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

:root {
    --bg-gradient-start: #e8f5e9;
    --bg-gradient-end: #ffffff;
    --card-bg: #ffffff;
    --text-primary: #1b5e20;
    --text-secondary: #2e7d32;
    --text-header: #1b5e20;
    --border-color: #4caf50;
    --input-bg: #f1f8f4;
    --button-bg: linear-gradient(135deg, #43a047 0%, #66bb6a 100%);
    --toggle-bg: #f1f8f4;
    --toggle-border: #4caf50;
    --header-text: #1b5e20;
    --shadow-color: rgba(76, 175, 80, 0.2);
}

body.dark-theme {
    --bg-gradient-start: #000000;
    --bg-gradient-end: #0a0a0a;
    --card-bg: #1a1a1a;
    --text-primary: #00ff00;
    --text-secondary: #33ff33;
    --text-header: #00ff00;
    --border-color: #00ff00;
    --input-bg: #0d0d0d;
    --button-bg: linear-gradient(135deg, #00cc00 0%, #00ff00 100%);
    --toggle-bg: #1a1a1a;
    --toggle-border: #00ff00;
    --header-text: #00ff00;
    --shadow-color: rgba(0, 255, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px var(--shadow-color);
    z-index: 1000;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 15px var(--shadow-color);
}

.theme-toggle .sun-icon {
    display: block;
    color: var(--text-primary);
}

.theme-toggle .moon-icon {
    display: none;
    color: var(--text-primary);
}

body.dark-theme .theme-toggle .sun-icon {
    display: none;
}

body.dark-theme .theme-toggle .moon-icon {
    display: block;
}

header {
    text-align: center;
    color: var(--header-text);
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

.input-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow-color);
    margin-bottom: 30px;
    transition: background 0.3s ease;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.paste-btn {
    flex: 1;
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.paste-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.paste-btn:active {
    transform: translateY(0);
}

.toggle-btn {
    background: var(--toggle-bg);
    border: 2px solid var(--toggle-border);
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.toggle-btn:hover {
    background: #e0e0e0;
    border-color: #667eea;
    color: #667eea;
}

.toggle-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

.textbox-container {
    overflow: hidden;
    transition: max-height 0.3s ease-out, opacity 0.3s;
    max-height: 0;
    opacity: 0;
}

.textbox-container.visible {
    max-height: 400px;
    opacity: 1;
}

.textbox-container.hidden {
    max-height: 0;
    opacity: 0;
}

#headersInput {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    margin-bottom: 15px;
    background: var(--input-bg);
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

#headersInput:focus {
    outline: none;
    border-color: #667eea;
}

.analyze-btn {
    background: #10b981;
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.analyze-btn:hover {
    background: #059669;
}

.results {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: background 0.3s ease;
}

.results.hidden {
    display: none;
}

.security-summary,
.sender-info,
.relay-timeline,
.all-headers {
    margin-bottom: 30px;
}

.security-summary h2,
.sender-info h2,
.relay-timeline h2,
.all-headers h2 {
    color: #4caf50;
    margin-bottom: 15px;
    font-size: 1.5rem;
    border-bottom: 2px solid #4caf50;
    padding-bottom: 10px;
}

body.dark-theme .security-summary h2,
body.dark-theme .sender-info h2,
body.dark-theme .relay-timeline h2,
body.dark-theme .all-headers h2 {
    color: #00ff00;
    border-bottom-color: #00ff00;
}

.security-checks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.security-check {
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--border-color);
    transition: background 0.3s ease;
    background: #f9fafb;
}

.security-check.pass {
    border-left-color: #10b981;
    background: #ecfdf5;
}

body.dark-theme .security-check.pass {
    background: #0a3d2a;
    border-left-color: #00ff00;
}

.security-check.fail {
    border-left-color: #ef4444;
    background: #fef2f2;
}

body.dark-theme .security-check.fail {
    background: #3d0a0a;
    border-left-color: #ff0000;
}

.security-check.warning {
    border-left-color: #f59e0b;
    background: #fffbeb;
}

body.dark-theme .security-check.warning {
    background: #3d2a0a;
    border-left-color: #ffaa00;
}

.security-check.neutral {
    border-left-color: #6b7280;
    background: #f9fafb;
}

body.dark-theme .security-check.neutral {
    background: #0d0d0d;
    border-left-color: #00ff00;
}

.check-label {
    font-weight: 600;
    margin-bottom: 5px;
    text-transform: uppercase;
    font-size: 0.85rem;
    color: var(--text-header);
}

.check-value {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.info-grid {
    display: grid;
    gap: 15px;
}

.info-item {
    padding: 12px 15px;
    background: var(--input-bg);
    border-radius: 8px;
    border-left: 3px solid #667eea;
    transition: background 0.3s ease;
}

.info-item.important {
    background: #fef3c7;
    border-left-color: #f59e0b;
}

body.dark-theme .info-item.important {
    background: #3d2a0a;
    border-left-color: #ffaa00;
}

.info-item.suspicious {
    background: #fee2e2;
    border-left-color: #ef4444;
}

body.dark-theme .info-item.suspicious {
    background: #3d0a0a;
    border-left-color: #ff0000;
}

.info-label {
    font-weight: 700;
    color: var(--text-header);
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.info-value {
    color: var(--text-secondary);
    word-break: break-all;
}

.info-value.bold {
    font-weight: 700;
    color: var(--text-header);
}

.headers-list {
    display: grid;
    gap: 10px;
}

.header-item {
    padding: 10px 15px;
    background: var(--input-bg);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    transition: background 0.3s ease;
}

.header-item.important {
    background: #dbeafe;
    border-left: 3px solid #3b82f6;
}

body.dark-theme .header-item.important {
    background: #0a2a3d;
    border-left: 3px solid #00aaff;
}

.header-item.suspicious {
    background: #fee2e2;
    border-left: 3px solid #ef4444;
}

body.dark-theme .header-item.suspicious {
    background: #3d0a0a;
    border-left: 3px solid #ff0000;
}

.header-name {
    font-weight: 700;
    color: var(--text-header);
    margin-right: 10px;
}

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

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-header);
}

.empty-state.hidden {
    display: none;
}

.empty-state svg {
    opacity: 0.7;
    margin-bottom: 20px;
}

.empty-state p {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.empty-state .hint {
    font-size: 0.95rem;
    opacity: 0.8;
}

/* Timeline Styles */
.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline-item {
    position: relative;
    padding: 20px 20px 20px 50px;
    margin-bottom: 20px;
    background: var(--input-bg);
    border-radius: 8px;
    border-left: 4px solid #4caf50;
    transition: background 0.3s ease, transform 0.2s ease;
}

body.dark-theme .timeline-item {
    border-left-color: #00ff00;
}

.timeline-item:hover {
    transform: translateX(5px);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 18px;
    top: 25px;
    width: 16px;
    height: 16px;
    background: #4caf50;
    border: 3px solid var(--card-bg);
    border-radius: 50%;
    z-index: 1;
}

body.dark-theme .timeline-item::before {
    background: #00ff00;
}

.timeline-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 25px;
    top: 45px;
    width: 2px;
    height: calc(100% + 20px);
    background: #4caf50;
    opacity: 0.3;
}

body.dark-theme .timeline-item:not(:last-child)::after {
    background: #00ff00;
}

.timeline-item.first-hop {
    border-left-color: #43a047;
}

body.dark-theme .timeline-item.first-hop {
    border-left-color: #00ff00;
    background: #0a3d0a;
}

.timeline-item.first-hop::before {
    background: #43a047;
    width: 20px;
    height: 20px;
    left: 16px;
}

body.dark-theme .timeline-item.first-hop::before {
    background: #00ff00;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 10px;
}

.timeline-number {
    display: inline-block;
    background: #4caf50;
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 8px;
}

body.dark-theme .timeline-number {
    background: #00ff00;
    color: #000000;
}

.timeline-time {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.timeline-server {
    font-weight: 700;
    color: var(--text-header);
    font-size: 1rem;
    margin-bottom: 8px;
}

.timeline-details {
    display: grid;
    gap: 5px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.timeline-detail-row {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 10px;
}

.timeline-detail-label {
    font-weight: 600;
    color: var(--text-header);
}

.timeline-detail-value {
    word-break: break-all;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .timeline-item {
        padding-left: 40px;
    }
    
    .timeline-item::before {
        left: 12px;
        width: 12px;
        height: 12px;
    }
    
    .timeline-item:not(:last-child)::after {
        left: 17px;
    }
    
    .timeline-detail-row {
        grid-template-columns: 1fr;
        gap: 2px;
    }
    
    .input-section,
    .results {
        padding: 20px;
    }
    
    .security-checks {
        grid-template-columns: 1fr;
    }
}