:root {
    --primary-color: #000000;
    --secondary-color: #f0f0f0;
    --accent-color: #00cc99;
    --background-color: #ffffff;
    --text-color: #333333;
    --border-color: #e0e0e0;
    --error-color: #e74c3c;
    --success-color: #00cc99;
    --warning-color: #f39c12;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.0rem;
    font-size: 2rem;
    font-weight: bold;
}

.logo-icon {
    height: 300px;
    width: 300px;
    object-fit: contain;
}

.tagline {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: #666;
    max-width: 600px;
    line-height: 1.6;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.9rem 1.8rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background: #333;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
}

.btn-primary i {
    font-size: 1.2rem;
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    padding: 0.7rem 1.3rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: #f8f8f8;
    border-color: var(--accent-color);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--background-color);
    border-radius: 14px;
    width: 95%;
    max-width: 500px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    position: relative;
    animation: modalIn 0.4s ease-out;
    overflow-y: auto;
    max-height: 95vh;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    margin-bottom: 1.2rem;
    text-align: center;
    position: relative;
}

.modal-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    padding: 0 2rem;
}

.modal-subtitle {
    color: #666;
    font-size: 0.95rem;
    margin-top: 0.4rem;
}

.close-modal {
    position: absolute;
    top: -0.8rem;
    right: -0.8rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    font-size: 1.1rem;
    transition: var(--transition);
    z-index: 10;
}

.close-modal:hover {
    transform: rotate(90deg);
}

.input-group {
    margin-bottom: 1.2rem;
    position: relative;
}

.input-label {
    display: block;
    margin-bottom: 0.4rem;
    text-align: left;
    font-weight: 500;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-label span {
    font-weight: normal;
    font-size: 0.82rem;
    color: #888;
}

.seed-input-container {
    position: relative;
}

#seed-phrase {
    width: 100%;
    padding: 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    line-height: 1.6;
    min-height: 150px;
    resize: vertical;
    transition: border-color 0.3s;
}

#seed-phrase:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(0, 204, 153, 0.2);
}

.word-counter {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem 0.7rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.toggle-visibility {
    position: absolute;
    bottom: 0.8rem;
    right: 0.8rem;
    background: none;
    border: none;
    color: #777;
    cursor: pointer;
    font-size: 1.1rem;
    transition: color 0.3s;
}

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

.word-hints {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.4rem;
    justify-content: center;
}

.word-hint {
    background: var(--secondary-color);
    color: var(--text-color);
    padding: 0.25rem 0.7rem;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.actions {
    display: flex;
    gap: 0.8rem;
    margin-top: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
}

#qr-container {
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
    width: 100%;
}

.qr-wrapper {
    background: white;
    padding: 1.2rem;
    border-radius: 14px;
    box-shadow: var(--card-shadow);
    border: 2px solid var(--accent-color);
    max-width: 100%;
    position: relative;
}

#qr-canvas {
    max-width: 100%;
    width: 220px;
    height: 220px;
}

.qr-actions {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.2rem;
}

.security-note {
    background: rgba(0, 204, 153, 0.1);
    padding: 0.9rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    text-align: left;
    font-size: 0.85rem;
    margin-top: 1.2rem;
    line-height: 1.5;
}

.security-note i {
    color: var(--accent-color);
    margin-right: 0.4rem;
}

.password-section {
    margin-top: 1.2rem;
    animation: fadeIn 0.5s ease;
}

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

.password-input-container {
    position: relative;
    margin-bottom: 1.2rem;
}

.password-input {
    width: 100%;
    padding: 0.9rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    padding-right: 3rem;
}

.password-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.password-toggle {
    position: absolute;
    right: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #777;
    cursor: pointer;
    font-size: 1.1rem;
}

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

.password-strength {
    height: 6px;
    background: #eee;
    border-radius: 3px;
    margin-top: 0.4rem;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.password-strength-text {
    font-size: 0.82rem;
    margin-top: 0.25rem;
    text-align: left;
    color: #666;
}

.generate-password-btn {
    background: rgba(0, 0, 0, 0.05);
    border: 1px dashed var(--border-color);
    color: #666;
    padding: 0.7rem;
    border-radius: 8px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.4rem;
}

.generate-password-btn:hover {
    background: rgba(0, 204, 153, 0.05);
    border-color: var(--accent-color);
}

footer {
    text-align: center;
    padding: 1.5rem 1rem;
    color: #777;
    font-size: 0.85rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    background: #f8f9fa;
    width: 100%;
}

.toast {
    position: fixed;
    bottom: 1.2rem;
    right: 1.2rem;
    background: var(--background-color);
    color: var(--text-color);
    padding: 0.7rem 1.3rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 0.7rem;
    z-index: 2000;
    transform: translateX(150%);
    transition: transform 0.3s ease;
    max-width: 300px;
    border-left: 4px solid var(--accent-color);
}

.toast.show {
    transform: translateX(0);
}

.toast i {
    font-size: 1.3rem;
    color: var(--accent-color);
}

.toast.error {
    border-left-color: var(--error-color);
}

.toast.error i {
    color: var(--error-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.success i {
    color: var(--success-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

.toast.warning i {
    color: var(--warning-color);
}

.hushbox-compatible {
    position: absolute;
    top: 4px;
    right: 8px;
    background: rgba(0, 204, 153, 0.1);
    color: var(--accent-color);
    padding: 0.25rem 0.7rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    z-index: 10;
}

.decrypt-section {
    width: 100%;
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: white;
    border-radius: 14px;
    box-shadow: var(--card-shadow);
    border: 2px dashed var(--accent-color);
    text-align: center;
}

.decrypt-title {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.drop-area {
    width: 100%;
    min-height: 160px;
    padding: 1.5rem;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    background: rgba(0, 204, 153, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.drop-area:hover, .drop-area.drag-over {
    background: rgba(0, 204, 153, 0.1);
    border-color: var(--accent-color);
}

.drop-area i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.drop-area p {
    font-size: 1rem;
    color: #666;
}

.drop-area .small {
    font-size: 0.85rem;
    color: #888;
}

#decrypted-modal .modal-content {
    max-width: 500px;
}

.seed-words {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.6rem;
    margin: 1.2rem 0;
}

.seed-word {
    background: var(--secondary-color);
    padding: 0.7rem;
    border-radius: 6px;
    text-align: center;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    font-size: 0.9rem;
}

.seed-word::before {
    content: attr(data-index);
    position: absolute;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.1);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    border-bottom-right-radius: 6px;
}

#welcome-modal .modal-content {
    max-width: 550px;
    padding: 1.3rem;
}

#welcome-modal .modal-header {
    margin-bottom: 0.8rem;
}

#welcome-modal .modal-title {
    font-size: 1.5rem;
    padding: 0 1.8rem;
}

#welcome-modal .security-note {
    margin-bottom: 0.7rem;
    padding: 0.7rem;
    font-size: 0.88rem;
}

#welcome-modal ol {
    padding-left: 1.1rem;
    margin: 0.3rem 0;
    font-size: 0.86rem;
}

#welcome-modal li {
    margin-bottom: 0.25rem;
    line-height: 1.5;
}

#welcome-modal .btn-primary {
    margin-top: 0.4rem;
    padding: 0.8rem;
    font-size: 0.95rem;
}

#welcome-modal .close-modal {
    width: 34px;
    height: 34px;
    top: -7px;
    right: -7px;
    font-size: 1.05rem;
}

/* Spinner overlay */
.spinner-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
}

.spinner {
    border: 8px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 8px solid var(--accent-color);
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* BIP39 Suggestions */
.bip39-suggestions {
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    transform: translateY(100%);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    z-index: 100;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}

.suggestion-item {
    padding: 8px 12px;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.suggestion-item:hover {
    background: var(--secondary-color);
}

.suggestion-item i {
    color: var(--accent-color);
    font-size: 0.9rem;
}

/* Responsive optimizations */
@media (max-width: 600px) {
    .container {
        padding: 1.2rem 0.8rem;
    }
    
    .logo {
        font-size: 1.8rem;
    }
    
    .tagline {
        font-size: 0.92rem;
        padding: 0 0.5rem;
    }
    
    .modal-content {
        padding: 1.2rem;
        width: 95%;
    }
    
    .modal-title {
        font-size: 1.4rem;
    }
    
    .modal-subtitle {
        font-size: 0.9rem;
    }
    
    .actions, .qr-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .seed-words {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .decrypt-section {
        padding: 1.2rem;
    }
    
    .drop-area {
        min-height: 140px;
        padding: 1.2rem;
    }
    
    .drop-area i {
        font-size: 2.2rem;
    }
    
    .drop-area p {
        font-size: 0.95rem;
    }
    
    #seed-phrase {
        min-height: 130px;
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    #welcome-modal .modal-content {
        padding: 1rem;
        width: 95%;
    }
    
    #welcome-modal .modal-title {
        font-size: 1.3rem;
        padding: 0 1.2rem;
    }
    
    #welcome-modal .security-note {
        padding: 0.6rem;
        font-size: 0.82rem;
    }
    
    #welcome-modal ol {
        padding-left: 1rem;
        font-size: 0.8rem;
    }
    
    #welcome-modal .close-modal {
        width: 32px;
        height: 32px;
        top: -6px;
        right: -6px;
    }
}

@media (max-width: 400px) {
    .logo {
        font-size: 1.6rem;
    }
    
    .logo-icon {
        height: 250px;
        width: 250px;
    }
    
    .modal-content {
        padding: 1rem;
    }
    
    .modal-title {
        font-size: 1.3rem;
    }
    
    .seed-words {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .word-hints {
        gap: 0.3rem;
    }
    
    .word-hint {
        font-size: 0.78rem;
        padding: 0.2rem 0.6rem;
    }
}