@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

:root {
    --clr-background: #F8F9FA;
    --clr-background-alt: #FFFFFF;
    --clr-text-primary: #2D3748;
    --clr-text-secondary: #718096;
    --clr-text-muted: #A0AEC0;
    --clr-accent-primary: #007BFF;
    --clr-accent-secondary: #28A745;
    --clr-border: #E2E8F0;
    --clr-shadow: rgba(0, 0, 0, 0.05);
    --clr-shadow-hover: rgba(0, 0, 0, 0.1);
    --font-primary: 'Poppins', sans-serif;
    --max-width: 1200px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --clr-success: #20c997;
    --clr-danger: crimson;
    --clr-warning: orangered;
    --clr-info: #17a2b8;
    --gradient: linear-gradient(135deg, var(--clr-accent-primary), var(--clr-accent-secondary));
    --card-shadow: 0 15px 40px rgba(0, 123, 255, 0.08);
    --clr-knowledge: #4361ee;
    --clr-light-blue: #e3f2fd;
    --clr-light-green: #e8f5e9;
    --clr-light-red: #ffebee;
    --clr-light-orange: #fff3e0;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --clr-background: #0F1621;
    --clr-background-alt: #1E252B;
    --clr-text-primary: #E2E8F0;
    --clr-text-secondary: #CBD5E0;
    --clr-text-muted: #90A4B7;
    --clr-border: #2D3748;
    --clr-shadow: rgba(0, 0, 0, 0.4);
    --clr-shadow-hover: rgba(0, 0, 0, 0.6);
    --clr-light-blue: #1a237e;
    --clr-light-green: #1b5e20;
    --clr-light-red: #b71c1c;
    --clr-light-orange: #e65100;
}

*,
*::after,
*::before {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
    outline: none;
    transition: var(--transition);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 3px;
    height: 3px;
}

::-webkit-scrollbar-track {
    background: var(--clr-background);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--clr-accent-primary);
}

.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.logo-loader {
    display: flex;
    gap: 8px;
    margin-bottom: 1rem;
    justify-content: center;
}

.loader .logo-part {
    width: 20px;
    height: 60px;
    background: var(--clr-accent-primary);
    border-radius: 4px;
    animation: loader-pulse 1.5s infinite ease-in-out !important;
}

.loader .part-1 {
    animation-delay: 0s !important;
}

.loader .part-2 {
    animation-delay: 0.2s !important;
}

.loader .part-3 {
    animation-delay: 0.4s !important;
}

@keyframes loader-pulse {

    0%,
    100% {
        transform: scaleY(1);
    }

    50% {
        transform: scaleY(1.3);
    }
}

/* Inputs With Number */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* Back to Top Button - Smaller */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: var(--clr-accent-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 15px var(--clr-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    font-size: 0.8rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #0069D9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--clr-shadow-hover);
}

/* Inputs [type="number","text"] */
input[type="number"],
input[type="text"] {
    padding: 12px 1rem 12px 1rem;
    border: 1px solid var(--clr-border);
    border-radius: 10px;
    font-size: 1.1rem;
    transition: var(--transition);
    font-family: var(--font-primary);
    font-weight: 500;
    color: var(--clr-text-primary);
    background-color: var(--clr-background);
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--clr-accent-primary);
    box-shadow: 0 0 0 2px var(--clr-accent-primary);
}

input[type="number"]::placeholder,
input[type="text"]::placeholder {
    color: var(--clr-text-muted);
    font-weight: 500;
}

/* Theme Switcher */
.theme-switcher {
    position: fixed;
    top: 5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--clr-background-alt);
    border: 1px solid var(--clr-border);
    color: var(--clr-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px var(--clr-shadow);
    z-index: 100;
    transition: var(--transition);
}

.theme-switcher:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--clr-shadow-hover);
}

.theme-switcher i {
    position: absolute;
    font-size: 1rem;
    transition: transform 0.3s ease, opacity 0.3s;
}

[data-theme="light"] .fa-moon,
[data-theme="dark"] .fa-sun {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="light"] .fa-sun,
[data-theme="dark"] .fa-moon {
    opacity: 1;
    transform: rotate(0);
}

/* Separator */
.separator {
    width: 80px;
    height: 4px;
    background: var(--gradient);
    border-radius: 2px;
    margin: 1.5rem auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    gap: 8px;
    font-size: clamp(0.9rem, 2vw, 1rem);
    white-space: nowrap;
    font-family: var(--font-primary);
    background-color: var(--clr-background-alt);
    color: var(--clr-text-primary);
}

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

.btn-primary:hover {
    background-color: #0069D9;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--clr-accent-secondary);
    border-color: var(--clr-accent-secondary);
}

.btn-secondary:hover {
    background-color: var(--clr-accent-secondary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.2);
}

.btn-outline {
    background-color: transparent;
    color: var(--clr-text-primary);
    border-color: var(--clr-text-primary);
}

.btn-outline:hover {
    background-color: var(--clr-text-primary);
    color: var(--clr-background);
}

.btn-large {
    padding: 14px 28px;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.btn-full {
    width: 100%;
    font-family: var(--font-primary);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* =========================================
   SIMPLIFIED EDUCATIONAL DIALOG SYSTEM
   ========================================= */

.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 1rem;
}

.dialog-overlay.active {
    opacity: 1;
    visibility: visible;
}

.dialog-overlay.closing {
    opacity: 0;
}

.dialog-overlay.closing .dialog-box {
    animation: dialogExit 0.3s ease forwards;
}

.dialog-box {
    background: var(--clr-background-alt);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    text-align: center;
    max-width: 480px;
    width: 100%;
    transform: scale(0.9) translateY(30px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--clr-border);
    position: relative;
    overflow: hidden;
}

.dialog-overlay.active .dialog-box {
    transform: scale(1) translateY(0);
    opacity: 1;
}

/* Educational header accent */
.dialog-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: var(--clr-knowledge);
}

.dialog-icon-container {
    position: relative;
    width: 90px;
    height: 90px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--clr-light-blue);
    border-radius: 50%;
    border: 2px solid var(--clr-accent-primary);
}

.dialog-icon {
    font-size: 2.8rem;
    color: var(--clr-accent-primary);
}

.dialog-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--clr-text-primary);
    margin-bottom: 0.8rem;
    letter-spacing: -0.3px;
}

.dialog-message {
    font-size: 1.05rem;
    color: var(--clr-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
    padding: 0 0.5rem;
}

.dialog-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.dialog-btn {
    padding: 0.9rem 2rem;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-primary);
    min-width: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.dialog-btn i {
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

.dialog-btn:hover i {
    transform: translateX(2px);
}

.dialog-btn:active {
    transform: scale(0.98);
}

.dialog-btn-primary {
    background: var(--clr-accent-primary);
    color: white;
    border: 2px solid var(--clr-accent-primary);
}

.dialog-btn-primary:hover {
    background: #0069d9;
    border-color: #0069d9;
}

.dialog-btn-secondary {
    background: transparent;
    border: 2px solid var(--clr-border);
    color: var(--clr-text-primary);
}

.dialog-btn-secondary:hover {
    background: var(--clr-background);
    border-color: var(--clr-accent-primary);
}

/* Progress bar for auto-dismiss dialogs */
.dialog-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 0 0 20px 20px;
    overflow: hidden;
}

.dialog-progress-bar {
    height: 100%;
    width: 100%;
    border-radius: 0 0 20px 20px;
    transform-origin: left;
    animation: progressShrink 5s linear forwards;
}

@keyframes progressShrink {
    0% {
        transform: scaleX(1);
    }

    100% {
        transform: scaleX(0);
    }
}

/* =========================================
   DIALOG ANIMATIONS
   ========================================= */

/* Dialog entry animation */
@keyframes dialogEntry {
    0% {
        opacity: 0;
        transform: scale(0.9) translateY(30px);
    }

    70% {
        transform: scale(1.02) translateY(-5px);
    }

    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.dialog-overlay.active .dialog-box {
    animation: dialogEntry 0.4s ease forwards;
}

/* Dialog exit animation */
@keyframes dialogExit {
    0% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }

    30% {
        transform: scale(1.02) translateY(-5px);
    }

    100% {
        opacity: 0;
        transform: scale(0.8) translateY(40px);
    }
}

/* =========================================
   DIALOG VARIANTS
   ========================================= */

/* Success */
.dialog-box.success::before {
    background: var(--clr-success);
}

.dialog-box.success .dialog-icon-container {
    background: var(--clr-light-green);
    border-color: var(--clr-success);
}

.dialog-box.success .dialog-icon {
    color: var(--clr-success);
}

.dialog-box.success .dialog-btn-primary {
    background: var(--clr-success);
    border-color: var(--clr-success);
}

.dialog-box.success .dialog-btn-primary:hover {
    background: #1ba87e;
    border-color: #1ba87e;
}

.dialog-box.success .dialog-progress-bar {
    background: var(--clr-success);
}

/* Danger / Error */
.dialog-box.error::before {
    background: var(--clr-danger);
}

.dialog-box.error .dialog-icon-container {
    background: var(--clr-light-red);
    border-color: var(--clr-danger);
}

.dialog-box.error .dialog-icon {
    color: var(--clr-danger);
}

.dialog-box.error .dialog-btn-primary {
    background: var(--clr-danger);
    border-color: var(--clr-danger);
}

.dialog-box.error .dialog-btn-primary:hover {
    background: #b3002d;
    border-color: #b3002d;
}

.dialog-box.error .dialog-progress-bar {
    background: var(--clr-danger);
}

/* Warning */
.dialog-box.warning::before {
    background: var(--clr-warning);
}

.dialog-box.warning .dialog-icon-container {
    background: var(--clr-light-orange);
    border-color: var(--clr-warning);
}

.dialog-box.warning .dialog-icon {
    color: var(--clr-warning);
}

.dialog-box.warning .dialog-btn-primary {
    background: var(--clr-warning);
    border-color: var(--clr-warning);
}

.dialog-box.warning .dialog-btn-primary:hover {
    background: #e63c00;
    border-color: #e63c00;
}

.dialog-box.warning .dialog-progress-bar {
    background: var(--clr-warning);
}

/* Info */
.dialog-box.info::before {
    background: var(--clr-info);
}

.dialog-box.info .dialog-icon-container {
    background: var(--clr-light-blue);
    border-color: var(--clr-info);
}

.dialog-box.info .dialog-icon {
    color: var(--clr-info);
}

.dialog-box.info .dialog-btn-primary {
    background: var(--clr-info);
    border-color: var(--clr-info);
}

.dialog-box.info .dialog-btn-primary:hover {
    background: #138496;
    border-color: #138496;
}

.dialog-box.info .dialog-progress-bar {
    background: var(--clr-info);
}

/* Confirmation */
.dialog-box.confirmation::before {
    background: var(--clr-knowledge);
}

.dialog-box.confirmation .dialog-icon-container {
    background: #e3e8ff;
    border-color: var(--clr-knowledge);
}

.dialog-box.confirmation .dialog-icon {
    color: var(--clr-knowledge);
}

.dialog-box.confirmation .dialog-btn-primary {
    background: var(--clr-knowledge);
    border-color: var(--clr-knowledge);
}

.dialog-box.confirmation .dialog-btn-primary:hover {
    background: #3a56e4;
    border-color: #3a56e4;
}

.dialog-box.confirmation .dialog-progress-bar {
    background: var(--clr-knowledge);
}

/* =========================================
   RESPONSIVE DESIGN
   ========================================= */

@media (max-width: 768px) {
    .dialog-box {
        padding: 2rem 1.5rem;
        max-width: 90%;
        border-radius: 16px;
    }

    .dialog-icon-container {
        width: 80px;
        height: 80px;
        margin-bottom: 1.2rem;
    }

    .dialog-icon {
        font-size: 2.3rem;
    }

    .dialog-title {
        font-size: 1.5rem;
    }

    .dialog-message {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }

    .dialog-buttons {
        gap: 0.8rem;
        flex-direction: column;
        align-items: stretch;
    }

    .dialog-btn {
        width: 100%;
        padding: 0.8rem 1.5rem;
        min-width: unset;
    }

    .dialog-overlay {
        padding: 0.5rem;
    }
}

@media (max-width: 480px) {
    .dialog-box {
        padding: 1.8rem 1.2rem;
        max-width: 95%;
    }

    .dialog-icon-container {
        width: 70px;
        height: 70px;
        margin-bottom: 1rem;
    }

    .dialog-icon {
        font-size: 2rem;
    }

    .dialog-title {
        font-size: 1.4rem;
    }

    .dialog-message {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    .dialog-btn {
        padding: 0.7rem 1.2rem;
        font-size: 0.95rem;
    }

    @keyframes dialogEntry {
        0% {
            opacity: 0;
            transform: scale(0.9) translateY(20px);
        }

        100% {
            opacity: 1;
            transform: scale(1) translateY(0);
        }
    }

    @keyframes dialogExit {
        0% {
            opacity: 1;
            transform: scale(1) translateY(0);
        }

        100% {
            opacity: 0;
            transform: scale(0.9) translateY(20px);
        }
    }
}

/* For reduced motion preferences */
@media (prefers-reduced-motion: reduce) {

    .dialog-box,
    .dialog-overlay,
    .dialog-btn,
    .dialog-icon,
    .dialog-progress-bar {
        animation: none !important;
        transition: none !important;
    }

    .dialog-overlay.active .dialog-box {
        transform: scale(1);
        opacity: 1;
    }

    .dialog-overlay.closing {
        opacity: 0;
    }

    .dialog-overlay.closing .dialog-box {
        transform: scale(0.9);
        opacity: 0;
    }
}