/* ===== CSS VARIABLES ===== */
:root {
    --primary-cyan: #00f3ff;
    --primary-purple: #b026ff;
    --accent-green: #00ff88;
    --accent-red: #ff2e63;
    --accent-yellow: #ffeb3b;
    --dark-bg: #0a0e27;
    --dark-card: #141b3d;
    --dark-surface: #1a2347;
    --text-primary: #e0e7ff;
    --text-secondary: #8b92b8;
    --text-muted: #4a5279;
    --border-color: rgba(0, 243, 255, 0.2);
    --glow-color: rgba(0, 243, 255, 0.4);
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inconsolata', monospace;
    background: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ===== ANIMATED BACKGROUNDS ===== */
.matrix-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, transparent 0%, rgba(0, 243, 255, 0.03) 50%, transparent 100%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 243, 255, 0.03) 2px,
            rgba(0, 243, 255, 0.03) 4px
        );
    animation: matrix-scroll 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

.cyber-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 243, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 243, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid-flow 30s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes matrix-scroll {
    0% { background-position: 0 0; }
    100% { background-position: 0 1000px; }
}

@keyframes grid-flow {
    0% { background-position: 0 0; }
    100% { background-position: 50px 50px; }
}

/* ===== CONTAINER ===== */
.container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== HEADER ===== */
.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 1s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-container {
    position: relative;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
    animation: pulse-glow 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.2); }
}

.logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.1em;
    position: relative;
    text-shadow: 0 0 30px rgba(0, 243, 255, 0.5);
    animation: glow-text 2s ease-in-out infinite alternate;
}

@keyframes glow-text {
    from { filter: drop-shadow(0 0 10px var(--primary-cyan)); }
    to { filter: drop-shadow(0 0 20px var(--primary-purple)); }
}

.logo-subtitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 0.3em;
    color: var(--text-secondary);
    margin-top: -0.5rem;
}

.header-tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    margin-top: 1rem;
}

/* ===== TAB NAVIGATION ===== */
.tab-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 1rem;
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    position: relative;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-cyan), var(--primary-purple));
    transition: width 0.3s ease;
}

.tab-btn:hover {
    color: var(--primary-cyan);
}

.tab-btn.active {
    color: var(--primary-cyan);
}

.tab-btn.active::before {
    width: 100%;
}

.tab-icon {
    font-size: 1.3rem;
}

/* ===== TAB CONTENT ===== */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

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

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

/* ===== CARD ===== */
.card {
    background: var(--dark-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 
        0 10px 40px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(0, 243, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.1), transparent);
    animation: card-shine 3s infinite;
}

@keyframes card-shine {
    0% { left: -100%; }
    50%, 100% { left: 100%; }
}

.card-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    color: var(--primary-cyan);
    margin-bottom: 0.5rem;
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* ===== INPUT GROUPS ===== */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    flex: 1;
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.9rem 1rem;
    color: var(--text-primary);
    font-family: 'Inconsolata', monospace;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-cyan);
    box-shadow: 0 0 0 3px rgba(0, 243, 255, 0.1);
}

.toggle-visibility {
    position: absolute;
    right: 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.toggle-visibility:hover {
    opacity: 1;
}

/* ===== STRENGTH METER ===== */
.strength-meter {
    height: 8px;
    background: var(--dark-surface);
    border-radius: 10px;
    overflow: hidden;
    margin: 1.5rem 0 0.5rem;
    position: relative;
}

.strength-bar {
    height: 100%;
    width: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 10px;
    position: relative;
}

.strength-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.strength-label {
    text-align: center;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    font-weight: 600;
}

/* ===== CHECKLIST ===== */
.checklist {
    display: grid;
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.7rem 1rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.check-icon {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.check-item.passed {
    border-color: var(--accent-green);
    background: rgba(0, 255, 136, 0.05);
}

.check-item.passed .check-icon {
    color: var(--accent-green);
}

.check-item.failed {
    border-color: var(--accent-red);
    background: rgba(255, 46, 99, 0.05);
}

.check-item.failed .check-icon {
    color: var(--accent-red);
}

/* ===== PASSWORD GENERATOR ===== */
.generated-password-display {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.password-output {
    flex: 1;
    background: var(--dark-surface);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1.2rem;
    font-family: 'Inconsolata', monospace;
    font-size: 1.3rem;
    color: var(--primary-cyan);
    text-align: center;
    word-break: break-all;
    letter-spacing: 0.05em;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.5rem;
}

.copy-btn:hover:not(:disabled) {
    background: var(--primary-cyan);
    border-color: var(--primary-cyan);
    transform: scale(1.05);
}

.copy-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.slider-group {
    margin: 2rem 0;
}

.slider-group label {
    display: block;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

#length-value {
    color: var(--primary-cyan);
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--dark-surface);
    border-radius: 10px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-cyan);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--primary-cyan);
    transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 20px var(--primary-cyan);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-cyan);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px var(--primary-cyan);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== CHECKBOXES ===== */
.options-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    padding: 0.8rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.checkbox-label:hover {
    border-color: var(--border-color);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--primary-cyan);
    border-color: var(--primary-cyan);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--dark-bg);
    font-size: 0.9rem;
    font-weight: bold;
}

/* ===== BUTTONS ===== */
.action-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-cyan), var(--primary-purple));
    border: none;
    border-radius: 8px;
    padding: 1.2rem 2rem;
    color: #fff;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    margin: 2rem 0;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 243, 255, 0.4);
}

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

.btn-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3), transparent);
    animation: btn-glow-animation 3s linear infinite;
    pointer-events: none;
}

@keyframes btn-glow-animation {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 0; }
}

/* ===== HASH DISPLAY ===== */
.hash-display {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.hash-display label {
    display: block;
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hash-output {
    font-family: 'Inconsolata', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    word-break: break-all;
    line-height: 1.6;
}

/* ===== FORM VALIDATOR ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.error-message {
    color: var(--accent-red);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    display: none;
    animation: shake 0.3s ease;
}

.error-message.show {
    display: block;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--accent-red);
}

.char-counter {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.result-display {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    display: none;
}

.result-display.success {
    display: block;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--accent-green);
    animation: slideIn 0.5s ease;
}

.result-display.error {
    display: block;
    background: rgba(255, 46, 99, 0.1);
    border: 1px solid var(--accent-red);
    animation: slideIn 0.5s ease;
}

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

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    margin-top: 4rem;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

.footer-warning {
    margin-top: 0.5rem;
    color: var(--accent-yellow);
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--dark-card);
    border: 1px solid var(--primary-cyan);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    font-family: 'Orbitron', sans-serif;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .logo {
        font-size: 2.5rem;
    }

    .tab-nav {
        flex-direction: column;
    }

    .tab-btn {
        justify-content: flex-start;
    }

    .card {
        padding: 1.5rem;
    }

    .options-group {
        grid-template-columns: 1fr;
    }
}