/* CSS Variables for Premium Output */
:root {
    --bg-color: #0b0f19;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --text-primary: #ffffff;
    --text-secondary: #a0aab2;
    --accent-1: #FF3366;
    --accent-2: #20E3B2;
    --accent-3: #8B5CF6;
    --font-family: 'Outfit', sans-serif;
    --border-radius: 24px;
    --panel-padding: 2rem;
}

@media(max-width: 600px) {
    :root {
        --border-radius: 16px;
        --panel-padding: 1rem;
    }
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    -webkit-tap-highlight-color: transparent;
}

/* Animated Background Blobs */
.blob {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.6;
    animation: float 20s infinite alternate cubic-bezier(0.4, 0, 0.2, 1);
}
.blob-1 {
    width: 40vw;
    height: 40vw;
    background: var(--accent-1);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}
.blob-2 {
    width: 35vw;
    height: 35vw;
    background: var(--accent-2);
    bottom: -10%;
    right: -10%;
    animation-duration: 25s;
    animation-delay: -5s;
}
.blob-3 {
    width: 25vw;
    height: 25vw;
    background: var(--accent-3);
    top: 40%;
    left: 40%;
    animation-duration: 30s;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(10vw, 10vh) scale(1.2); }
}

/* Glassmorphism Classes */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--border-radius);
    padding: var(--panel-padding);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Hide helper */
.hidden {
    display: none !important;
}

/* --- Login View --- */
#login-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 95%;
    max-width: 600px;
    text-align: center;
    z-index: 10;
}

#login-overlay h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

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

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group input {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.5rem;
    letter-spacing: 0.5rem;
    text-align: center;
    border: none;
    border-radius: 50px;
    background: rgba(0,0,0,0.2);
    color: white;
    outline: none;
    transition: box-shadow 0.3s ease;
    border: 1px solid var(--glass-border);
}

.input-group input:focus {
    box-shadow: 0 0 0 2px var(--accent-2);
}

.login-btn {
    background: var(--accent-1);
    color: white;
    border: none;
    padding: 1rem;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.login-btn:hover {
    background: var(--accent-2);
    transform: translateY(-2px);
}

.login-btn:active {
    transform: translateY(0) scale(0.98);
    background: #ff1a4d;
}

/* --- Dashboard View --- */
#app-container {
    width: 100%;
    max-width: 1000px;
    padding: 1.5rem 1rem;
    animation: fadeIn 0.5s ease;
}

.app-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    width: 100%;
}

.app-header h1 {
    font-size: 2.4rem;
    text-align: center;
    margin: 0;
    line-height: 1.2;
}

@media(max-width: 600px) {
    .app-header h1 {
        font-size: 1.8rem;
    }
}

/* --- Monthly Bill Panel --- */
.bill-panel {
    width: 95%;
    max-width: 600px;
    margin: 0 auto 1.5rem;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.bill-header {
    text-align: center;
}

.bill-label {
    font-size: 0.9rem;
    color: #a0aab2;
    text-transform: uppercase;
    letter-spacing: 2px;
}

#graph-container {
    width: 100%;
    max-width: 600px;
    height: 180px;
    margin: 0 auto 1.5rem;
    padding: 1rem;
    pointer-events: none;
}

.total-amount {
    font-size: 2.2rem;
    font-weight: 800;
    margin-top: 0.2rem;
    line-height: 1;
    color: #fff;
    text-shadow: 0 0 20px rgba(255, 51, 102, 0.2);
    letter-spacing: -0.5px;
}

.total-amount.red {
    color: #ef4444;
}

.total-amount.red small {
    color: #ef4444;
    opacity: 0.8;
}

.sub-total {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.4rem;
    opacity: 0.8;
    font-weight: 500;
}

#val-subtotal {
    font-weight: 700;
    color: #cbd5e1;
}

.bill-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
    margin: 0.5rem 0;
}

.bill-rows {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.bill-row {
    display: flex;
    flex-direction: column;
    padding: 1rem 0.8rem; /* Increased padding for better touch target */
    border-radius: 12px;
    transition: background 0.3s ease, transform 0.2s ease;
    border: 1px solid transparent;
}

.bill-row.has-link {
    cursor: pointer;
}

.bill-row.has-link:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--glass-border);
}

.bill-row.expanded {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.15);
    padding-bottom: 1.2rem;
}

.row-left {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.bill-row.has-link:active {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(0.99);
}

.expand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px; /* Slightly larger for mobile visibility */
    height: 24px;
    color: var(--text-secondary);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s ease;
    opacity: 0; /* Hidden by default */
}

.bill-row.has-link .expand-icon {
    opacity: 1; /* Always visible if there is a link */
    color: var(--accent-1);
}

.bill-row.expanded .expand-icon {
    /* Remove rotation for the document icon */
    transform: none; 
    color: var(--accent-1);
    opacity: 1;
}

.bill-row-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.bill-row-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
    width: 100%;
    max-width: 0;
    margin: 0.6rem auto 0;
    transition: max-width 0.5s ease, opacity 0.3s ease;
    opacity: 0;
}

.bill-row.expanded .bill-row-divider {
    max-width: 100%;
    opacity: 1;
}

.bill-row-details {
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(-10px);
}

.bill-row.expanded .bill-row-details {
    max-height: 100px;
    opacity: 1;
    margin-top: 0.8rem;
    padding-bottom: 0.2rem;
    transform: translateY(0);
}

.details-inner {
    display: flex;
    justify-content: center;
    padding: 0.5rem 0;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(45deg, var(--accent-1), #ff5e84);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(255, 51, 102, 0.3);
    transition: all 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 51, 102, 0.5);
    filter: brightness(1.1);
}

.download-btn:active {
    transform: translateY(0) scale(0.96);
    filter: brightness(0.9);
}

.download-btn .flat-icon {
    stroke: currentColor;
    transition: transform 0.3s ease;
}

.download-btn:hover .flat-icon {
    transform: translateY(2px);
}

.row-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.3rem;
}

.status-badge {
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-paid {
    background: rgba(32, 227, 178, 0.1);
    color: var(--accent-2);
    border: 1px solid rgba(32, 227, 178, 0.2);
}

.status-pending {
    background: rgba(255, 51, 102, 0.1);
    color: var(--accent-1);
    border: 1px solid rgba(255, 51, 102, 0.2);
}

/* Status Colors for Values */
.bill-row.paid-row .row-value {
    color: #10b981 !important; /* Green */
}

.bill-row.unpaid-row .row-value {
    color: #ef4444 !important; /* Red */
}

.bill-row.na-row .row-value,
.bill-row.na-row .row-label {
    color: #64748b !important; /* Gray */
}

.row-label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1rem;
    color: #cbd5e1;
}

.row-label .icon {
    font-style: normal;
    font-size: 1.2rem;
    opacity: 0.8;
}

.row-value {
    font-family: monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
}

@media(max-width: 600px) {
    .bill-panel {
        padding: 2rem 1.5rem;
    }
    .total-amount {
        font-size: 2.2rem;
    }
}



/* Spinner */
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--glass-border);
    border-top-color: var(--accent-2);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 3rem auto;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Month Navigator --- */
.month-navigator {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 auto 2rem;
    width: 95%;
    max-width: 600px;
    padding: 1rem 1.5rem;
}

#current-month-display {
    font-size: 1.8rem;
    font-weight: 800;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: linear-gradient(45deg, #fff, #a0aab2);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    font-size: 1.5rem;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.nav-btn:hover:not(:disabled) {
    background: var(--accent-1);
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(255, 51, 102, 0.4);
}

.nav-btn:active:not(:disabled) {
    transform: scale(0.9);
    background: var(--accent-2);
}

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

@media(max-width: 600px) {
    #current-month-display {
        font-size: 1.4rem;
    }
    
    .total-amount {
        font-size: 2rem;
    }
    
    .total-amount small {
        font-size: 1rem;
    }
}

.clickable-panel {
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.clickable-panel:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    border-color: var(--glass-border);
}

.clickable-panel:active {
    transform: scale(0.99);
}

.history-collapsed {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

#depozit-history:not(.history-collapsed) {
    max-height: 2000px; /* Large enough for long histories */
    opacity: 1;
    margin-top: 1rem;
}