/* General Styles */
:root {
    --bg-color: #f4f7f9;
    --text-color: #333;
    --header-bg: #2c3e50;
    --header-text: #ecf0f1;
    --header-subtext: #bdc3c7;
    --main-bg: #fff;
    --footer-bg: #ecf0f1;
    --footer-text: #7f8c8d;
    --border-color: #ccc;
    --input-bg: #fff; /* Default input background */
    --input-text: #333; /* Default input text */
    --input-focus-border: #3498db;
    --input-focus-shadow: rgba(52, 152, 219, 0.2);
    --button-bg: #3498db;
    --button-text: #fff;
    --button-hover-bg: #2980b9;
    --tab-inactive-text: #7f8c8d;
    --tab-active-border: #3498db;
    --tab-active-text: #2c3e50;
    --code-bg: #2d2d2d; /* Okaidia background for code blocks/inputs */
    --code-text: #f8f8f2; /* Okaidia text color */
    --output-bg: #ecf0f1; /* Background for readonly outputs */
    --error-text: #a94442;
    --error-border: #a94442;
    --error-shadow: rgba(169, 68, 66, 0.2);
    --valid-bg: #dff0d8;
    --valid-text: #3c763d;
    --valid-border: #d6e9c6;
    --invalid-bg: #f2dede;
    --invalid-text: #a94442;
    --invalid-border: #ebccd1;
    --toggle-secret-text: #7f8c8d;
    --toggle-secret-hover: #3498db;
    --box-shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition */
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 2rem;
    text-align: center;
    width: 100%; /* Ensure header spans full width */
    box-sizing: border-box; /* Include padding in width calculation */
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

header p {
    margin: 0.5rem 0 0;
    font-size: 1rem;
    color: var(--header-subtext);
}

main {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--main-bg);
    box-shadow: 0 2px 10px var(--box-shadow-color);
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--footer-text);
    background-color: var(--footer-bg);
    width: 100%;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Tabs */
.tabs {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.tab-button {
    padding: 0.8rem 1.5rem;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 1rem;
    margin-right: 0.5rem;
    border-bottom: 3px solid transparent;
    transition: border-color 0.3s ease, color 0.3s ease;
    color: var(--tab-inactive-text);
}

.tab-button.active {
    border-bottom-color: var(--tab-active-border);
    color: var(--tab-active-text);
    font-weight: 600;
}

.tab-button:hover {
    color: var(--tab-active-border); /* Use active border color for hover */
}

.tab-content {
    display: none;
}

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

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
    position: relative; /* For positioning error messages and toggle buttons */
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color); /* Use main text color */
}

input[type="text"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
    background-color: var(--input-bg);
    color: var(--input-text);
}

/* Remove the conflicting main rule added previously */
/*
main {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 700px;
}
*/

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
    border-color: var(--input-focus-border);
    outline: none;
    box-shadow: 0 0 0 2px var(--input-focus-shadow);
}

textarea {
    resize: vertical;
    min-height: 100px;
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; /* Monospace for code */
}

/* Style the <pre> element that holds the highlighted code (used for outputs) */
pre[class*="language-"] {
    margin: 0;
    border: 1px solid var(--border-color); /* Use border color var */
    border-radius: 4px;
    padding: 0.8rem !important;
    min-height: 100px;
    background-color: var(--code-bg); /* Use code bg var */
    overflow: auto;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

pre[class*="language-"] code {
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.95rem;
    line-height: 2; /* Increased line-height */
    white-space: pre-wrap; /* Wrap long lines */
    word-break: break-all; /* Break long words/strings */
}

/* Apply code theme background/text color to input textareas */
textarea.language-json {
    background-color: var(--code-bg);
    color: var(--code-text);
    border: 1px solid var(--border-color); /* Use border color var */
}

textarea.language-json:focus {
    border-color: var(--input-focus-border);
    outline: none;
    box-shadow: 0 0 0 2px var(--input-focus-shadow);
}


button {
    padding: 0.8rem 1.5rem;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

button:hover:not(:disabled) { /* Don't change hover style if disabled */
    background-color: var(--button-hover-bg);
}

button:disabled {
    background-color: var(--tab-inactive-text); /* Use a muted color */
    cursor: not-allowed;
    opacity: 0.7;
}

/* Toggle Secret Button */
.toggle-secret {
    position: absolute;
    right: 10px;
    top: 35px;
    background: none;
    border: none;
    color: var(--toggle-secret-text);
    cursor: pointer;
    padding: 5px;
    font-size: 0.9rem;
}

.toggle-secret:hover {
    color: var(--toggle-secret-hover);
}


/* Output Areas */
.output-group {
    margin-top: 1.5rem;
}

.output-group label {
    font-weight: 600;
    color: var(--text-color); /* Use main text color */
}

#generated-jwt,
#jwt-verify {
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    background-color: var(--output-bg); /* Use output bg var */
    color: var(--input-text); /* Use input text color */
    border-color: var(--border-color);
}

#verification-status {
    margin-top: 0.5rem;
    padding: 0.8rem;
    border-radius: 4px;
    font-weight: bold;
}

#verification-status.valid {
    background-color: var(--valid-bg);
    color: var(--valid-text);
    border: 1px solid var(--valid-border);
}

#verification-status.invalid {
    background-color: var(--invalid-bg);
    color: var(--invalid-text);
    border: 1px solid var(--invalid-border);
}

#decoded-header,
#decoded-payload {
    /* These inherit from pre[class*="language-"] */
    padding: 0.8rem; /* Ensure padding is applied */
    border-radius: 4px;
    margin-top: 0.5rem;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Error Messages */
.error-message {
    color: var(--error-text);
    font-size: 0.9rem;
    margin-top: 0.3rem;
}

textarea.invalid-json {
     border-color: var(--error-border) !important;
     box-shadow: 0 0 0 2px var(--error-shadow) !important;
}

/* Responsive Design */
@media (max-width: 840px) { /* Adjust breakpoint slightly larger than max-width */
   main { /* Target main element */
        margin: 1rem; /* Reduce margin on smaller screens */
        padding: 1.5rem; /* Reduce padding slightly */
    }

    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .tab-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    button {
        padding: 0.7rem 1.2rem;
        font-size: 0.9rem;
    }

    .toggle-secret {
        top: 32px;
    }

    #theme-toggle { /* Adjust theme toggle position */
        top: 10px;
        right: 10px;
    }
}

/* --- Dark Mode --- */
body.dark-mode {
    --bg-color: #263238; /* Dark blue-grey */
    --text-color: #eceff1; /* Light grey */
    --header-bg: #1a252a; /* Darker header */
    --header-text: #fff;
    --header-subtext: #90a4ae; /* Lighter subtext */
    --main-bg: #37474f; /* Medium dark grey */
    --footer-bg: #1a252a; /* Match header */
    --footer-text: #90a4ae;
    --border-color: #546e7a; /* Grey border */
    --input-bg: #455a64; /* Darker input */
    --input-text: #eceff1;
    --input-focus-border: #64b5f6; /* Light blue focus */
    --input-focus-shadow: rgba(100, 181, 246, 0.2);
    --button-bg: #0288d1; /* Brighter blue button */
    --button-text: #fff;
    --button-hover-bg: #0277bd;
    --tab-inactive-text: #90a4ae;
    --tab-active-border: #64b5f6; /* Light blue active tab */
    --tab-active-text: #eceff1;
    /* --code-bg stays okaidia */
    /* --code-text stays okaidia */
    --output-bg: #455a64; /* Match input bg */
    --error-text: #ef9a9a; /* Light red */
    --error-border: #ef5350;
    --error-shadow: rgba(239, 83, 80, 0.2);
    --valid-bg: #388e3c; /* Dark green */
    --valid-text: #e8f5e9; /* Light green text */
    --valid-border: #2e7d32;
    --invalid-bg: #c62828; /* Dark red */
    --invalid-text: #ffcdd2; /* Light red text */
    --invalid-border: #b71c1c;
    --toggle-secret-text: #90a4ae;
    --toggle-secret-hover: #64b5f6;
    --box-shadow-color: rgba(0, 0, 0, 0.3); /* Darker shadow */
}

/* Adjust Prism theme for dark mode if needed (Okaidia is already dark) */
/* body.dark-mode pre[class*="language-"] { ... } */
/* body.dark-mode pre[class*="language-"] code { ... } */

/* Ensure copy button looks okay in dark mode */
body.dark-mode #copy-jwt-button {
    background-color: var(--toggle-secret-text); /* Use a muted color */
    color: var(--bg-color); /* Dark text on light button */
}

body.dark-mode #copy-jwt-button:hover:not(:disabled) {
     background-color: var(--toggle-secret-hover);
     color: var(--header-bg);
}

/* Ensure theme toggle button looks okay */
#theme-toggle {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: 1px solid var(--border-color);
}

body.dark-mode #theme-toggle {
     background-color: var(--input-bg);
     color: var(--input-text);
}