:root {
    --primary: #4e54c8;
    --secondary: #8f94fb;
    --accent: #ff6b6b;
    --light: #f8f9fa;
    --dark: #343a40;
    --success: #28a745;
    --warning: #ffc107;
    --info: #17a2b8;
    
    /* Dark theme variables */
    --bg-dark: #1a1a2e;
    --card-dark: #16213e;
    --text-dark: #e6e6e6;
    --border-dark: #0f3460;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--dark);
    min-height: 100vh;
    padding: 20px;
}

body.dark-theme {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--card-dark) 100%);
    color: var(--text-dark);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    animation: fadeIn 0.5s ease-in-out;
}

body.dark-theme .container {
    background: rgba(25, 25, 35, 0.9);
}

header {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    padding: 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

body.dark-theme header {
    background: linear-gradient(to right, #0f3460, #1a1a2e);
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100" opacity="0.1"><path d="M20,20 L80,20 L80,80 L20,80 Z" fill="none" stroke="white" stroke-width="2"/></svg>');
    animation: float 6s ease-in-out infinite;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.main-content {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
    gap: 20px;
}

.controls {
    flex: 1;
    min-width: 350px;
    padding: 20px;
    background: var(--light);
    border-radius: 10px;
    margin-bottom: 20px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    animation: slideInLeft 0.5s ease-out;
}

body.dark-theme .controls {
    background: var(--card-dark);
    color: var(--text-dark);
}

.preview {
    flex: 2;
    min-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: slideInRight 0.5s ease-out;
}

.control-group {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

body.dark-theme .control-group {
    border-bottom: 1px solid var(--border-dark);
}

.control-group h3 {
    margin-bottom: 15px;
    color: var(--primary);
    border-bottom: 2px solid var(--secondary);
    padding-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

body.dark-theme .control-group h3 {
    color: #8f94fb;
    border-bottom: 2px solid #4e54c8;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

body.dark-theme label {
    color: var(--text-dark);
}

input, textarea, select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: all 0.3s;
    background: white;
}

body.dark-theme input, 
body.dark-theme textarea, 
body.dark-theme select {
    background: #2d3041;
    border: 2px solid #444;
    color: var(--text-dark);
}

input:focus, textarea:focus, select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(78, 84, 200, 0.2);
}

body.dark-theme input:focus, 
body.dark-theme textarea:focus, 
body.dark-theme select:focus {
    border-color: #8f94fb;
    box-shadow: 0 0 0 3px rgba(143, 148, 251, 0.2);
}

textarea {
    min-height: 100px;
    resize: vertical;
}

.color-picker {
    display: flex;
    gap: 10px;
}

.color-picker input {
    flex: 1;
    padding: 3px;
    height: 50px;
    cursor: pointer;
}

.btn {
    padding: 12px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    background: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.btn i {
    font-size: 18px;
}

.btn-group {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.btn-export {
    background: var(--accent);
}

.btn-export:hover {
    background: #ff5252;
}

.btn-reset {
    background: var(--dark);
}

body.dark-theme .btn-reset {
    background: #555;
}

.btn-theme {
    background: var(--info);
}

.btn-theme:hover {
    background: #138496;
}

#certificate {
    width: 210mm;
    height: 297mm;
    background: white;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
    padding: 40px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}

body.dark-theme #certificate {
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.cert-border {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 5px solid var(--primary);
    border-radius: 5px;
    pointer-events: none;
    transition: all 0.3s;
}

.cert-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.05;
    pointer-events: none;
    transition: all 0.3s;
}

.cert-content {
    position: relative;
    z-index: 1;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.cert-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.logo-left, .logo-center, .logo-right {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 120px;
}

.logo-left {
    justify-content: flex-start;
}

.logo-right {
    justify-content: flex-end;
}

.cert-logo {
    max-width: 120px;
    max-height: 120px;
    object-fit: contain;
    transition: transform 0.3s;
}

.cert-logo:hover {
    transform: scale(1.05);
}

.cert-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px 0;
}

.cert-title {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0;
    color: var(--primary);
    transition: all 0.3s;
    animation: pulse 2s infinite;
}

.cert-subtitle {
    font-size: 24px;
    margin-bottom: 30px;
    color: var(--secondary);
    transition: all 0.3s;
}

.cert-body {
    font-size: 18px;
    line-height: 1.6;
    margin: 30px 0;
    padding: 20px;
    border-radius: 10px;
    background: rgba(248, 249, 250, 0.7);
    transition: all 0.3s;
}

body.dark-theme .cert-body {
    background: rgba(45, 48, 65, 0.7);
}

.recipient-name {
    font-size: 36px;
    font-weight: bold;
    margin: 20px 0;
    color: var(--dark);
    padding: 10px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

body.dark-theme .recipient-name {
    color: var(--text-dark);
    border-bottom: 2px solid var(--secondary);
}

.body-text {
    margin: 30px 0;
    text-align: center;
    max-width: 80%;
    margin-left: auto;
    margin-right: auto;
}

.cert-date {
    font-size: 20px;
    font-weight: bold;
    margin-top: 20px;
}

.cert-signature {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
}

.signature-box {
    text-align: center;
    flex: 1;
    padding: 0 20px;
}

.signature-img {
    max-width: 200px;
    max-height: 80px;
    margin-bottom: 10px;
    transition: transform 0.3s;
}

.signature-img:hover {
    transform: scale(1.05);
}

.signature-line {
    width: 200px;
    border-top: 2px solid var(--dark);
    margin: 5px auto;
}

body.dark-theme .signature-line {
    border-top: 2px solid var(--text-dark);
}

.signature-name {
    font-weight: bold;
    margin-top: 10px;
}

.signature-title {
    font-style: italic;
    color: #666;
}

body.dark-theme .signature-title {
    color: #aaa;
}

.export-options {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.template-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.template {
    height: 60px;
    border: 2px solid #ddd;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.template:hover {
    transform: scale(1.05);
    border-color: var(--primary);
}

.template-1 { background: linear-gradient(135deg, #4e54c8 0%, #8f94fb 100%); }
.template-2 { background: linear-gradient(135deg, #ff6b6b 0%, #ff8e8e 100%); }
.template-3 { background: linear-gradient(135deg, #36d1dc 0%, #5b86e5 100%); }
.template-4 { background: linear-gradient(135deg, #f46b45 0%, #eea849 100%); }
.template-5 { background: linear-gradient(135deg, #8e2de2 0%, #4a00e0 100%); }
.template-6 { background: linear-gradient(135deg, #3a7bd5 0%, #00d2ff 100%); }

footer {
    text-align: center;
    padding: 20px;
    background: var(--dark);
    color: white;
}

body.dark-theme footer {
    background: #0f0f1a;
}

/* Font Classes */
.font-old-english {
    font-family: 'UnifrakturMaguntia', cursive;
}

.font-cinzel {
    font-family: 'Cinzel', serif;
}

.font-almendra {
    font-family: 'Almendra', serif;
}

.font-medieval {
    font-family: 'MedievalSharp', cursive;
}

.font-playfair {
    font-family: 'Playfair Display', serif;
}

.font-old-standard {
    font-family: 'Old Standard TT', serif;
}

.font-modern {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.font-elegant {
    font-family: 'Georgia', serif;
}

.font-dancing {
    font-family: 'Dancing Script', cursive;
}

.font-great-vibes {
    font-family: 'Great Vibes', cursive;
}

.font-parisienne {
    font-family: 'Parisienne', cursive;
}

.font-rouge {
    font-family: 'Rouge Script', cursive;
}

.font-tangerine {
    font-family: 'Tangerine', cursive;
}

/* Border Styles */
.border-solid {
    border-style: solid !important;
}

.border-dotted {
    border-style: dotted !important;
}

.border-dashed {
    border-style: dashed !important;
}

.border-double {
    border-style: double !important;
    border-width: 8px !important;
}

.border-ornate {
    border-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M20,20 L80,20 L80,80 L20,80 Z" fill="none" stroke="%234e54c8" stroke-width="2"/><circle cx="50" cy="20" r="5" fill="%234e54c8"/><circle cx="20" cy="50" r="5" fill="%234e54c8"/><circle cx="80" cy="50" r="5" fill="%234e54c8"/><circle cx="50" cy="80" r="5" fill="%234e54c8"/></svg>') 30 round !important;
    border-width: 15px !important;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from { transform: translateX(-50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideInRight {
    from { transform: translateX(50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Moving Icons */
.moving-icon {
    animation: float 3s ease-in-out infinite;
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.3s, box-shadow 0.3s;
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        flex-direction: column;
    }
    
    .controls {
        margin-right: 0;
        max-height: none;
    }
    
    #certificate {
        width: 100%;
        height: auto;
        aspect-ratio: 210 / 297;
    }
    
    .cert-header {
        flex-direction: column;
        gap: 20px;
    }
    
    .logo-left, .logo-center, .logo-right {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .cert-title {
        font-size: 36px;
    }
    
    .cert-subtitle {
        font-size: 20px;
    }
    
    .recipient-name {
        font-size: 28px;
    }
    
    .cert-body {
        font-size: 16px;
    }
    
    .export-options {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    .cert-title {
        font-size: 28px;
    }
    
    .cert-signature {
        flex-direction: column;
        gap: 30px;
    }
    
    .cert-header {
        margin-bottom: 10px;
    }
    
    .cert-logo {
        max-width: 80px;
        max-height: 80px;
    }
}