:root {
    --primary: #0984E3;
    --secondary: #74B9FF;
    --accent: #00CEC9;
    --bg-dark: #0A1628;
    --bg-panel: #112240;
    --bg-input: #020C1B;
    --text-main: #E2E8F0;
    --text-muted: #8892B0;
    --border-color: #233554;
    --success: #00E676;
    --error: #FF1744;
    --radius: 12px;

    --color-header: #FB3640;
    --color-payload: #D946EF;
    --color-signature: #00CEC9;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(10, 22, 40, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

.logo h1 span {
    color: var(--primary);
}

.logo svg {
    color: var(--accent);
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    color: var(--accent);
    background: rgba(0, 206, 201, 0.1);
}

/* Main Layout */
.main-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.grid-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    height: 100%;
}

@media (max-width: 900px) {
    .grid-split {
        grid-template-columns: 1fr;
        height: auto;
    }
}

.panel {
    background: var(--bg-panel);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.panel-header {
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header span {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 400;
}

.hidden {
    display: none !important;
}

.mt-4 {
    margin-top: 1rem;
}

.mt-6 {
    margin-top: 1.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.padding-sm {
    padding: 1rem !important;
}

.block {
    display: block;
    width: 100%;
}

/* JWT Input Area */
.editor-container {
    flex: 1;
    position: relative;
    background: var(--bg-input);
    display: flex;
    flex-direction: column;
}

.encoded-textarea-wrap {
    position: relative;
    flex: 1;
    overflow: hidden;
}

.code-textarea {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    color: transparent;
    /* Text is transparent, caret is visible */
    caret-color: var(--text-main);
    border: none;
    padding: 1.5rem;
    font-family: 'Fira Code', monospace;
    font-size: 1.25rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    z-index: 2;
    word-break: break-all;
}

/* For non-overlay textareas */
textarea.code-textarea:not(#jwt-input) {
    position: relative;
    color: var(--text-main);
}

.colored-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 1.5rem;
    font-family: 'Fira Code', monospace;
    font-size: 1.25rem;
    line-height: 1.6;
    z-index: 1;
    word-break: break-all;
    white-space: pre-wrap;
    pointer-events: none;
}

.color-header {
    color: var(--color-header);
}

.color-payload {
    color: var(--color-payload);
}

.color-signature {
    color: var(--color-signature);
}

.color-dot {
    color: var(--text-main);
}

/* Decoded Sections */
.decoded-sections {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-input);
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.flex-between {
    justify-content: space-between;
}

.text-header {
    color: var(--color-header);
}

.text-payload {
    color: var(--color-payload);
}

.text-signature {
    color: var(--color-signature);
}

.alg-badge {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
}

.json-textarea {
    width: 100%;
    min-height: 120px;
    background: transparent;
    border: none;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

.signature-box {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.secret-input {
    background: transparent;
    border: none;
    border-bottom: 1px dashed var(--color-signature);
    color: var(--color-signature);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    outline: none;
    padding: 0.2rem;
    width: 250px;
}

.verification-status {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 6px;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    background: var(--border-color);
    color: var(--text-main);
    transition: all 0.3s;
}

.verification-status.valid {
    background: rgba(0, 230, 118, 0.1);
    color: var(--success);
    border: 1px solid rgba(0, 230, 118, 0.3);
}

.verification-status.invalid {
    background: rgba(255, 23, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(255, 23, 68, 0.3);
}

/* Claims Explanations */
.claims-explanation {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px dashed var(--border-color);
    padding-top: 1rem;
}

.claim-row {
    display: flex;
    margin-bottom: 0.5rem;
}

.claim-key {
    font-weight: 600;
    color: var(--accent);
    width: 50px;
}

/* Expiry Badge */
.expiry-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-main);
}

.expiry-badge.expired {
    background: rgba(255, 23, 68, 0.2);
    color: var(--error);
}

/* Issue View */
.generator-container {
    max-width: 800px;
    margin: 0 auto;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: #0873C4;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.generator-output {
    background: var(--bg-input);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-family: 'Fira Code', monospace;
    word-break: break-all;
    color: var(--text-main);
    min-height: 100px;
}

.json-viewer {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-main);
    background: var(--bg-input);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
}