/* ===== Calculator App Styles ===== */
.calculator-app {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

/* Controls Section */
.calculator-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.calc-mode-toggle {
    display: flex;
    gap: 0.5rem;
    background: rgba(139, 92, 246, 0.1);
    padding: 0.25rem;
    border-radius: 12px;
}

.calc-mode-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calc-mode-btn:hover {
    color: var(--text-primary);
}

.calc-mode-btn.active {
    background: var(--gradient-main);
    color: white;
    box-shadow: var(--shadow-violet);
}

/* Calculator Container */
.calculator-container {
    background: rgba(139, 92, 246, 0.08);
    border-radius: 16px;
    padding: 1rem;
    border: 2px solid rgba(139, 92, 246, 0.2);
    transition: var(--transition);
}

/* Light Theme for Calculator */
.calculator-container.light-theme {
    background: #f8f9fa;
    border-color: #e0e0e0;
}

.calculator-container.light-theme .calculator-display {
    background: #ffffff;
    border-color: #e0e0e0;
}

.calculator-container.light-theme .calc-expression {
    color: #666;
}

.calculator-container.light-theme .calc-result {
    color: #1a1a2e;
}

.calculator-container.light-theme .calc-key.number {
    background: #ffffff;
    color: #1a1a2e;
    border-color: #e0e0e0;
}

.calculator-container.light-theme .calc-key.number:hover {
    background: #f0f0f0;
}

.calculator-container.light-theme .calc-key.operator {
    background: #f0f0f0;
    color: var(--primary-violet);
    border-color: #e0e0e0;
}

.calculator-container.light-theme .calc-key.operator:hover {
    background: #e0e0e0;
}

.calculator-container.light-theme .calc-key.clear {
    background: #fff0f0;
    color: #dc3545;
    border-color: #ffcccc;
}

.calculator-container.light-theme .calc-key.clear:hover {
    background: #ffe0e0;
}

.calculator-container.light-theme .calc-key.func {
    background: #f0f0ff;
    color: var(--dark-violet);
    border-color: #e0e0ff;
}

.calculator-container.light-theme .calc-key.func:hover {
    background: #e0e0ff;
}

/* Calculator Display */
.calculator-display {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    border: 2px solid rgba(139, 92, 246, 0.2);
    height: 70px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    overflow: hidden;
}

.calc-expression {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-family: 'Consolas', monospace;
    text-align: right;
    min-height: 1em;
    word-wrap: break-word;
    margin-bottom: 0.25rem;
}

.calc-result {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 600;
    font-family: 'Consolas', monospace;
    text-align: right;
    word-wrap: break-word;
    line-height: 1.2;
}

/* Calculator Keypad */
.calculator-keypad {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Scientific Keys */
.calc-scientific-keys {
    display: none;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.4rem;
    margin-bottom: 0.25rem;
}

.calc-scientific-keys.visible {
    display: grid;
}

/* Main Keys */
.calc-main-keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
}

/* Calculator Keys */
.calc-key {
    padding: 0.7rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: 2px solid rgba(139, 92, 246, 0.2);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-key:active {
    transform: scale(0.95);
}

.calc-key.number {
    background: var(--bg-card);
    color: var(--text-primary);
}

.calc-key.number:hover {
    background: rgba(139, 92, 246, 0.15);
    border-color: var(--primary-violet);
}

.calc-key.operator {
    background: rgba(139, 92, 246, 0.15);
    color: var(--primary-violet);
}

.calc-key.operator:hover {
    background: rgba(139, 92, 246, 0.25);
    border-color: var(--primary-violet);
}

.calc-key.clear {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.calc-key.clear:hover {
    background: rgba(239, 68, 68, 0.25);
    border-color: #ef4444;
}

.calc-key.equals {
    background: var(--gradient-main);
    color: white;
    border: none;
}

.calc-key.equals:hover {
    box-shadow: var(--shadow-violet);
    transform: translateY(-2px);
}

.calc-key.equals:active {
    transform: translateY(0) scale(0.98);
}

.calc-key.func {
    background: rgba(139, 92, 246, 0.1);
    color: var(--secondary-violet);
    font-size: 0.8rem;
    padding: 0.5rem;
}

.calc-key.func:hover {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--primary-violet);
}

.calc-key.func sup {
    font-size: 0.65rem;
}

/* History Section */
.calc-history-section {
    background: rgba(139, 92, 246, 0.05);
    border-radius: 12px;
    padding: 0.75rem;
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.calc-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.calc-history-header label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calc-clear-history {
    padding: 0.3rem 0.5rem;
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 6px;
    color: #ef4444;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.calc-clear-history:hover {
    background: rgba(239, 68, 68, 0.1);
}

.calc-history-list {
    max-height: 80px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.calc-history-empty {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-align: center;
    padding: 0.5rem;
}

.calc-history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0.6rem;
    background: rgba(139, 92, 246, 0.08);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.calc-history-item:hover {
    background: rgba(139, 92, 246, 0.15);
}

.calc-history-item .expression {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-family: 'Consolas', monospace;
}

.calc-history-item .result {
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: 'Consolas', monospace;
}

/* About Section */
.calc-about-container {
    margin-top: 8rem;
    padding-top: 1rem;
    border-top: 2px solid rgba(139, 92, 246, 0.2);
}

.calc-info-section {
    color: var(--text-secondary);
}

.calc-info-section h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.calc-info-section p {
    line-height: 1.7;
    margin-bottom: 1rem;
}

.calc-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.calc-info-card {
    background: rgba(139, 92, 246, 0.08);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid rgba(139, 92, 246, 0.15);
}

.calc-info-card h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calc-info-card h4 i {
    color: var(--primary-violet);
}

.calc-info-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

.calc-info-section h4 {
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.calc-shortcuts {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.calc-shortcuts li {
    font-size: 0.9rem;
    padding: 0.5rem;
    background: rgba(139, 92, 246, 0.05);
    border-radius: 6px;
}

.calc-shortcuts li strong {
    color: var(--primary-violet);
    font-family: 'Consolas', monospace;
}

.calc-steps {
    list-style: none;
    counter-reset: step-counter;
    padding-left: 0;
    margin: 1rem 0;
}

.calc-steps li {
    counter-increment: step-counter;
    padding: 0.6rem 0.6rem 0.6rem 2.5rem;
    margin-bottom: 0.5rem;
    background: rgba(139, 92, 246, 0.05);
    border-radius: 8px;
    position: relative;
    font-size: 0.9rem;
}

.calc-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.25rem;
    height: 1.25rem;
    background: var(--gradient-main);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-use-cases {
    list-style: none;
    padding-left: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    margin: 1rem 0;
}

.calc-use-cases li {
    padding: 0.5rem 0.75rem;
    background: rgba(139, 92, 246, 0.05);
    border-radius: 6px;
    font-size: 0.9rem;
}

.calc-use-cases li::before {
    content: "•";
    color: var(--primary-violet);
    font-weight: bold;
    margin-right: 0.5rem;
}

.calc-features-list {
    background: rgba(139, 92, 246, 0.08);
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1.5rem;
}

.calc-features-list h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.calc-features-list ul {
    list-style: none;
    padding-left: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.calc-features-list li {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calc-features-list li i {
    color: #22c55e;
    font-size: 0.8rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .calc-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .calculator-controls {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .calc-mode-toggle {
        width: 100%;
        justify-content: center;
    }
    
    .calc-scientific-keys {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .calc-key {
        padding: 0.6rem;
        font-size: 1rem;
    }
    
    .calc-result {
        font-size: 1.5rem;
    }
    
    .calc-info-grid {
        grid-template-columns: 1fr;
    }
    
    .calc-shortcuts {
        grid-template-columns: 1fr;
    }
    
    .calc-use-cases {
        grid-template-columns: 1fr;
    }
    
    .calc-features-list ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .calc-scientific-keys {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .calc-key.func {
        font-size: 0.75rem;
        padding: 0.4rem;
    }
    
    .calc-result {
        font-size: 1.35rem;
    }
}

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

/* Large Tablets and Small Laptops in Landscape (1024px - 1200px) */
@media screen and (orientation: landscape) and (max-width: 1200px) {
    .calculator-app {
        gap: 0.35rem;
    }
    
    .calculator-container {
        padding: 0.875rem;
    }
    
    .calc-about-container {
        margin-top: 6rem;
    }
    
    .calc-info-section h3 {
        font-size: 1.2rem;
    }
}

/* Tablets in Landscape (768px - 1024px) */
@media screen and (orientation: landscape) and (max-width: 1024px) and (min-width: 768px) {
    .calculator-app {
        gap: 0.3rem;
    }
    
    .calculator-controls {
        gap: 0.75rem;
    }
    
    .calc-mode-toggle {
        padding: 0.2rem;
        border-radius: 10px;
        gap: 0.35rem;
    }
    
    .calc-mode-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
        border-radius: 8px;
    }
    
    .calculator-container {
        padding: 0.75rem;
        border-radius: 12px;
    }
    
    .calculator-display {
        padding: 0.6rem 0.85rem;
        margin-bottom: 0.6rem;
        height: 60px;
        border-radius: 10px;
    }
    
    .calc-expression {
        font-size: 0.75rem;
    }
    
    .calc-result {
        font-size: 1.5rem;
    }
    
    .calculator-keypad {
        gap: 0.4rem;
    }
    
    .calc-scientific-keys {
        gap: 0.3rem;
        margin-bottom: 0.2rem;
    }
    
    .calc-main-keys {
        gap: 0.3rem;
    }
    
    .calc-key {
        padding: 0.55rem;
        font-size: 1rem;
        border-radius: 10px;
    }
    
    .calc-key.func {
        font-size: 0.7rem;
        padding: 0.4rem;
    }
    
    .calc-key.func sup {
        font-size: 0.55rem;
    }
    
    .calc-history-section {
        padding: 0.6rem;
        border-radius: 10px;
    }
    
    .calc-history-header label {
        font-size: 0.7rem;
    }
    
    .calc-clear-history {
        padding: 0.25rem 0.4rem;
        font-size: 0.65rem;
    }
    
    .calc-history-list {
        max-height: 65px;
        gap: 0.3rem;
    }
    
    .calc-history-item {
        padding: 0.35rem 0.5rem;
    }
    
    .calc-history-item .expression {
        font-size: 0.65rem;
    }
    
    .calc-history-item .result {
        font-size: 0.75rem;
    }
    
    /* About Section */
    .calc-about-container {
        margin-top: 4rem;
    }
    
    .calc-info-section h3 {
        font-size: 1.1rem;
    }
    
    .calc-info-section p {
        font-size: 0.85rem;
    }
    
    .calc-info-section h4 {
        font-size: 1rem;
        margin: 1rem 0 0.5rem;
    }
    
    .calc-info-grid {
        gap: 0.75rem;
        margin: 1rem 0;
    }
    
    .calc-info-card {
        padding: 0.875rem;
        border-radius: 10px;
    }
    
    .calc-info-card h4 {
        font-size: 0.9rem;
    }
    
    .calc-info-card p {
        font-size: 0.8rem;
    }
    
    .calc-shortcuts li,
    .calc-steps li,
    .calc-use-cases li {
        font-size: 0.8rem;
    }
    
    .calc-features-list {
        padding: 0.875rem;
    }
    
    .calc-features-list li {
        font-size: 0.8rem;
    }
}

/* Small Tablets / Large Phones in Landscape (600px - 768px) */
@media screen and (orientation: landscape) and (max-width: 768px) and (min-width: 480px) {
    .calculator-app {
        gap: 0.25rem;
    }
    
    .calculator-controls {
        gap: 0.5rem;
    }
    
    .calc-mode-toggle {
        padding: 0.15rem;
        border-radius: 8px;
        gap: 0.25rem;
    }
    
    .calc-mode-btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.65rem;
        border-radius: 6px;
        gap: 0.35rem;
    }
    
    .calc-mode-btn i {
        font-size: 0.6rem;
    }
    
    .calculator-container {
        padding: 0.6rem;
        border-radius: 10px;
    }
    
    .calculator-display {
        padding: 0.5rem 0.7rem;
        margin-bottom: 0.5rem;
        height: 50px;
        border-radius: 8px;
    }
    
    .calc-expression {
        font-size: 0.65rem;
        margin-bottom: 0.15rem;
    }
    
    .calc-result {
        font-size: 1.25rem;
    }
    
    .calculator-keypad {
        gap: 0.3rem;
    }
    
    .calc-scientific-keys {
        gap: 0.25rem;
        margin-bottom: 0.15rem;
    }
    
    .calc-main-keys {
        gap: 0.25rem;
    }
    
    .calc-key {
        padding: 0.45rem;
        font-size: 0.85rem;
        border-radius: 8px;
    }
    
    .calc-key.func {
        font-size: 0.6rem;
        padding: 0.35rem;
    }
    
    .calc-key.func sup {
        font-size: 0.5rem;
    }
    
    .calc-history-section {
        padding: 0.5rem;
        border-radius: 8px;
    }
    
    .calc-history-header {
        margin-bottom: 0.35rem;
    }
    
    .calc-history-header label {
        font-size: 0.6rem;
        gap: 0.35rem;
    }
    
    .calc-clear-history {
        padding: 0.2rem 0.35rem;
        font-size: 0.55rem;
        border-radius: 4px;
    }
    
    .calc-history-list {
        max-height: 55px;
        gap: 0.25rem;
    }
    
    .calc-history-empty {
        font-size: 0.65rem;
        padding: 0.35rem;
    }
    
    .calc-history-item {
        padding: 0.3rem 0.4rem;
        border-radius: 5px;
    }
    
    .calc-history-item .expression {
        font-size: 0.55rem;
    }
    
    .calc-history-item .result {
        font-size: 0.65rem;
    }
    
    /* About Section */
    .calc-about-container {
        margin-top: 2rem;
    }
    
    .calc-info-section h3 {
        font-size: 0.95rem;
        margin-bottom: 0.75rem;
    }
    
    .calc-info-section p {
        font-size: 0.7rem;
        margin-bottom: 0.5rem;
        line-height: 1.5;
    }
    
    .calc-info-section h4 {
        font-size: 0.85rem;
        margin: 0.75rem 0 0.5rem;
    }
    
    .calc-info-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
        margin: 0.75rem 0;
    }
    
    .calc-info-card {
        padding: 0.6rem;
        border-radius: 8px;
    }
    
    .calc-info-card h4 {
        font-size: 0.7rem;
        margin-bottom: 0.3rem;
        gap: 0.35rem;
    }
    
    .calc-info-card p {
        font-size: 0.6rem;
    }
    
    .calc-shortcuts {
        gap: 0.35rem;
    }
    
    .calc-shortcuts li {
        font-size: 0.65rem;
        padding: 0.35rem;
        border-radius: 5px;
    }
    
    .calc-steps li {
        padding: 0.4rem 0.5rem 0.4rem 2rem;
        margin-bottom: 0.35rem;
        font-size: 0.65rem;
        border-radius: 6px;
    }
    
    .calc-steps li::before {
        left: 0.5rem;
        width: 1rem;
        height: 1rem;
        font-size: 0.6rem;
    }
    
    .calc-use-cases {
        gap: 0.35rem;
        margin: 0.75rem 0;
    }
    
    .calc-use-cases li {
        font-size: 0.65rem;
        padding: 0.35rem 0.5rem;
        border-radius: 5px;
    }
    
    .calc-features-list {
        padding: 0.6rem;
        border-radius: 8px;
        margin-top: 0.75rem;
    }
    
    .calc-features-list h4 {
        margin-bottom: 0.5rem;
        font-size: 0.8rem;
    }
    
    .calc-features-list ul {
        gap: 0.35rem;
    }
    
    .calc-features-list li {
        font-size: 0.65rem;
        gap: 0.35rem;
    }
    
    .calc-features-list li i {
        font-size: 0.6rem;
    }
}

/* Mobile Phones in Landscape (height < 500px) */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .calculator-app {
        gap: 0.2rem;
    }
    
    .calculator-controls {
        gap: 0.4rem;
    }
    
    .calc-mode-toggle {
        padding: 0.1rem;
        border-radius: 6px;
        gap: 0.2rem;
    }
    
    .calc-mode-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.55rem;
        border-radius: 5px;
        gap: 0.25rem;
    }
    
    .calc-mode-btn i {
        font-size: 0.5rem;
    }
    
    .calculator-container {
        padding: 0.5rem;
        border-radius: 8px;
        border-width: 1.5px;
    }
    
    .calculator-display {
        padding: 0.4rem 0.6rem;
        margin-bottom: 0.4rem;
        height: 42px;
        border-radius: 6px;
        border-width: 1.5px;
    }
    
    .calc-expression {
        font-size: 0.55rem;
        margin-bottom: 0.1rem;
    }
    
    .calc-result {
        font-size: 1.05rem;
    }
    
    .calculator-keypad {
        gap: 0.25rem;
    }
    
    .calc-scientific-keys {
        gap: 0.2rem;
        margin-bottom: 0.1rem;
    }
    
    .calc-main-keys {
        gap: 0.2rem;
    }
    
    .calc-key {
        padding: 0.35rem;
        font-size: 0.75rem;
        border-radius: 6px;
        border-width: 1.5px;
    }
    
    .calc-key.func {
        font-size: 0.5rem;
        padding: 0.25rem;
    }
    
    .calc-key.func sup {
        font-size: 0.4rem;
    }
    
    .calc-history-section {
        padding: 0.4rem;
        border-radius: 6px;
    }
    
    .calc-history-header {
        margin-bottom: 0.25rem;
    }
    
    .calc-history-header label {
        font-size: 0.5rem;
        gap: 0.25rem;
    }
    
    .calc-clear-history {
        padding: 0.15rem 0.25rem;
        font-size: 0.5rem;
        border-radius: 3px;
    }
    
    .calc-history-list {
        max-height: 45px;
        gap: 0.2rem;
    }
    
    .calc-history-empty {
        font-size: 0.55rem;
        padding: 0.25rem;
    }
    
    .calc-history-item {
        padding: 0.2rem 0.35rem;
        border-radius: 4px;
    }
    
    .calc-history-item .expression {
        font-size: 0.5rem;
    }
    
    .calc-history-item .result {
        font-size: 0.55rem;
    }
    
    /* About Section */
    .calc-about-container {
        margin-top: 1.5rem;
    }
    
    .calc-info-section h3 {
        font-size: 0.8rem;
        margin-bottom: 0.5rem;
    }
    
    .calc-info-section p {
        font-size: 0.6rem;
        margin-bottom: 0.4rem;
        line-height: 1.4;
    }
    
    .calc-info-section h4 {
        font-size: 0.7rem;
        margin: 0.5rem 0 0.35rem;
    }
    
    .calc-info-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.4rem;
        margin: 0.5rem 0;
    }
    
    .calc-info-card {
        padding: 0.5rem;
        border-radius: 6px;
    }
    
    .calc-info-card h4 {
        font-size: 0.6rem;
        margin-bottom: 0.25rem;
        gap: 0.25rem;
    }
    
    .calc-info-card h4 i {
        font-size: 0.55rem;
    }
    
    .calc-info-card p {
        font-size: 0.5rem;
        line-height: 1.3;
    }
    
    .calc-shortcuts {
        gap: 0.25rem;
    }
    
    .calc-shortcuts li {
        font-size: 0.55rem;
        padding: 0.25rem;
        border-radius: 4px;
    }
    
    .calc-steps li {
        padding: 0.3rem 0.4rem 0.3rem 1.6rem;
        margin-bottom: 0.25rem;
        font-size: 0.55rem;
        border-radius: 5px;
    }
    
    .calc-steps li::before {
        left: 0.4rem;
        width: 0.85rem;
        height: 0.85rem;
        font-size: 0.5rem;
    }
    
    .calc-use-cases {
        gap: 0.25rem;
        margin: 0.5rem 0;
    }
    
    .calc-use-cases li {
        font-size: 0.55rem;
        padding: 0.25rem 0.4rem;
        border-radius: 4px;
    }
    
    .calc-features-list {
        padding: 0.5rem;
        border-radius: 6px;
        margin-top: 0.5rem;
    }
    
    .calc-features-list h4 {
        margin-bottom: 0.35rem;
        font-size: 0.65rem;
    }
    
    .calc-features-list ul {
        gap: 0.25rem;
    }
    
    .calc-features-list li {
        font-size: 0.55rem;
        gap: 0.25rem;
    }
    
    .calc-features-list li i {
        font-size: 0.5rem;
    }
}

/* Very small mobile landscape (height < 400px) */
@media screen and (orientation: landscape) and (max-height: 400px) {
    .calculator-app {
        gap: 0.15rem;
    }
    
    .calc-mode-btn {
        padding: 0.2rem 0.4rem;
        font-size: 0.5rem;
    }
    
    .calculator-container {
        padding: 0.35rem;
    }
    
    .calculator-display {
        padding: 0.3rem 0.5rem;
        height: 36px;
    }
    
    .calc-expression {
        font-size: 0.5rem;
    }
    
    .calc-result {
        font-size: 0.9rem;
    }
    
    .calc-key {
        padding: 0.25rem;
        font-size: 0.65rem;
    }
    
    .calc-key.func {
        font-size: 0.45rem;
        padding: 0.2rem;
    }
    
    .calc-history-section {
        padding: 0.3rem;
    }
    
    .calc-history-list {
        max-height: 35px;
    }
    
    .calc-about-container {
        margin-top: 1rem;
    }
    
    .calc-info-section h3 {
        font-size: 0.7rem;
    }
    
    .calc-info-section p {
        font-size: 0.5rem;
    }
    
    .calc-info-card {
        padding: 0.35rem;
    }
    
    .calc-info-card h4 {
        font-size: 0.5rem;
    }
    
    .calc-info-card p {
        font-size: 0.45rem;
    }
}