/* ========================================
   REAL-TIME CURRENCY EXCHANGE SYSTEM
   CSS STYLESHEET
   ======================================== */

/* =============== GLOBAL STYLES =============== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: #333;
}

/* =============== NAVBAR STYLES =============== */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    color: white;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-buttons {
    display: flex;
    gap: 10px;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 20px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: white;
    transform: translateY(-2px);
}

/* =============== CONTAINER LAYOUT =============== */
.container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    max-width: 1200px;
    width: 100%;
    margin: 40px auto;
    padding: 0 20px;
    flex: 1;
}

/* =============== CARD STYLES =============== */
.main-card, .history-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.5s ease-out;
}

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

/* =============== HEADING STYLES =============== */
h1 {
    color: #333;
    margin-bottom: 30px;
    text-align: center;
    font-size: 28px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    color: #555;
    margin-bottom: 20px;
    font-size: 18px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

h3 {
    color: #333;
    font-size: 16px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* =============== STATUS BAR STYLES =============== */
.status-bar {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #27ae60;
    animation: pulse 2s infinite;
}

.status-dot.updating {
    animation: pulse 0.6s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.status-text {
    color: #555;
    font-weight: 600;
}

.last-updated {
    color: #888;
    font-size: 11px;
}

/* =============== FORM GROUP STYLES =============== */
.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 600;
    font-size: 14px;
}

select, input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.3s ease;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

select:focus, input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* =============== AMOUNT ROW LAYOUT =============== */
.amount-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* =============== ERROR MESSAGE STYLES =============== */
.error-message {
    color: #e74c3c;
    font-size: 12px;
    margin-top: 5px;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* =============== BUTTON GROUP STYLES =============== */
.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 30px;
}

/* =============== BUTTON STYLES =============== */
button {
    padding: 13px 20px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:active {
    transform: scale(0.98);
}

.swap-btn {
    background: #667eea;
    color: white;
    margin-top: 0;
}

.swap-btn:hover {
    background: #764ba2;
    transform: translateY(-2px);
}

.clear-btn {
    background: #e0e0e0;
    color: #333;
}

.clear-btn:hover {
    background: #d0d0d0;
}

.convert-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    grid-column: 1 / -1;
}

.convert-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.convert-btn.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* =============== RESULT CONTAINER STYLES =============== */
.result-container {
    margin-top: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    border-radius: 15px;
    text-align: center;
    display: none;
    animation: fadeIn 0.4s ease;
    border: 2px solid rgba(102, 126, 234, 0.2);
}

.result-container.show {
    display: block;
}

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

.result-label {
    color: #666;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.result-amount {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
}

.exchange-rate {
    color: #888;
    font-size: 12px;
    margin-bottom: 10px;
}

.real-time-indicator {
    color: #27ae60;
    font-size: 11px;
    font-weight: 600;
}

/* =============== LOADING SPINNER STYLES =============== */
.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

.loading-spinner.show {
    display: block;
}

/* =============== CONTROLS STYLES =============== */
.controls {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.toggle-btn {
    flex: 1;
    background: #667eea;
    color: white;
    padding: 10px;
    font-size: 12px;
}

.toggle-btn.active {
    background: #27ae60;
}

.toggle-btn:hover {
    opacity: 0.9;
}

.update-interval {
    font-size: 12px;
    color: #888;
    text-align: center;
    margin-top: 10px;
}

/* =============== HISTORY CARD STYLES =============== */
.history-card {
    max-height: 600px;
    overflow-y: auto;
}

.history-card::-webkit-scrollbar {
    width: 8px;
}

.history-card::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.history-card::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

/* =============== HISTORY ITEM STYLES =============== */
.history-item {
    background: #f9f9f9;
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideInLeft 0.3s ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.history-text {
    flex: 1;
    font-size: 13px;
    color: #333;
}

.history-amount {
    font-weight: 700;
    color: #667eea;
    margin-right: 10px;
}

.delete-history-btn {
    background: #e74c3c;
    color: white;
    padding: 8px 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.3s ease;
}

.delete-history-btn:hover {
    background: #c0392b;
}

.delete-all-btn {
    background: #e74c3c;
    color: white;
    width: 100%;
    margin-top: 15px;
}

.delete-all-btn:hover {
    background: #c0392b;
}

.no-history {
    color: #999;
    text-align: center;
    padding: 20px;
    font-size: 13px;
}

/* =============== MODAL STYLES =============== */
.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 20px;
    width: 90%;
    max-width: 700px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    z-index: 1001;
    animation: modalSlideIn 0.4s ease-out;
}

.modal.show {
    display: block;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -55%);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.show {
    display: block;
}

.modal-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px;
    border-bottom: 2px solid #f0f0f0;
}

.modal-header h2 {
    color: #333;
    margin: 0;
    border: none;
    padding: 0;
    font-size: 24px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.close-btn {
    background: none;
    border: none;
    font-size: 32px;
    color: #666;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.close-btn:hover {
    color: #e74c3c;
    transform: rotate(90deg);
}

.modal-body {
    padding: 25px;
    color: #555;
    overflow-y: auto;
    flex: 1;
}

.about-section {
    margin-bottom: 25px;
}

.about-section p {
    line-height: 1.6;
    color: #666;
    font-size: 14px;
}

/* =============== TEAM BOX =============== */
.team-box {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: 15px;
    border-radius: 12px;
    text-align: left;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    animation: slideIn 0.5s ease-out;
}

.team-box:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

.team-box .box-header {
    color: #333;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
}

.team-box .box-content {
    color: #333;
    font-size: 16px;
    font-weight: 600;
}

/* =============== MENTOR BOX =============== */
.mentor-box {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: 15px;
    border-radius: 12px;
    text-align: left;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    animation: mentorPopup 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes mentorPopup {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    70% {
        transform: scale(1.1);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.mentor-box:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

.mentor-box .box-header {
    color: #333;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
}

.mentor-box .box-content {
    color: #333;
    font-size: 16px;
    font-weight: 600;
}

/* =============== FEEDBACK SECTION STYLES =============== */
.feedback-section {
    background: linear-gradient(135deg, #e8f4f8, #f0e8f8);
    padding: 18px;
    border-radius: 12px;
    border: 2px solid rgba(102, 126, 234, 0.15);
}

.feedback-section p {
    color: #555;
    margin-bottom: 12px;
    font-size: 14px;
}

.feedback-btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 10px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    transition: all 0.3s ease;
    text-align: center;
}

.feedback-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.mentor-role {
    color: #333;
    font-weight: 600;
    font-size: 13px;
    margin-left: 6px;
}

/* slight visual tweak for creators area to match */
.creators-list {
    margin-top: 12px;
}

/* =============== CREATORS LIST STYLES =============== */
.creators-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.creator-card {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.creator-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

.creator-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.creator-name {
    font-weight: 600;
    color: #333;
    font-size: 13px;
    line-height: 1.4;
}

/* =============== FEATURES LIST STYLES =============== */
.features-list {
    list-style: none;
    padding: 0;
}

.features-list li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: #666;
    font-size: 14px;
    line-height: 1.5;
}

.features-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
    font-size: 16px;
}

/* =============== TECH STACK STYLES =============== */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

.tech-badge {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

/* =============== MODAL FOOTER STYLES =============== */
.modal-footer {
    padding: 20px 25px;
    border-top: 2px solid #f0f0f0;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-close-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 10px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.modal-close-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

/* =============== FOOTER STYLES =============== */
.footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 25px 20px;
    margin-top: 50px;
    border-top: 3px solid rgba(255, 255, 255, 0.2);
}

.footer-content p {
    margin: 5px 0;
    font-size: 13px;
    letter-spacing: 0.5px;
}

.footer-content p:first-child {
    font-weight: 600;
    font-size: 14px;
}

/* =============== RESPONSIVE DESIGN =============== */
@media (max-width: 1024px) {
    .container {
        gap: 20px;
        margin: 30px auto;
    }

    .main-card, .history-card {
        padding: 30px;
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        gap: 20px;
        margin: 20px auto;
    }

    .main-card, .history-card {
        padding: 25px;
    }

    .amount-row {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 24px;
    }

    .result-amount {
        font-size: 28px;
    }

    .status-bar {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    .modal {
        width: 95%;
        max-height: 90vh;
    }

    .creators-list {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 10px;
    }

    .nav-brand {
        font-size: 16px;
    }

    .nav-btn {
        padding: 8px 15px;
        font-size: 12px;
    }

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

    .swap-btn, .clear-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        gap: 15px;
        padding: 0 10px;
    }

    .main-card, .history-card {
        padding: 15px;
        border-radius: 15px;
    }

    h1 {
        font-size: 20px;
        margin-bottom: 20px;
    }

    h2 {
        font-size: 16px;
    }

    .result-amount {
        font-size: 24px;
    }

    label {
        font-size: 13px;
    }

    select, input {
        padding: 10px 12px;
        font-size: 13px;
    }

    .modal-header {
        padding: 20px;
    }

    .modal-header h2 {
        font-size: 20px;
    }

    .modal-body {
        padding: 20px;
    }

    .creators-list {
        grid-template-columns: repeat(2, 1fr);
    }
}