main-sim-area {
    box-sizing: border-box;
    width: 100%;
    min-height: 100dvh;
    padding: 58px 12px 12px;
    height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    background: transparent;
}

h1 {
    color: #fff;
    font-size: 2.7em;
    margin-top: 30px;
    margin-bottom: 10px;
    text-align: center;
    font-family: 'Georgia', serif;
    letter-spacing: 2px;
}
body.light-theme h1 {
    color: #222;
}

.spring-visual {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    background: transparent;
    min-height: 400px;
    height: 400px;
    margin-top: 10px;
    overflow: visible;
    position: relative;
    width: 100%;
}
#springSVG {
    width: 400px;
    height: 400px;
    background: transparent;
    overflow: visible;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.controls-box {
    background: #7ed9d9;
    padding: 12px 18px 10px 18px;
    font-size: 1.1em;
}
.controls-box label {
    display: block;
    width: 100%;
    color: #222;
    margin-bottom: 5px;
    font-weight: normal;
}
.controls-box label span {
    float: right;
    color: #000000;
}
.controls-box input[type="range"] {
    width: 100%;
    margin: 0 0 15px 0;
    height: 20px;
}
.controls-box button {
    display: block;
    width: 100%;
    margin: 8px 0;
    padding: 8px 0;
    font-size: 1em;
    background: #fff9d6;
    color: #222;
    border: 1px solid #222;
    border-radius: 6px;
    cursor: pointer;
}
.controls-box button:hover {
    background: #fff9d6;
}
#pauseResumeBtn.paused {
    background: #fff9d6;
    color: #222;
}
#pauseResumeBtn.paused:hover {
    background: #fff9d6;
}

.masuratori-container {
    background: #fff9d6;
    border: 1px solid #000000;
    border-radius: 4px;
    margin: 10px;
}

.masuratori-box {
    background: #fff9d6;
    color: #222;
    border: none;
    border-radius: 0;
    padding: 10px 14px;
    margin: 0;
    font-size: 1em;
}

.chart-box {
    background: #fff9d6;
    border: none;
    border-radius: 0;
    margin: 0;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
    min-height: 300px;
}

#chartHooke {
    background: #fff9d6;
    border-radius: 0;
    width: 100% !important;
    height: 100% !important;
    min-height: 300px;
}

.unitati-list ul,
.formule-list ul,
.masuratori-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.unitati-list li,
.formule-list li,
.masuratori-box li {
    padding: 10px 0;
}

.formule-list li {
    padding: 0.3px 0;
    margin: 0;
    line-height: 1;
    text-align: left;
}

.formule-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.MathJax {
    text-align: left !important;
}

.slider-container {
    margin-bottom: 15px;
}

.friction-btn {
    display: block;
    width: 100%;
    margin: 5px 0;
    padding: 6px 0;
    font-size: 0.9em;
    background: #fff9d6;
    color: #222;
    border: 1px solid #222;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.friction-btn:hover {
    background: #fff0b3;
}

.friction-btn.active {
    background: #ffe066;
    font-weight: bold;
}

@media (max-width: 1200px) {
    .sidebar.left {
        width: 300px;
    }
    .sidebar.right {
        width: 300px;
    }
    .main-sim-area { padding-top: 58px; }
    #springSVG {
        width: 350px;
    }
    h1 {
        font-size: 2.3em;
        margin-top: 20px;
        padding: 0 15px;
        line-height: 1.3;
    }
}
@media (max-width: 1600px) {
    .sidebar.left {
        width: 370px;
    }
    .sidebar.right {
        width: 370px;
    }
    .main-sim-area { padding-top: 58px; }
    #springSVG {
        width: 400px;
    }
    h1 {
        font-size: 2em;
        margin-top: 25px;
        padding: 0 20px;
        line-height: 1.3;
    }
}
@media (max-width: 900px) {
    .sidebar.left, .sidebar.right {
        width: min(86vw, 320px);
    }
    .main-sim-area { padding-top: 62px; }
    #springSVG {
        width: 300px;
    }
    h1 {
        font-size: 1.8em;
        margin-top: 15px;
        padding: 0 10px;
        letter-spacing: 1px;
        width: 100%;
        text-align: center;
    }
} 

@media (max-width: 640px) {
    .spring-visual {
        min-height: 330px;
        height: 330px;
    }
    #springSVG {
        width: min(360px, 94vw);
        left: 50%;
        transform: translateX(-50%);
    }
    h1 {
        font-size: 1.95em;
        margin-top: 14px;
    }
}