/* Reset default styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS variables */
:root {
    --primary: #ec0c0c;
    --secondary: #000000;
    --accent: #ff6b6b;
    --bg-light: #ff3103;
    --bg-white: #ffffff;
    --text-dark: #333333;
    --text-muted: #0a0a0a;
    --border-light: #0d0d0d;
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.815);
}

/* Body */
body {
    font-family: 'Segoe UI', 'Roboto', 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--bg-light), #a6b8f5);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Container */
.container {
    max-width: 1000px;
    width: 100%;
    background: linear-gradient(235deg,#f8ef88, #05f0f4);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin: 20px auto;
    text-align: center;
}

/* Logo */
.logo {
    max-width: 120px;
    margin-bottom: 0px;
}

/* Main heading (SANKET) */
h1 {
    font-size: 3.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0;
    margin-bottom: 0;
    background: linear-gradient(250deg, #000000, #ff0000);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-family: 'Poppins', 'Montserrat', sans-serif;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease;
}

h1:hover {
    background: linear-gradient(250deg, #ff0000, #1900fa);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Subheading (Full form) */
h3 {
    color: #1500ff;
    font-size: 1.8rem;
    font-family: 'Dancing Script', cursive; /* Cursive font */
    font-weight: 400;
    margin-top: 0; /* Minimal spacing above h3 */
    margin-bottom: 0px;
}

h4 {
    color: #000000;
    font-size: 1.2rem;
    font-family: 'Verdana', Fantasy; /* Cursive font */
    font-weight: 400;
    margin-top: 0; /* Minimal spacing above h3 */
    margin-bottom: 20px;
}

/* Section headings */
h2 {
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 15px;
    text-transform: uppercase;
}

/* Form */
#spmForm {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Form row for side-by-side sections */
.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* Form section */
.form-section {
    flex: 1;
    min-width: 300px;
}

/* Box */
.box {
    background: linear-gradient(145deg, #ffffff, #85b3f1);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: 10px;
    box-shadow: 0 4px 12px rgba(33, 2, 232, 0.595);
    transition: transform 0.3s, box-shadow 0.3s;
}

.box:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* Form group */
.form-group {
    margin-bottom: 25px;
}

/* Label */
label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    display: block;
    margin-bottom: 6px;
}

/* Inputs and selects */
input[type="text"],
input[type="datetime-local"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-dark);
    background: #f9faff;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus,
input[type="datetime-local"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(30, 144, 255, 0.2);
}

input[readonly] {
    background: #e8ecef;
    cursor: not-allowed;
    color: var(--text-muted);
}

/* File input */
input[type="file"] {
    padding: 12px;
    border: 1px dashed var(--primary);
    border-radius: 8px;
    background: #f9faff;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-dark);
}

input[type="file"]::-webkit-file-upload-button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

input[type="file"]::-webkit-file-upload-button:hover {
    background: #1565c0;
}

/* Submit button */
button[type="submit"] {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    padding: 16px;
    background: linear-gradient(90deg, var(--primary), #0288d1);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(30, 144, 255, 0.3);
    text-transform: uppercase;
}

button[type="submit"]:hover {
    background: linear-gradient(90deg, #0288d1, var(--primary));
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(30, 144, 255, 0.4);
}

button[type="submit"]:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(30, 144, 255, 0.2);
}

/* Responsive design */
@media (max-width: 767px) {
    .container {
        padding: 20px;
        margin: 10px;
    }

    h1 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .form-row {
        flex-direction: column;
        gap: 15px;
    }

    .form-section {
        min-width: 100%;
    }

    input[type="text"],
    input[type="datetime-local"],
    select,
    button[type="submit"] {
        font-size: 0.95rem;
        padding: 10px;
    }

    label {
        font-size: 0.9rem;
    }

    .box {
        padding: 15px;
    }

    button[type="submit"] {
        padding: 12px;
        font-size: 1.1rem;
    }
}

/* Required field indicator */
label[for]::after {
    content: '*';
    color: var(--accent);
    margin-left: 4px;
    font-size: 0.9rem;
}

label[for="spmFile"]::after {
    content: none;
}

/* Error state */
input.error,
select.error {
    border-color: var(--accent);
    background: #fff2f2;
}

/* Hidden canvas */
#speedChart {
    display: none;
}